Doc AWS SDK 예제 GitHub 리포지토리에서 더 많은 SDK 예제를 사용할 수 있습니다. [AWS](https://github.com/awsdocs/aws-doc-sdk-examples) 

기계 번역으로 제공되는 번역입니다. 제공된 번역과 원본 영어의 내용이 상충하는 경우에는 영어 버전이 우선합니다.

# SDK for Go V2용 코드 예제
<a name="go_2_code_examples"></a>

다음 코드 예제에서는와 함께 AWS SDK for Go V2를 사용하는 방법을 보여줍니다 AWS.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

일부 서비스에는 서비스와 관련된 라이브러리 또는 함수를 활용하는 방법을 보여주는 추가 예제 범주가 포함되어 있습니다.

**추가 리소스**
+  ** [ SDK for Go V2 개발자 안내서 ](https://aws.github.io/aws-sdk-go-v2/docs/) ** - Go with 사용에 대한 자세한 내용입니다 AWS.
+  ** [AWS 개발자 센터 ](https://aws.amazon.com/developer/code-examples/?awsf.sdk-code-examples-programming-language=programming-language%23go) ** – 카테고리별 또는 전체 텍스트 검색별로 필터링할 수 있는 코드 예제입니다.
+  ** [AWS SDK 예제](https://github.com/awsdocs/aws-doc-sdk-examples) ** – 원하는 언어로 작성된 전체 코드가 포함된 GitHub 리포지토리입니다. 코드 설정 및 실행을 위한 지침이 포함되어 있습니다.

**Topics**
+ [API Gateway](go_2_api-gateway_code_examples.md)
+ [Aurora](go_2_aurora_code_examples.md)
+ [Amazon Bedrock](go_2_bedrock_code_examples.md)
+ [Amazon Bedrock 런타임](go_2_bedrock-runtime_code_examples.md)
+ [CloudFormation](go_2_cloudformation_code_examples.md)
+ [CloudWatch Logs](go_2_cloudwatch-logs_code_examples.md)
+ [Amazon Cognito 자격 증명 공급자](go_2_cognito-identity-provider_code_examples.md)
+ [Amazon DocumentDB](go_2_docdb_code_examples.md)
+ [DynamoDB](go_2_dynamodb_code_examples.md)
+ [IAM](go_2_iam_code_examples.md)
+ [Kinesis](go_2_kinesis_code_examples.md)
+ [Lambda](go_2_lambda_code_examples.md)
+ [Amazon MSK](go_2_kafka_code_examples.md)
+ [Partner Central](go_2_partnercentral-selling_code_examples.md)
+ [Amazon RDS](go_2_rds_code_examples.md)
+ [Amazon Redshift](go_2_redshift_code_examples.md)
+ [Amazon S3](go_2_s3_code_examples.md)
+ [Amazon SNS](go_2_sns_code_examples.md)
+ [Amazon SQS](go_2_sqs_code_examples.md)

# SDK for Go V2를 사용한 API Gateway 예제
<a name="go_2_api-gateway_code_examples"></a>

다음 코드 예제에서는 API Gateway와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*AWS 커뮤니티 기여*는 여러 팀이 생성하고 유지 관리하는 예입니다 AWS. 피드백을 제공하려면 연결된 리포지토리에 제공된 메커니즘을 사용합니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [AWS 커뮤니티 기여](#aws_community_contributions)

## AWS 커뮤니티 기여
<a name="aws_community_contributions"></a>

### 서버리스 애플리케이션 빌드 및 테스트
<a name="tributary-lite_serverless-application_go_2_topic"></a>

다음 코드 예제에서는 Lambda 및 DynamoDB와 함께 API 게이트웨이를 사용하여 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.

**SDK for Go V2**  
 Go SDK를 사용하여 Lambda 및 DynamoDB가 포함된 API 게이트웨이로 구성된 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.  
 전체 소스 코드와 설정 및 실행 방법에 대한 지침은 [GitHub](https://github.com/aws-samples/serverless-go-demo)에서 전체 예제를 참조하세요.  

**이 예제에서 사용되는 서비스**
+ API Gateway
+ DynamoDB
+ Lambda

# SDK for Go V2를 사용한 Aurora 예제
<a name="go_2_aurora_code_examples"></a>

다음 코드 예제에서는 Aurora와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)

## 시작하기
<a name="get_started"></a>

### Hello Aurora
<a name="aurora_Hello_go_2_topic"></a>

다음 코드 예제에서는 Aurora를 사용하여 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/rds"
)

// main uses the AWS SDK for Go V2 to create an Amazon Aurora client and list up to 20
// DB clusters in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	auroraClient := rds.NewFromConfig(sdkConfig)
	const maxClusters = 20
	fmt.Printf("Let's list up to %v DB clusters.\n", maxClusters)
	output, err := auroraClient.DescribeDBClusters(
		ctx, &rds.DescribeDBClustersInput{MaxRecords: aws.Int32(maxClusters)})
	if err != nil {
		fmt.Printf("Couldn't list DB clusters: %v\n", err)
		return
	}
	if len(output.DBClusters) == 0 {
		fmt.Println("No DB clusters found.")
	} else {
		for _, cluster := range output.DBClusters {
			fmt.Printf("DB cluster %v has database %v.\n", *cluster.DBClusterIdentifier,
				*cluster.DatabaseName)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusters)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="aurora_Scenario_GetStartedClusters_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 사용자 지정 Aurora DB 클러스터 파라미터 그룹을 만들고 파라미터 값을 설정합니다.
+ 파라미터 그룹을 사용하는 DB 클러스터를 생성합니다.
+ 데이터베이스가 포함된 DB 인스턴스를 생성합니다.
+ DB 클러스터의 스냅샷을 만든 다음, 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"aurora/actions"
	"context"
	"fmt"
	"log"
	"slices"
	"sort"
	"strconv"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/google/uuid"
)

// GetStartedClusters is an interactive example that shows you how to use the AWS SDK for Go
// with Amazon Aurora to do the following:
//
// 1. Create a custom DB cluster parameter group and set parameter values.
// 2. Create an Aurora DB cluster that is configured to use the parameter group.
// 3. Create a DB instance in the DB cluster that contains a database.
// 4. Take a snapshot of the DB cluster.
// 5. Delete the DB instance, DB cluster, and parameter group.
type GetStartedClusters struct {
	sdkConfig  aws.Config
	dbClusters actions.DbClusters
	questioner demotools.IQuestioner
	helper     IScenarioHelper
	isTestRun  bool
}

// NewGetStartedClusters constructs a GetStartedClusters instance from a configuration.
// It uses the specified config to get an Amazon Relational Database Service (Amazon RDS)
// client and create wrappers for the actions used in the scenario.
func NewGetStartedClusters(sdkConfig aws.Config, questioner demotools.IQuestioner,
	helper IScenarioHelper) GetStartedClusters {
	auroraClient := rds.NewFromConfig(sdkConfig)
	return GetStartedClusters{
		sdkConfig:  sdkConfig,
		dbClusters: actions.DbClusters{AuroraClient: auroraClient},
		questioner: questioner,
		helper:     helper,
	}
}

// Run runs the interactive scenario.
func (scenario GetStartedClusters) Run(ctx context.Context, dbEngine string, parameterGroupName string,
	clusterName string, dbName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon Aurora DB Cluster demo.")
	log.Println(strings.Repeat("-", 88))

	parameterGroup := scenario.CreateParameterGroup(ctx, dbEngine, parameterGroupName)
	scenario.SetUserParameters(ctx, parameterGroupName)
	cluster := scenario.CreateCluster(ctx, clusterName, dbEngine, dbName, parameterGroup)
	scenario.helper.Pause(5)
	dbInstance := scenario.CreateInstance(ctx, cluster)
	scenario.DisplayConnection(cluster)
	scenario.CreateSnapshot(ctx, clusterName)
	scenario.Cleanup(ctx, dbInstance, cluster, parameterGroup)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}

// CreateParameterGroup shows how to get available engine versions for a specified
// database engine and create a DB cluster parameter group that is compatible with a
// selected engine family.
func (scenario GetStartedClusters) CreateParameterGroup(ctx context.Context, dbEngine string,
	parameterGroupName string) *types.DBClusterParameterGroup {

	log.Printf("Checking for an existing DB cluster parameter group named %v.\n",
		parameterGroupName)
	parameterGroup, err := scenario.dbClusters.GetParameterGroup(ctx, parameterGroupName)
	if err != nil {
		panic(err)
	}
	if parameterGroup == nil {
		log.Printf("Getting available database engine versions for %v.\n", dbEngine)
		engineVersions, err := scenario.dbClusters.GetEngineVersions(ctx, dbEngine, "")
		if err != nil {
			panic(err)
		}

		familySet := map[string]struct{}{}
		for _, family := range engineVersions {
			familySet[*family.DBParameterGroupFamily] = struct{}{}
		}
		var families []string
		for family := range familySet {
			families = append(families, family)
		}
		sort.Strings(families)
		familyIndex := scenario.questioner.AskChoice("Which family do you want to use?\n", families)
		log.Println("Creating a DB cluster parameter group.")
		_, err = scenario.dbClusters.CreateParameterGroup(
			ctx, parameterGroupName, families[familyIndex], "Example parameter group.")
		if err != nil {
			panic(err)
		}
		parameterGroup, err = scenario.dbClusters.GetParameterGroup(ctx, parameterGroupName)
		if err != nil {
			panic(err)
		}
	}
	log.Printf("Parameter group %v:\n", *parameterGroup.DBParameterGroupFamily)
	log.Printf("\tName: %v\n", *parameterGroup.DBClusterParameterGroupName)
	log.Printf("\tARN: %v\n", *parameterGroup.DBClusterParameterGroupArn)
	log.Printf("\tFamily: %v\n", *parameterGroup.DBParameterGroupFamily)
	log.Printf("\tDescription: %v\n", *parameterGroup.Description)
	log.Println(strings.Repeat("-", 88))
	return parameterGroup

}

// SetUserParameters shows how to get the parameters contained in a custom parameter
// group and update some of the parameter values in the group.
func (scenario GetStartedClusters) SetUserParameters(ctx context.Context, parameterGroupName string) {
	log.Println("Let's set some parameter values in your parameter group.")
	dbParameters, err := scenario.dbClusters.GetParameters(ctx, parameterGroupName, "")
	if err != nil {
		panic(err)
	}
	var updateParams []types.Parameter
	for _, dbParam := range dbParameters {
		if strings.HasPrefix(*dbParam.ParameterName, "auto_increment") &&
			*dbParam.IsModifiable && *dbParam.DataType == "integer" {
			log.Printf("The %v parameter is described as:\n\t%v",
				*dbParam.ParameterName, *dbParam.Description)
			rangeSplit := strings.Split(*dbParam.AllowedValues, "-")
			lower, _ := strconv.Atoi(rangeSplit[0])
			upper, _ := strconv.Atoi(rangeSplit[1])
			newValue := scenario.questioner.AskInt(
				fmt.Sprintf("Enter a value between %v and %v:", lower, upper),
				demotools.InIntRange{Lower: lower, Upper: upper})
			dbParam.ParameterValue = aws.String(strconv.Itoa(newValue))
			updateParams = append(updateParams, dbParam)
		}
	}
	err = scenario.dbClusters.UpdateParameters(ctx, parameterGroupName, updateParams)
	if err != nil {
		panic(err)
	}
	log.Println("You can get a list of parameters you've set by specifying a source of 'user'.")
	userParameters, err := scenario.dbClusters.GetParameters(ctx, parameterGroupName, "user")
	if err != nil {
		panic(err)
	}
	log.Println("Here are the parameters you've set:")
	for _, param := range userParameters {
		log.Printf("\t%v: %v\n", *param.ParameterName, *param.ParameterValue)
	}
	log.Println(strings.Repeat("-", 88))
}

// CreateCluster shows how to create an Aurora DB cluster that contains a database
// of a specified type. The database is also configured to use a custom DB cluster
// parameter group.
func (scenario GetStartedClusters) CreateCluster(ctx context.Context, clusterName string, dbEngine string,
	dbName string, parameterGroup *types.DBClusterParameterGroup) *types.DBCluster {

	log.Println("Checking for an existing DB cluster.")
	cluster, err := scenario.dbClusters.GetDbCluster(ctx, clusterName)
	if err != nil {
		panic(err)
	}
	if cluster == nil {
		adminUsername := scenario.questioner.Ask(
			"Enter an administrator user name for the database: ", demotools.NotEmpty{})
		adminPassword := scenario.questioner.Ask(
			"Enter a password for the administrator (at least 8 characters): ", demotools.NotEmpty{})
		engineVersions, err := scenario.dbClusters.GetEngineVersions(ctx, dbEngine, *parameterGroup.DBParameterGroupFamily)
		if err != nil {
			panic(err)
		}
		var engineChoices []string
		for _, engine := range engineVersions {
			engineChoices = append(engineChoices, *engine.EngineVersion)
		}
		log.Println("The available engines for your parameter group are:")
		engineIndex := scenario.questioner.AskChoice("Which engine do you want to use?\n", engineChoices)
		log.Printf("Creating DB cluster %v and database %v.\n", clusterName, dbName)
		log.Printf("The DB cluster is configured to use\nyour custom parameter group %v\n",
			*parameterGroup.DBClusterParameterGroupName)
		log.Printf("and selected engine %v.\n", engineChoices[engineIndex])
		log.Println("This typically takes several minutes.")
		cluster, err = scenario.dbClusters.CreateDbCluster(
			ctx, clusterName, *parameterGroup.DBClusterParameterGroupName, dbName, dbEngine,
			engineChoices[engineIndex], adminUsername, adminPassword)
		if err != nil {
			panic(err)
		}
		for *cluster.Status != "available" {
			scenario.helper.Pause(30)
			cluster, err = scenario.dbClusters.GetDbCluster(ctx, clusterName)
			if err != nil {
				panic(err)
			}
			log.Println("Cluster created and available.")
		}
	}
	log.Println("Cluster data:")
	log.Printf("\tDBClusterIdentifier: %v\n", *cluster.DBClusterIdentifier)
	log.Printf("\tARN: %v\n", *cluster.DBClusterArn)
	log.Printf("\tStatus: %v\n", *cluster.Status)
	log.Printf("\tEngine: %v\n", *cluster.Engine)
	log.Printf("\tEngine version: %v\n", *cluster.EngineVersion)
	log.Printf("\tDBClusterParameterGroup: %v\n", *cluster.DBClusterParameterGroup)
	log.Printf("\tEngineMode: %v\n", *cluster.EngineMode)
	log.Println(strings.Repeat("-", 88))
	return cluster
}

// CreateInstance shows how to create a DB instance in an existing Aurora DB cluster.
// A new DB cluster contains no DB instances, so you must add one. The first DB instance
// that is added to a DB cluster defaults to a read-write DB instance.
func (scenario GetStartedClusters) CreateInstance(ctx context.Context, cluster *types.DBCluster) *types.DBInstance {
	log.Println("Checking for an existing database instance.")
	dbInstance, err := scenario.dbClusters.GetInstance(ctx, *cluster.DBClusterIdentifier)
	if err != nil {
		panic(err)
	}
	if dbInstance == nil {
		log.Println("Let's create a database instance in your DB cluster.")
		log.Println("First, choose a DB instance type:")
		instOpts, err := scenario.dbClusters.GetOrderableInstances(
			ctx, *cluster.Engine, *cluster.EngineVersion)
		if err != nil {
			panic(err)
		}
		var instChoices []string
		for _, opt := range instOpts {
			instChoices = append(instChoices, *opt.DBInstanceClass)
		}
		slices.Sort(instChoices)
		instChoices = slices.Compact(instChoices)
		instIndex := scenario.questioner.AskChoice(
			"Which DB instance class do you want to use?\n", instChoices)
		log.Println("Creating a database instance. This typically takes several minutes.")
		dbInstance, err = scenario.dbClusters.CreateInstanceInCluster(
			ctx, *cluster.DBClusterIdentifier, *cluster.DBClusterIdentifier, *cluster.Engine,
			instChoices[instIndex])
		if err != nil {
			panic(err)
		}
		for *dbInstance.DBInstanceStatus != "available" {
			scenario.helper.Pause(30)
			dbInstance, err = scenario.dbClusters.GetInstance(ctx, *cluster.DBClusterIdentifier)
			if err != nil {
				panic(err)
			}
		}
	}
	log.Println("Instance data:")
	log.Printf("\tDBInstanceIdentifier: %v\n", *dbInstance.DBInstanceIdentifier)
	log.Printf("\tARN: %v\n", *dbInstance.DBInstanceArn)
	log.Printf("\tStatus: %v\n", *dbInstance.DBInstanceStatus)
	log.Printf("\tEngine: %v\n", *dbInstance.Engine)
	log.Printf("\tEngine version: %v\n", *dbInstance.EngineVersion)
	log.Println(strings.Repeat("-", 88))
	return dbInstance
}

// DisplayConnection displays connection information about an Aurora DB cluster and tips
// on how to connect to it.
func (scenario GetStartedClusters) DisplayConnection(cluster *types.DBCluster) {
	log.Println(
		"You can now connect to your database using your favorite MySql client.\n" +
			"One way to connect is by using the 'mysql' shell on an Amazon EC2 instance\n" +
			"that is running in the same VPC as your database cluster. Pass the endpoint,\n" +
			"port, and administrator user name to 'mysql' and enter your password\n" +
			"when prompted:")
	log.Printf("\n\tmysql -h %v -P %v -u %v -p\n",
		*cluster.Endpoint, *cluster.Port, *cluster.MasterUsername)
	log.Println("For more information, see the User Guide for Aurora:\n" +
		"\thttps://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/CHAP_GettingStartedAurora.CreatingConnecting.Aurora.html#CHAP_GettingStartedAurora.Aurora.Connect")
	log.Println(strings.Repeat("-", 88))
}

// CreateSnapshot shows how to create a DB cluster snapshot and wait until it's available.
func (scenario GetStartedClusters) CreateSnapshot(ctx context.Context, clusterName string) {
	if scenario.questioner.AskBool(
		"Do you want to create a snapshot of your DB cluster (y/n)? ", "y") {
		snapshotId := fmt.Sprintf("%v-%v", clusterName, scenario.helper.UniqueId())
		log.Printf("Creating a snapshot named %v. This typically takes a few minutes.\n", snapshotId)
		snapshot, err := scenario.dbClusters.CreateClusterSnapshot(ctx, clusterName, snapshotId)
		if err != nil {
			panic(err)
		}
		for *snapshot.Status != "available" {
			scenario.helper.Pause(30)
			snapshot, err = scenario.dbClusters.GetClusterSnapshot(ctx, snapshotId)
			if err != nil {
				panic(err)
			}
		}
		log.Println("Snapshot data:")
		log.Printf("\tDBClusterSnapshotIdentifier: %v\n", *snapshot.DBClusterSnapshotIdentifier)
		log.Printf("\tARN: %v\n", *snapshot.DBClusterSnapshotArn)
		log.Printf("\tStatus: %v\n", *snapshot.Status)
		log.Printf("\tEngine: %v\n", *snapshot.Engine)
		log.Printf("\tEngine version: %v\n", *snapshot.EngineVersion)
		log.Printf("\tDBClusterIdentifier: %v\n", *snapshot.DBClusterIdentifier)
		log.Printf("\tSnapshotCreateTime: %v\n", *snapshot.SnapshotCreateTime)
		log.Println(strings.Repeat("-", 88))
	}
}

// Cleanup shows how to clean up a DB instance, DB cluster, and DB cluster parameter group.
// Before the DB cluster parameter group can be deleted, all associated DB instances and
// DB clusters must first be deleted.
func (scenario GetStartedClusters) Cleanup(ctx context.Context, dbInstance *types.DBInstance, cluster *types.DBCluster,
	parameterGroup *types.DBClusterParameterGroup) {

	if scenario.questioner.AskBool(
		"\nDo you want to delete the database instance, DB cluster, and parameter group (y/n)? ", "y") {
		log.Printf("Deleting database instance %v.\n", *dbInstance.DBInstanceIdentifier)
		err := scenario.dbClusters.DeleteInstance(ctx, *dbInstance.DBInstanceIdentifier)
		if err != nil {
			panic(err)
		}
		log.Printf("Deleting database cluster %v.\n", *cluster.DBClusterIdentifier)
		err = scenario.dbClusters.DeleteDbCluster(ctx, *cluster.DBClusterIdentifier)
		if err != nil {
			panic(err)
		}
		log.Println(
			"Waiting for the DB instance and DB cluster to delete. This typically takes several minutes.")
		for dbInstance != nil || cluster != nil {
			scenario.helper.Pause(30)
			if dbInstance != nil {
				dbInstance, err = scenario.dbClusters.GetInstance(ctx, *dbInstance.DBInstanceIdentifier)
				if err != nil {
					panic(err)
				}
			}
			if cluster != nil {
				cluster, err = scenario.dbClusters.GetDbCluster(ctx, *cluster.DBClusterIdentifier)
				if err != nil {
					panic(err)
				}
			}
		}
		log.Printf("Deleting parameter group %v.", *parameterGroup.DBClusterParameterGroupName)
		err = scenario.dbClusters.DeleteParameterGroup(ctx, *parameterGroup.DBClusterParameterGroupName)
		if err != nil {
			panic(err)
		}
	}
}

// IScenarioHelper abstracts the function from a scenario so that it
// can be mocked for unit testing.
type IScenarioHelper interface {
	Pause(secs int)
	UniqueId() string
}
type ScenarioHelper struct{}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	time.Sleep(time.Duration(secs) * time.Second)
}

// UniqueId returns a new UUID.
func (helper ScenarioHelper) UniqueId() string {
	return uuid.New().String()
}
```
Aurora 작업을 관리하기 위해 시나리오가 호출하는 함수를 정의합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}


// GetParameterGroup gets a DB cluster parameter group by name.
func (clusters *DbClusters) GetParameterGroup(ctx context.Context, parameterGroupName string) (
	*types.DBClusterParameterGroup, error) {
	output, err := clusters.AuroraClient.DescribeDBClusterParameterGroups(
		ctx, &rds.DescribeDBClusterParameterGroupsInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		var notFoundError *types.DBParameterGroupNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("Parameter group %v does not exist.\n", parameterGroupName)
			err = nil
		} else {
			log.Printf("Error getting parameter group %v: %v\n", parameterGroupName, err)
		}
		return nil, err
	} else {
		return &output.DBClusterParameterGroups[0], err
	}
}


// CreateParameterGroup creates a DB cluster parameter group that is based on the specified
// parameter group family.
func (clusters *DbClusters) CreateParameterGroup(
	ctx context.Context, parameterGroupName string, parameterGroupFamily string, description string) (
	*types.DBClusterParameterGroup, error) {

	output, err := clusters.AuroraClient.CreateDBClusterParameterGroup(ctx,
		&rds.CreateDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			DBParameterGroupFamily:      aws.String(parameterGroupFamily),
			Description:                 aws.String(description),
		})
	if err != nil {
		log.Printf("Couldn't create parameter group %v: %v\n", parameterGroupName, err)
		return nil, err
	} else {
		return output.DBClusterParameterGroup, err
	}
}



// DeleteParameterGroup deletes the named DB cluster parameter group.
func (clusters *DbClusters) DeleteParameterGroup(ctx context.Context, parameterGroupName string) error {
	_, err := clusters.AuroraClient.DeleteDBClusterParameterGroup(ctx,
		&rds.DeleteDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		log.Printf("Couldn't delete parameter group %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}



// GetParameters gets the parameters that are contained in a DB cluster parameter group.
func (clusters *DbClusters) GetParameters(ctx context.Context, parameterGroupName string, source string) (
	[]types.Parameter, error) {

	var output *rds.DescribeDBClusterParametersOutput
	var params []types.Parameter
	var err error
	parameterPaginator := rds.NewDescribeDBClusterParametersPaginator(clusters.AuroraClient,
		&rds.DescribeDBClusterParametersInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			Source:                      aws.String(source),
		})
	for parameterPaginator.HasMorePages() {
		output, err = parameterPaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get paramaeters for %v: %v\n", parameterGroupName, err)
			break
		} else {
			params = append(params, output.Parameters...)
		}
	}
	return params, err
}



// UpdateParameters updates parameters in a named DB cluster parameter group.
func (clusters *DbClusters) UpdateParameters(ctx context.Context, parameterGroupName string, params []types.Parameter) error {
	_, err := clusters.AuroraClient.ModifyDBClusterParameterGroup(ctx,
		&rds.ModifyDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			Parameters:                  params,
		})
	if err != nil {
		log.Printf("Couldn't update parameters in %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}



// GetDbCluster gets data about an Aurora DB cluster.
func (clusters *DbClusters) GetDbCluster(ctx context.Context, clusterName string) (*types.DBCluster, error) {
	output, err := clusters.AuroraClient.DescribeDBClusters(ctx,
		&rds.DescribeDBClustersInput{
			DBClusterIdentifier: aws.String(clusterName),
		})
	if err != nil {
		var notFoundError *types.DBClusterNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB cluster %v does not exist.\n", clusterName)
			err = nil
		} else {
			log.Printf("Couldn't get DB cluster %v: %v\n", clusterName, err)
		}
		return nil, err
	} else {
		return &output.DBClusters[0], err
	}
}



// CreateDbCluster creates a DB cluster that is configured to use the specified parameter group.
// The newly created DB cluster contains a database that uses the specified engine and
// engine version.
func (clusters *DbClusters) CreateDbCluster(ctx context.Context, clusterName string, parameterGroupName string,
	dbName string, dbEngine string, dbEngineVersion string, adminName string, adminPassword string) (
	*types.DBCluster, error) {

	output, err := clusters.AuroraClient.CreateDBCluster(ctx, &rds.CreateDBClusterInput{
		DBClusterIdentifier:         aws.String(clusterName),
		Engine:                      aws.String(dbEngine),
		DBClusterParameterGroupName: aws.String(parameterGroupName),
		DatabaseName:                aws.String(dbName),
		EngineVersion:               aws.String(dbEngineVersion),
		MasterUserPassword:          aws.String(adminPassword),
		MasterUsername:              aws.String(adminName),
	})
	if err != nil {
		log.Printf("Couldn't create DB cluster %v: %v\n", clusterName, err)
		return nil, err
	} else {
		return output.DBCluster, err
	}
}



// DeleteDbCluster deletes a DB cluster without keeping a final snapshot.
func (clusters *DbClusters) DeleteDbCluster(ctx context.Context, clusterName string) error {
	_, err := clusters.AuroraClient.DeleteDBCluster(ctx, &rds.DeleteDBClusterInput{
		DBClusterIdentifier: aws.String(clusterName),
		SkipFinalSnapshot:   aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete DB cluster %v: %v\n", clusterName, err)
		return err
	} else {
		return nil
	}
}



// CreateClusterSnapshot creates a snapshot of a DB cluster.
func (clusters *DbClusters) CreateClusterSnapshot(ctx context.Context, clusterName string, snapshotName string) (
	*types.DBClusterSnapshot, error) {
	output, err := clusters.AuroraClient.CreateDBClusterSnapshot(ctx, &rds.CreateDBClusterSnapshotInput{
		DBClusterIdentifier:         aws.String(clusterName),
		DBClusterSnapshotIdentifier: aws.String(snapshotName),
	})
	if err != nil {
		log.Printf("Couldn't create snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return output.DBClusterSnapshot, nil
	}
}



// GetClusterSnapshot gets a DB cluster snapshot.
func (clusters *DbClusters) GetClusterSnapshot(ctx context.Context, snapshotName string) (*types.DBClusterSnapshot, error) {
	output, err := clusters.AuroraClient.DescribeDBClusterSnapshots(ctx,
		&rds.DescribeDBClusterSnapshotsInput{
			DBClusterSnapshotIdentifier: aws.String(snapshotName),
		})
	if err != nil {
		log.Printf("Couldn't get snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return &output.DBClusterSnapshots[0], nil
	}
}



// CreateInstanceInCluster creates a database instance in an existing DB cluster. The first database that is
// created defaults to a read-write DB instance.
func (clusters *DbClusters) CreateInstanceInCluster(ctx context.Context, clusterName string, instanceName string,
	dbEngine string, dbInstanceClass string) (*types.DBInstance, error) {
	output, err := clusters.AuroraClient.CreateDBInstance(ctx, &rds.CreateDBInstanceInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBClusterIdentifier:  aws.String(clusterName),
		Engine:               aws.String(dbEngine),
		DBInstanceClass:      aws.String(dbInstanceClass),
	})
	if err != nil {
		log.Printf("Couldn't create instance %v: %v\n", instanceName, err)
		return nil, err
	} else {
		return output.DBInstance, nil
	}
}



// GetInstance gets data about a DB instance.
func (clusters *DbClusters) GetInstance(ctx context.Context, instanceName string) (
	*types.DBInstance, error) {
	output, err := clusters.AuroraClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{
			DBInstanceIdentifier: aws.String(instanceName),
		})
	if err != nil {
		var notFoundError *types.DBInstanceNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB instance %v does not exist.\n", instanceName)
			err = nil
		} else {
			log.Printf("Couldn't get instance %v: %v\n", instanceName, err)
		}
		return nil, err
	} else {
		return &output.DBInstances[0], nil
	}
}



// DeleteInstance deletes a DB instance.
func (clusters *DbClusters) DeleteInstance(ctx context.Context, instanceName string) error {
	_, err := clusters.AuroraClient.DeleteDBInstance(ctx, &rds.DeleteDBInstanceInput{
		DBInstanceIdentifier:   aws.String(instanceName),
		SkipFinalSnapshot:      aws.Bool(true),
		DeleteAutomatedBackups: aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete instance %v: %v\n", instanceName, err)
		return err
	} else {
		return nil
	}
}



// GetEngineVersions gets database engine versions that are available for the specified engine
// and parameter group family.
func (clusters *DbClusters) GetEngineVersions(ctx context.Context, engine string, parameterGroupFamily string) (
	[]types.DBEngineVersion, error) {
	output, err := clusters.AuroraClient.DescribeDBEngineVersions(ctx,
		&rds.DescribeDBEngineVersionsInput{
			Engine:                 aws.String(engine),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
		})
	if err != nil {
		log.Printf("Couldn't get engine versions for %v: %v\n", engine, err)
		return nil, err
	} else {
		return output.DBEngineVersions, nil
	}
}



// GetOrderableInstances uses a paginator to get DB instance options that can be used to create DB instances that are
// compatible with a set of specifications.
func (clusters *DbClusters) GetOrderableInstances(ctx context.Context, engine string, engineVersion string) (
	[]types.OrderableDBInstanceOption, error) {

	var output *rds.DescribeOrderableDBInstanceOptionsOutput
	var instances []types.OrderableDBInstanceOption
	var err error
	orderablePaginator := rds.NewDescribeOrderableDBInstanceOptionsPaginator(clusters.AuroraClient,
		&rds.DescribeOrderableDBInstanceOptionsInput{
			Engine:        aws.String(engine),
			EngineVersion: aws.String(engineVersion),
		})
	for orderablePaginator.HasMorePages() {
		output, err = orderablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get orderable DB instances: %v\n", err)
			break
		} else {
			instances = append(instances, output.OrderableDBInstanceOptions...)
		}
	}
	return instances, err
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 항목을 참조하세요.
  + [CreateDBCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBCluster)
  + [CreateDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBClusterParameterGroup)
  + [CreateDBClusterSnapshot](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBClusterSnapshot)
  + [CreateDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBInstance)
  + [DeleteDBCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBCluster)
  + [DeleteDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBClusterParameterGroup)
  + [DeleteDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBInstance)
  + [DescribeDBClusterParameterGroups](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterParameterGroups)
  + [DescribeDBClusterParameters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterParameters)
  + [DescribeDBClusterSnapshots](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterSnapshots)
  + [DescribeDBClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusters)
  + [DescribeDBEngineVersions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBEngineVersions)
  + [DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)
  + [DescribeOrderableDBInstanceOptions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeOrderableDBInstanceOptions)
  + [ModifyDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.ModifyDBClusterParameterGroup)

## 작업
<a name="actions"></a>

### `CreateDBCluster`
<a name="aurora_CreateDBCluster_go_2_topic"></a>

다음 코드 예시는 `CreateDBCluster`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// CreateDbCluster creates a DB cluster that is configured to use the specified parameter group.
// The newly created DB cluster contains a database that uses the specified engine and
// engine version.
func (clusters *DbClusters) CreateDbCluster(ctx context.Context, clusterName string, parameterGroupName string,
	dbName string, dbEngine string, dbEngineVersion string, adminName string, adminPassword string) (
	*types.DBCluster, error) {

	output, err := clusters.AuroraClient.CreateDBCluster(ctx, &rds.CreateDBClusterInput{
		DBClusterIdentifier:         aws.String(clusterName),
		Engine:                      aws.String(dbEngine),
		DBClusterParameterGroupName: aws.String(parameterGroupName),
		DatabaseName:                aws.String(dbName),
		EngineVersion:               aws.String(dbEngineVersion),
		MasterUserPassword:          aws.String(adminPassword),
		MasterUsername:              aws.String(adminName),
	})
	if err != nil {
		log.Printf("Couldn't create DB cluster %v: %v\n", clusterName, err)
		return nil, err
	} else {
		return output.DBCluster, err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBCluster)를 참조하세요.

### `CreateDBClusterParameterGroup`
<a name="aurora_CreateDBClusterParameterGroup_go_2_topic"></a>

다음 코드 예시는 `CreateDBClusterParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// CreateParameterGroup creates a DB cluster parameter group that is based on the specified
// parameter group family.
func (clusters *DbClusters) CreateParameterGroup(
	ctx context.Context, parameterGroupName string, parameterGroupFamily string, description string) (
	*types.DBClusterParameterGroup, error) {

	output, err := clusters.AuroraClient.CreateDBClusterParameterGroup(ctx,
		&rds.CreateDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			DBParameterGroupFamily:      aws.String(parameterGroupFamily),
			Description:                 aws.String(description),
		})
	if err != nil {
		log.Printf("Couldn't create parameter group %v: %v\n", parameterGroupName, err)
		return nil, err
	} else {
		return output.DBClusterParameterGroup, err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go SDK for Rust API 참조*의 [CreateDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBClusterParameterGroup)를 참조하세요.

### `CreateDBClusterSnapshot`
<a name="aurora_CreateDBClusterSnapshot_go_2_topic"></a>

다음 코드 예시는 `CreateDBClusterSnapshot`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// CreateClusterSnapshot creates a snapshot of a DB cluster.
func (clusters *DbClusters) CreateClusterSnapshot(ctx context.Context, clusterName string, snapshotName string) (
	*types.DBClusterSnapshot, error) {
	output, err := clusters.AuroraClient.CreateDBClusterSnapshot(ctx, &rds.CreateDBClusterSnapshotInput{
		DBClusterIdentifier:         aws.String(clusterName),
		DBClusterSnapshotIdentifier: aws.String(snapshotName),
	})
	if err != nil {
		log.Printf("Couldn't create snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return output.DBClusterSnapshot, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBClusterSnapshot](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBClusterSnapshot)을 참조하세요.

### `CreateDBInstance`
<a name="aurora_CreateDBInstance_go_2_topic"></a>

다음 코드 예시는 `CreateDBInstance`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// CreateInstanceInCluster creates a database instance in an existing DB cluster. The first database that is
// created defaults to a read-write DB instance.
func (clusters *DbClusters) CreateInstanceInCluster(ctx context.Context, clusterName string, instanceName string,
	dbEngine string, dbInstanceClass string) (*types.DBInstance, error) {
	output, err := clusters.AuroraClient.CreateDBInstance(ctx, &rds.CreateDBInstanceInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBClusterIdentifier:  aws.String(clusterName),
		Engine:               aws.String(dbEngine),
		DBInstanceClass:      aws.String(dbInstanceClass),
	})
	if err != nil {
		log.Printf("Couldn't create instance %v: %v\n", instanceName, err)
		return nil, err
	} else {
		return output.DBInstance, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBInstance)를 참조하세요.

### `DeleteDBCluster`
<a name="aurora_DeleteDBCluster_go_2_topic"></a>

다음 코드 예시는 `DeleteDBCluster`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// DeleteDbCluster deletes a DB cluster without keeping a final snapshot.
func (clusters *DbClusters) DeleteDbCluster(ctx context.Context, clusterName string) error {
	_, err := clusters.AuroraClient.DeleteDBCluster(ctx, &rds.DeleteDBClusterInput{
		DBClusterIdentifier: aws.String(clusterName),
		SkipFinalSnapshot:   aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete DB cluster %v: %v\n", clusterName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteDBCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBCluster)를 참조하세요.

### `DeleteDBClusterParameterGroup`
<a name="aurora_DeleteDBClusterParameterGroup_go_2_topic"></a>

다음 코드 예시는 `DeleteDBClusterParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// DeleteParameterGroup deletes the named DB cluster parameter group.
func (clusters *DbClusters) DeleteParameterGroup(ctx context.Context, parameterGroupName string) error {
	_, err := clusters.AuroraClient.DeleteDBClusterParameterGroup(ctx,
		&rds.DeleteDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		log.Printf("Couldn't delete parameter group %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBClusterParameterGroup)을 참조하세요.

### `DeleteDBInstance`
<a name="aurora_DeleteDBInstance_go_2_topic"></a>

다음 코드 예시는 `DeleteDBInstance`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// DeleteInstance deletes a DB instance.
func (clusters *DbClusters) DeleteInstance(ctx context.Context, instanceName string) error {
	_, err := clusters.AuroraClient.DeleteDBInstance(ctx, &rds.DeleteDBInstanceInput{
		DBInstanceIdentifier:   aws.String(instanceName),
		SkipFinalSnapshot:      aws.Bool(true),
		DeleteAutomatedBackups: aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete instance %v: %v\n", instanceName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBInstance)를 참조하세요.

### `DescribeDBClusterParameterGroups`
<a name="aurora_DescribeDBClusterParameterGroups_go_2_topic"></a>

다음 코드 예시는 `DescribeDBClusterParameterGroups`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetParameterGroup gets a DB cluster parameter group by name.
func (clusters *DbClusters) GetParameterGroup(ctx context.Context, parameterGroupName string) (
	*types.DBClusterParameterGroup, error) {
	output, err := clusters.AuroraClient.DescribeDBClusterParameterGroups(
		ctx, &rds.DescribeDBClusterParameterGroupsInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		var notFoundError *types.DBParameterGroupNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("Parameter group %v does not exist.\n", parameterGroupName)
			err = nil
		} else {
			log.Printf("Error getting parameter group %v: %v\n", parameterGroupName, err)
		}
		return nil, err
	} else {
		return &output.DBClusterParameterGroups[0], err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBClusterParameterGroups](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterParameterGroups)를 참조하세요.

### `DescribeDBClusterParameters`
<a name="aurora_DescribeDBClusterParameters_go_2_topic"></a>

다음 코드 예시는 `DescribeDBClusterParameters`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetParameters gets the parameters that are contained in a DB cluster parameter group.
func (clusters *DbClusters) GetParameters(ctx context.Context, parameterGroupName string, source string) (
	[]types.Parameter, error) {

	var output *rds.DescribeDBClusterParametersOutput
	var params []types.Parameter
	var err error
	parameterPaginator := rds.NewDescribeDBClusterParametersPaginator(clusters.AuroraClient,
		&rds.DescribeDBClusterParametersInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			Source:                      aws.String(source),
		})
	for parameterPaginator.HasMorePages() {
		output, err = parameterPaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get paramaeters for %v: %v\n", parameterGroupName, err)
			break
		} else {
			params = append(params, output.Parameters...)
		}
	}
	return params, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBClusterParameters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterParameters)를 참조하세요.

### `DescribeDBClusterSnapshots`
<a name="aurora_DescribeDBClusterSnapshots_go_2_topic"></a>

다음 코드 예시는 `DescribeDBClusterSnapshots`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetClusterSnapshot gets a DB cluster snapshot.
func (clusters *DbClusters) GetClusterSnapshot(ctx context.Context, snapshotName string) (*types.DBClusterSnapshot, error) {
	output, err := clusters.AuroraClient.DescribeDBClusterSnapshots(ctx,
		&rds.DescribeDBClusterSnapshotsInput{
			DBClusterSnapshotIdentifier: aws.String(snapshotName),
		})
	if err != nil {
		log.Printf("Couldn't get snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return &output.DBClusterSnapshots[0], nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBClusterSnapshots](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusterSnapshots)를 참조하세요.

### `DescribeDBClusters`
<a name="aurora_DescribeDBClusters_go_2_topic"></a>

다음 코드 예시는 `DescribeDBClusters`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetDbCluster gets data about an Aurora DB cluster.
func (clusters *DbClusters) GetDbCluster(ctx context.Context, clusterName string) (*types.DBCluster, error) {
	output, err := clusters.AuroraClient.DescribeDBClusters(ctx,
		&rds.DescribeDBClustersInput{
			DBClusterIdentifier: aws.String(clusterName),
		})
	if err != nil {
		var notFoundError *types.DBClusterNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB cluster %v does not exist.\n", clusterName)
			err = nil
		} else {
			log.Printf("Couldn't get DB cluster %v: %v\n", clusterName, err)
		}
		return nil, err
	} else {
		return &output.DBClusters[0], err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBClusters)를 참조하세요.

### `DescribeDBEngineVersions`
<a name="aurora_DescribeDBEngineVersions_go_2_topic"></a>

다음 코드 예시는 `DescribeDBEngineVersions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetEngineVersions gets database engine versions that are available for the specified engine
// and parameter group family.
func (clusters *DbClusters) GetEngineVersions(ctx context.Context, engine string, parameterGroupFamily string) (
	[]types.DBEngineVersion, error) {
	output, err := clusters.AuroraClient.DescribeDBEngineVersions(ctx,
		&rds.DescribeDBEngineVersionsInput{
			Engine:                 aws.String(engine),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
		})
	if err != nil {
		log.Printf("Couldn't get engine versions for %v: %v\n", engine, err)
		return nil, err
	} else {
		return output.DBEngineVersions, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBEngineVersions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBEngineVersions)을 참조하세요.

### `DescribeDBInstances`
<a name="aurora_DescribeDBInstances_go_2_topic"></a>

다음 코드 예시는 `DescribeDBInstances`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetInstance gets data about a DB instance.
func (clusters *DbClusters) GetInstance(ctx context.Context, instanceName string) (
	*types.DBInstance, error) {
	output, err := clusters.AuroraClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{
			DBInstanceIdentifier: aws.String(instanceName),
		})
	if err != nil {
		var notFoundError *types.DBInstanceNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB instance %v does not exist.\n", instanceName)
			err = nil
		} else {
			log.Printf("Couldn't get instance %v: %v\n", instanceName, err)
		}
		return nil, err
	} else {
		return &output.DBInstances[0], nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)를 참조하세요.

### `DescribeOrderableDBInstanceOptions`
<a name="aurora_DescribeOrderableDBInstanceOptions_go_2_topic"></a>

다음 코드 예시는 `DescribeOrderableDBInstanceOptions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// GetOrderableInstances uses a paginator to get DB instance options that can be used to create DB instances that are
// compatible with a set of specifications.
func (clusters *DbClusters) GetOrderableInstances(ctx context.Context, engine string, engineVersion string) (
	[]types.OrderableDBInstanceOption, error) {

	var output *rds.DescribeOrderableDBInstanceOptionsOutput
	var instances []types.OrderableDBInstanceOption
	var err error
	orderablePaginator := rds.NewDescribeOrderableDBInstanceOptionsPaginator(clusters.AuroraClient,
		&rds.DescribeOrderableDBInstanceOptionsInput{
			Engine:        aws.String(engine),
			EngineVersion: aws.String(engineVersion),
		})
	for orderablePaginator.HasMorePages() {
		output, err = orderablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get orderable DB instances: %v\n", err)
			break
		} else {
			instances = append(instances, output.OrderableDBInstanceOptions...)
		}
	}
	return instances, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeOrderableDBInstanceOptions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeOrderableDBInstanceOptions)를 참조하세요.

### `ModifyDBClusterParameterGroup`
<a name="aurora_ModifyDBClusterParameterGroup_go_2_topic"></a>

다음 코드 예시는 `ModifyDBClusterParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/aurora#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbClusters struct {
	AuroraClient *rds.Client
}



// UpdateParameters updates parameters in a named DB cluster parameter group.
func (clusters *DbClusters) UpdateParameters(ctx context.Context, parameterGroupName string, params []types.Parameter) error {
	_, err := clusters.AuroraClient.ModifyDBClusterParameterGroup(ctx,
		&rds.ModifyDBClusterParameterGroupInput{
			DBClusterParameterGroupName: aws.String(parameterGroupName),
			Parameters:                  params,
		})
	if err != nil {
		log.Printf("Couldn't update parameters in %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ModifyDBClusterParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.ModifyDBClusterParameterGroup)을 참조하세요.

# SDK for Go V2를 사용한 Amazon Bedrock 예제
<a name="go_2_bedrock_code_examples"></a>

다음 코드 예제에서는 Amazon Bedrock과 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [작업](#actions)

## 시작하기
<a name="get_started"></a>

### Amazon Bedrock 시작
<a name="bedrock_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon Bedrock 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/bedrock"
)

const region = "us-east-1"

// main uses the AWS SDK for Go (v2) to create an Amazon Bedrock client and
// list the available foundation models in your account and the chosen region.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx, config.WithRegion(region))
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	bedrockClient := bedrock.NewFromConfig(sdkConfig)
	result, err := bedrockClient.ListFoundationModels(ctx, &bedrock.ListFoundationModelsInput{})
	if err != nil {
		fmt.Printf("Couldn't list foundation models. Here's why: %v\n", err)
		return
	}
	if len(result.ModelSummaries) == 0 {
		fmt.Println("There are no foundation models.")
	}
	for _, modelSummary := range result.ModelSummaries {
		fmt.Println(*modelSummary.ModelId)
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListFoundationModels](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrock#Client.ListFoundationModels)를 참조하세요.

## 작업
<a name="actions"></a>

### `ListFoundationModels`
<a name="bedrock_ListFoundationModels_go_2_topic"></a>

다음 코드 예시는 `ListFoundationModels`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
사용 가능한 Bedrock 기본 모델을 나열합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/service/bedrock"
	"github.com/aws/aws-sdk-go-v2/service/bedrock/types"
)

// FoundationModelWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock service client that is used to perform foundation model actions.
type FoundationModelWrapper struct {
	BedrockClient *bedrock.Client
}



// ListPolicies lists Bedrock foundation models that you can use.
func (wrapper FoundationModelWrapper) ListFoundationModels(ctx context.Context) ([]types.FoundationModelSummary, error) {

	var models []types.FoundationModelSummary

	result, err := wrapper.BedrockClient.ListFoundationModels(ctx, &bedrock.ListFoundationModelsInput{})

	if err != nil {
		log.Printf("Couldn't list foundation models. Here's why: %v\n", err)
	} else {
		models = result.ModelSummaries
	}
	return models, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListFoundationModels](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrock#Client.ListFoundationModels)를 참조하세요.

# SDK for Go V2를 사용한 Amazon Bedrock Runtime 예시
<a name="go_2_bedrock-runtime_code_examples"></a>

다음 코드 예제에서는 Amazon Bedrock 런타임과 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [시나리오](#scenarios)
+ [Amazon Titan Image Generator](#amazon_titan_image_generator)
+ [Anthropic Claude](#anthropic_claude)

## 시작하기
<a name="get_started"></a>

### Amazon Bedrock 시작
<a name="bedrock-runtime_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon Bedrock 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
)

// Each model provider defines their own individual request and response formats.
// For the format, ranges, and default values for the different models, refer to:
// https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters.html

type ClaudeRequest struct {
	Prompt            string `json:"prompt"`
	MaxTokensToSample int    `json:"max_tokens_to_sample"`
	// Omitting optional request parameters
}

type ClaudeResponse struct {
	Completion string `json:"completion"`
}

// main uses the AWS SDK for Go (v2) to create an Amazon Bedrock Runtime client
// and invokes Anthropic Claude 2 inside your account and the chosen region.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {

	region := flag.String("region", "us-east-1", "The AWS region")
	flag.Parse()

	fmt.Printf("Using AWS region: %s\n", *region)

	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx, config.WithRegion(*region))
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}

	client := bedrockruntime.NewFromConfig(sdkConfig)

	modelId := "anthropic.claude-v2"

	prompt := "Hello, how are you today?"

	// Anthropic Claude requires you to enclose the prompt as follows:
	prefix := "Human: "
	postfix := "\n\nAssistant:"
	wrappedPrompt := prefix + prompt + postfix

	request := ClaudeRequest{
		Prompt:            wrappedPrompt,
		MaxTokensToSample: 200,
	}

	body, err := json.Marshal(request)
	if err != nil {
		log.Panicln("Couldn't marshal the request: ", err)
	}

	result, err := client.InvokeModel(ctx, &bedrockruntime.InvokeModelInput{
		ModelId:     aws.String(modelId),
		ContentType: aws.String("application/json"),
		Body:        body,
	})

	if err != nil {
		errMsg := err.Error()
		if strings.Contains(errMsg, "no such host") {
			fmt.Printf("Error: The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
		} else if strings.Contains(errMsg, "Could not resolve the foundation model") {
			fmt.Printf("Error: Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
		} else {
			fmt.Printf("Error: Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
		}
		os.Exit(1)
	}

	var response ClaudeResponse

	err = json.Unmarshal(result.Body, &response)

	if err != nil {
		log.Fatal("failed to unmarshal", err)
	}
	fmt.Println("Prompt:\n", prompt)
	fmt.Println("Response from Anthropic Claude:\n", response.Completion)
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [InvokeModel](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModel)을 참조하세요.

## 시나리오
<a name="scenarios"></a>

### Amazon Bedrock에서 여러 파운데이션 모델 간접 호출
<a name="bedrock-runtime_Scenario_InvokeModels_go_2_topic"></a>

다음 코드 예제에서는 Amazon Bedrock에서 프롬프트를 준비하고 다양한 대규모 언어 모델(LLM)에 전송하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Amazon Bedrock에서 여러 파운데이션 모델을 간접 호출합니다.  

```
import (
	"context"
	"encoding/base64"
	"fmt"
	"log"
	"math/rand"
	"os"
	"path/filepath"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/bedrock-runtime/actions"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// InvokeModelsScenario demonstrates how to use the Amazon Bedrock Runtime client
// to invoke various foundation models for text and image generation
//
// 1. Generate text with Anthropic Claude 2
// 2. Generate text with Meta Llama 2 Chat
// 3. Generate text and asynchronously process the response stream with Anthropic Claude 2
// 4. Generate an image with the Amazon Titan image generation model
type InvokeModelsScenario struct {
	sdkConfig             aws.Config
	invokeModelWrapper    actions.InvokeModelWrapper
	responseStreamWrapper actions.InvokeModelWithResponseStreamWrapper
	questioner            demotools.IQuestioner
}

// NewInvokeModelsScenario constructs an InvokeModelsScenario instance from a configuration.
// It uses the specified config to get a Bedrock Runtime client and create wrappers for the
// actions used in the scenario.
func NewInvokeModelsScenario(sdkConfig aws.Config, questioner demotools.IQuestioner) InvokeModelsScenario {
	client := bedrockruntime.NewFromConfig(sdkConfig)
	return InvokeModelsScenario{
		sdkConfig:             sdkConfig,
		invokeModelWrapper:    actions.InvokeModelWrapper{BedrockRuntimeClient: client},
		responseStreamWrapper: actions.InvokeModelWithResponseStreamWrapper{BedrockRuntimeClient: client},
		questioner:            questioner,
	}
}

// Runs the interactive scenario.
func (scenario InvokeModelsScenario) Run(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong with the demo: %v\n", r)
		}
	}()

	log.Println(strings.Repeat("=", 77))
	log.Println("Welcome to the Amazon Bedrock Runtime model invocation demo.")
	log.Println(strings.Repeat("=", 77))

	log.Printf("First, let's invoke a few large-language models using the synchronous client:\n\n")

	text2textPrompt := "In one paragraph, who are you?"

	log.Println(strings.Repeat("-", 77))
	log.Printf("Invoking Claude with prompt: %v\n", text2textPrompt)
	scenario.InvokeClaude(ctx, text2textPrompt)

	log.Println(strings.Repeat("=", 77))
	log.Printf("Now, let's invoke Claude with the asynchronous client and process the response stream:\n\n")

	log.Println(strings.Repeat("-", 77))
	log.Printf("Invoking Claude with prompt: %v\n", text2textPrompt)
	scenario.InvokeWithResponseStream(ctx, text2textPrompt)

	log.Println(strings.Repeat("=", 77))
	log.Printf("Now, let's create an image with the Amazon Titan image generation model:\n\n")

	text2ImagePrompt := "stylized picture of a cute old steampunk robot"
	seed := rand.Int63n(2147483648)

	log.Println(strings.Repeat("-", 77))
	log.Printf("Invoking Amazon Titan with prompt: %v\n", text2ImagePrompt)
	scenario.InvokeTitanImage(ctx, text2ImagePrompt, seed)

	log.Println(strings.Repeat("=", 77))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("=", 77))
}

func (scenario InvokeModelsScenario) InvokeClaude(ctx context.Context, prompt string) {
	completion, err := scenario.invokeModelWrapper.InvokeClaude(ctx, prompt)
	if err != nil {
		panic(err)
	}
	log.Printf("\nClaude     : %v\n", strings.TrimSpace(completion))
}

func (scenario InvokeModelsScenario) InvokeWithResponseStream(ctx context.Context, prompt string) {
	log.Println("\nClaude with response stream:")
	_, err := scenario.responseStreamWrapper.InvokeModelWithResponseStream(ctx, prompt)
	if err != nil {
		panic(err)
	}
	log.Println()
}

func (scenario InvokeModelsScenario) InvokeTitanImage(ctx context.Context, prompt string, seed int64) {
	base64ImageData, err := scenario.invokeModelWrapper.InvokeTitanImage(ctx, prompt, seed)
	if err != nil {
		panic(err)
	}
	imagePath := saveImage(base64ImageData, "amazon.titan-image-generator-v2")
	fmt.Printf("The generated image has been saved to %s\n", imagePath)
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [InvokeModel](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModel)
  + [InvokeModelWithResponseStream](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModelWithResponseStream)

## Amazon Titan Image Generator
<a name="amazon_titan_image_generator"></a>

### InvokeModel
<a name="bedrock-runtime_InvokeModel_TitanImageGenerator_go_2_topic"></a>

다음 코드 예제에서는 이미지 생성을 위해 Amazon Bedrock에서 Amazon Titan Image를 간접 호출하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Amazon Titan Image Generator를 사용하여 이미지를 생성합니다.  

```
import (
	"context"
	"encoding/json"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
)

// InvokeModelWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke foundation models.
type InvokeModelWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



type TitanImageRequest struct {
	TaskType              string                `json:"taskType"`
	TextToImageParams     TextToImageParams     `json:"textToImageParams"`
	ImageGenerationConfig ImageGenerationConfig `json:"imageGenerationConfig"`
}
type TextToImageParams struct {
	Text string `json:"text"`
}
type ImageGenerationConfig struct {
	NumberOfImages int     `json:"numberOfImages"`
	Quality        string  `json:"quality"`
	CfgScale       float64 `json:"cfgScale"`
	Height         int     `json:"height"`
	Width          int     `json:"width"`
	Seed           int64   `json:"seed"`
}

type TitanImageResponse struct {
	Images []string `json:"images"`
}

// Invokes the Titan Image model to create an image using the input provided
// in the request body.
func (wrapper InvokeModelWrapper) InvokeTitanImage(ctx context.Context, prompt string, seed int64) (string, error) {
	modelId := "amazon.titan-image-generator-v2:0"

	body, err := json.Marshal(TitanImageRequest{
		TaskType: "TEXT_IMAGE",
		TextToImageParams: TextToImageParams{
			Text: prompt,
		},
		ImageGenerationConfig: ImageGenerationConfig{
			NumberOfImages: 1,
			Quality:        "standard",
			CfgScale:       8.0,
			Height:         512,
			Width:          512,
			Seed:           seed,
		},
	})

	if err != nil {
		log.Fatal("failed to marshal", err)
	}

	output, err := wrapper.BedrockRuntimeClient.InvokeModel(ctx, &bedrockruntime.InvokeModelInput{
		ModelId:     aws.String(modelId),
		ContentType: aws.String("application/json"),
		Body:        body,
	})

	if err != nil {
		ProcessError(err, modelId)
	}

	var response TitanImageResponse
	if err := json.Unmarshal(output.Body, &response); err != nil {
		log.Fatal("failed to unmarshal", err)
	}

	base64ImageData := response.Images[0]

	return base64ImageData, nil

}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [InvokeModel](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModel)을 참조하세요.

## Anthropic Claude
<a name="anthropic_claude"></a>

### Converse
<a name="bedrock-runtime_Converse_AnthropicClaude_go_2_topic"></a>

다음 코드 예제에서는 Bedrock의 Converse API를 사용하여 Anthropic Claude에 텍스트 메시지를 보내는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Bedrock의 Converse API를 사용하여 Anthropic Claude에 텍스트 메시지를 보냅니다.  

```
import (
	"context"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime/types"
)

// ConverseWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke Bedrock.
type ConverseWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



func (wrapper ConverseWrapper) ConverseClaude(ctx context.Context, prompt string) (string, error) {
	var content = types.ContentBlockMemberText{
		Value: prompt,
	}
	var message = types.Message{
		Content: []types.ContentBlock{&content},
		Role:    "user",
	}
	modelId := "anthropic.claude-3-haiku-20240307-v1:0"
	var converseInput = bedrockruntime.ConverseInput{
		ModelId:  aws.String(modelId),
		Messages: []types.Message{message},
	}
	response, err := wrapper.BedrockRuntimeClient.Converse(ctx, &converseInput)
	if err != nil {
		ProcessError(err, modelId)
	}

	responseText, _ := response.Output.(*types.ConverseOutputMemberMessage)
	responseContentBlock := responseText.Value.Content[0]
	text, _ := responseContentBlock.(*types.ContentBlockMemberText)
	return text.Value, nil

}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [Converse](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.Converse)를 참조하세요.

### InvokeModel
<a name="bedrock-runtime_InvokeModel_AnthropicClaude_go_2_topic"></a>

다음 코드 예제에서는 Invoke Model API를 사용하여 Anthropic Claude에 텍스트 메시지를 보내는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Anthropic Claude 2 파운데이션 모델을 간접 호출하여 텍스트를 생성합니다.  

```
import (
	"context"
	"encoding/json"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
)

// InvokeModelWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke foundation models.
type InvokeModelWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



// Each model provider has their own individual request and response formats.
// For the format, ranges, and default values for Anthropic Claude, refer to:
// https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-claude.html

type ClaudeRequest struct {
	Prompt            string   `json:"prompt"`
	MaxTokensToSample int      `json:"max_tokens_to_sample"`
	Temperature       float64  `json:"temperature,omitempty"`
	StopSequences     []string `json:"stop_sequences,omitempty"`
}

type ClaudeResponse struct {
	Completion string `json:"completion"`
}

// Invokes Anthropic Claude on Amazon Bedrock to run an inference using the input
// provided in the request body.
func (wrapper InvokeModelWrapper) InvokeClaude(ctx context.Context, prompt string) (string, error) {
	modelId := "anthropic.claude-v2"

	// Anthropic Claude requires enclosing the prompt as follows:
	enclosedPrompt := "Human: " + prompt + "\n\nAssistant:"

	body, err := json.Marshal(ClaudeRequest{
		Prompt:            enclosedPrompt,
		MaxTokensToSample: 200,
		Temperature:       0.5,
		StopSequences:     []string{"\n\nHuman:"},
	})

	if err != nil {
		log.Fatal("failed to marshal", err)
	}

	output, err := wrapper.BedrockRuntimeClient.InvokeModel(ctx, &bedrockruntime.InvokeModelInput{
		ModelId:     aws.String(modelId),
		ContentType: aws.String("application/json"),
		Body:        body,
	})

	if err != nil {
		ProcessError(err, modelId)
	}

	var response ClaudeResponse
	if err := json.Unmarshal(output.Body, &response); err != nil {
		log.Fatal("failed to unmarshal", err)
	}

	return response.Completion, nil
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [InvokeModel](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModel)을 참조하세요.

### InvokeModelWithResponseStream
<a name="bedrock-runtime_InvokeModelWithResponseStream_AnthropicClaude_go_2_topic"></a>

다음 코드 예제에서는 Invoke Model API를 사용하여 Anthropic Claude 모델에 텍스트 메시지를 보내고 응답 스트림을 프린트하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/bedrock-runtime#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Invoke Model API를 사용하여 텍스트 메시지를 보내고 응답 스트림을 실시간으로 처리합니다.  

```
import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime"
	"github.com/aws/aws-sdk-go-v2/service/bedrockruntime/types"
)

// InvokeModelWithResponseStreamWrapper encapsulates Amazon Bedrock actions used in the examples.
// It contains a Bedrock Runtime client that is used to invoke foundation models.
type InvokeModelWithResponseStreamWrapper struct {
	BedrockRuntimeClient *bedrockruntime.Client
}



// Each model provider defines their own individual request and response formats.
// For the format, ranges, and default values for the different models, refer to:
// https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters.html

type Request struct {
	Prompt            string  `json:"prompt"`
	MaxTokensToSample int     `json:"max_tokens_to_sample"`
	Temperature       float64 `json:"temperature,omitempty"`
}

type Response struct {
	Completion string `json:"completion"`
}

// Invokes Anthropic Claude on Amazon Bedrock to run an inference and asynchronously
// process the response stream.

func (wrapper InvokeModelWithResponseStreamWrapper) InvokeModelWithResponseStream(ctx context.Context, prompt string) (string, error) {

	modelId := "anthropic.claude-v2"

	// Anthropic Claude requires you to enclose the prompt as follows:
	prefix := "Human: "
	postfix := "\n\nAssistant:"
	prompt = prefix + prompt + postfix

	request := ClaudeRequest{
		Prompt:            prompt,
		MaxTokensToSample: 200,
		Temperature:       0.5,
		StopSequences:     []string{"\n\nHuman:"},
	}

	body, err := json.Marshal(request)
	if err != nil {
		log.Panicln("Couldn't marshal the request: ", err)
	}

	output, err := wrapper.BedrockRuntimeClient.InvokeModelWithResponseStream(ctx, &bedrockruntime.InvokeModelWithResponseStreamInput{
		Body:        body,
		ModelId:     aws.String(modelId),
		ContentType: aws.String("application/json"),
	})

	if err != nil {
		errMsg := err.Error()
		if strings.Contains(errMsg, "no such host") {
			log.Printf("The Bedrock service is not available in the selected region. Please double-check the service availability for your region at https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/.\n")
		} else if strings.Contains(errMsg, "Could not resolve the foundation model") {
			log.Printf("Could not resolve the foundation model from model identifier: \"%v\". Please verify that the requested model exists and is accessible within the specified region.\n", modelId)
		} else {
			log.Printf("Couldn't invoke Anthropic Claude. Here's why: %v\n", err)
		}
	}

	resp, err := processStreamingOutput(ctx, output, func(ctx context.Context, part []byte) error {
		fmt.Print(string(part))
		return nil
	})

	if err != nil {
		log.Fatal("streaming output processing error: ", err)
	}

	return resp.Completion, nil

}

type StreamingOutputHandler func(ctx context.Context, part []byte) error

func processStreamingOutput(ctx context.Context, output *bedrockruntime.InvokeModelWithResponseStreamOutput, handler StreamingOutputHandler) (Response, error) {

	var combinedResult string
	resp := Response{}

	for event := range output.GetStream().Events() {
		switch v := event.(type) {
		case *types.ResponseStreamMemberChunk:

			//fmt.Println("payload", string(v.Value.Bytes))

			var resp Response
			err := json.NewDecoder(bytes.NewReader(v.Value.Bytes)).Decode(&resp)
			if err != nil {
				return resp, err
			}

			err = handler(ctx, []byte(resp.Completion))
			if err != nil {
				return resp, err
			}

			combinedResult += resp.Completion

		case *types.UnknownUnionMember:
			fmt.Println("unknown tag:", v.Tag)

		default:
			fmt.Println("union is nil or unknown type")
		}
	}

	resp.Completion = combinedResult

	return resp, nil
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [InvokeModelWithResponseStream](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/bedrockruntime#Client.InvokeModelWithResponseStream)을 참조하세요.

# CloudFormation SDK for Go V2를 사용한 예제
<a name="go_2_cloudformation_code_examples"></a>

다음 코드 예제에서는와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다 CloudFormation.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [작업](#actions)

## 작업
<a name="actions"></a>

### `DescribeStacks`
<a name="cloudformation_DescribeStacks_go_2_topic"></a>

다음 코드 예시는 `DescribeStacks`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeStacks](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cloudformation#Client.DescribeStacks)를 참조하세요.

# SDK for Go V2를 사용한 CloudWatch Logs 예시
<a name="go_2_cloudwatch-logs_code_examples"></a>

다음 코드 예제에서는 CloudWatch Logs와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [작업](#actions)

## 작업
<a name="actions"></a>

### `StartLiveTail`
<a name="cloudwatch-logs_StartLiveTail_go_2_topic"></a>

다음 코드 예시는 `StartLiveTail`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
필수 파일을 포함합니다.  

```
import (
	"context"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)
```
Live Tail 세션의 이벤트를 처리합니다.  

```
func handleEventStreamAsync(stream *cloudwatchlogs.StartLiveTailEventStream) {
	eventsChan := stream.Events()
	for {
		event := <-eventsChan
		switch e := event.(type) {
		case *types.StartLiveTailResponseStreamMemberSessionStart:
			log.Println("Received SessionStart event")
		case *types.StartLiveTailResponseStreamMemberSessionUpdate:
			for _, logEvent := range e.Value.SessionResults {
				log.Println(*logEvent.Message)
			}
		default:
			// Handle on-stream exceptions
			if err := stream.Err(); err != nil {
				log.Fatalf("Error occured during streaming: %v", err)
			} else if event == nil {
				log.Println("Stream is Closed")
				return
			} else {
				log.Fatalf("Unknown event type: %T", e)
			}
		}
	}
}
```
Live Tail 세션을 시작합니다.  

```
	cfg, err := config.LoadDefaultConfig(context.TODO())
	if err != nil {
		panic("configuration error, " + err.Error())
	}
	client := cloudwatchlogs.NewFromConfig(cfg)

	request := &cloudwatchlogs.StartLiveTailInput{
		LogGroupIdentifiers:   logGroupIdentifiers,
		LogStreamNames:        logStreamNames,
		LogEventFilterPattern: logEventFilterPattern,
	}

	response, err := client.StartLiveTail(context.TODO(), request)
	// Handle pre-stream Exceptions
	if err != nil {
		log.Fatalf("Failed to start streaming: %v", err)
	}

	// Start a Goroutine to handle events over stream
	stream := response.GetStream()
	go handleEventStreamAsync(stream)
```
일정 시간이 경과하면 Live Tail 세션을 중단합니다.  

```
	// Close the stream (which ends the session) after a timeout
	time.Sleep(10 * time.Second)
	stream.Close()
	log.Println("Event stream closed")
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [StartLiveTail](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs#Client.StartLiveTail)을 참조하세요.

# SDK for Go V2를 사용한 Amazon Cognito ID 공급자 예제
<a name="go_2_cognito-identity-provider_code_examples"></a>

다음 코드 예제에서는 Amazon Cognito 자격 증명 공급자와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [작업](#actions)
+ [시나리오](#scenarios)

## 시작하기
<a name="get_started"></a>

### Hello Amazon Cognito
<a name="cognito-identity-provider_Hello_go_2_topic"></a>

다음 코드 예시에서는 Amazon Cognito 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Notification Service
// (Amazon SNS) client and list the topics in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	cognitoClient := cognitoidentityprovider.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the user pools for your account.")
	var pools []types.UserPoolDescriptionType
	paginator := cognitoidentityprovider.NewListUserPoolsPaginator(
		cognitoClient, &cognitoidentityprovider.ListUserPoolsInput{MaxResults: aws.Int32(10)})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get user pools. Here's why: %v\n", err)
		} else {
			pools = append(pools, output.UserPools...)
		}
	}
	if len(pools) == 0 {
		fmt.Println("You don't have any user pools!")
	} else {
		for _, pool := range pools {
			fmt.Printf("\t%v: %v\n", *pool.Name, *pool.Id)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ListUserPools)를 참조하세요.

## 작업
<a name="actions"></a>

### `AdminCreateUser`
<a name="cognito-identity-provider_AdminCreateUser_go_2_topic"></a>

다음 코드 예시는 `AdminCreateUser`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [AdminCreateUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminCreateUser)를 참조하세요.

### `AdminSetUserPassword`
<a name="cognito-identity-provider_AdminSetUserPassword_go_2_topic"></a>

다음 코드 예시는 `AdminSetUserPassword`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [AdminSetUserPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminSetUserPassword)를 참조하세요.

### `ConfirmForgotPassword`
<a name="cognito-identity-provider_ConfirmForgotPassword_go_2_topic"></a>

다음 코드 예시는 `ConfirmForgotPassword`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ConfirmForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ConfirmForgotPassword)를 참조하세요.

### `DeleteUser`
<a name="cognito-identity-provider_DeleteUser_go_2_topic"></a>

다음 코드 예시는 `DeleteUser`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)를 참조하세요.

### `ForgotPassword`
<a name="cognito-identity-provider_ForgotPassword_go_2_topic"></a>

다음 코드 예시는 `ForgotPassword`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ForgotPassword)를 참조하세요.

### `InitiateAuth`
<a name="cognito-identity-provider_InitiateAuth_go_2_topic"></a>

다음 코드 예시는 `InitiateAuth`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)를 참조하세요.

### `ListUserPools`
<a name="cognito-identity-provider_ListUserPools_go_2_topic"></a>

다음 코드 예시는 `ListUserPools`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Notification Service
// (Amazon SNS) client and list the topics in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	cognitoClient := cognitoidentityprovider.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the user pools for your account.")
	var pools []types.UserPoolDescriptionType
	paginator := cognitoidentityprovider.NewListUserPoolsPaginator(
		cognitoClient, &cognitoidentityprovider.ListUserPoolsInput{MaxResults: aws.Int32(10)})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get user pools. Here's why: %v\n", err)
		} else {
			pools = append(pools, output.UserPools...)
		}
	}
	if len(pools) == 0 {
		fmt.Println("You don't have any user pools!")
	} else {
		for _, pool := range pools {
			fmt.Printf("\t%v: %v\n", *pool.Name, *pool.Id)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ListUserPools)를 참조하세요.

### `SignUp`
<a name="cognito-identity-provider_SignUp_go_2_topic"></a>

다음 코드 예시는 `SignUp`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [SignUp](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.SignUp)를 참조하세요.

### `UpdateUserPool`
<a name="cognito-identity-provider_UpdateUserPool_go_2_topic"></a>

다음 코드 예시는 `UpdateUserPool`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/cognito#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)을 참조하세요.

## 시나리오
<a name="scenarios"></a>

### Lambda 함수를 사용하여 알려진 사용자를 자동으로 확인
<a name="cross_CognitoAutoConfirmUser_go_2_topic"></a>

다음 코드 예제는 Lambda 함수를 사용하여 알려진 Amazon Cognito 사용자를 자동으로 확인하는 방법을 보여줍니다.
+ `PreSignUp` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ Amazon Cognito를 사용하여 사용자 가입시키기
+ Lambda 함수는 DynamoDB 테이블을 스캔하고 알려진 사용자를 자동으로 확인합니다.
+ 새 사용자로 로그인한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// AutoConfirm separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type AutoConfirm struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewAutoConfirm constructs a new auto confirm runner.
func NewAutoConfirm(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) AutoConfirm {
	scenario := AutoConfirm{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddPreSignUpTrigger adds a Lambda handler as an invocation target for the PreSignUp trigger.
func (runner *AutoConfirm) AddPreSignUpTrigger(ctx context.Context, userPoolId string, functionArn string) {
	log.Printf("Let's add a Lambda function to handle the PreSignUp trigger from Cognito.\n" +
		"This trigger happens when a user signs up, and lets your function take action before the main Cognito\n" +
		"sign up processing occurs.\n")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.PreSignUp, HandlerArn: aws.String(functionArn)})
	if err != nil {
		panic(err)
	}
	log.Printf("Lambda function %v added to user pool %v to handle the PreSignUp trigger.\n",
		functionArn, userPoolId)
}

// SignUpUser signs up a user from the known user table with a password you specify.
func (runner *AutoConfirm) SignUpUser(ctx context.Context, clientId string, usersTable string) (string, string) {
	log.Println("Let's sign up a user to your Cognito user pool. When the user's email matches an email in the\n" +
		"DynamoDB known users table, it is automatically verified and the user is confirmed.")

	knownUsers, err := runner.helper.GetKnownUsers(ctx, usersTable)
	if err != nil {
		panic(err)
	}
	userChoice := runner.questioner.AskChoice("Which user do you want to use?\n", knownUsers.UserNameList())
	user := knownUsers.Users[userChoice]

	var signedUp bool
	var userConfirmed bool
	password := runner.questioner.AskPassword("Enter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !signedUp {
		log.Printf("Signing up user '%v' with email '%v' to Cognito.\n", user.UserName, user.UserEmail)
		userConfirmed, err = runner.cognitoActor.SignUp(ctx, clientId, user.UserName, password, user.UserEmail)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("Enter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			signedUp = true
		}
	}
	log.Printf("User %v signed up, confirmed = %v.\n", user.UserName, userConfirmed)

	log.Println(strings.Repeat("-", 88))

	return user.UserName, password
}

// SignInUser signs in a user.
func (runner *AutoConfirm) SignInUser(ctx context.Context, clientId string, userName string, password string) string {
	runner.questioner.Ask("Press Enter when you're ready to continue.")
	log.Printf("Let's sign in as %v...\n", userName)
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, userName, password)
	if err != nil {
		panic(err)
	}
	log.Printf("Successfully signed in. Your access token starts with: %v...\n", (*authResult.AccessToken)[:10])
	log.Println(strings.Repeat("-", 88))
	return *authResult.AccessToken
}

// Run runs the scenario.
func (runner *AutoConfirm) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]
	runner.helper.PopulateUserTable(ctx, stackOutputs["TableName"])

	runner.AddPreSignUpTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["AutoConfirmFunctionArn"])
	runner.resources.triggers = append(runner.resources.triggers, actions.PreSignUp)
	userName, password := runner.SignUpUser(ctx, stackOutputs["UserPoolClientId"], stackOutputs["TableName"])
	runner.helper.ListRecentLogEvents(ctx, stackOutputs["AutoConfirmFunction"])
	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens,
		runner.SignInUser(ctx, stackOutputs["UserPoolClientId"], userName, password))

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `PreSignUp` 트리거를 처리합니다.  

```
import (
	"context"
	"log"
	"os"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	dynamodbtypes "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

const TABLE_NAME = "TABLE_NAME"

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string `dynamodbav:"UserName"`
	UserEmail string `dynamodbav:"UserEmail"`
}

// GetKey marshals the user email value to a DynamoDB key format.
func (user UserInfo) GetKey() map[string]dynamodbtypes.AttributeValue {
	userEmail, err := attributevalue.Marshal(user.UserEmail)
	if err != nil {
		panic(err)
	}
	return map[string]dynamodbtypes.AttributeValue{"UserEmail": userEmail}
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the PreSignUp event by looking up a user in an Amazon DynamoDB table and
// specifying whether they should be confirmed and verified.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsPreSignup) (events.CognitoEventUserPoolsPreSignup, error) {
	log.Printf("Received presignup from %v for user '%v'", event.TriggerSource, event.UserName)
	if event.TriggerSource != "PreSignUp_SignUp" {
		// Other trigger sources, such as PreSignUp_AdminInitiateAuth, ignore the response from this handler.
		return event, nil
	}
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserEmail: event.Request.UserAttributes["email"],
	}
	log.Printf("Looking up email %v in table %v.\n", user.UserEmail, tableName)
	output, err := h.dynamoClient.GetItem(ctx, &dynamodb.GetItemInput{
		Key:       user.GetKey(),
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Error looking up email %v.\n", user.UserEmail)
		return event, err
	}
	if output.Item == nil {
		log.Printf("Email %v not found. Email verification is required.\n", user.UserEmail)
		return event, err
	}

	err = attributevalue.UnmarshalMap(output.Item, &user)
	if err != nil {
		log.Printf("Couldn't unmarshal DynamoDB item. Here's why: %v\n", err)
		return event, err
	}

	if user.UserName != event.UserName {
		log.Printf("UserEmail %v found, but stored UserName '%v' does not match supplied UserName '%v'. Verification is required.\n",
			user.UserEmail, user.UserName, event.UserName)
	} else {
		log.Printf("UserEmail %v found with matching UserName %v. User is confirmed.\n", user.UserEmail, user.UserName)
		event.Response.AutoConfirmUser = true
		event.Response.AutoVerifyEmail = true
	}

	return event, err
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [SignUp](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.SignUp)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

### Lambda 함수를 사용하여 알려진 사용자를 자동으로 마이그레이션
<a name="cross_CognitoAutoMigrateUser_go_2_topic"></a>

다음 코드 예제는 Lambda 함수를 사용하여 알려진 Amazon Cognito 사용자를 자동으로 마이그레이션하는 방법을 보여줍니다.
+ `MigrateUser` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ 사용자 풀에 없는 사용자 이름과 이메일을 사용하여 Amazon Cognito에 로그인합니다.
+ Lambda 함수는 DynamoDB 테이블을 스캔하고 알려진 사용자를 사용자 풀로 자동으로 마이그레이션합니다.
+ 암호 찾기 흐름을 수행하여 마이그레이션된 사용자의 암호를 재설정합니다.
+ 새 사용자로 로그인한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"fmt"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// MigrateUser separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type MigrateUser struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewMigrateUser constructs a new migrate user runner.
func NewMigrateUser(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) MigrateUser {
	scenario := MigrateUser{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddMigrateUserTrigger adds a Lambda handler as an invocation target for the MigrateUser trigger.
func (runner *MigrateUser) AddMigrateUserTrigger(ctx context.Context, userPoolId string, functionArn string) {
	log.Printf("Let's add a Lambda function to handle the MigrateUser trigger from Cognito.\n" +
		"This trigger happens when an unknown user signs in, and lets your function take action before Cognito\n" +
		"rejects the user.\n\n")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.UserMigration, HandlerArn: aws.String(functionArn)})
	if err != nil {
		panic(err)
	}
	log.Printf("Lambda function %v added to user pool %v to handle the MigrateUser trigger.\n",
		functionArn, userPoolId)

	log.Println(strings.Repeat("-", 88))
}

// SignInUser adds a new user to the known users table and signs that user in to Amazon Cognito.
func (runner *MigrateUser) SignInUser(ctx context.Context, usersTable string, clientId string) (bool, actions.User) {
	log.Println("Let's sign in a user to your Cognito user pool. When the username and email matches an entry in the\n" +
		"DynamoDB known users table, the email is automatically verified and the user is migrated to the Cognito user pool.")

	user := actions.User{}
	user.UserName = runner.questioner.Ask("\nEnter a username:")
	user.UserEmail = runner.questioner.Ask("\nEnter an email that you own. This email will be used to confirm user migration\n" +
		"during this example:")

	runner.helper.AddKnownUser(ctx, usersTable, user)

	var err error
	var resetRequired *types.PasswordResetRequiredException
	var authResult *types.AuthenticationResultType
	signedIn := false
	for !signedIn && resetRequired == nil {
		log.Printf("Signing in to Cognito as user '%v'. The expected result is a PasswordResetRequiredException.\n\n", user.UserName)
		authResult, err = runner.cognitoActor.SignIn(ctx, clientId, user.UserName, "_")
		if err != nil {
			if errors.As(err, &resetRequired) {
				log.Printf("\nUser '%v' is not in the Cognito user pool but was found in the DynamoDB known users table.\n"+
					"User migration is started and a password reset is required.", user.UserName)
			} else {
				panic(err)
			}
		} else {
			log.Printf("User '%v' successfully signed in. This is unexpected and probably means you have not\n"+
				"cleaned up a previous run of this scenario, so the user exist in the Cognito user pool.\n"+
				"You can continue this example and select to clean up resources, or manually remove\n"+
				"the user from your user pool and try again.", user.UserName)
			runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)
			signedIn = true
		}
	}

	log.Println(strings.Repeat("-", 88))
	return resetRequired != nil, user
}

// ResetPassword starts a password recovery flow.
func (runner *MigrateUser) ResetPassword(ctx context.Context, clientId string, user actions.User) {
	wantCode := runner.questioner.AskBool(fmt.Sprintf("In order to migrate the user to Cognito, you must be able to receive a confirmation\n"+
		"code by email at %v. Do you want to send a code (y/n)?", user.UserEmail), "y")
	if !wantCode {
		log.Println("To complete this example and successfully migrate a user to Cognito, you must enter an email\n" +
			"you own that can receive a confirmation code.")
		return
	}
	codeDelivery, err := runner.cognitoActor.ForgotPassword(ctx, clientId, user.UserName)
	if err != nil {
		panic(err)
	}
	log.Printf("\nA confirmation code has been sent to %v.", *codeDelivery.Destination)
	code := runner.questioner.Ask("Check your email and enter it here:")

	confirmed := false
	password := runner.questioner.AskPassword("\nEnter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !confirmed {
		log.Printf("\nConfirming password reset for user '%v'.\n", user.UserName)
		err = runner.cognitoActor.ConfirmForgotPassword(ctx, clientId, code, user.UserName, password)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("\nEnter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			confirmed = true
		}
	}
	log.Printf("User '%v' successfully confirmed and migrated.\n", user.UserName)
	log.Println("Signing in with your username and password...")
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, user.UserName, password)
	if err != nil {
		panic(err)
	}
	log.Printf("Successfully signed in. Your access token starts with: %v...\n", (*authResult.AccessToken)[:10])
	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)

	log.Println(strings.Repeat("-", 88))
}

// Run runs the scenario.
func (runner *MigrateUser) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]

	runner.AddMigrateUserTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["MigrateUserFunctionArn"])
	runner.resources.triggers = append(runner.resources.triggers, actions.UserMigration)
	resetNeeded, user := runner.SignInUser(ctx, stackOutputs["TableName"], stackOutputs["UserPoolClientId"])
	if resetNeeded {
		runner.helper.ListRecentLogEvents(ctx, stackOutputs["MigrateUserFunction"])
		runner.ResetPassword(ctx, stackOutputs["UserPoolClientId"], user)
	}

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `MigrateUser` 트리거를 처리합니다.  

```
import (
	"context"
	"log"
	"os"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
)

const TABLE_NAME = "TABLE_NAME"

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string `dynamodbav:"UserName"`
	UserEmail string `dynamodbav:"UserEmail"`
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the MigrateUser event by looking up a user in an Amazon DynamoDB table and
// specifying whether they should be migrated to the user pool.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsMigrateUser) (events.CognitoEventUserPoolsMigrateUser, error) {
	log.Printf("Received migrate trigger from %v for user '%v'", event.TriggerSource, event.UserName)
	if event.TriggerSource != "UserMigration_Authentication" {
		return event, nil
	}
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserName: event.UserName,
	}
	log.Printf("Looking up user '%v' in table %v.\n", user.UserName, tableName)
	filterEx := expression.Name("UserName").Equal(expression.Value(user.UserName))
	expr, err := expression.NewBuilder().WithFilter(filterEx).Build()
	if err != nil {
		log.Printf("Error building expression to query for user '%v'.\n", user.UserName)
		return event, err
	}
	output, err := h.dynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName:                 aws.String(tableName),
		FilterExpression:          expr.Filter(),
		ExpressionAttributeNames:  expr.Names(),
		ExpressionAttributeValues: expr.Values(),
	})
	if err != nil {
		log.Printf("Error looking up user '%v'.\n", user.UserName)
		return event, err
	}
	if len(output.Items) == 0 {
		log.Printf("User '%v' not found, not migrating user.\n", user.UserName)
		return event, err
	}

	var users []UserInfo
	err = attributevalue.UnmarshalListOfMaps(output.Items, &users)
	if err != nil {
		log.Printf("Couldn't unmarshal DynamoDB items. Here's why: %v\n", err)
		return event, err
	}

	user = users[0]
	log.Printf("UserName '%v' found with email %v. User is migrated and must reset password.\n", user.UserName, user.UserEmail)
	event.CognitoEventUserPoolsMigrateUserResponse.UserAttributes = map[string]string{
		"email":          user.UserEmail,
		"email_verified": "true", // email_verified is required for the forgot password flow.
	}
	event.CognitoEventUserPoolsMigrateUserResponse.FinalUserStatus = "RESET_REQUIRED"
	event.CognitoEventUserPoolsMigrateUserResponse.MessageAction = "SUPPRESS"

	return event, err
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [ConfirmForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ConfirmForgotPassword)
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [ForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ForgotPassword)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [SignUp](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.SignUp)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

### Amazon Cognito 사용자 인증 후 Lambda 함수를 사용하여 사용자 지정 활동 데이터 작성
<a name="cross_CognitoCustomActivityLog_go_2_topic"></a>

다음 코드 예제는 Amazon Cognito 사용자 인증 후 Lambda 함수를 사용하여 사용자 지정 작업 데이터를 쓰는 방법을 보여줍니다.
+ 관리자 함수를 사용하여 사용자 풀에 사용자를 추가합니다.
+ `PostAuthentication` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ 새로운 사용자를 Amazon Cognito에 로그인시킵니다.
+ Lambda 함수는 CloudWatch Logs와 DynamoDB 테이블에 사용자 지정 정보를 작성합니다.
+ DynamoDB 테이블에서 사용자 지정 데이터를 가져오기 및 표시한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// ActivityLog separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type ActivityLog struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewActivityLog constructs a new activity log runner.
func NewActivityLog(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) ActivityLog {
	scenario := ActivityLog{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddUserToPool selects a user from the known users table and uses administrator credentials to add the user to the user pool.
func (runner *ActivityLog) AddUserToPool(ctx context.Context, userPoolId string, tableName string) (string, string) {
	log.Println("To facilitate this example, let's add a user to the user pool using administrator privileges.")
	users, err := runner.helper.GetKnownUsers(ctx, tableName)
	if err != nil {
		panic(err)
	}
	user := users.Users[0]
	log.Printf("Adding known user %v to the user pool.\n", user.UserName)
	err = runner.cognitoActor.AdminCreateUser(ctx, userPoolId, user.UserName, user.UserEmail)
	if err != nil {
		panic(err)
	}
	pwSet := false
	password := runner.questioner.AskPassword("\nEnter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !pwSet {
		log.Printf("\nSetting password for user '%v'.\n", user.UserName)
		err = runner.cognitoActor.AdminSetUserPassword(ctx, userPoolId, user.UserName, password)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("\nEnter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			pwSet = true
		}
	}

	log.Println(strings.Repeat("-", 88))

	return user.UserName, password
}

// AddActivityLogTrigger adds a Lambda handler as an invocation target for the PostAuthentication trigger.
func (runner *ActivityLog) AddActivityLogTrigger(ctx context.Context, userPoolId string, activityLogArn string) {
	log.Println("Let's add a Lambda function to handle the PostAuthentication trigger from Cognito.\n" +
		"This trigger happens after a user is authenticated, and lets your function take action, such as logging\n" +
		"the outcome.")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.PostAuthentication, HandlerArn: aws.String(activityLogArn)})
	if err != nil {
		panic(err)
	}
	runner.resources.triggers = append(runner.resources.triggers, actions.PostAuthentication)
	log.Printf("Lambda function %v added to user pool %v to handle PostAuthentication Cognito trigger.\n",
		activityLogArn, userPoolId)

	log.Println(strings.Repeat("-", 88))
}

// SignInUser signs in as the specified user.
func (runner *ActivityLog) SignInUser(ctx context.Context, clientId string, userName string, password string) {
	log.Printf("Now we'll sign in user %v and check the results in the logs and the DynamoDB table.", userName)
	runner.questioner.Ask("Press Enter when you're ready.")
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, userName, password)
	if err != nil {
		panic(err)
	}
	log.Println("Sign in successful.",
		"The PostAuthentication Lambda handler writes custom information to CloudWatch Logs.")

	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)
}

// GetKnownUserLastLogin gets the login info for a user from the Amazon DynamoDB table and displays it.
func (runner *ActivityLog) GetKnownUserLastLogin(ctx context.Context, tableName string, userName string) {
	log.Println("The PostAuthentication handler also writes login data to the DynamoDB table.")
	runner.questioner.Ask("Press Enter when you're ready to continue.")
	users, err := runner.helper.GetKnownUsers(ctx, tableName)
	if err != nil {
		panic(err)
	}
	for _, user := range users.Users {
		if user.UserName == userName {
			log.Println("The last login info for the user in the known users table is:")
			log.Printf("\t%+v", *user.LastLogin)
		}
	}
	log.Println(strings.Repeat("-", 88))
}

// Run runs the scenario.
func (runner *ActivityLog) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]
	runner.helper.PopulateUserTable(ctx, stackOutputs["TableName"])
	userName, password := runner.AddUserToPool(ctx, stackOutputs["UserPoolId"], stackOutputs["TableName"])

	runner.AddActivityLogTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["ActivityLogFunctionArn"])
	runner.SignInUser(ctx, stackOutputs["UserPoolClientId"], userName, password)
	runner.helper.ListRecentLogEvents(ctx, stackOutputs["ActivityLogFunction"])
	runner.GetKnownUserLastLogin(ctx, stackOutputs["TableName"], userName)

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `PostAuthentication` 트리거를 처리합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"os"
	"time"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	dynamodbtypes "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

const TABLE_NAME = "TABLE_NAME"

// LoginInfo defines structured login data that can be marshalled to a DynamoDB format.
type LoginInfo struct {
	UserPoolId string `dynamodbav:"UserPoolId"`
	ClientId   string `dynamodbav:"ClientId"`
	Time       string `dynamodbav:"Time"`
}

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string    `dynamodbav:"UserName"`
	UserEmail string    `dynamodbav:"UserEmail"`
	LastLogin LoginInfo `dynamodbav:"LastLogin"`
}

// GetKey marshals the user email value to a DynamoDB key format.
func (user UserInfo) GetKey() map[string]dynamodbtypes.AttributeValue {
	userEmail, err := attributevalue.Marshal(user.UserEmail)
	if err != nil {
		panic(err)
	}
	return map[string]dynamodbtypes.AttributeValue{"UserEmail": userEmail}
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the PostAuthentication event by writing custom data to the logs and
// to an Amazon DynamoDB table.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsPostAuthentication) (events.CognitoEventUserPoolsPostAuthentication, error) {
	log.Printf("Received post authentication trigger from %v for user '%v'", event.TriggerSource, event.UserName)
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserName:  event.UserName,
		UserEmail: event.Request.UserAttributes["email"],
		LastLogin: LoginInfo{
			UserPoolId: event.UserPoolID,
			ClientId:   event.CallerContext.ClientID,
			Time:       time.Now().Format(time.UnixDate),
		},
	}
	// Write to CloudWatch Logs.
	fmt.Printf("%#v", user)

	// Also write to an external system. This examples uses DynamoDB to demonstrate.
	userMap, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshal to DynamoDB map. Here's why: %v\n", err)
	} else if len(userMap) == 0 {
		log.Printf("User info marshaled to an empty map.")
	} else {
		_, err := h.dynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
			Item:      userMap,
			TableName: aws.String(tableName),
		})
		if err != nil {
			log.Printf("Couldn't write to DynamoDB. Here's why: %v\n", err)
		} else {
			log.Printf("Wrote user info to DynamoDB table %v.\n", tableName)
		}
	}

	return event, nil
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [AdminCreateUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminCreateUser)
  + [AdminSetUserPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminSetUserPassword)
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

# SDK for Go V2를 사용한 Amazon DocumentDB 예제
<a name="go_2_docdb_code_examples"></a>

다음 코드 예제에서는 Amazon DocumentDB와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [서버리스 예제](#serverless_examples)

## 서버리스 예제
<a name="serverless_examples"></a>

### Amazon DocumentDB 트리거에서 간접적으로 Lambda 함수 호출
<a name="serverless_DocumentDB_Lambda_go_2_topic"></a>

다음 코드 예제에서는 DocumentDB 변경 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 DocumentDB 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-docdb-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Amazon DocumentDB 이벤트 소비  

```
package main

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/aws/aws-lambda-go/lambda"
)

type Event struct {
	Events []Record `json:"events"`
}

type Record struct {
	Event struct {
		OperationType string `json:"operationType"`
		NS            struct {
			DB   string `json:"db"`
			Coll string `json:"coll"`
		} `json:"ns"`
		FullDocument interface{} `json:"fullDocument"`
	} `json:"event"`
}

func main() {
	lambda.Start(handler)
}

func handler(ctx context.Context, event Event) (string, error) {
	fmt.Println("Loading function")
	for _, record := range event.Events {
		logDocumentDBEvent(record)
	}

	return "OK", nil
}

func logDocumentDBEvent(record Record) {
	fmt.Printf("Operation type: %s\n", record.Event.OperationType)
	fmt.Printf("db: %s\n", record.Event.NS.DB)
	fmt.Printf("collection: %s\n", record.Event.NS.Coll)
	docBytes, _ := json.MarshalIndent(record.Event.FullDocument, "", "  ")
	fmt.Printf("Full document: %s\n", string(docBytes))
}
```

# SDK for Go V2를 사용한 DynamoDB 예제
<a name="go_2_dynamodb_code_examples"></a>

다음 코드 예제에서는 DynamoDB와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

*AWS 커뮤니티 기여*는 여러 팀이 생성하고 유지 관리하는 예입니다 AWS. 피드백을 제공하려면 연결된 리포지토리에 제공된 메커니즘을 사용합니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [기본 사항](#basics)
+ [작업](#actions)
+ [시나리오](#scenarios)
+ [서버리스 예제](#serverless_examples)
+ [AWS 커뮤니티 기여](#aws_community_contributions)

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="dynamodb_Scenario_GettingStartedMovies_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 영화 데이터를 저장할 수 있는 테이블을 생성합니다.
+ 테이블에 하나의 영화를 추가하고 가져오고 업데이트합니다.
+ 샘플 JSON 파일에서 테이블에 영화 데이터를 씁니다.
+ 특정 연도에 개봉된 영화를 쿼리합니다.
+ 특정 연도 범위 동안 개봉된 영화를 스캔합니다.
+ 테이블에서 영화를 삭제한 다음, 테이블을 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
대화식 시나리오를 실행하여 테이블을 생성하고 테이블에 대한 작업을 수행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/dynamodb/actions"
)

// RunMovieScenario is an interactive example that shows you how to use the AWS SDK for Go
// to create and use an Amazon DynamoDB table that stores data about movies.
//
//  1. Create a table that can hold movie data.
//  2. Put, get, and update a single movie in the table.
//  3. Write movie data to the table from a sample JSON file.
//  4. Query for movies that were released in a given year.
//  5. Scan for movies that were released in a range of years.
//  6. Delete a movie from the table.
//  7. Delete the table.
//
// This example creates a DynamoDB service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
//
// The specified movie sampler is used to get sample data from a URL that is loaded
// into the named table.
func RunMovieScenario(
	ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner, tableName string,
	movieSampler actions.IMovieSampler) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Printf("Something went wrong with the demo.")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon DynamoDB getting started demo.")
	log.Println(strings.Repeat("-", 88))

	tableBasics := actions.TableBasics{TableName: tableName,
		DynamoDbClient: dynamodb.NewFromConfig(sdkConfig)}

	exists, err := tableBasics.TableExists(ctx)
	if err != nil {
		panic(err)
	}
	if !exists {
		log.Printf("Creating table %v...\n", tableName)
		_, err = tableBasics.CreateMovieTable(ctx)
		if err != nil {
			panic(err)
		} else {
			log.Printf("Created table %v.\n", tableName)
		}
	} else {
		log.Printf("Table %v already exists.\n", tableName)
	}

	var customMovie actions.Movie
	customMovie.Title = questioner.Ask("Enter a movie title to add to the table:",
		demotools.NotEmpty{})
	customMovie.Year = questioner.AskInt("What year was it released?",
		demotools.NotEmpty{}, demotools.InIntRange{Lower: 1900, Upper: 2030})
	customMovie.Info = map[string]interface{}{}
	customMovie.Info["rating"] = questioner.AskFloat64(
		"Enter a rating between 1 and 10:",
		demotools.NotEmpty{}, demotools.InFloatRange{Lower: 1, Upper: 10})
	customMovie.Info["plot"] = questioner.Ask("What's the plot? ",
		demotools.NotEmpty{})
	err = tableBasics.AddMovie(ctx, customMovie)
	if err == nil {
		log.Printf("Added %v to the movie table.\n", customMovie.Title)
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's update your movie. You previously rated it %v.\n", customMovie.Info["rating"])
	customMovie.Info["rating"] = questioner.AskFloat64(
		"What new rating would you give it?",
		demotools.NotEmpty{}, demotools.InFloatRange{Lower: 1, Upper: 10})
	log.Printf("You summarized the plot as '%v'.\n", customMovie.Info["plot"])
	customMovie.Info["plot"] = questioner.Ask("What would you say now?",
		demotools.NotEmpty{})
	attributes, err := tableBasics.UpdateMovie(ctx, customMovie)
	if err == nil {
		log.Printf("Updated %v with new values.\n", customMovie.Title)
		for _, attVal := range attributes {
			for valKey, val := range attVal {
				log.Printf("\t%v: %v\n", valKey, val)
			}
		}
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Getting movie data from %v and adding 250 movies to the table...\n",
		movieSampler.GetURL())
	movies := movieSampler.GetSampleMovies()
	written, err := tableBasics.AddMovieBatch(ctx, movies, 250)
	if err != nil {
		panic(err)
	} else {
		log.Printf("Added %v movies to the table.\n", written)
	}

	show := 10
	if show > written {
		show = written
	}
	log.Printf("The first %v movies in the table are:", show)
	for index, movie := range movies[:show] {
		log.Printf("\t%v. %v\n", index+1, movie.Title)
	}
	movieIndex := questioner.AskInt(
		"Enter the number of a movie to get info about it: ",
		demotools.InIntRange{Lower: 1, Upper: show},
	)
	movie, err := tableBasics.GetMovie(ctx, movies[movieIndex-1].Title, movies[movieIndex-1].Year)
	if err == nil {
		log.Println(movie)
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Let's get a list of movies released in a given year.")
	releaseYear := questioner.AskInt("Enter a year between 1972 and 2018: ",
		demotools.InIntRange{Lower: 1972, Upper: 2018},
	)
	releases, err := tableBasics.Query(ctx, releaseYear)
	if err == nil {
		if len(releases) == 0 {
			log.Printf("I couldn't find any movies released in %v!\n", releaseYear)
		} else {
			for _, movie = range releases {
				log.Println(movie)
			}
		}
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Now let's scan for movies released in a range of years.")
	startYear := questioner.AskInt("Enter a year: ",
		demotools.InIntRange{Lower: 1972, Upper: 2018})
	endYear := questioner.AskInt("Enter another year: ",
		demotools.InIntRange{Lower: 1972, Upper: 2018})
	releases, err = tableBasics.Scan(ctx, startYear, endYear)
	if err == nil {
		if len(releases) == 0 {
			log.Printf("I couldn't find any movies released between %v and %v!\n", startYear, endYear)
		} else {
			log.Printf("Found %v movies. In this list, the plot is <nil> because "+
				"we used a projection expression when scanning for items to return only "+
				"the title, year, and rating.\n", len(releases))
			for _, movie = range releases {
				log.Println(movie)
			}
		}
	}
	log.Println(strings.Repeat("-", 88))

	var tables []string
	if questioner.AskBool("Do you want to list all of your tables? (y/n) ", "y") {
		tables, err = tableBasics.ListTables(ctx)
		if err == nil {
			log.Printf("Found %v tables:", len(tables))
			for _, table := range tables {
				log.Printf("\t%v", table)
			}
		}
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's remove your movie '%v'.\n", customMovie.Title)
	if questioner.AskBool("Do you want to delete it from the table? (y/n) ", "y") {
		err = tableBasics.DeleteMovie(ctx, customMovie)
	}
	if err == nil {
		log.Printf("Deleted %v.\n", customMovie.Title)
	}

	if questioner.AskBool("Delete the table, too? (y/n)", "y") {
		err = tableBasics.DeleteTable(ctx)
	} else {
		log.Println("Don't forget to delete the table when you're done or you might " +
			"incur charges on your account.")
	}
	if err == nil {
		log.Printf("Deleted table %v.\n", tableBasics.TableName)
	}

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
DynamoDB 작업을 호출하는 구문과 메서드를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// TableExists determines whether a DynamoDB table exists.
func (basics TableBasics) TableExists(ctx context.Context) (bool, error) {
	exists := true
	_, err := basics.DynamoDbClient.DescribeTable(
		ctx, &dynamodb.DescribeTableInput{TableName: aws.String(basics.TableName)},
	)
	if err != nil {
		var notFoundEx *types.ResourceNotFoundException
		if errors.As(err, &notFoundEx) {
			log.Printf("Table %v does not exist.\n", basics.TableName)
			err = nil
		} else {
			log.Printf("Couldn't determine existence of table %v. Here's why: %v\n", basics.TableName, err)
		}
		exists = false
	}
	return exists, err
}



// CreateMovieTable creates a DynamoDB table with a composite primary key defined as
// a string sort key named `title`, and a numeric partition key named `year`.
// This function uses NewTableExistsWaiter to wait for the table to be created by
// DynamoDB before it returns.
func (basics TableBasics) CreateMovieTable(ctx context.Context) (*types.TableDescription, error) {
	var tableDesc *types.TableDescription
	table, err := basics.DynamoDbClient.CreateTable(ctx, &dynamodb.CreateTableInput{
		AttributeDefinitions: []types.AttributeDefinition{{
			AttributeName: aws.String("year"),
			AttributeType: types.ScalarAttributeTypeN,
		}, {
			AttributeName: aws.String("title"),
			AttributeType: types.ScalarAttributeTypeS,
		}},
		KeySchema: []types.KeySchemaElement{{
			AttributeName: aws.String("year"),
			KeyType:       types.KeyTypeHash,
		}, {
			AttributeName: aws.String("title"),
			KeyType:       types.KeyTypeRange,
		}},
		TableName:   aws.String(basics.TableName),
		BillingMode: types.BillingModePayPerRequest,
	})
	if err != nil {
		log.Printf("Couldn't create table %v. Here's why: %v\n", basics.TableName, err)
	} else {
		waiter := dynamodb.NewTableExistsWaiter(basics.DynamoDbClient)
		err = waiter.Wait(ctx, &dynamodb.DescribeTableInput{
			TableName: aws.String(basics.TableName)}, 5*time.Minute)
		if err != nil {
			log.Printf("Wait for table exists failed. Here's why: %v\n", err)
		}
		tableDesc = table.TableDescription
		log.Printf("Ccreating table test")
	}
	return tableDesc, err
}



// ListTables lists the DynamoDB table names for the current account.
func (basics TableBasics) ListTables(ctx context.Context) ([]string, error) {
	var tableNames []string
	var output *dynamodb.ListTablesOutput
	var err error
	tablePaginator := dynamodb.NewListTablesPaginator(basics.DynamoDbClient, &dynamodb.ListTablesInput{})
	for tablePaginator.HasMorePages() {
		output, err = tablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't list tables. Here's why: %v\n", err)
			break
		} else {
			tableNames = append(tableNames, output.TableNames...)
		}
	}
	return tableNames, err
}



// AddMovie adds a movie the DynamoDB table.
func (basics TableBasics) AddMovie(ctx context.Context, movie Movie) error {
	item, err := attributevalue.MarshalMap(movie)
	if err != nil {
		panic(err)
	}
	_, err = basics.DynamoDbClient.PutItem(ctx, &dynamodb.PutItemInput{
		TableName: aws.String(basics.TableName), Item: item,
	})
	if err != nil {
		log.Printf("Couldn't add item to table. Here's why: %v\n", err)
	}
	return err
}



// UpdateMovie updates the rating and plot of a movie that already exists in the
// DynamoDB table. This function uses the `expression` package to build the update
// expression.
func (basics TableBasics) UpdateMovie(ctx context.Context, movie Movie) (map[string]map[string]interface{}, error) {
	var err error
	var response *dynamodb.UpdateItemOutput
	var attributeMap map[string]map[string]interface{}
	update := expression.Set(expression.Name("info.rating"), expression.Value(movie.Info["rating"]))
	update.Set(expression.Name("info.plot"), expression.Value(movie.Info["plot"]))
	expr, err := expression.NewBuilder().WithUpdate(update).Build()
	if err != nil {
		log.Printf("Couldn't build expression for update. Here's why: %v\n", err)
	} else {
		response, err = basics.DynamoDbClient.UpdateItem(ctx, &dynamodb.UpdateItemInput{
			TableName:                 aws.String(basics.TableName),
			Key:                       movie.GetKey(),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			UpdateExpression:          expr.Update(),
			ReturnValues:              types.ReturnValueUpdatedNew,
		})
		if err != nil {
			log.Printf("Couldn't update movie %v. Here's why: %v\n", movie.Title, err)
		} else {
			err = attributevalue.UnmarshalMap(response.Attributes, &attributeMap)
			if err != nil {
				log.Printf("Couldn't unmarshall update response. Here's why: %v\n", err)
			}
		}
	}
	return attributeMap, err
}



// AddMovieBatch adds a slice of movies to the DynamoDB table. The function sends
// batches of 25 movies to DynamoDB until all movies are added or it reaches the
// specified maximum.
func (basics TableBasics) AddMovieBatch(ctx context.Context, movies []Movie, maxMovies int) (int, error) {
	var err error
	var item map[string]types.AttributeValue
	written := 0
	batchSize := 25 // DynamoDB allows a maximum batch size of 25 items.
	start := 0
	end := start + batchSize
	for start < maxMovies && start < len(movies) {
		var writeReqs []types.WriteRequest
		if end > len(movies) {
			end = len(movies)
		}
		for _, movie := range movies[start:end] {
			item, err = attributevalue.MarshalMap(movie)
			if err != nil {
				log.Printf("Couldn't marshal movie %v for batch writing. Here's why: %v\n", movie.Title, err)
			} else {
				writeReqs = append(
					writeReqs,
					types.WriteRequest{PutRequest: &types.PutRequest{Item: item}},
				)
			}
		}
		_, err = basics.DynamoDbClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
			RequestItems: map[string][]types.WriteRequest{basics.TableName: writeReqs}})
		if err != nil {
			log.Printf("Couldn't add a batch of movies to %v. Here's why: %v\n", basics.TableName, err)
		} else {
			written += len(writeReqs)
		}
		start = end
		end += batchSize
	}

	return written, err
}



// GetMovie gets movie data from the DynamoDB table by using the primary composite key
// made of title and year.
func (basics TableBasics) GetMovie(ctx context.Context, title string, year int) (Movie, error) {
	movie := Movie{Title: title, Year: year}
	response, err := basics.DynamoDbClient.GetItem(ctx, &dynamodb.GetItemInput{
		Key: movie.GetKey(), TableName: aws.String(basics.TableName),
	})
	if err != nil {
		log.Printf("Couldn't get info about %v. Here's why: %v\n", title, err)
	} else {
		err = attributevalue.UnmarshalMap(response.Item, &movie)
		if err != nil {
			log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
		}
	}
	return movie, err
}



// Query gets all movies in the DynamoDB table that were released in the specified year.
// The function uses the `expression` package to build the key condition expression
// that is used in the query.
func (basics TableBasics) Query(ctx context.Context, releaseYear int) ([]Movie, error) {
	var err error
	var response *dynamodb.QueryOutput
	var movies []Movie
	keyEx := expression.Key("year").Equal(expression.Value(releaseYear))
	expr, err := expression.NewBuilder().WithKeyCondition(keyEx).Build()
	if err != nil {
		log.Printf("Couldn't build expression for query. Here's why: %v\n", err)
	} else {
		queryPaginator := dynamodb.NewQueryPaginator(basics.DynamoDbClient, &dynamodb.QueryInput{
			TableName:                 aws.String(basics.TableName),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			KeyConditionExpression:    expr.KeyCondition(),
		})
		for queryPaginator.HasMorePages() {
			response, err = queryPaginator.NextPage(ctx)
			if err != nil {
				log.Printf("Couldn't query for movies released in %v. Here's why: %v\n", releaseYear, err)
				break
			} else {
				var moviePage []Movie
				err = attributevalue.UnmarshalListOfMaps(response.Items, &moviePage)
				if err != nil {
					log.Printf("Couldn't unmarshal query response. Here's why: %v\n", err)
					break
				} else {
					movies = append(movies, moviePage...)
				}
			}
		}
	}
	return movies, err
}



// Scan gets all movies in the DynamoDB table that were released in a range of years
// and projects them to return a reduced set of fields.
// The function uses the `expression` package to build the filter and projection
// expressions.
func (basics TableBasics) Scan(ctx context.Context, startYear int, endYear int) ([]Movie, error) {
	var movies []Movie
	var err error
	var response *dynamodb.ScanOutput
	filtEx := expression.Name("year").Between(expression.Value(startYear), expression.Value(endYear))
	projEx := expression.NamesList(
		expression.Name("year"), expression.Name("title"), expression.Name("info.rating"))
	expr, err := expression.NewBuilder().WithFilter(filtEx).WithProjection(projEx).Build()
	if err != nil {
		log.Printf("Couldn't build expressions for scan. Here's why: %v\n", err)
	} else {
		scanPaginator := dynamodb.NewScanPaginator(basics.DynamoDbClient, &dynamodb.ScanInput{
			TableName:                 aws.String(basics.TableName),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			FilterExpression:          expr.Filter(),
			ProjectionExpression:      expr.Projection(),
		})
		for scanPaginator.HasMorePages() {
			response, err = scanPaginator.NextPage(ctx)
			if err != nil {
				log.Printf("Couldn't scan for movies released between %v and %v. Here's why: %v\n",
					startYear, endYear, err)
				break
			} else {
				var moviePage []Movie
				err = attributevalue.UnmarshalListOfMaps(response.Items, &moviePage)
				if err != nil {
					log.Printf("Couldn't unmarshal query response. Here's why: %v\n", err)
					break
				} else {
					movies = append(movies, moviePage...)
				}
			}
		}
	}
	return movies, err
}



// DeleteMovie removes a movie from the DynamoDB table.
func (basics TableBasics) DeleteMovie(ctx context.Context, movie Movie) error {
	_, err := basics.DynamoDbClient.DeleteItem(ctx, &dynamodb.DeleteItemInput{
		TableName: aws.String(basics.TableName), Key: movie.GetKey(),
	})
	if err != nil {
		log.Printf("Couldn't delete %v from the table. Here's why: %v\n", movie.Title, err)
	}
	return err
}



// DeleteTable deletes the DynamoDB table and all of its data.
func (basics TableBasics) DeleteTable(ctx context.Context) error {
	_, err := basics.DynamoDbClient.DeleteTable(ctx, &dynamodb.DeleteTableInput{
		TableName: aws.String(basics.TableName)})
	if err != nil {
		log.Printf("Couldn't delete table %v. Here's why: %v\n", basics.TableName, err)
	}
	return err
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [BatchWriteItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.BatchWriteItem)
  + [CreateTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.CreateTable)
  + [DeleteItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DeleteItem)
  + [DeleteTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DeleteTable)
  + [DescribeTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DescribeTable)
  + [GetItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.GetItem)
  + [PutItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.PutItem)
  + [Query](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.Query)
  + [Scan](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.Scan)
  + [UpdateItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.UpdateItem)

## 작업
<a name="actions"></a>

### `BatchExecuteStatement`
<a name="dynamodb_BatchExecuteStatement_go_2_topic"></a>

다음 코드 예시는 `BatchExecuteStatement`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
예제를 위한 함수 수신기 구문을 정의합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// PartiQLRunner encapsulates the Amazon DynamoDB service actions used in the
// PartiQL examples. It contains a DynamoDB service client that is used to act on the
// specified table.
type PartiQLRunner struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}
```
INSERT 문 배치를 사용하여 항목을 추가합니다.  

```
// AddMovieBatch runs a batch of PartiQL INSERT statements to add multiple movies to the
// DynamoDB table.
func (runner PartiQLRunner) AddMovieBatch(ctx context.Context, movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year, movie.Info})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(fmt.Sprintf(
				"INSERT INTO \"%v\" VALUE {'title': ?, 'year': ?, 'info': ?}", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't insert a batch of items with PartiQL. Here's why: %v\n", err)
	}
	return err
}
```
SELECT 문 배치를 사용하여 항목을 가져옵니다.  

```
// GetMovieBatch runs a batch of PartiQL SELECT statements to get multiple movies from
// the DynamoDB table by title and year.
func (runner PartiQLRunner) GetMovieBatch(ctx context.Context, movies []Movie) ([]Movie, error) {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("SELECT * FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	output, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	var outMovies []Movie
	if err != nil {
		log.Printf("Couldn't get a batch of items with PartiQL. Here's why: %v\n", err)
	} else {
		for _, response := range output.Responses {
			var movie Movie
			err = attributevalue.UnmarshalMap(response.Item, &movie)
			if err != nil {
				log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
			} else {
				outMovies = append(outMovies, movie)
			}
		}
	}
	return outMovies, err
}
```
UPDATE 문 배치를 사용하여 항목을 업데이트합니다.  

```
// UpdateMovieBatch runs a batch of PartiQL UPDATE statements to update the rating of
// multiple movies that already exist in the DynamoDB table.
func (runner PartiQLRunner) UpdateMovieBatch(ctx context.Context, movies []Movie, ratings []float64) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{ratings[index], movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("UPDATE \"%v\" SET info.rating=? WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't update the batch of movies. Here's why: %v\n", err)
	}
	return err
}
```
DELETE 문 배치를 사용하여 항목을 삭제합니다.  

```
// DeleteMovieBatch runs a batch of PartiQL DELETE statements to remove multiple movies
// from the DynamoDB table.
func (runner PartiQLRunner) DeleteMovieBatch(ctx context.Context, movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("DELETE FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't delete the batch of movies. Here's why: %v\n", err)
	}
	return err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [BatchExecuteStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.BatchExecuteStatement)를 참조하세요.

### `BatchWriteItem`
<a name="dynamodb_BatchWriteItem_go_2_topic"></a>

다음 코드 예시는 `BatchWriteItem`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// AddMovieBatch adds a slice of movies to the DynamoDB table. The function sends
// batches of 25 movies to DynamoDB until all movies are added or it reaches the
// specified maximum.
func (basics TableBasics) AddMovieBatch(ctx context.Context, movies []Movie, maxMovies int) (int, error) {
	var err error
	var item map[string]types.AttributeValue
	written := 0
	batchSize := 25 // DynamoDB allows a maximum batch size of 25 items.
	start := 0
	end := start + batchSize
	for start < maxMovies && start < len(movies) {
		var writeReqs []types.WriteRequest
		if end > len(movies) {
			end = len(movies)
		}
		for _, movie := range movies[start:end] {
			item, err = attributevalue.MarshalMap(movie)
			if err != nil {
				log.Printf("Couldn't marshal movie %v for batch writing. Here's why: %v\n", movie.Title, err)
			} else {
				writeReqs = append(
					writeReqs,
					types.WriteRequest{PutRequest: &types.PutRequest{Item: item}},
				)
			}
		}
		_, err = basics.DynamoDbClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
			RequestItems: map[string][]types.WriteRequest{basics.TableName: writeReqs}})
		if err != nil {
			log.Printf("Couldn't add a batch of movies to %v. Here's why: %v\n", basics.TableName, err)
		} else {
			written += len(writeReqs)
		}
		start = end
		end += batchSize
	}

	return written, err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [BatchWriteItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.BatchWriteItem)을 참조하세요.

### `CreateTable`
<a name="dynamodb_CreateTable_go_2_topic"></a>

다음 코드 예시는 `CreateTable`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// CreateMovieTable creates a DynamoDB table with a composite primary key defined as
// a string sort key named `title`, and a numeric partition key named `year`.
// This function uses NewTableExistsWaiter to wait for the table to be created by
// DynamoDB before it returns.
func (basics TableBasics) CreateMovieTable(ctx context.Context) (*types.TableDescription, error) {
	var tableDesc *types.TableDescription
	table, err := basics.DynamoDbClient.CreateTable(ctx, &dynamodb.CreateTableInput{
		AttributeDefinitions: []types.AttributeDefinition{{
			AttributeName: aws.String("year"),
			AttributeType: types.ScalarAttributeTypeN,
		}, {
			AttributeName: aws.String("title"),
			AttributeType: types.ScalarAttributeTypeS,
		}},
		KeySchema: []types.KeySchemaElement{{
			AttributeName: aws.String("year"),
			KeyType:       types.KeyTypeHash,
		}, {
			AttributeName: aws.String("title"),
			KeyType:       types.KeyTypeRange,
		}},
		TableName:   aws.String(basics.TableName),
		BillingMode: types.BillingModePayPerRequest,
	})
	if err != nil {
		log.Printf("Couldn't create table %v. Here's why: %v\n", basics.TableName, err)
	} else {
		waiter := dynamodb.NewTableExistsWaiter(basics.DynamoDbClient)
		err = waiter.Wait(ctx, &dynamodb.DescribeTableInput{
			TableName: aws.String(basics.TableName)}, 5*time.Minute)
		if err != nil {
			log.Printf("Wait for table exists failed. Here's why: %v\n", err)
		}
		tableDesc = table.TableDescription
		log.Printf("Ccreating table test")
	}
	return tableDesc, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.CreateTable)을 참조하세요.

### `DeleteItem`
<a name="dynamodb_DeleteItem_go_2_topic"></a>

다음 코드 예시는 `DeleteItem`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// DeleteMovie removes a movie from the DynamoDB table.
func (basics TableBasics) DeleteMovie(ctx context.Context, movie Movie) error {
	_, err := basics.DynamoDbClient.DeleteItem(ctx, &dynamodb.DeleteItemInput{
		TableName: aws.String(basics.TableName), Key: movie.GetKey(),
	})
	if err != nil {
		log.Printf("Couldn't delete %v from the table. Here's why: %v\n", movie.Title, err)
	}
	return err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DeleteItem)을 참조하세요.

### `DeleteTable`
<a name="dynamodb_DeleteTable_go_2_topic"></a>

다음 코드 예시는 `DeleteTable`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// DeleteTable deletes the DynamoDB table and all of its data.
func (basics TableBasics) DeleteTable(ctx context.Context) error {
	_, err := basics.DynamoDbClient.DeleteTable(ctx, &dynamodb.DeleteTableInput{
		TableName: aws.String(basics.TableName)})
	if err != nil {
		log.Printf("Couldn't delete table %v. Here's why: %v\n", basics.TableName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DeleteTable)을 참조하세요.

### `DescribeTable`
<a name="dynamodb_DescribeTable_go_2_topic"></a>

다음 코드 예시는 `DescribeTable`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// TableExists determines whether a DynamoDB table exists.
func (basics TableBasics) TableExists(ctx context.Context) (bool, error) {
	exists := true
	_, err := basics.DynamoDbClient.DescribeTable(
		ctx, &dynamodb.DescribeTableInput{TableName: aws.String(basics.TableName)},
	)
	if err != nil {
		var notFoundEx *types.ResourceNotFoundException
		if errors.As(err, &notFoundEx) {
			log.Printf("Table %v does not exist.\n", basics.TableName)
			err = nil
		} else {
			log.Printf("Couldn't determine existence of table %v. Here's why: %v\n", basics.TableName, err)
		}
		exists = false
	}
	return exists, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeTable](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.DescribeTable)을 참조하세요.

### `ExecuteStatement`
<a name="dynamodb_ExecuteStatement_go_2_topic"></a>

다음 코드 예시는 `ExecuteStatement`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
예제를 위한 함수 수신기 구문을 정의합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// PartiQLRunner encapsulates the Amazon DynamoDB service actions used in the
// PartiQL examples. It contains a DynamoDB service client that is used to act on the
// specified table.
type PartiQLRunner struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}
```
INSERT 문을 사용하여 항목을 추가합니다.  

```
// AddMovie runs a PartiQL INSERT statement to add a movie to the DynamoDB table.
func (runner PartiQLRunner) AddMovie(ctx context.Context, movie Movie) error {
	params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year, movie.Info})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("INSERT INTO \"%v\" VALUE {'title': ?, 'year': ?, 'info': ?}",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't insert an item with PartiQL. Here's why: %v\n", err)
	}
	return err
}
```
SELECT 문을 사용하여 항목을 가져옵니다.  

```
// GetMovie runs a PartiQL SELECT statement to get a movie from the DynamoDB table by
// title and year.
func (runner PartiQLRunner) GetMovie(ctx context.Context, title string, year int) (Movie, error) {
	var movie Movie
	params, err := attributevalue.MarshalList([]interface{}{title, year})
	if err != nil {
		panic(err)
	}
	response, err := runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("SELECT * FROM \"%v\" WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't get info about %v. Here's why: %v\n", title, err)
	} else {
		err = attributevalue.UnmarshalMap(response.Items[0], &movie)
		if err != nil {
			log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
		}
	}
	return movie, err
}
```
SELECT 문을 사용하여 항목 목록을 가져오고 결과를 투영합니다.  

```
// GetAllMovies runs a PartiQL SELECT statement to get all movies from the DynamoDB table.
// pageSize is not typically required and is used to show how to paginate the results.
// The results are projected to return only the title and rating of each movie.
func (runner PartiQLRunner) GetAllMovies(ctx context.Context, pageSize int32) ([]map[string]interface{}, error) {
	var output []map[string]interface{}
	var response *dynamodb.ExecuteStatementOutput
	var err error
	var nextToken *string
	for moreData := true; moreData; {
		response, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
			Statement: aws.String(
				fmt.Sprintf("SELECT title, info.rating FROM \"%v\"", runner.TableName)),
			Limit:     aws.Int32(pageSize),
			NextToken: nextToken,
		})
		if err != nil {
			log.Printf("Couldn't get movies. Here's why: %v\n", err)
			moreData = false
		} else {
			var pageOutput []map[string]interface{}
			err = attributevalue.UnmarshalListOfMaps(response.Items, &pageOutput)
			if err != nil {
				log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
			} else {
				log.Printf("Got a page of length %v.\n", len(response.Items))
				output = append(output, pageOutput...)
			}
			nextToken = response.NextToken
			moreData = nextToken != nil
		}
	}
	return output, err
}
```
UPDATE 문을 사용하여 항목을 업데이트합니다.  

```
// UpdateMovie runs a PartiQL UPDATE statement to update the rating of a movie that
// already exists in the DynamoDB table.
func (runner PartiQLRunner) UpdateMovie(ctx context.Context, movie Movie, rating float64) error {
	params, err := attributevalue.MarshalList([]interface{}{rating, movie.Title, movie.Year})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("UPDATE \"%v\" SET info.rating=? WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't update movie %v. Here's why: %v\n", movie.Title, err)
	}
	return err
}
```
DELETE 문을 사용하여 항목을 삭제합니다.  

```
// DeleteMovie runs a PartiQL DELETE statement to remove a movie from the DynamoDB table.
func (runner PartiQLRunner) DeleteMovie(ctx context.Context, movie Movie) error {
	params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("DELETE FROM \"%v\" WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't delete %v from the table. Here's why: %v\n", movie.Title, err)
	}
	return err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ExecuteStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.ExecuteStatement)를 참조하세요.

### `GetItem`
<a name="dynamodb_GetItem_go_2_topic"></a>

다음 코드 예시는 `GetItem`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// GetMovie gets movie data from the DynamoDB table by using the primary composite key
// made of title and year.
func (basics TableBasics) GetMovie(ctx context.Context, title string, year int) (Movie, error) {
	movie := Movie{Title: title, Year: year}
	response, err := basics.DynamoDbClient.GetItem(ctx, &dynamodb.GetItemInput{
		Key: movie.GetKey(), TableName: aws.String(basics.TableName),
	})
	if err != nil {
		log.Printf("Couldn't get info about %v. Here's why: %v\n", title, err)
	} else {
		err = attributevalue.UnmarshalMap(response.Item, &movie)
		if err != nil {
			log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
		}
	}
	return movie, err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.GetItem)을 참조하세요.

### `ListTables`
<a name="dynamodb_ListTables_go_2_topic"></a>

다음 코드 예시는 `ListTables`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// ListTables lists the DynamoDB table names for the current account.
func (basics TableBasics) ListTables(ctx context.Context) ([]string, error) {
	var tableNames []string
	var output *dynamodb.ListTablesOutput
	var err error
	tablePaginator := dynamodb.NewListTablesPaginator(basics.DynamoDbClient, &dynamodb.ListTablesInput{})
	for tablePaginator.HasMorePages() {
		output, err = tablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't list tables. Here's why: %v\n", err)
			break
		} else {
			tableNames = append(tableNames, output.TableNames...)
		}
	}
	return tableNames, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListTables](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.ListTables)를 참조하세요.

### `PutItem`
<a name="dynamodb_PutItem_go_2_topic"></a>

다음 코드 예시는 `PutItem`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// AddMovie adds a movie the DynamoDB table.
func (basics TableBasics) AddMovie(ctx context.Context, movie Movie) error {
	item, err := attributevalue.MarshalMap(movie)
	if err != nil {
		panic(err)
	}
	_, err = basics.DynamoDbClient.PutItem(ctx, &dynamodb.PutItemInput{
		TableName: aws.String(basics.TableName), Item: item,
	})
	if err != nil {
		log.Printf("Couldn't add item to table. Here's why: %v\n", err)
	}
	return err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [PutItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.PutItem)을 참조하세요.

### `Query`
<a name="dynamodb_Query_go_2_topic"></a>

다음 코드 예시는 `Query`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// Query gets all movies in the DynamoDB table that were released in the specified year.
// The function uses the `expression` package to build the key condition expression
// that is used in the query.
func (basics TableBasics) Query(ctx context.Context, releaseYear int) ([]Movie, error) {
	var err error
	var response *dynamodb.QueryOutput
	var movies []Movie
	keyEx := expression.Key("year").Equal(expression.Value(releaseYear))
	expr, err := expression.NewBuilder().WithKeyCondition(keyEx).Build()
	if err != nil {
		log.Printf("Couldn't build expression for query. Here's why: %v\n", err)
	} else {
		queryPaginator := dynamodb.NewQueryPaginator(basics.DynamoDbClient, &dynamodb.QueryInput{
			TableName:                 aws.String(basics.TableName),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			KeyConditionExpression:    expr.KeyCondition(),
		})
		for queryPaginator.HasMorePages() {
			response, err = queryPaginator.NextPage(ctx)
			if err != nil {
				log.Printf("Couldn't query for movies released in %v. Here's why: %v\n", releaseYear, err)
				break
			} else {
				var moviePage []Movie
				err = attributevalue.UnmarshalListOfMaps(response.Items, &moviePage)
				if err != nil {
					log.Printf("Couldn't unmarshal query response. Here's why: %v\n", err)
					break
				} else {
					movies = append(movies, moviePage...)
				}
			}
		}
	}
	return movies, err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [Query](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.Query)를 참조하세요.

### `Scan`
<a name="dynamodb_Scan_go_2_topic"></a>

다음 코드 예시는 `Scan`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// Scan gets all movies in the DynamoDB table that were released in a range of years
// and projects them to return a reduced set of fields.
// The function uses the `expression` package to build the filter and projection
// expressions.
func (basics TableBasics) Scan(ctx context.Context, startYear int, endYear int) ([]Movie, error) {
	var movies []Movie
	var err error
	var response *dynamodb.ScanOutput
	filtEx := expression.Name("year").Between(expression.Value(startYear), expression.Value(endYear))
	projEx := expression.NamesList(
		expression.Name("year"), expression.Name("title"), expression.Name("info.rating"))
	expr, err := expression.NewBuilder().WithFilter(filtEx).WithProjection(projEx).Build()
	if err != nil {
		log.Printf("Couldn't build expressions for scan. Here's why: %v\n", err)
	} else {
		scanPaginator := dynamodb.NewScanPaginator(basics.DynamoDbClient, &dynamodb.ScanInput{
			TableName:                 aws.String(basics.TableName),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			FilterExpression:          expr.Filter(),
			ProjectionExpression:      expr.Projection(),
		})
		for scanPaginator.HasMorePages() {
			response, err = scanPaginator.NextPage(ctx)
			if err != nil {
				log.Printf("Couldn't scan for movies released between %v and %v. Here's why: %v\n",
					startYear, endYear, err)
				break
			} else {
				var moviePage []Movie
				err = attributevalue.UnmarshalListOfMaps(response.Items, &moviePage)
				if err != nil {
					log.Printf("Couldn't unmarshal query response. Here's why: %v\n", err)
					break
				} else {
					movies = append(movies, moviePage...)
				}
			}
		}
	}
	return movies, err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [Scan](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.Scan)을 참조하세요.

### `UpdateItem`
<a name="dynamodb_UpdateItem_go_2_topic"></a>

다음 코드 예시는 `UpdateItem`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples.
// It contains a DynamoDB service client that is used to act on the specified table.
type TableBasics struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// UpdateMovie updates the rating and plot of a movie that already exists in the
// DynamoDB table. This function uses the `expression` package to build the update
// expression.
func (basics TableBasics) UpdateMovie(ctx context.Context, movie Movie) (map[string]map[string]interface{}, error) {
	var err error
	var response *dynamodb.UpdateItemOutput
	var attributeMap map[string]map[string]interface{}
	update := expression.Set(expression.Name("info.rating"), expression.Value(movie.Info["rating"]))
	update.Set(expression.Name("info.plot"), expression.Value(movie.Info["plot"]))
	expr, err := expression.NewBuilder().WithUpdate(update).Build()
	if err != nil {
		log.Printf("Couldn't build expression for update. Here's why: %v\n", err)
	} else {
		response, err = basics.DynamoDbClient.UpdateItem(ctx, &dynamodb.UpdateItemInput{
			TableName:                 aws.String(basics.TableName),
			Key:                       movie.GetKey(),
			ExpressionAttributeNames:  expr.Names(),
			ExpressionAttributeValues: expr.Values(),
			UpdateExpression:          expr.Update(),
			ReturnValues:              types.ReturnValueUpdatedNew,
		})
		if err != nil {
			log.Printf("Couldn't update movie %v. Here's why: %v\n", movie.Title, err)
		} else {
			err = attributevalue.UnmarshalMap(response.Attributes, &attributeMap)
			if err != nil {
				log.Printf("Couldn't unmarshall update response. Here's why: %v\n", err)
			}
		}
	}
	return attributeMap, err
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [UpdateItem](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.UpdateItem)을 참조하세요.

## 시나리오
<a name="scenarios"></a>

### PartiQL 문 배치를 사용하여 테이블 쿼리
<a name="dynamodb_Scenario_PartiQLBatch_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 여러 SELECT 문을 실행하여 항목 배치를 가져옵니다.
+ 여러 INSERT 문을 실행하여 항목 배치를 추가합니다.
+ 여러 UPDATE 문을 실행하여 항목 배치를 업데이트합니다.
+ 여러 DELETE 문을 실행하여 항목 배치를 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
테이블을 생성하고 PartiQL 쿼리 배치를 실행하는 시나리오를 실행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/dynamodb/actions"
)

// RunPartiQLBatchScenario shows you how to use the AWS SDK for Go
// to run batches of PartiQL statements to query a table that stores data about movies.
//
//   - Use batches of PartiQL statements to add, get, update, and delete data for
//     individual movies.
//
// This example creates an Amazon DynamoDB service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// This example creates and deletes a DynamoDB table to use during the scenario.
func RunPartiQLBatchScenario(ctx context.Context, sdkConfig aws.Config, tableName string) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Printf("Something went wrong with the demo.")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon DynamoDB PartiQL batch demo.")
	log.Println(strings.Repeat("-", 88))

	tableBasics := actions.TableBasics{
		DynamoDbClient: dynamodb.NewFromConfig(sdkConfig),
		TableName:      tableName,
	}
	runner := actions.PartiQLRunner{
		DynamoDbClient: dynamodb.NewFromConfig(sdkConfig),
		TableName:      tableName,
	}

	exists, err := tableBasics.TableExists(ctx)
	if err != nil {
		panic(err)
	}
	if !exists {
		log.Printf("Creating table %v...\n", tableName)
		_, err = tableBasics.CreateMovieTable(ctx)
		if err != nil {
			panic(err)
		} else {
			log.Printf("Created table %v.\n", tableName)
		}
	} else {
		log.Printf("Table %v already exists.\n", tableName)
	}
	log.Println(strings.Repeat("-", 88))

	currentYear, _, _ := time.Now().Date()
	customMovies := []actions.Movie{{
		Title: "House PartiQL",
		Year:  currentYear - 5,
		Info: map[string]interface{}{
			"plot":   "Wacky high jinks result from querying a mysterious database.",
			"rating": 8.5}}, {
		Title: "House PartiQL 2",
		Year:  currentYear - 3,
		Info: map[string]interface{}{
			"plot":   "Moderate high jinks result from querying another mysterious database.",
			"rating": 6.5}}, {
		Title: "House PartiQL 3",
		Year:  currentYear - 1,
		Info: map[string]interface{}{
			"plot":   "Tepid high jinks result from querying yet another mysterious database.",
			"rating": 2.5},
	},
	}

	log.Printf("Inserting a batch of movies into table '%v'.\n", tableName)
	err = runner.AddMovieBatch(ctx, customMovies)
	if err == nil {
		log.Printf("Added %v movies to the table.\n", len(customMovies))
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Getting data for a batch of movies.")
	movies, err := runner.GetMovieBatch(ctx, customMovies)
	if err == nil {
		for _, movie := range movies {
			log.Println(movie)
		}
	}
	log.Println(strings.Repeat("-", 88))

	newRatings := []float64{7.7, 4.4, 1.1}
	log.Println("Updating a batch of movies with new ratings.")
	err = runner.UpdateMovieBatch(ctx, customMovies, newRatings)
	if err == nil {
		log.Printf("Updated %v movies with new ratings.\n", len(customMovies))
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Getting projected data from the table to verify our update.")
	log.Println("Using a page size of 2 to demonstrate paging.")
	projections, err := runner.GetAllMovies(ctx, 2)
	if err == nil {
		log.Println("All movies:")
		for _, projection := range projections {
			log.Println(projection)
		}
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Deleting a batch of movies.")
	err = runner.DeleteMovieBatch(ctx, customMovies)
	if err == nil {
		log.Printf("Deleted %v movies.\n", len(customMovies))
	}

	err = tableBasics.DeleteTable(ctx)
	if err == nil {
		log.Printf("Deleted table %v.\n", tableBasics.TableName)
	}

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
PartiQL 문을 실행하는 구조체와 메서드를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// PartiQLRunner encapsulates the Amazon DynamoDB service actions used in the
// PartiQL examples. It contains a DynamoDB service client that is used to act on the
// specified table.
type PartiQLRunner struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// AddMovieBatch runs a batch of PartiQL INSERT statements to add multiple movies to the
// DynamoDB table.
func (runner PartiQLRunner) AddMovieBatch(ctx context.Context, movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year, movie.Info})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(fmt.Sprintf(
				"INSERT INTO \"%v\" VALUE {'title': ?, 'year': ?, 'info': ?}", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't insert a batch of items with PartiQL. Here's why: %v\n", err)
	}
	return err
}



// GetMovieBatch runs a batch of PartiQL SELECT statements to get multiple movies from
// the DynamoDB table by title and year.
func (runner PartiQLRunner) GetMovieBatch(ctx context.Context, movies []Movie) ([]Movie, error) {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("SELECT * FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	output, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	var outMovies []Movie
	if err != nil {
		log.Printf("Couldn't get a batch of items with PartiQL. Here's why: %v\n", err)
	} else {
		for _, response := range output.Responses {
			var movie Movie
			err = attributevalue.UnmarshalMap(response.Item, &movie)
			if err != nil {
				log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
			} else {
				outMovies = append(outMovies, movie)
			}
		}
	}
	return outMovies, err
}



// GetAllMovies runs a PartiQL SELECT statement to get all movies from the DynamoDB table.
// pageSize is not typically required and is used to show how to paginate the results.
// The results are projected to return only the title and rating of each movie.
func (runner PartiQLRunner) GetAllMovies(ctx context.Context, pageSize int32) ([]map[string]interface{}, error) {
	var output []map[string]interface{}
	var response *dynamodb.ExecuteStatementOutput
	var err error
	var nextToken *string
	for moreData := true; moreData; {
		response, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
			Statement: aws.String(
				fmt.Sprintf("SELECT title, info.rating FROM \"%v\"", runner.TableName)),
			Limit:     aws.Int32(pageSize),
			NextToken: nextToken,
		})
		if err != nil {
			log.Printf("Couldn't get movies. Here's why: %v\n", err)
			moreData = false
		} else {
			var pageOutput []map[string]interface{}
			err = attributevalue.UnmarshalListOfMaps(response.Items, &pageOutput)
			if err != nil {
				log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
			} else {
				log.Printf("Got a page of length %v.\n", len(response.Items))
				output = append(output, pageOutput...)
			}
			nextToken = response.NextToken
			moreData = nextToken != nil
		}
	}
	return output, err
}



// UpdateMovieBatch runs a batch of PartiQL UPDATE statements to update the rating of
// multiple movies that already exist in the DynamoDB table.
func (runner PartiQLRunner) UpdateMovieBatch(ctx context.Context, movies []Movie, ratings []float64) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{ratings[index], movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("UPDATE \"%v\" SET info.rating=? WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't update the batch of movies. Here's why: %v\n", err)
	}
	return err
}



// DeleteMovieBatch runs a batch of PartiQL DELETE statements to remove multiple movies
// from the DynamoDB table.
func (runner PartiQLRunner) DeleteMovieBatch(ctx context.Context, movies []Movie) error {
	statementRequests := make([]types.BatchStatementRequest, len(movies))
	for index, movie := range movies {
		params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
		if err != nil {
			panic(err)
		}
		statementRequests[index] = types.BatchStatementRequest{
			Statement: aws.String(
				fmt.Sprintf("DELETE FROM \"%v\" WHERE title=? AND year=?", runner.TableName)),
			Parameters: params,
		}
	}

	_, err := runner.DynamoDbClient.BatchExecuteStatement(ctx, &dynamodb.BatchExecuteStatementInput{
		Statements: statementRequests,
	})
	if err != nil {
		log.Printf("Couldn't delete the batch of movies. Here's why: %v\n", err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [BatchExecuteStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.BatchExecuteStatement)를 참조하세요.

### PartiQL을 사용하여 테이블 쿼리
<a name="dynamodb_Scenario_PartiQLSingle_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ SELECT 문을 실행하여 항목을 가져옵니다.
+ INSERT 문을 실행하여 항목을 추가합니다.
+ UPDATE 문을 실행하여 항목을 업데이트합니다.
+ DELETE 문을 실행하여 항목을 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/dynamodb#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
테이블을 생성하고 PartiQL 쿼리를 실행하는 시나리오를 실행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/dynamodb/actions"
)

// RunPartiQLSingleScenario shows you how to use the AWS SDK for Go
// to use PartiQL to query a table that stores data about movies.
//
// * Use PartiQL statements to add, get, update, and delete data for individual movies.
//
// This example creates an Amazon DynamoDB service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// This example creates and deletes a DynamoDB table to use during the scenario.
func RunPartiQLSingleScenario(ctx context.Context, sdkConfig aws.Config, tableName string) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Printf("Something went wrong with the demo.")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon DynamoDB PartiQL single action demo.")
	log.Println(strings.Repeat("-", 88))

	tableBasics := actions.TableBasics{
		DynamoDbClient: dynamodb.NewFromConfig(sdkConfig),
		TableName:      tableName,
	}
	runner := actions.PartiQLRunner{
		DynamoDbClient: dynamodb.NewFromConfig(sdkConfig),
		TableName:      tableName,
	}

	exists, err := tableBasics.TableExists(ctx)
	if err != nil {
		panic(err)
	}
	if !exists {
		log.Printf("Creating table %v...\n", tableName)
		_, err = tableBasics.CreateMovieTable(ctx)
		if err != nil {
			panic(err)
		} else {
			log.Printf("Created table %v.\n", tableName)
		}
	} else {
		log.Printf("Table %v already exists.\n", tableName)
	}
	log.Println(strings.Repeat("-", 88))

	currentYear, _, _ := time.Now().Date()
	customMovie := actions.Movie{
		Title: "24 Hour PartiQL People",
		Year:  currentYear,
		Info: map[string]interface{}{
			"plot":   "A group of data developers discover a new query language they can't stop using.",
			"rating": 9.9,
		},
	}

	log.Printf("Inserting movie '%v' released in %v.", customMovie.Title, customMovie.Year)
	err = runner.AddMovie(ctx, customMovie)
	if err == nil {
		log.Printf("Added %v to the movie table.\n", customMovie.Title)
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Getting data for movie '%v' released in %v.", customMovie.Title, customMovie.Year)
	movie, err := runner.GetMovie(ctx, customMovie.Title, customMovie.Year)
	if err == nil {
		log.Println(movie)
	}
	log.Println(strings.Repeat("-", 88))

	newRating := 6.6
	log.Printf("Updating movie '%v' with a rating of %v.", customMovie.Title, newRating)
	err = runner.UpdateMovie(ctx, customMovie, newRating)
	if err == nil {
		log.Printf("Updated %v with a new rating.\n", customMovie.Title)
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Getting data again to verify the update.")
	movie, err = runner.GetMovie(ctx, customMovie.Title, customMovie.Year)
	if err == nil {
		log.Println(movie)
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Deleting movie '%v'.\n", customMovie.Title)
	err = runner.DeleteMovie(ctx, customMovie)
	if err == nil {
		log.Printf("Deleted %v.\n", customMovie.Title)
	}

	err = tableBasics.DeleteTable(ctx)
	if err == nil {
		log.Printf("Deleted table %v.\n", tableBasics.TableName)
	}

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 Movie 구조체를 정의합니다.  

```
import (
	"archive/zip"
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"

	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// Movie encapsulates data about a movie. Title and Year are the composite primary key
// of the movie in Amazon DynamoDB. Title is the sort key, Year is the partition key,
// and Info is additional data.
type Movie struct {
	Title string                 `dynamodbav:"title"`
	Year  int                    `dynamodbav:"year"`
	Info  map[string]interface{} `dynamodbav:"info"`
}

// GetKey returns the composite primary key of the movie in a format that can be
// sent to DynamoDB.
func (movie Movie) GetKey() map[string]types.AttributeValue {
	title, err := attributevalue.Marshal(movie.Title)
	if err != nil {
		panic(err)
	}
	year, err := attributevalue.Marshal(movie.Year)
	if err != nil {
		panic(err)
	}
	return map[string]types.AttributeValue{"title": title, "year": year}
}

// String returns the title, year, rating, and plot of a movie, formatted for the example.
func (movie Movie) String() string {
	return fmt.Sprintf("%v\n\tReleased: %v\n\tRating: %v\n\tPlot: %v\n",
		movie.Title, movie.Year, movie.Info["rating"], movie.Info["plot"])
}
```
PartiQL 문을 실행하는 구조체와 메서드를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// PartiQLRunner encapsulates the Amazon DynamoDB service actions used in the
// PartiQL examples. It contains a DynamoDB service client that is used to act on the
// specified table.
type PartiQLRunner struct {
	DynamoDbClient *dynamodb.Client
	TableName      string
}



// AddMovie runs a PartiQL INSERT statement to add a movie to the DynamoDB table.
func (runner PartiQLRunner) AddMovie(ctx context.Context, movie Movie) error {
	params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year, movie.Info})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("INSERT INTO \"%v\" VALUE {'title': ?, 'year': ?, 'info': ?}",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't insert an item with PartiQL. Here's why: %v\n", err)
	}
	return err
}



// GetMovie runs a PartiQL SELECT statement to get a movie from the DynamoDB table by
// title and year.
func (runner PartiQLRunner) GetMovie(ctx context.Context, title string, year int) (Movie, error) {
	var movie Movie
	params, err := attributevalue.MarshalList([]interface{}{title, year})
	if err != nil {
		panic(err)
	}
	response, err := runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("SELECT * FROM \"%v\" WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't get info about %v. Here's why: %v\n", title, err)
	} else {
		err = attributevalue.UnmarshalMap(response.Items[0], &movie)
		if err != nil {
			log.Printf("Couldn't unmarshal response. Here's why: %v\n", err)
		}
	}
	return movie, err
}



// UpdateMovie runs a PartiQL UPDATE statement to update the rating of a movie that
// already exists in the DynamoDB table.
func (runner PartiQLRunner) UpdateMovie(ctx context.Context, movie Movie, rating float64) error {
	params, err := attributevalue.MarshalList([]interface{}{rating, movie.Title, movie.Year})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("UPDATE \"%v\" SET info.rating=? WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't update movie %v. Here's why: %v\n", movie.Title, err)
	}
	return err
}



// DeleteMovie runs a PartiQL DELETE statement to remove a movie from the DynamoDB table.
func (runner PartiQLRunner) DeleteMovie(ctx context.Context, movie Movie) error {
	params, err := attributevalue.MarshalList([]interface{}{movie.Title, movie.Year})
	if err != nil {
		panic(err)
	}
	_, err = runner.DynamoDbClient.ExecuteStatement(ctx, &dynamodb.ExecuteStatementInput{
		Statement: aws.String(
			fmt.Sprintf("DELETE FROM \"%v\" WHERE title=? AND year=?",
				runner.TableName)),
		Parameters: params,
	})
	if err != nil {
		log.Printf("Couldn't delete %v from the table. Here's why: %v\n", movie.Title, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ExecuteStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/dynamodb#Client.ExecuteStatement)를 참조하세요.

## 서버리스 예제
<a name="serverless_examples"></a>

### DynamoDB 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_DynamoDB_Lambda_go_2_topic"></a>

다음 코드 예제에서는 DynamoDB 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 DynamoDB 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 DynamoDB 이벤트 사용.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-lambda-go/events"
	"fmt"
)

func HandleRequest(ctx context.Context, event events.DynamoDBEvent) (*string, error) {
	if len(event.Records) == 0 {
		return nil, fmt.Errorf("received empty event")
	}

	for _, record := range event.Records {
	 	LogDynamoDBRecord(record)
	}

	message := fmt.Sprintf("Records processed: %d", len(event.Records))
	return &message, nil
}

func main() {
	lambda.Start(HandleRequest)
}

func LogDynamoDBRecord(record events.DynamoDBEventRecord){
	fmt.Println(record.EventID)
	fmt.Println(record.EventName)
	fmt.Printf("%+v\n", record.Change)
}
```

### DynamoDB 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_DynamoDB_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제에서는 DynamoDB 스트림에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda-with-batch-item-handling) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 DynamoDB 배치 항목 실패 보고.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

type BatchItemFailure struct {
	ItemIdentifier string `json:"ItemIdentifier"`
}

type BatchResult struct {
	BatchItemFailures []BatchItemFailure `json:"BatchItemFailures"`
}

func HandleRequest(ctx context.Context, event events.DynamoDBEvent) (*BatchResult, error) {
	var batchItemFailures []BatchItemFailure
	curRecordSequenceNumber := ""

	for _, record := range event.Records {
		// Process your record
		curRecordSequenceNumber = record.Change.SequenceNumber
	}

	if curRecordSequenceNumber != "" {
		batchItemFailures = append(batchItemFailures, BatchItemFailure{ItemIdentifier: curRecordSequenceNumber})
	}
	
	batchResult := BatchResult{
		BatchItemFailures: batchItemFailures,
	}

	return &batchResult, nil
}

func main() {
	lambda.Start(HandleRequest)
}
```

## AWS 커뮤니티 기여
<a name="aws_community_contributions"></a>

### 서버리스 애플리케이션 빌드 및 테스트
<a name="tributary-lite_serverless-application_go_2_topic"></a>

다음 코드 예제에서는 Lambda 및 DynamoDB와 함께 API 게이트웨이를 사용하여 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.

**SDK for Go V2**  
 Go SDK를 사용하여 Lambda 및 DynamoDB가 포함된 API 게이트웨이로 구성된 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.  
 전체 소스 코드와 설정 및 실행 방법에 대한 지침은 [GitHub](https://github.com/aws-samples/serverless-go-demo)에서 전체 예제를 참조하세요.  

**이 예제에서 사용되는 서비스**
+ API Gateway
+ DynamoDB
+ Lambda

# SDK for Go V2를 사용한 IAM 예제
<a name="go_2_iam_code_examples"></a>

다음 코드 예제에서는 IAM과 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)

## 시작하기
<a name="get_started"></a>

### Hello IAM
<a name="iam_Hello_go_2_topic"></a>

다음 코드 예제에서는 IAM 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/iam"
)

// main uses the AWS SDK for Go (v2) to create an AWS Identity and Access Management (IAM)
// client and list up to 10 policies in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	iamClient := iam.NewFromConfig(sdkConfig)
	const maxPols = 10
	fmt.Printf("Let's list up to %v policies for your account.\n", maxPols)
	result, err := iamClient.ListPolicies(ctx, &iam.ListPoliciesInput{
		MaxItems: aws.Int32(maxPols),
	})
	if err != nil {
		fmt.Printf("Couldn't list policies for your account. Here's why: %v\n", err)
		return
	}
	if len(result.Policies) == 0 {
		fmt.Println("You don't have any policies!")
	} else {
		for _, policy := range result.Policies {
			fmt.Printf("\t%v\n", *policy.PolicyName)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListPolicies](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListPolicies)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="iam_Scenario_CreateUserAssumeRole_go_2_topic"></a>

다음 코드 예제에서는 사용자를 생성하고 역할을 수임하는 방법을 보여줍니다.

**주의**  
보안 위험을 방지하려면 목적별 소프트웨어를 개발하거나 실제 데이터로 작업할 때 IAM 사용자를 인증에 사용하지 마세요. 대신 [AWS IAM Identity Center](https://docs.aws.amazon.com/singlesignon/latest/userguide/what-is.html)과 같은 보안 인증 공급자를 통한 페더레이션을 사용하십시오.
+ 권한이 없는 사용자를 생성합니다.
+ 계정에 대한 Amazon S3 버킷을 나열할 수 있는 권한을 부여하는 역할을 생성합니다.
+ 사용자가 역할을 수임할 수 있도록 정책을 추가합니다.
+ 역할을 수임하고 임시 자격 증명 정보를 사용하여 S3 버킷을 나열한 후 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"fmt"
	"log"
	"math/rand"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/credentials"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/sts"
	"github.com/aws/smithy-go"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/iam/actions"
)

// AssumeRoleScenario shows you how to use the AWS Identity and Access Management (IAM)
// service to perform the following actions:
//
//  1. Create a user who has no permissions.
//  2. Create a role that grants permission to list Amazon Simple Storage Service
//     (Amazon S3) buckets for the account.
//  3. Add a policy to let the user assume the role.
//  4. Try and fail to list buckets without permissions.
//  5. Assume the role and list S3 buckets using temporary credentials.
//  6. Delete the policy, role, and user.
type AssumeRoleScenario struct {
	sdkConfig      aws.Config
	accountWrapper actions.AccountWrapper
	policyWrapper  actions.PolicyWrapper
	roleWrapper    actions.RoleWrapper
	userWrapper    actions.UserWrapper
	questioner     demotools.IQuestioner
	helper         IScenarioHelper
	isTestRun      bool
}

// NewAssumeRoleScenario constructs an AssumeRoleScenario instance from a configuration.
// It uses the specified config to get an IAM client and create wrappers for the actions
// used in the scenario.
func NewAssumeRoleScenario(sdkConfig aws.Config, questioner demotools.IQuestioner,
	helper IScenarioHelper) AssumeRoleScenario {
	iamClient := iam.NewFromConfig(sdkConfig)
	return AssumeRoleScenario{
		sdkConfig:      sdkConfig,
		accountWrapper: actions.AccountWrapper{IamClient: iamClient},
		policyWrapper:  actions.PolicyWrapper{IamClient: iamClient},
		roleWrapper:    actions.RoleWrapper{IamClient: iamClient},
		userWrapper:    actions.UserWrapper{IamClient: iamClient},
		questioner:     questioner,
		helper:         helper,
	}
}

// addTestOptions appends the API options specified in the original configuration to
// another configuration. This is used to attach the middleware stubber to clients
// that are constructed during the scenario, which is needed for unit testing.
func (scenario AssumeRoleScenario) addTestOptions(scenarioConfig *aws.Config) {
	if scenario.isTestRun {
		scenarioConfig.APIOptions = append(scenarioConfig.APIOptions, scenario.sdkConfig.APIOptions...)
	}
}

// Run runs the interactive scenario.
func (scenario AssumeRoleScenario) Run(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong with the demo.\n")
			log.Println(r)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the AWS Identity and Access Management (IAM) assume role demo.")
	log.Println(strings.Repeat("-", 88))

	user := scenario.CreateUser(ctx)
	accessKey := scenario.CreateAccessKey(ctx, user)
	role := scenario.CreateRoleAndPolicies(ctx, user)
	noPermsConfig := scenario.ListBucketsWithoutPermissions(ctx, accessKey)
	scenario.ListBucketsWithAssumedRole(ctx, noPermsConfig, role)
	scenario.Cleanup(ctx, user, role)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}

// CreateUser creates a new IAM user. This user has no permissions.
func (scenario AssumeRoleScenario) CreateUser(ctx context.Context) *types.User {
	log.Println("Let's create an example user with no permissions.")
	userName := scenario.questioner.Ask("Enter a name for the example user:", demotools.NotEmpty{})
	user, err := scenario.userWrapper.GetUser(ctx, userName)
	if err != nil {
		panic(err)
	}
	if user == nil {
		user, err = scenario.userWrapper.CreateUser(ctx, userName)
		if err != nil {
			panic(err)
		}
		log.Printf("Created user %v.\n", *user.UserName)
	} else {
		log.Printf("User %v already exists.\n", *user.UserName)
	}
	log.Println(strings.Repeat("-", 88))
	return user
}

// CreateAccessKey creates an access key for the user.
func (scenario AssumeRoleScenario) CreateAccessKey(ctx context.Context, user *types.User) *types.AccessKey {
	accessKey, err := scenario.userWrapper.CreateAccessKeyPair(ctx, *user.UserName)
	if err != nil {
		panic(err)
	}
	log.Printf("Created access key %v for your user.", *accessKey.AccessKeyId)
	log.Println("Waiting a few seconds for your user to be ready...")
	scenario.helper.Pause(10)
	log.Println(strings.Repeat("-", 88))
	return accessKey
}

// CreateRoleAndPolicies creates a policy that grants permission to list S3 buckets for
// the current account and attaches the policy to a newly created role. It also adds an
// inline policy to the specified user that grants the user permission to assume the role.
func (scenario AssumeRoleScenario) CreateRoleAndPolicies(ctx context.Context, user *types.User) *types.Role {
	log.Println("Let's create a role and policy that grant permission to list S3 buckets.")
	scenario.questioner.Ask("Press Enter when you're ready.")
	listBucketsRole, err := scenario.roleWrapper.CreateRole(ctx, scenario.helper.GetName(), *user.Arn)
	if err != nil {
		panic(err)
	}
	log.Printf("Created role %v.\n", *listBucketsRole.RoleName)
	listBucketsPolicy, err := scenario.policyWrapper.CreatePolicy(
		ctx, scenario.helper.GetName(), []string{"s3:ListAllMyBuckets"}, "arn:aws:s3:::*")
	if err != nil {
		panic(err)
	}
	log.Printf("Created policy %v.\n", *listBucketsPolicy.PolicyName)
	err = scenario.roleWrapper.AttachRolePolicy(ctx, *listBucketsPolicy.Arn, *listBucketsRole.RoleName)
	if err != nil {
		panic(err)
	}
	log.Printf("Attached policy %v to role %v.\n", *listBucketsPolicy.PolicyName,
		*listBucketsRole.RoleName)
	err = scenario.userWrapper.CreateUserPolicy(ctx, *user.UserName, scenario.helper.GetName(),
		[]string{"sts:AssumeRole"}, *listBucketsRole.Arn)
	if err != nil {
		panic(err)
	}
	log.Printf("Created an inline policy for user %v that lets the user assume the role.\n",
		*user.UserName)
	log.Println("Let's give AWS a few seconds to propagate these new resources and connections...")
	scenario.helper.Pause(10)
	log.Println(strings.Repeat("-", 88))
	return listBucketsRole
}

// ListBucketsWithoutPermissions creates an Amazon S3 client from the user's access key
// credentials and tries to list buckets for the account. Because the user does not have
// permission to perform this action, the action fails.
func (scenario AssumeRoleScenario) ListBucketsWithoutPermissions(ctx context.Context, accessKey *types.AccessKey) *aws.Config {
	log.Println("Let's try to list buckets without permissions. This should return an AccessDenied error.")
	scenario.questioner.Ask("Press Enter when you're ready.")
	noPermsConfig, err := config.LoadDefaultConfig(ctx,
		config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
			*accessKey.AccessKeyId, *accessKey.SecretAccessKey, ""),
		))
	if err != nil {
		panic(err)
	}

	// Add test options if this is a test run. This is needed only for testing purposes.
	scenario.addTestOptions(&noPermsConfig)

	s3Client := s3.NewFromConfig(noPermsConfig)
	_, err = s3Client.ListBuckets(ctx, &s3.ListBucketsInput{})
	if err != nil {
		// The SDK for Go does not model the AccessDenied error, so check ErrorCode directly.
		var ae smithy.APIError
		if errors.As(err, &ae) {
			switch ae.ErrorCode() {
			case "AccessDenied":
				log.Println("Got AccessDenied error, which is the expected result because\n" +
					"the ListBuckets call was made without permissions.")
			default:
				log.Println("Expected AccessDenied, got something else.")
				panic(err)
			}
		}
	} else {
		log.Println("Expected AccessDenied error when calling ListBuckets without permissions,\n" +
			"but the call succeeded. Continuing the example anyway...")
	}
	log.Println(strings.Repeat("-", 88))
	return &noPermsConfig
}

// ListBucketsWithAssumedRole performs the following actions:
//
//  1. Creates an AWS Security Token Service (AWS STS) client from the config created from
//     the user's access key credentials.
//  2. Gets temporary credentials by assuming the role that grants permission to list the
//     buckets.
//  3. Creates an Amazon S3 client from the temporary credentials.
//  4. Lists buckets for the account. Because the temporary credentials are generated by
//     assuming the role that grants permission, the action succeeds.
func (scenario AssumeRoleScenario) ListBucketsWithAssumedRole(ctx context.Context, noPermsConfig *aws.Config, role *types.Role) {
	log.Println("Let's assume the role that grants permission to list buckets and try again.")
	scenario.questioner.Ask("Press Enter when you're ready.")
	stsClient := sts.NewFromConfig(*noPermsConfig)
	tempCredentials, err := stsClient.AssumeRole(ctx, &sts.AssumeRoleInput{
		RoleArn:         role.Arn,
		RoleSessionName: aws.String("AssumeRoleExampleSession"),
		DurationSeconds: aws.Int32(900),
	})
	if err != nil {
		log.Printf("Couldn't assume role %v.\n", *role.RoleName)
		panic(err)
	}
	log.Printf("Assumed role %v, got temporary credentials.\n", *role.RoleName)
	assumeRoleConfig, err := config.LoadDefaultConfig(ctx,
		config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
			*tempCredentials.Credentials.AccessKeyId,
			*tempCredentials.Credentials.SecretAccessKey,
			*tempCredentials.Credentials.SessionToken),
		),
	)
	if err != nil {
		panic(err)
	}

	// Add test options if this is a test run. This is needed only for testing purposes.
	scenario.addTestOptions(&assumeRoleConfig)

	s3Client := s3.NewFromConfig(assumeRoleConfig)
	result, err := s3Client.ListBuckets(ctx, &s3.ListBucketsInput{})
	if err != nil {
		log.Println("Couldn't list buckets with assumed role credentials.")
		panic(err)
	}
	log.Println("Successfully called ListBuckets with assumed role credentials, \n" +
		"here are some of them:")
	for i := 0; i < len(result.Buckets) && i < 5; i++ {
		log.Printf("\t%v\n", *result.Buckets[i].Name)
	}
	log.Println(strings.Repeat("-", 88))
}

// Cleanup deletes all resources created for the scenario.
func (scenario AssumeRoleScenario) Cleanup(ctx context.Context, user *types.User, role *types.Role) {
	if scenario.questioner.AskBool(
		"Do you want to delete the resources created for this example? (y/n)", "y",
	) {
		policies, err := scenario.roleWrapper.ListAttachedRolePolicies(ctx, *role.RoleName)
		if err != nil {
			panic(err)
		}
		for _, policy := range policies {
			err = scenario.roleWrapper.DetachRolePolicy(ctx, *role.RoleName, *policy.PolicyArn)
			if err != nil {
				panic(err)
			}
			err = scenario.policyWrapper.DeletePolicy(ctx, *policy.PolicyArn)
			if err != nil {
				panic(err)
			}
			log.Printf("Detached policy %v from role %v and deleted the policy.\n",
				*policy.PolicyName, *role.RoleName)
		}
		err = scenario.roleWrapper.DeleteRole(ctx, *role.RoleName)
		if err != nil {
			panic(err)
		}
		log.Printf("Deleted role %v.\n", *role.RoleName)

		userPols, err := scenario.userWrapper.ListUserPolicies(ctx, *user.UserName)
		if err != nil {
			panic(err)
		}
		for _, userPol := range userPols {
			err = scenario.userWrapper.DeleteUserPolicy(ctx, *user.UserName, userPol)
			if err != nil {
				panic(err)
			}
			log.Printf("Deleted policy %v from user %v.\n", userPol, *user.UserName)
		}
		keys, err := scenario.userWrapper.ListAccessKeys(ctx, *user.UserName)
		if err != nil {
			panic(err)
		}
		for _, key := range keys {
			err = scenario.userWrapper.DeleteAccessKey(ctx, *user.UserName, *key.AccessKeyId)
			if err != nil {
				panic(err)
			}
			log.Printf("Deleted access key %v from user %v.\n", *key.AccessKeyId, *user.UserName)
		}
		err = scenario.userWrapper.DeleteUser(ctx, *user.UserName)
		if err != nil {
			panic(err)
		}
		log.Printf("Deleted user %v.\n", *user.UserName)
		log.Println(strings.Repeat("-", 88))
	}

}

// IScenarioHelper abstracts input and wait functions from a scenario so that they
// can be mocked for unit testing.
type IScenarioHelper interface {
	GetName() string
	Pause(secs int)
}

const rMax = 100000

type ScenarioHelper struct {
	Prefix string
	Random *rand.Rand
}

// GetName returns a unique name formed of a prefix and a random number.
func (helper *ScenarioHelper) GetName() string {
	return fmt.Sprintf("%v%v", helper.Prefix, helper.Random.Intn(rMax))
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	time.Sleep(time.Duration(secs) * time.Second)
}
```
계정 작업을 래핑하는 구조체를 정의합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// AccountWrapper encapsulates AWS Identity and Access Management (IAM) account actions
// used in the examples.
// It contains an IAM service client that is used to perform account actions.
type AccountWrapper struct {
	IamClient *iam.Client
}



// GetAccountPasswordPolicy gets the account password policy for the current account.
// If no policy has been set, a NoSuchEntityException is error is returned.
func (wrapper AccountWrapper) GetAccountPasswordPolicy(ctx context.Context) (*types.PasswordPolicy, error) {
	var pwPolicy *types.PasswordPolicy
	result, err := wrapper.IamClient.GetAccountPasswordPolicy(ctx,
		&iam.GetAccountPasswordPolicyInput{})
	if err != nil {
		log.Printf("Couldn't get account password policy. Here's why: %v\n", err)
	} else {
		pwPolicy = result.PasswordPolicy
	}
	return pwPolicy, err
}



// ListSAMLProviders gets the SAML providers for the account.
func (wrapper AccountWrapper) ListSAMLProviders(ctx context.Context) ([]types.SAMLProviderListEntry, error) {
	var providers []types.SAMLProviderListEntry
	result, err := wrapper.IamClient.ListSAMLProviders(ctx, &iam.ListSAMLProvidersInput{})
	if err != nil {
		log.Printf("Couldn't list SAML providers. Here's why: %v\n", err)
	} else {
		providers = result.SAMLProviderList
	}
	return providers, err
}
```
정책 작업을 래핑하는 구조체를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// PolicyWrapper encapsulates AWS Identity and Access Management (IAM) policy actions
// used in the examples.
// It contains an IAM service client that is used to perform policy actions.
type PolicyWrapper struct {
	IamClient *iam.Client
}



// ListPolicies gets up to maxPolicies policies.
func (wrapper PolicyWrapper) ListPolicies(ctx context.Context, maxPolicies int32) ([]types.Policy, error) {
	var policies []types.Policy
	result, err := wrapper.IamClient.ListPolicies(ctx, &iam.ListPoliciesInput{
		MaxItems: aws.Int32(maxPolicies),
	})
	if err != nil {
		log.Printf("Couldn't list policies. Here's why: %v\n", err)
	} else {
		policies = result.Policies
	}
	return policies, err
}



// PolicyDocument defines a policy document as a Go struct that can be serialized
// to JSON.
type PolicyDocument struct {
	Version   string
	Statement []PolicyStatement
}

// PolicyStatement defines a statement in a policy document.
type PolicyStatement struct {
	Effect    string
	Action    []string
	Principal map[string]string `json:",omitempty"`
	Resource  *string           `json:",omitempty"`
}

// CreatePolicy creates a policy that grants a list of actions to the specified resource.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper PolicyWrapper) CreatePolicy(ctx context.Context, policyName string, actions []string,
	resourceArn string) (*types.Policy, error) {
	var policy *types.Policy
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:   "Allow",
			Action:   actions,
			Resource: aws.String(resourceArn),
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document for %v. Here's why: %v\n", resourceArn, err)
		return nil, err
	}
	result, err := wrapper.IamClient.CreatePolicy(ctx, &iam.CreatePolicyInput{
		PolicyDocument: aws.String(string(policyBytes)),
		PolicyName:     aws.String(policyName),
	})
	if err != nil {
		log.Printf("Couldn't create policy %v. Here's why: %v\n", policyName, err)
	} else {
		policy = result.Policy
	}
	return policy, err
}



// GetPolicy gets data about a policy.
func (wrapper PolicyWrapper) GetPolicy(ctx context.Context, policyArn string) (*types.Policy, error) {
	var policy *types.Policy
	result, err := wrapper.IamClient.GetPolicy(ctx, &iam.GetPolicyInput{
		PolicyArn: aws.String(policyArn),
	})
	if err != nil {
		log.Printf("Couldn't get policy %v. Here's why: %v\n", policyArn, err)
	} else {
		policy = result.Policy
	}
	return policy, err
}



// DeletePolicy deletes a policy.
func (wrapper PolicyWrapper) DeletePolicy(ctx context.Context, policyArn string) error {
	_, err := wrapper.IamClient.DeletePolicy(ctx, &iam.DeletePolicyInput{
		PolicyArn: aws.String(policyArn),
	})
	if err != nil {
		log.Printf("Couldn't delete policy %v. Here's why: %v\n", policyArn, err)
	}
	return err
}
```
역할 작업을 래핑하는 구조체를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// ListRoles gets up to maxRoles roles.
func (wrapper RoleWrapper) ListRoles(ctx context.Context, maxRoles int32) ([]types.Role, error) {
	var roles []types.Role
	result, err := wrapper.IamClient.ListRoles(ctx,
		&iam.ListRolesInput{MaxItems: aws.Int32(maxRoles)},
	)
	if err != nil {
		log.Printf("Couldn't list roles. Here's why: %v\n", err)
	} else {
		roles = result.Roles
	}
	return roles, err
}



// CreateRole creates a role that trusts a specified user. The trusted user can assume
// the role to acquire its permissions.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper RoleWrapper) CreateRole(ctx context.Context, roleName string, trustedUserArn string) (*types.Role, error) {
	var role *types.Role
	trustPolicy := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:    "Allow",
			Principal: map[string]string{"AWS": trustedUserArn},
			Action:    []string{"sts:AssumeRole"},
		}},
	}
	policyBytes, err := json.Marshal(trustPolicy)
	if err != nil {
		log.Printf("Couldn't create trust policy for %v. Here's why: %v\n", trustedUserArn, err)
		return nil, err
	}
	result, err := wrapper.IamClient.CreateRole(ctx, &iam.CreateRoleInput{
		AssumeRolePolicyDocument: aws.String(string(policyBytes)),
		RoleName:                 aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't create role %v. Here's why: %v\n", roleName, err)
	} else {
		role = result.Role
	}
	return role, err
}



// GetRole gets data about a role.
func (wrapper RoleWrapper) GetRole(ctx context.Context, roleName string) (*types.Role, error) {
	var role *types.Role
	result, err := wrapper.IamClient.GetRole(ctx,
		&iam.GetRoleInput{RoleName: aws.String(roleName)})
	if err != nil {
		log.Printf("Couldn't get role %v. Here's why: %v\n", roleName, err)
	} else {
		role = result.Role
	}
	return role, err
}



// CreateServiceLinkedRole creates a service-linked role that is owned by the specified service.
func (wrapper RoleWrapper) CreateServiceLinkedRole(ctx context.Context, serviceName string, description string) (
	*types.Role, error) {
	var role *types.Role
	result, err := wrapper.IamClient.CreateServiceLinkedRole(ctx, &iam.CreateServiceLinkedRoleInput{
		AWSServiceName: aws.String(serviceName),
		Description:    aws.String(description),
	})
	if err != nil {
		log.Printf("Couldn't create service-linked role %v. Here's why: %v\n", serviceName, err)
	} else {
		role = result.Role
	}
	return role, err
}



// DeleteServiceLinkedRole deletes a service-linked role.
func (wrapper RoleWrapper) DeleteServiceLinkedRole(ctx context.Context, roleName string) error {
	_, err := wrapper.IamClient.DeleteServiceLinkedRole(ctx, &iam.DeleteServiceLinkedRoleInput{
		RoleName: aws.String(roleName)},
	)
	if err != nil {
		log.Printf("Couldn't delete service-linked role %v. Here's why: %v\n", roleName, err)
	}
	return err
}



// AttachRolePolicy attaches a policy to a role.
func (wrapper RoleWrapper) AttachRolePolicy(ctx context.Context, policyArn string, roleName string) error {
	_, err := wrapper.IamClient.AttachRolePolicy(ctx, &iam.AttachRolePolicyInput{
		PolicyArn: aws.String(policyArn),
		RoleName:  aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't attach policy %v to role %v. Here's why: %v\n", policyArn, roleName, err)
	}
	return err
}



// ListAttachedRolePolicies lists the policies that are attached to the specified role.
func (wrapper RoleWrapper) ListAttachedRolePolicies(ctx context.Context, roleName string) ([]types.AttachedPolicy, error) {
	var policies []types.AttachedPolicy
	result, err := wrapper.IamClient.ListAttachedRolePolicies(ctx, &iam.ListAttachedRolePoliciesInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't list attached policies for role %v. Here's why: %v\n", roleName, err)
	} else {
		policies = result.AttachedPolicies
	}
	return policies, err
}



// DetachRolePolicy detaches a policy from a role.
func (wrapper RoleWrapper) DetachRolePolicy(ctx context.Context, roleName string, policyArn string) error {
	_, err := wrapper.IamClient.DetachRolePolicy(ctx, &iam.DetachRolePolicyInput{
		PolicyArn: aws.String(policyArn),
		RoleName:  aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't detach policy from role %v. Here's why: %v\n", roleName, err)
	}
	return err
}



// ListRolePolicies lists the inline policies for a role.
func (wrapper RoleWrapper) ListRolePolicies(ctx context.Context, roleName string) ([]string, error) {
	var policies []string
	result, err := wrapper.IamClient.ListRolePolicies(ctx, &iam.ListRolePoliciesInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't list policies for role %v. Here's why: %v\n", roleName, err)
	} else {
		policies = result.PolicyNames
	}
	return policies, err
}



// DeleteRole deletes a role. All attached policies must be detached before a
// role can be deleted.
func (wrapper RoleWrapper) DeleteRole(ctx context.Context, roleName string) error {
	_, err := wrapper.IamClient.DeleteRole(ctx, &iam.DeleteRoleInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't delete role %v. Here's why: %v\n", roleName, err)
	}
	return err
}
```
사용자 작업을 래핑하는 구조체를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// ListUsers gets up to maxUsers number of users.
func (wrapper UserWrapper) ListUsers(ctx context.Context, maxUsers int32) ([]types.User, error) {
	var users []types.User
	result, err := wrapper.IamClient.ListUsers(ctx, &iam.ListUsersInput{
		MaxItems: aws.Int32(maxUsers),
	})
	if err != nil {
		log.Printf("Couldn't list users. Here's why: %v\n", err)
	} else {
		users = result.Users
	}
	return users, err
}



// GetUser gets data about a user.
func (wrapper UserWrapper) GetUser(ctx context.Context, userName string) (*types.User, error) {
	var user *types.User
	result, err := wrapper.IamClient.GetUser(ctx, &iam.GetUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		var apiError smithy.APIError
		if errors.As(err, &apiError) {
			switch apiError.(type) {
			case *types.NoSuchEntityException:
				log.Printf("User %v does not exist.\n", userName)
				err = nil
			default:
				log.Printf("Couldn't get user %v. Here's why: %v\n", userName, err)
			}
		}
	} else {
		user = result.User
	}
	return user, err
}



// CreateUser creates a new user with the specified name.
func (wrapper UserWrapper) CreateUser(ctx context.Context, userName string) (*types.User, error) {
	var user *types.User
	result, err := wrapper.IamClient.CreateUser(ctx, &iam.CreateUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
	} else {
		user = result.User
	}
	return user, err
}



// CreateUserPolicy adds an inline policy to a user. This example creates a policy that
// grants a list of actions on a specified role.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper UserWrapper) CreateUserPolicy(ctx context.Context, userName string, policyName string, actions []string,
	roleArn string) error {
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:   "Allow",
			Action:   actions,
			Resource: aws.String(roleArn),
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document for %v. Here's why: %v\n", roleArn, err)
		return err
	}
	_, err = wrapper.IamClient.PutUserPolicy(ctx, &iam.PutUserPolicyInput{
		PolicyDocument: aws.String(string(policyBytes)),
		PolicyName:     aws.String(policyName),
		UserName:       aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't create policy for user %v. Here's why: %v\n", userName, err)
	}
	return err
}



// ListUserPolicies lists the inline policies for the specified user.
func (wrapper UserWrapper) ListUserPolicies(ctx context.Context, userName string) ([]string, error) {
	var policies []string
	result, err := wrapper.IamClient.ListUserPolicies(ctx, &iam.ListUserPoliciesInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't list policies for user %v. Here's why: %v\n", userName, err)
	} else {
		policies = result.PolicyNames
	}
	return policies, err
}



// DeleteUserPolicy deletes an inline policy from a user.
func (wrapper UserWrapper) DeleteUserPolicy(ctx context.Context, userName string, policyName string) error {
	_, err := wrapper.IamClient.DeleteUserPolicy(ctx, &iam.DeleteUserPolicyInput{
		PolicyName: aws.String(policyName),
		UserName:   aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete policy from user %v. Here's why: %v\n", userName, err)
	}
	return err
}



// DeleteUser deletes a user.
func (wrapper UserWrapper) DeleteUser(ctx context.Context, userName string) error {
	_, err := wrapper.IamClient.DeleteUser(ctx, &iam.DeleteUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete user %v. Here's why: %v\n", userName, err)
	}
	return err
}



// CreateAccessKeyPair creates an access key for a user. The returned access key contains
// the ID and secret credentials needed to use the key.
func (wrapper UserWrapper) CreateAccessKeyPair(ctx context.Context, userName string) (*types.AccessKey, error) {
	var key *types.AccessKey
	result, err := wrapper.IamClient.CreateAccessKey(ctx, &iam.CreateAccessKeyInput{
		UserName: aws.String(userName)})
	if err != nil {
		log.Printf("Couldn't create access key pair for user %v. Here's why: %v\n", userName, err)
	} else {
		key = result.AccessKey
	}
	return key, err
}



// DeleteAccessKey deletes an access key from a user.
func (wrapper UserWrapper) DeleteAccessKey(ctx context.Context, userName string, keyId string) error {
	_, err := wrapper.IamClient.DeleteAccessKey(ctx, &iam.DeleteAccessKeyInput{
		AccessKeyId: aws.String(keyId),
		UserName:    aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete access key %v. Here's why: %v\n", keyId, err)
	}
	return err
}



// ListAccessKeys lists the access keys for the specified user.
func (wrapper UserWrapper) ListAccessKeys(ctx context.Context, userName string) ([]types.AccessKeyMetadata, error) {
	var keys []types.AccessKeyMetadata
	result, err := wrapper.IamClient.ListAccessKeys(ctx, &iam.ListAccessKeysInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't list access keys for user %v. Here's why: %v\n", userName, err)
	} else {
		keys = result.AccessKeyMetadata
	}
	return keys, err
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하십시오.
  + [AttachRolePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.AttachRolePolicy)
  + [CreateAccessKey](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateAccessKey)
  + [CreatePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreatePolicy)
  + [CreateRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateRole)
  + [CreateUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateUser)
  + [DeleteAccessKey](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteAccessKey)
  + [DeletePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeletePolicy)
  + [DeleteRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteRole)
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteUser)
  + [DeleteUserPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteUserPolicy)
  + [DetachRolePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DetachRolePolicy)
  + [PutUserPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.PutUserPolicy)

## 작업
<a name="actions"></a>

### `AttachRolePolicy`
<a name="iam_AttachRolePolicy_go_2_topic"></a>

다음 코드 예시는 `AttachRolePolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// AttachRolePolicy attaches a policy to a role.
func (wrapper RoleWrapper) AttachRolePolicy(ctx context.Context, policyArn string, roleName string) error {
	_, err := wrapper.IamClient.AttachRolePolicy(ctx, &iam.AttachRolePolicyInput{
		PolicyArn: aws.String(policyArn),
		RoleName:  aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't attach policy %v to role %v. Here's why: %v\n", policyArn, roleName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [AttachRolePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.AttachRolePolicy)를 참조하세요.

### `CreateAccessKey`
<a name="iam_CreateAccessKey_go_2_topic"></a>

다음 코드 예시는 `CreateAccessKey`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// CreateAccessKeyPair creates an access key for a user. The returned access key contains
// the ID and secret credentials needed to use the key.
func (wrapper UserWrapper) CreateAccessKeyPair(ctx context.Context, userName string) (*types.AccessKey, error) {
	var key *types.AccessKey
	result, err := wrapper.IamClient.CreateAccessKey(ctx, &iam.CreateAccessKeyInput{
		UserName: aws.String(userName)})
	if err != nil {
		log.Printf("Couldn't create access key pair for user %v. Here's why: %v\n", userName, err)
	} else {
		key = result.AccessKey
	}
	return key, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateAccessKey](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateAccessKey)를 참조하세요.

### `CreatePolicy`
<a name="iam_CreatePolicy_go_2_topic"></a>

다음 코드 예시는 `CreatePolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// PolicyWrapper encapsulates AWS Identity and Access Management (IAM) policy actions
// used in the examples.
// It contains an IAM service client that is used to perform policy actions.
type PolicyWrapper struct {
	IamClient *iam.Client
}



// PolicyDocument defines a policy document as a Go struct that can be serialized
// to JSON.
type PolicyDocument struct {
	Version   string
	Statement []PolicyStatement
}

// PolicyStatement defines a statement in a policy document.
type PolicyStatement struct {
	Effect    string
	Action    []string
	Principal map[string]string `json:",omitempty"`
	Resource  *string           `json:",omitempty"`
}

// CreatePolicy creates a policy that grants a list of actions to the specified resource.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper PolicyWrapper) CreatePolicy(ctx context.Context, policyName string, actions []string,
	resourceArn string) (*types.Policy, error) {
	var policy *types.Policy
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:   "Allow",
			Action:   actions,
			Resource: aws.String(resourceArn),
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document for %v. Here's why: %v\n", resourceArn, err)
		return nil, err
	}
	result, err := wrapper.IamClient.CreatePolicy(ctx, &iam.CreatePolicyInput{
		PolicyDocument: aws.String(string(policyBytes)),
		PolicyName:     aws.String(policyName),
	})
	if err != nil {
		log.Printf("Couldn't create policy %v. Here's why: %v\n", policyName, err)
	} else {
		policy = result.Policy
	}
	return policy, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreatePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreatePolicy)를 참조하세요.

### `CreateRole`
<a name="iam_CreateRole_go_2_topic"></a>

다음 코드 예시는 `CreateRole`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// CreateRole creates a role that trusts a specified user. The trusted user can assume
// the role to acquire its permissions.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper RoleWrapper) CreateRole(ctx context.Context, roleName string, trustedUserArn string) (*types.Role, error) {
	var role *types.Role
	trustPolicy := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:    "Allow",
			Principal: map[string]string{"AWS": trustedUserArn},
			Action:    []string{"sts:AssumeRole"},
		}},
	}
	policyBytes, err := json.Marshal(trustPolicy)
	if err != nil {
		log.Printf("Couldn't create trust policy for %v. Here's why: %v\n", trustedUserArn, err)
		return nil, err
	}
	result, err := wrapper.IamClient.CreateRole(ctx, &iam.CreateRoleInput{
		AssumeRolePolicyDocument: aws.String(string(policyBytes)),
		RoleName:                 aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't create role %v. Here's why: %v\n", roleName, err)
	} else {
		role = result.Role
	}
	return role, err
}
```
+  API 세부 정보는 [AWS SDK for Go API 참조](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateRole)의 *CreateRole*을 참조하세요.

### `CreateServiceLinkedRole`
<a name="iam_CreateServiceLinkedRole_go_2_topic"></a>

다음 코드 예시는 `CreateServiceLinkedRole`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// CreateServiceLinkedRole creates a service-linked role that is owned by the specified service.
func (wrapper RoleWrapper) CreateServiceLinkedRole(ctx context.Context, serviceName string, description string) (
	*types.Role, error) {
	var role *types.Role
	result, err := wrapper.IamClient.CreateServiceLinkedRole(ctx, &iam.CreateServiceLinkedRoleInput{
		AWSServiceName: aws.String(serviceName),
		Description:    aws.String(description),
	})
	if err != nil {
		log.Printf("Couldn't create service-linked role %v. Here's why: %v\n", serviceName, err)
	} else {
		role = result.Role
	}
	return role, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateServiceLinkedRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateServiceLinkedRole)을 참조하세요.

### `CreateUser`
<a name="iam_CreateUser_go_2_topic"></a>

다음 코드 예시는 `CreateUser`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// CreateUser creates a new user with the specified name.
func (wrapper UserWrapper) CreateUser(ctx context.Context, userName string) (*types.User, error) {
	var user *types.User
	result, err := wrapper.IamClient.CreateUser(ctx, &iam.CreateUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
	} else {
		user = result.User
	}
	return user, err
}
```
+  API 세부 정보는 [AWS SDK for Go API 참조](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.CreateUser)의 *CreateUser*를 참조하세요.

### `DeleteAccessKey`
<a name="iam_DeleteAccessKey_go_2_topic"></a>

다음 코드 예시는 `DeleteAccessKey`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// DeleteAccessKey deletes an access key from a user.
func (wrapper UserWrapper) DeleteAccessKey(ctx context.Context, userName string, keyId string) error {
	_, err := wrapper.IamClient.DeleteAccessKey(ctx, &iam.DeleteAccessKeyInput{
		AccessKeyId: aws.String(keyId),
		UserName:    aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete access key %v. Here's why: %v\n", keyId, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteAccessKey](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteAccessKey)를 참조하세요.

### `DeletePolicy`
<a name="iam_DeletePolicy_go_2_topic"></a>

다음 코드 예시는 `DeletePolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// PolicyWrapper encapsulates AWS Identity and Access Management (IAM) policy actions
// used in the examples.
// It contains an IAM service client that is used to perform policy actions.
type PolicyWrapper struct {
	IamClient *iam.Client
}



// DeletePolicy deletes a policy.
func (wrapper PolicyWrapper) DeletePolicy(ctx context.Context, policyArn string) error {
	_, err := wrapper.IamClient.DeletePolicy(ctx, &iam.DeletePolicyInput{
		PolicyArn: aws.String(policyArn),
	})
	if err != nil {
		log.Printf("Couldn't delete policy %v. Here's why: %v\n", policyArn, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeletePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeletePolicy)를 참조하세요.

### `DeleteRole`
<a name="iam_DeleteRole_go_2_topic"></a>

다음 코드 예시는 `DeleteRole`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// DeleteRole deletes a role. All attached policies must be detached before a
// role can be deleted.
func (wrapper RoleWrapper) DeleteRole(ctx context.Context, roleName string) error {
	_, err := wrapper.IamClient.DeleteRole(ctx, &iam.DeleteRoleInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't delete role %v. Here's why: %v\n", roleName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteRole)을 참조하세요.

### `DeleteServiceLinkedRole`
<a name="iam_DeleteServiceLinkedRole_go_2_topic"></a>

다음 코드 예시는 `DeleteServiceLinkedRole`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// DeleteServiceLinkedRole deletes a service-linked role.
func (wrapper RoleWrapper) DeleteServiceLinkedRole(ctx context.Context, roleName string) error {
	_, err := wrapper.IamClient.DeleteServiceLinkedRole(ctx, &iam.DeleteServiceLinkedRoleInput{
		RoleName: aws.String(roleName)},
	)
	if err != nil {
		log.Printf("Couldn't delete service-linked role %v. Here's why: %v\n", roleName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteServiceLinkedRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteServiceLinkedRole)을 참조하세요.

### `DeleteUser`
<a name="iam_DeleteUser_go_2_topic"></a>

다음 코드 예시는 `DeleteUser`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// DeleteUser deletes a user.
func (wrapper UserWrapper) DeleteUser(ctx context.Context, userName string) error {
	_, err := wrapper.IamClient.DeleteUser(ctx, &iam.DeleteUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete user %v. Here's why: %v\n", userName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteUser)를 참조하세요.

### `DeleteUserPolicy`
<a name="iam_DeleteUserPolicy_go_2_topic"></a>

다음 코드 예시는 `DeleteUserPolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// DeleteUserPolicy deletes an inline policy from a user.
func (wrapper UserWrapper) DeleteUserPolicy(ctx context.Context, userName string, policyName string) error {
	_, err := wrapper.IamClient.DeleteUserPolicy(ctx, &iam.DeleteUserPolicyInput{
		PolicyName: aws.String(policyName),
		UserName:   aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't delete policy from user %v. Here's why: %v\n", userName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteUserPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DeleteUserPolicy)를 참조하세요.

### `DetachRolePolicy`
<a name="iam_DetachRolePolicy_go_2_topic"></a>

다음 코드 예시는 `DetachRolePolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// DetachRolePolicy detaches a policy from a role.
func (wrapper RoleWrapper) DetachRolePolicy(ctx context.Context, roleName string, policyArn string) error {
	_, err := wrapper.IamClient.DetachRolePolicy(ctx, &iam.DetachRolePolicyInput{
		PolicyArn: aws.String(policyArn),
		RoleName:  aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't detach policy from role %v. Here's why: %v\n", roleName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DetachRolePolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.DetachRolePolicy)를 참조하세요.

### `GetAccountPasswordPolicy`
<a name="iam_GetAccountPasswordPolicy_go_2_topic"></a>

다음 코드 예시는 `GetAccountPasswordPolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// AccountWrapper encapsulates AWS Identity and Access Management (IAM) account actions
// used in the examples.
// It contains an IAM service client that is used to perform account actions.
type AccountWrapper struct {
	IamClient *iam.Client
}



// GetAccountPasswordPolicy gets the account password policy for the current account.
// If no policy has been set, a NoSuchEntityException is error is returned.
func (wrapper AccountWrapper) GetAccountPasswordPolicy(ctx context.Context) (*types.PasswordPolicy, error) {
	var pwPolicy *types.PasswordPolicy
	result, err := wrapper.IamClient.GetAccountPasswordPolicy(ctx,
		&iam.GetAccountPasswordPolicyInput{})
	if err != nil {
		log.Printf("Couldn't get account password policy. Here's why: %v\n", err)
	} else {
		pwPolicy = result.PasswordPolicy
	}
	return pwPolicy, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetAccountPasswordPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.GetAccountPasswordPolicy)를 참조하세요.

### `GetPolicy`
<a name="iam_GetPolicy_go_2_topic"></a>

다음 코드 예시는 `GetPolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// PolicyWrapper encapsulates AWS Identity and Access Management (IAM) policy actions
// used in the examples.
// It contains an IAM service client that is used to perform policy actions.
type PolicyWrapper struct {
	IamClient *iam.Client
}



// GetPolicy gets data about a policy.
func (wrapper PolicyWrapper) GetPolicy(ctx context.Context, policyArn string) (*types.Policy, error) {
	var policy *types.Policy
	result, err := wrapper.IamClient.GetPolicy(ctx, &iam.GetPolicyInput{
		PolicyArn: aws.String(policyArn),
	})
	if err != nil {
		log.Printf("Couldn't get policy %v. Here's why: %v\n", policyArn, err)
	} else {
		policy = result.Policy
	}
	return policy, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.GetPolicy)를 참조하세요.

### `GetRole`
<a name="iam_GetRole_go_2_topic"></a>

다음 코드 예시는 `GetRole`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// GetRole gets data about a role.
func (wrapper RoleWrapper) GetRole(ctx context.Context, roleName string) (*types.Role, error) {
	var role *types.Role
	result, err := wrapper.IamClient.GetRole(ctx,
		&iam.GetRoleInput{RoleName: aws.String(roleName)})
	if err != nil {
		log.Printf("Couldn't get role %v. Here's why: %v\n", roleName, err)
	} else {
		role = result.Role
	}
	return role, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetRole](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.GetRole)을 참조하세요.

### `GetUser`
<a name="iam_GetUser_go_2_topic"></a>

다음 코드 예시는 `GetUser`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// GetUser gets data about a user.
func (wrapper UserWrapper) GetUser(ctx context.Context, userName string) (*types.User, error) {
	var user *types.User
	result, err := wrapper.IamClient.GetUser(ctx, &iam.GetUserInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		var apiError smithy.APIError
		if errors.As(err, &apiError) {
			switch apiError.(type) {
			case *types.NoSuchEntityException:
				log.Printf("User %v does not exist.\n", userName)
				err = nil
			default:
				log.Printf("Couldn't get user %v. Here's why: %v\n", userName, err)
			}
		}
	} else {
		user = result.User
	}
	return user, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.GetUser)을 참조하세요.

### `ListAccessKeys`
<a name="iam_ListAccessKeys_go_2_topic"></a>

다음 코드 예시는 `ListAccessKeys`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// ListAccessKeys lists the access keys for the specified user.
func (wrapper UserWrapper) ListAccessKeys(ctx context.Context, userName string) ([]types.AccessKeyMetadata, error) {
	var keys []types.AccessKeyMetadata
	result, err := wrapper.IamClient.ListAccessKeys(ctx, &iam.ListAccessKeysInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't list access keys for user %v. Here's why: %v\n", userName, err)
	} else {
		keys = result.AccessKeyMetadata
	}
	return keys, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListAccessKeys](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListAccessKeys)를 참조하세요.

### `ListAttachedRolePolicies`
<a name="iam_ListAttachedRolePolicies_go_2_topic"></a>

다음 코드 예시는 `ListAttachedRolePolicies`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// ListAttachedRolePolicies lists the policies that are attached to the specified role.
func (wrapper RoleWrapper) ListAttachedRolePolicies(ctx context.Context, roleName string) ([]types.AttachedPolicy, error) {
	var policies []types.AttachedPolicy
	result, err := wrapper.IamClient.ListAttachedRolePolicies(ctx, &iam.ListAttachedRolePoliciesInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't list attached policies for role %v. Here's why: %v\n", roleName, err)
	} else {
		policies = result.AttachedPolicies
	}
	return policies, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListAttachedRolePolicies](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListAttachedRolePolicies)를 참조하세요.

### `ListGroups`
<a name="iam_ListGroups_go_2_topic"></a>

다음 코드 예시는 `ListGroups`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// GroupWrapper encapsulates AWS Identity and Access Management (IAM) group actions
// used in the examples.
// It contains an IAM service client that is used to perform group actions.
type GroupWrapper struct {
	IamClient *iam.Client
}



// ListGroups lists up to maxGroups number of groups.
func (wrapper GroupWrapper) ListGroups(ctx context.Context, maxGroups int32) ([]types.Group, error) {
	var groups []types.Group
	result, err := wrapper.IamClient.ListGroups(ctx, &iam.ListGroupsInput{
		MaxItems: aws.Int32(maxGroups),
	})
	if err != nil {
		log.Printf("Couldn't list groups. Here's why: %v\n", err)
	} else {
		groups = result.Groups
	}
	return groups, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListGroups](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListGroups)를 참조하세요.

### `ListPolicies`
<a name="iam_ListPolicies_go_2_topic"></a>

다음 코드 예시는 `ListPolicies`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// PolicyWrapper encapsulates AWS Identity and Access Management (IAM) policy actions
// used in the examples.
// It contains an IAM service client that is used to perform policy actions.
type PolicyWrapper struct {
	IamClient *iam.Client
}



// ListPolicies gets up to maxPolicies policies.
func (wrapper PolicyWrapper) ListPolicies(ctx context.Context, maxPolicies int32) ([]types.Policy, error) {
	var policies []types.Policy
	result, err := wrapper.IamClient.ListPolicies(ctx, &iam.ListPoliciesInput{
		MaxItems: aws.Int32(maxPolicies),
	})
	if err != nil {
		log.Printf("Couldn't list policies. Here's why: %v\n", err)
	} else {
		policies = result.Policies
	}
	return policies, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListPolicies](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListPolicies)를 참조하세요.

### `ListRolePolicies`
<a name="iam_ListRolePolicies_go_2_topic"></a>

다음 코드 예시는 `ListRolePolicies`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// ListRolePolicies lists the inline policies for a role.
func (wrapper RoleWrapper) ListRolePolicies(ctx context.Context, roleName string) ([]string, error) {
	var policies []string
	result, err := wrapper.IamClient.ListRolePolicies(ctx, &iam.ListRolePoliciesInput{
		RoleName: aws.String(roleName),
	})
	if err != nil {
		log.Printf("Couldn't list policies for role %v. Here's why: %v\n", roleName, err)
	} else {
		policies = result.PolicyNames
	}
	return policies, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListRolePolicies](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListRolePolicies)를 참조하세요.

### `ListRoles`
<a name="iam_ListRoles_go_2_topic"></a>

다음 코드 예시는 `ListRoles`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// RoleWrapper encapsulates AWS Identity and Access Management (IAM) role actions
// used in the examples.
// It contains an IAM service client that is used to perform role actions.
type RoleWrapper struct {
	IamClient *iam.Client
}



// ListRoles gets up to maxRoles roles.
func (wrapper RoleWrapper) ListRoles(ctx context.Context, maxRoles int32) ([]types.Role, error) {
	var roles []types.Role
	result, err := wrapper.IamClient.ListRoles(ctx,
		&iam.ListRolesInput{MaxItems: aws.Int32(maxRoles)},
	)
	if err != nil {
		log.Printf("Couldn't list roles. Here's why: %v\n", err)
	} else {
		roles = result.Roles
	}
	return roles, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListRoles](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListRoles)를 참조하세요.

### `ListSAMLProviders`
<a name="iam_ListSAMLProviders_go_2_topic"></a>

다음 코드 예시는 `ListSAMLProviders`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
)

// AccountWrapper encapsulates AWS Identity and Access Management (IAM) account actions
// used in the examples.
// It contains an IAM service client that is used to perform account actions.
type AccountWrapper struct {
	IamClient *iam.Client
}



// ListSAMLProviders gets the SAML providers for the account.
func (wrapper AccountWrapper) ListSAMLProviders(ctx context.Context) ([]types.SAMLProviderListEntry, error) {
	var providers []types.SAMLProviderListEntry
	result, err := wrapper.IamClient.ListSAMLProviders(ctx, &iam.ListSAMLProvidersInput{})
	if err != nil {
		log.Printf("Couldn't list SAML providers. Here's why: %v\n", err)
	} else {
		providers = result.SAMLProviderList
	}
	return providers, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListSAMLProviders](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListSAMLProviders)를 참조하세요.

### `ListUserPolicies`
<a name="iam_ListUserPolicies_go_2_topic"></a>

다음 코드 예시는 `ListUserPolicies`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// ListUserPolicies lists the inline policies for the specified user.
func (wrapper UserWrapper) ListUserPolicies(ctx context.Context, userName string) ([]string, error) {
	var policies []string
	result, err := wrapper.IamClient.ListUserPolicies(ctx, &iam.ListUserPoliciesInput{
		UserName: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't list policies for user %v. Here's why: %v\n", userName, err)
	} else {
		policies = result.PolicyNames
	}
	return policies, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListUserPolicies](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListUserPolicies)을 참조하세요.

### `ListUsers`
<a name="iam_ListUsers_go_2_topic"></a>

다음 코드 예시는 `ListUsers`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// ListUsers gets up to maxUsers number of users.
func (wrapper UserWrapper) ListUsers(ctx context.Context, maxUsers int32) ([]types.User, error) {
	var users []types.User
	result, err := wrapper.IamClient.ListUsers(ctx, &iam.ListUsersInput{
		MaxItems: aws.Int32(maxUsers),
	})
	if err != nil {
		log.Printf("Couldn't list users. Here's why: %v\n", err)
	} else {
		users = result.Users
	}
	return users, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListUsers](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.ListUsers)를 참조하세요.

### `PutUserPolicy`
<a name="iam_PutUserPolicy_go_2_topic"></a>

다음 코드 예시는 `PutUserPolicy`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/iam#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/smithy-go"
)

// UserWrapper encapsulates user actions used in the examples.
// It contains an IAM service client that is used to perform user actions.
type UserWrapper struct {
	IamClient *iam.Client
}



// CreateUserPolicy adds an inline policy to a user. This example creates a policy that
// grants a list of actions on a specified role.
// PolicyDocument shows how to work with a policy document as a data structure and
// serialize it to JSON by using Go's JSON marshaler.
func (wrapper UserWrapper) CreateUserPolicy(ctx context.Context, userName string, policyName string, actions []string,
	roleArn string) error {
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:   "Allow",
			Action:   actions,
			Resource: aws.String(roleArn),
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document for %v. Here's why: %v\n", roleArn, err)
		return err
	}
	_, err = wrapper.IamClient.PutUserPolicy(ctx, &iam.PutUserPolicyInput{
		PolicyDocument: aws.String(string(policyBytes)),
		PolicyName:     aws.String(policyName),
		UserName:       aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't create policy for user %v. Here's why: %v\n", userName, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [PutUserPolicy](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/iam#Client.PutUserPolicy)를 참조하세요.

# SDK for Go V2를 사용한 Kinesis 예시
<a name="go_2_kinesis_code_examples"></a>

다음 코드 예제에서는 Kinesis와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [서버리스 예제](#serverless_examples)

## 서버리스 예제
<a name="serverless_examples"></a>

### Kinesis 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_Kinesis_Lambda_go_2_topic"></a>

다음 코드 예제에서는 Kinesis 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 Kinesis 페이로드를 검색하고, Base64에서 디코딩하고, 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Kinesis 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"log"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, kinesisEvent events.KinesisEvent) error {
	if len(kinesisEvent.Records) == 0 {
		log.Printf("empty Kinesis event received")
		return nil
	}

	for _, record := range kinesisEvent.Records {
		log.Printf("processed Kinesis event with EventId: %v", record.EventID)
		recordDataBytes := record.Kinesis.Data
		recordDataText := string(recordDataBytes)
		log.Printf("record data: %v", recordDataText)
		// TODO: Do interesting work based on the new data
	}
	log.Printf("successfully processed %v records", len(kinesisEvent.Records))
	return nil
}

func main() {
	lambda.Start(handler)
}
```

### Kinesis 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_Kinesis_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제는 Kinesis 스트림에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda-with-batch-item-handling) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Kinesis 배치 항목 실패를 보고합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, kinesisEvent events.KinesisEvent) (map[string]interface{}, error) {
	batchItemFailures := []map[string]interface{}{}

	for _, record := range kinesisEvent.Records {
		curRecordSequenceNumber := ""

		// Process your record
		if /* Your record processing condition here */ {
			curRecordSequenceNumber = record.Kinesis.SequenceNumber
		}

		// Add a condition to check if the record processing failed
		if curRecordSequenceNumber != "" {
			batchItemFailures = append(batchItemFailures, map[string]interface{}{"itemIdentifier": curRecordSequenceNumber})
		}
	}

	kinesisBatchResponse := map[string]interface{}{
		"batchItemFailures": batchItemFailures,
	}
	return kinesisBatchResponse, nil
}

func main() {
	lambda.Start(handler)
}
```

# SDK for Go V2를 사용한 Lambda 예제
<a name="go_2_lambda_code_examples"></a>

다음 코드 예제에서는 Lambda와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

*AWS 커뮤니티 기여*는 여러 팀이 생성하고 유지 관리하는 예입니다 AWS. 피드백을 제공하려면 연결된 리포지토리에 제공된 메커니즘을 사용합니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)
+ [시나리오](#scenarios)
+ [서버리스 예제](#serverless_examples)
+ [AWS 커뮤니티 기여](#aws_community_contributions)

## 시작하기
<a name="get_started"></a>

### Hello Lambda
<a name="lambda_Hello_go_2_topic"></a>

다음 코드 예제에서는 Lambda 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
)

// main uses the AWS SDK for Go (v2) to create an AWS Lambda client and list up to 10
// functions in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	lambdaClient := lambda.NewFromConfig(sdkConfig)

	maxItems := 10
	fmt.Printf("Let's list up to %v functions for your account.\n", maxItems)
	result, err := lambdaClient.ListFunctions(ctx, &lambda.ListFunctionsInput{
		MaxItems: aws.Int32(int32(maxItems)),
	})
	if err != nil {
		fmt.Printf("Couldn't list functions for your account. Here's why: %v\n", err)
		return
	}
	if len(result.Functions) == 0 {
		fmt.Println("You don't have any functions!")
	} else {
		for _, function := range result.Functions {
			fmt.Printf("\t%v\n", *function.FunctionName)
		}
	}
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.ListFunctions)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="lambda_Scenario_GettingStartedFunctions_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ IAM 역할과 Lambda 함수를 생성하고 핸들러 코드를 업로드합니다.
+ 단일 파라미터로 함수를 간접적으로 간접 호출하고 결과를 가져옵니다.
+ 함수 코드를 업데이트하고 환경 변수로 구성합니다.
+ 새 파라미터로 함수를 간접적으로 간접 호출하고 결과를 가져옵니다. 반환된 실행 로그를 표시합니다.
+ 계정의 함수를 나열합니다.

자세한 내용은 [콘솔로 Lambda 함수 생성](https://docs.aws.amazon.com/lambda/latest/dg/getting-started-create-function.html)을 참조하세요.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Lambda 함수를 시작하는 방법을 보여주는 대화형 시나리오를 생성합니다.  

```
import (
	"archive/zip"
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"os"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/iam"
	iamtypes "github.com/aws/aws-sdk-go-v2/service/iam/types"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/lambda/actions"
)

// GetStartedFunctionsScenario shows you how to use AWS Lambda to perform the following
// actions:
//
//  1. Create an AWS Identity and Access Management (IAM) role and Lambda function, then upload handler code.
//  2. Invoke the function with a single parameter and get results.
//  3. Update the function code and configure with an environment variable.
//  4. Invoke the function with new parameters and get results. Display the returned execution log.
//  5. List the functions for your account, then clean up resources.
type GetStartedFunctionsScenario struct {
	sdkConfig       aws.Config
	functionWrapper actions.FunctionWrapper
	questioner      demotools.IQuestioner
	helper          IScenarioHelper
	isTestRun       bool
}

// NewGetStartedFunctionsScenario constructs a GetStartedFunctionsScenario instance from a configuration.
// It uses the specified config to get a Lambda client and create wrappers for the actions
// used in the scenario.
func NewGetStartedFunctionsScenario(sdkConfig aws.Config, questioner demotools.IQuestioner,
	helper IScenarioHelper) GetStartedFunctionsScenario {
	lambdaClient := lambda.NewFromConfig(sdkConfig)
	return GetStartedFunctionsScenario{
		sdkConfig:       sdkConfig,
		functionWrapper: actions.FunctionWrapper{LambdaClient: lambdaClient},
		questioner:      questioner,
		helper:          helper,
	}
}

// Run runs the interactive scenario.
func (scenario GetStartedFunctionsScenario) Run(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong with the demo.\n")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the AWS Lambda get started with functions demo.")
	log.Println(strings.Repeat("-", 88))

	role := scenario.GetOrCreateRole(ctx)
	funcName := scenario.CreateFunction(ctx, role)
	scenario.InvokeIncrement(ctx, funcName)
	scenario.UpdateFunction(ctx, funcName)
	scenario.InvokeCalculator(ctx, funcName)
	scenario.ListFunctions(ctx)
	scenario.Cleanup(ctx, role, funcName)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}

// GetOrCreateRole checks whether the specified role exists and returns it if it does.
// Otherwise, a role is created that specifies Lambda as a trusted principal.
// The AWSLambdaBasicExecutionRole managed policy is attached to the role and the role
// is returned.
func (scenario GetStartedFunctionsScenario) GetOrCreateRole(ctx context.Context) *iamtypes.Role {
	var role *iamtypes.Role
	iamClient := iam.NewFromConfig(scenario.sdkConfig)
	log.Println("First, we need an IAM role that Lambda can assume.")
	roleName := scenario.questioner.Ask("Enter a name for the role:", demotools.NotEmpty{})
	getOutput, err := iamClient.GetRole(ctx, &iam.GetRoleInput{
		RoleName: aws.String(roleName)})
	if err != nil {
		var noSuch *iamtypes.NoSuchEntityException
		if errors.As(err, &noSuch) {
			log.Printf("Role %v doesn't exist. Creating it....\n", roleName)
		} else {
			log.Panicf("Couldn't check whether role %v exists. Here's why: %v\n",
				roleName, err)
		}
	} else {
		role = getOutput.Role
		log.Printf("Found role %v.\n", *role.RoleName)
	}
	if role == nil {
		trustPolicy := PolicyDocument{
			Version: "2012-10-17",
			Statement: []PolicyStatement{{
				Effect:    "Allow",
				Principal: map[string]string{"Service": "lambda.amazonaws.com"},
				Action:    []string{"sts:AssumeRole"},
			}},
		}
		policyArn := "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
		createOutput, err := iamClient.CreateRole(ctx, &iam.CreateRoleInput{
			AssumeRolePolicyDocument: aws.String(trustPolicy.String()),
			RoleName:                 aws.String(roleName),
		})
		if err != nil {
			log.Panicf("Couldn't create role %v. Here's why: %v\n", roleName, err)
		}
		role = createOutput.Role
		_, err = iamClient.AttachRolePolicy(ctx, &iam.AttachRolePolicyInput{
			PolicyArn: aws.String(policyArn),
			RoleName:  aws.String(roleName),
		})
		if err != nil {
			log.Panicf("Couldn't attach a policy to role %v. Here's why: %v\n", roleName, err)
		}
		log.Printf("Created role %v.\n", *role.RoleName)
		log.Println("Let's give AWS a few seconds to propagate resources...")
		scenario.helper.Pause(10)
	}
	log.Println(strings.Repeat("-", 88))
	return role
}

// CreateFunction creates a Lambda function and uploads a handler written in Python.
// The code for the Python handler is packaged as a []byte in .zip format.
func (scenario GetStartedFunctionsScenario) CreateFunction(ctx context.Context, role *iamtypes.Role) string {
	log.Println("Let's create a function that increments a number.\n" +
		"The function uses the 'lambda_handler_basic.py' script found in the \n" +
		"'handlers' directory of this project.")
	funcName := scenario.questioner.Ask("Enter a name for the Lambda function:", demotools.NotEmpty{})
	zipPackage := scenario.helper.CreateDeploymentPackage("lambda_handler_basic.py", fmt.Sprintf("%v.py", funcName))
	log.Printf("Creating function %v and waiting for it to be ready.", funcName)
	funcState := scenario.functionWrapper.CreateFunction(ctx, funcName, fmt.Sprintf("%v.lambda_handler", funcName),
		role.Arn, zipPackage)
	log.Printf("Your function is %v.", funcState)
	log.Println(strings.Repeat("-", 88))
	return funcName
}

// InvokeIncrement invokes a Lambda function that increments a number. The function
// parameters are contained in a Go struct that is used to serialize the parameters to
// a JSON payload that is passed to the function.
// The result payload is deserialized into a Go struct that contains an int value.
func (scenario GetStartedFunctionsScenario) InvokeIncrement(ctx context.Context, funcName string) {
	parameters := actions.IncrementParameters{Action: "increment"}
	log.Println("Let's invoke our function. This function increments a number.")
	parameters.Number = scenario.questioner.AskInt("Enter a number to increment:", demotools.NotEmpty{})
	log.Printf("Invoking %v with %v...\n", funcName, parameters.Number)
	invokeOutput := scenario.functionWrapper.Invoke(ctx, funcName, parameters, false)
	var payload actions.LambdaResultInt
	err := json.Unmarshal(invokeOutput.Payload, &payload)
	if err != nil {
		log.Panicf("Couldn't unmarshal payload from invoking %v. Here's why: %v\n",
			funcName, err)
	}
	log.Printf("Invoking %v with %v returned %v.\n", funcName, parameters.Number, payload)
	log.Println(strings.Repeat("-", 88))
}

// UpdateFunction updates the code for a Lambda function by uploading a simple arithmetic
// calculator written in Python. The code for the Python handler is packaged as a
// []byte in .zip format.
// After the code is updated, the configuration is also updated with a new log
// level that instructs the handler to log additional information.
func (scenario GetStartedFunctionsScenario) UpdateFunction(ctx context.Context, funcName string) {
	log.Println("Let's update the function to an arithmetic calculator.\n" +
		"The function uses the 'lambda_handler_calculator.py' script found in the \n" +
		"'handlers' directory of this project.")
	scenario.questioner.Ask("Press Enter when you're ready.")
	log.Println("Creating deployment package...")
	zipPackage := scenario.helper.CreateDeploymentPackage("lambda_handler_calculator.py",
		fmt.Sprintf("%v.py", funcName))
	log.Println("...and updating the Lambda function and waiting for it to be ready.")
	funcState := scenario.functionWrapper.UpdateFunctionCode(ctx, funcName, zipPackage)
	log.Printf("Updated function %v. Its current state is %v.", funcName, funcState)
	log.Println("This function uses an environment variable to control logging level.")
	log.Println("Let's set it to DEBUG to get the most logging.")
	scenario.functionWrapper.UpdateFunctionConfiguration(ctx, funcName,
		map[string]string{"LOG_LEVEL": "DEBUG"})
	log.Println(strings.Repeat("-", 88))
}

// InvokeCalculator invokes the Lambda calculator function. The parameters are stored in a
// Go struct that is used to serialize the parameters to a JSON payload. That payload is then passed
// to the function.
// The result payload is deserialized to a Go struct that stores the result as either an
// int or float32, depending on the kind of operation that was specified.
func (scenario GetStartedFunctionsScenario) InvokeCalculator(ctx context.Context, funcName string) {
	wantInvoke := true
	choices := []string{"plus", "minus", "times", "divided-by"}
	for wantInvoke {
		choice := scenario.questioner.AskChoice("Select an arithmetic operation:\n", choices)
		x := scenario.questioner.AskInt("Enter a value for x:", demotools.NotEmpty{})
		y := scenario.questioner.AskInt("Enter a value for y:", demotools.NotEmpty{})
		log.Printf("Invoking %v %v %v...", x, choices[choice], y)
		calcParameters := actions.CalculatorParameters{
			Action: choices[choice],
			X:      x,
			Y:      y,
		}
		invokeOutput := scenario.functionWrapper.Invoke(ctx, funcName, calcParameters, true)
		var payload any
		if choice == 3 { // divide-by results in a float.
			payload = actions.LambdaResultFloat{}
		} else {
			payload = actions.LambdaResultInt{}
		}
		err := json.Unmarshal(invokeOutput.Payload, &payload)
		if err != nil {
			log.Panicf("Couldn't unmarshal payload from invoking %v. Here's why: %v\n",
				funcName, err)
		}
		log.Printf("Invoking %v with %v %v %v returned %v.\n", funcName,
			calcParameters.X, calcParameters.Action, calcParameters.Y, payload)
		scenario.questioner.Ask("Press Enter to see the logs from the call.")
		logRes, err := base64.StdEncoding.DecodeString(*invokeOutput.LogResult)
		if err != nil {
			log.Panicf("Couldn't decode log result. Here's why: %v\n", err)
		}
		log.Println(string(logRes))
		wantInvoke = scenario.questioner.AskBool("Do you want to calculate again? (y/n)", "y")
	}
	log.Println(strings.Repeat("-", 88))
}

// ListFunctions lists up to the specified number of functions for your account.
func (scenario GetStartedFunctionsScenario) ListFunctions(ctx context.Context) {
	count := scenario.questioner.AskInt(
		"Let's list functions for your account. How many do you want to see?", demotools.NotEmpty{})
	functions := scenario.functionWrapper.ListFunctions(ctx, count)
	log.Printf("Found %v functions:", len(functions))
	for _, function := range functions {
		log.Printf("\t%v", *function.FunctionName)
	}
	log.Println(strings.Repeat("-", 88))
}

// Cleanup removes the IAM and Lambda resources created by the example.
func (scenario GetStartedFunctionsScenario) Cleanup(ctx context.Context, role *iamtypes.Role, funcName string) {
	if scenario.questioner.AskBool("Do you want to clean up resources created for this example? (y/n)",
		"y") {
		iamClient := iam.NewFromConfig(scenario.sdkConfig)
		policiesOutput, err := iamClient.ListAttachedRolePolicies(ctx,
			&iam.ListAttachedRolePoliciesInput{RoleName: role.RoleName})
		if err != nil {
			log.Panicf("Couldn't get policies attached to role %v. Here's why: %v\n",
				*role.RoleName, err)
		}
		for _, policy := range policiesOutput.AttachedPolicies {
			_, err = iamClient.DetachRolePolicy(ctx, &iam.DetachRolePolicyInput{
				PolicyArn: policy.PolicyArn, RoleName: role.RoleName,
			})
			if err != nil {
				log.Panicf("Couldn't detach policy %v from role %v. Here's why: %v\n",
					*policy.PolicyArn, *role.RoleName, err)
			}
		}
		_, err = iamClient.DeleteRole(ctx, &iam.DeleteRoleInput{RoleName: role.RoleName})
		if err != nil {
			log.Panicf("Couldn't delete role %v. Here's why: %v\n", *role.RoleName, err)
		}
		log.Printf("Deleted role %v.\n", *role.RoleName)

		scenario.functionWrapper.DeleteFunction(ctx, funcName)
		log.Printf("Deleted function %v.\n", funcName)
	} else {
		log.Println("Okay. Don't forget to delete the resources when you're done with them.")
	}
}

// IScenarioHelper abstracts I/O and wait functions from a scenario so that they
// can be mocked for unit testing.
type IScenarioHelper interface {
	Pause(secs int)
	CreateDeploymentPackage(sourceFile string, destinationFile string) *bytes.Buffer
}

// ScenarioHelper lets the caller specify the path to Lambda handler functions.
type ScenarioHelper struct {
	HandlerPath string
}

// Pause waits for the specified number of seconds.
func (helper *ScenarioHelper) Pause(secs int) {
	time.Sleep(time.Duration(secs) * time.Second)
}

// CreateDeploymentPackage creates an AWS Lambda deployment package from a source file. The
// deployment package is stored in .zip format in a bytes.Buffer. The buffer can be
// used to pass a []byte to Lambda when creating the function.
// The specified destinationFile is the name to give the file when it's deployed to Lambda.
func (helper *ScenarioHelper) CreateDeploymentPackage(sourceFile string, destinationFile string) *bytes.Buffer {
	var err error
	buffer := &bytes.Buffer{}
	writer := zip.NewWriter(buffer)
	zFile, err := writer.Create(destinationFile)
	if err != nil {
		log.Panicf("Couldn't create destination archive %v. Here's why: %v\n", destinationFile, err)
	}
	sourceBody, err := os.ReadFile(fmt.Sprintf("%v/%v", helper.HandlerPath, sourceFile))
	if err != nil {
		log.Panicf("Couldn't read handler source file %v. Here's why: %v\n",
			sourceFile, err)
	} else {
		_, err = zFile.Write(sourceBody)
		if err != nil {
			log.Panicf("Couldn't write handler %v to zip archive. Here's why: %v\n",
				sourceFile, err)
		}
	}
	err = writer.Close()
	if err != nil {
		log.Panicf("Couldn't close zip writer. Here's why: %v\n", err)
	}
	return buffer
}
```
개별 Lambda 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}


// GetFunction gets data about the Lambda function specified by functionName.
func (wrapper FunctionWrapper) GetFunction(ctx context.Context, functionName string) types.State {
	var state types.State
	funcOutput, err := wrapper.LambdaClient.GetFunction(ctx, &lambda.GetFunctionInput{
		FunctionName: aws.String(functionName),
	})
	if err != nil {
		log.Panicf("Couldn't get function %v. Here's why: %v\n", functionName, err)
	} else {
		state = funcOutput.Configuration.State
	}
	return state
}



// CreateFunction creates a new Lambda function from code contained in the zipPackage
// buffer. The specified handlerName must match the name of the file and function
// contained in the uploaded code. The role specified by iamRoleArn is assumed by
// Lambda and grants specific permissions.
// When the function already exists, types.StateActive is returned.
// When the function is created, a lambda.FunctionActiveV2Waiter is used to wait until the
// function is active.
func (wrapper FunctionWrapper) CreateFunction(ctx context.Context, functionName string, handlerName string,
	iamRoleArn *string, zipPackage *bytes.Buffer) types.State {
	var state types.State
	_, err := wrapper.LambdaClient.CreateFunction(ctx, &lambda.CreateFunctionInput{
		Code:         &types.FunctionCode{ZipFile: zipPackage.Bytes()},
		FunctionName: aws.String(functionName),
		Role:         iamRoleArn,
		Handler:      aws.String(handlerName),
		Publish:      true,
		Runtime:      types.RuntimePython39,
	})
	if err != nil {
		var resConflict *types.ResourceConflictException
		if errors.As(err, &resConflict) {
			log.Printf("Function %v already exists.\n", functionName)
			state = types.StateActive
		} else {
			log.Panicf("Couldn't create function %v. Here's why: %v\n", functionName, err)
		}
	} else {
		waiter := lambda.NewFunctionActiveV2Waiter(wrapper.LambdaClient)
		funcOutput, err := waiter.WaitForOutput(ctx, &lambda.GetFunctionInput{
			FunctionName: aws.String(functionName)}, 1*time.Minute)
		if err != nil {
			log.Panicf("Couldn't wait for function %v to be active. Here's why: %v\n", functionName, err)
		} else {
			state = funcOutput.Configuration.State
		}
	}
	return state
}



// UpdateFunctionCode updates the code for the Lambda function specified by functionName.
// The existing code for the Lambda function is entirely replaced by the code in the
// zipPackage buffer. After the update action is called, a lambda.FunctionUpdatedV2Waiter
// is used to wait until the update is successful.
func (wrapper FunctionWrapper) UpdateFunctionCode(ctx context.Context, functionName string, zipPackage *bytes.Buffer) types.State {
	var state types.State
	_, err := wrapper.LambdaClient.UpdateFunctionCode(ctx, &lambda.UpdateFunctionCodeInput{
		FunctionName: aws.String(functionName), ZipFile: zipPackage.Bytes(),
	})
	if err != nil {
		log.Panicf("Couldn't update code for function %v. Here's why: %v\n", functionName, err)
	} else {
		waiter := lambda.NewFunctionUpdatedV2Waiter(wrapper.LambdaClient)
		funcOutput, err := waiter.WaitForOutput(ctx, &lambda.GetFunctionInput{
			FunctionName: aws.String(functionName)}, 1*time.Minute)
		if err != nil {
			log.Panicf("Couldn't wait for function %v to be active. Here's why: %v\n", functionName, err)
		} else {
			state = funcOutput.Configuration.State
		}
	}
	return state
}



// UpdateFunctionConfiguration updates a map of environment variables configured for
// the Lambda function specified by functionName.
func (wrapper FunctionWrapper) UpdateFunctionConfiguration(ctx context.Context, functionName string, envVars map[string]string) {
	_, err := wrapper.LambdaClient.UpdateFunctionConfiguration(ctx, &lambda.UpdateFunctionConfigurationInput{
		FunctionName: aws.String(functionName),
		Environment:  &types.Environment{Variables: envVars},
	})
	if err != nil {
		log.Panicf("Couldn't update configuration for %v. Here's why: %v", functionName, err)
	}
}



// ListFunctions lists up to maxItems functions for the account. This function uses a
// lambda.ListFunctionsPaginator to paginate the results.
func (wrapper FunctionWrapper) ListFunctions(ctx context.Context, maxItems int) []types.FunctionConfiguration {
	var functions []types.FunctionConfiguration
	paginator := lambda.NewListFunctionsPaginator(wrapper.LambdaClient, &lambda.ListFunctionsInput{
		MaxItems: aws.Int32(int32(maxItems)),
	})
	for paginator.HasMorePages() && len(functions) < maxItems {
		pageOutput, err := paginator.NextPage(ctx)
		if err != nil {
			log.Panicf("Couldn't list functions for your account. Here's why: %v\n", err)
		}
		functions = append(functions, pageOutput.Functions...)
	}
	return functions
}



// DeleteFunction deletes the Lambda function specified by functionName.
func (wrapper FunctionWrapper) DeleteFunction(ctx context.Context, functionName string) {
	_, err := wrapper.LambdaClient.DeleteFunction(ctx, &lambda.DeleteFunctionInput{
		FunctionName: aws.String(functionName),
	})
	if err != nil {
		log.Panicf("Couldn't delete function %v. Here's why: %v\n", functionName, err)
	}
}



// Invoke invokes the Lambda function specified by functionName, passing the parameters
// as a JSON payload. When getLog is true, types.LogTypeTail is specified, which tells
// Lambda to include the last few log lines in the returned result.
func (wrapper FunctionWrapper) Invoke(ctx context.Context, functionName string, parameters any, getLog bool) *lambda.InvokeOutput {
	logType := types.LogTypeNone
	if getLog {
		logType = types.LogTypeTail
	}
	payload, err := json.Marshal(parameters)
	if err != nil {
		log.Panicf("Couldn't marshal parameters to JSON. Here's why %v\n", err)
	}
	invokeOutput, err := wrapper.LambdaClient.Invoke(ctx, &lambda.InvokeInput{
		FunctionName: aws.String(functionName),
		LogType:      logType,
		Payload:      payload,
	})
	if err != nil {
		log.Panicf("Couldn't invoke function %v. Here's why: %v\n", functionName, err)
	}
	return invokeOutput
}



// IncrementParameters is used to serialize parameters to the increment Lambda handler.
type IncrementParameters struct {
	Action string `json:"action"`
	Number int    `json:"number"`
}

// CalculatorParameters is used to serialize parameters to the calculator Lambda handler.
type CalculatorParameters struct {
	Action string `json:"action"`
	X      int    `json:"x"`
	Y      int    `json:"y"`
}

// LambdaResultInt is used to deserialize an int result from a Lambda handler.
type LambdaResultInt struct {
	Result int `json:"result"`
}

// LambdaResultFloat is used to deserialize a float32 result from a Lambda handler.
type LambdaResultFloat struct {
	Result float32 `json:"result"`
}
```
숫자를 증가시키는 Lambda 핸들러를 정의합니다.  

```
import logging

logger = logging.getLogger()
logger.setLevel(logging.INFO)


def lambda_handler(event, context):
    """
    Accepts an action and a single number, performs the specified action on the number,
    and returns the result. The only allowable action is 'increment'.

    :param event: The event dict that contains the parameters sent when the function
                  is invoked.
    :param context: The context in which the function is called.
    :return: The result of the action.
    """
    result = None
    action = event.get("action")
    if action == "increment":
        result = event.get("number", 0) + 1
        logger.info("Calculated result of %s", result)
    else:
        logger.error("%s is not a valid action.", action)

    response = {"result": result}
    return response
```
산술 연산을 수행하는 두 번째 Lambda 핸들러를 정의합니다.  

```
import logging
import os


logger = logging.getLogger()

# Define a list of Python lambda functions that are called by this AWS Lambda function.
ACTIONS = {
    "plus": lambda x, y: x + y,
    "minus": lambda x, y: x - y,
    "times": lambda x, y: x * y,
    "divided-by": lambda x, y: x / y,
}


def lambda_handler(event, context):
    """
    Accepts an action and two numbers, performs the specified action on the numbers,
    and returns the result.

    :param event: The event dict that contains the parameters sent when the function
                  is invoked.
    :param context: The context in which the function is called.
    :return: The result of the specified action.
    """
    # Set the log level based on a variable configured in the Lambda environment.
    logger.setLevel(os.environ.get("LOG_LEVEL", logging.INFO))
    logger.debug("Event: %s", event)

    action = event.get("action")
    func = ACTIONS.get(action)
    x = event.get("x")
    y = event.get("y")
    result = None
    try:
        if func is not None and x is not None and y is not None:
            result = func(x, y)
            logger.info("%s %s %s is %s", x, action, y, result)
        else:
            logger.error("I can't calculate %s %s %s.", x, action, y)
    except ZeroDivisionError:
        logger.warning("I can't divide %s by 0!", x)

    response = {"result": result}
    return response
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 항목을 참조하세요.
  + [CreateFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.CreateFunction)
  + [DeleteFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.DeleteFunction)
  + [GetFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.GetFunction)
  + [간접 호출](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.Invoke)
  + [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.ListFunctions)
  + [UpdateFunctionCode](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionCode)
  + [UpdateFunctionConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionConfiguration)

## 작업
<a name="actions"></a>

### `CreateFunction`
<a name="lambda_CreateFunction_go_2_topic"></a>

다음 코드 예시는 `CreateFunction`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// CreateFunction creates a new Lambda function from code contained in the zipPackage
// buffer. The specified handlerName must match the name of the file and function
// contained in the uploaded code. The role specified by iamRoleArn is assumed by
// Lambda and grants specific permissions.
// When the function already exists, types.StateActive is returned.
// When the function is created, a lambda.FunctionActiveV2Waiter is used to wait until the
// function is active.
func (wrapper FunctionWrapper) CreateFunction(ctx context.Context, functionName string, handlerName string,
	iamRoleArn *string, zipPackage *bytes.Buffer) types.State {
	var state types.State
	_, err := wrapper.LambdaClient.CreateFunction(ctx, &lambda.CreateFunctionInput{
		Code:         &types.FunctionCode{ZipFile: zipPackage.Bytes()},
		FunctionName: aws.String(functionName),
		Role:         iamRoleArn,
		Handler:      aws.String(handlerName),
		Publish:      true,
		Runtime:      types.RuntimePython39,
	})
	if err != nil {
		var resConflict *types.ResourceConflictException
		if errors.As(err, &resConflict) {
			log.Printf("Function %v already exists.\n", functionName)
			state = types.StateActive
		} else {
			log.Panicf("Couldn't create function %v. Here's why: %v\n", functionName, err)
		}
	} else {
		waiter := lambda.NewFunctionActiveV2Waiter(wrapper.LambdaClient)
		funcOutput, err := waiter.WaitForOutput(ctx, &lambda.GetFunctionInput{
			FunctionName: aws.String(functionName)}, 1*time.Minute)
		if err != nil {
			log.Panicf("Couldn't wait for function %v to be active. Here's why: %v\n", functionName, err)
		} else {
			state = funcOutput.Configuration.State
		}
	}
	return state
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [CreateFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.CreateFunction)을 참조하세요.

### `DeleteFunction`
<a name="lambda_DeleteFunction_go_2_topic"></a>

다음 코드 예시는 `DeleteFunction`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// DeleteFunction deletes the Lambda function specified by functionName.
func (wrapper FunctionWrapper) DeleteFunction(ctx context.Context, functionName string) {
	_, err := wrapper.LambdaClient.DeleteFunction(ctx, &lambda.DeleteFunctionInput{
		FunctionName: aws.String(functionName),
	})
	if err != nil {
		log.Panicf("Couldn't delete function %v. Here's why: %v\n", functionName, err)
	}
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [DeleteFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.DeleteFunction)을 참조하세요.

### `GetFunction`
<a name="lambda_GetFunction_go_2_topic"></a>

다음 코드 예시는 `GetFunction`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// GetFunction gets data about the Lambda function specified by functionName.
func (wrapper FunctionWrapper) GetFunction(ctx context.Context, functionName string) types.State {
	var state types.State
	funcOutput, err := wrapper.LambdaClient.GetFunction(ctx, &lambda.GetFunctionInput{
		FunctionName: aws.String(functionName),
	})
	if err != nil {
		log.Panicf("Couldn't get function %v. Here's why: %v\n", functionName, err)
	} else {
		state = funcOutput.Configuration.State
	}
	return state
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [GetFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.GetFunction)을 참조하세요.

### `Invoke`
<a name="lambda_Invoke_go_2_topic"></a>

다음 코드 예시는 `Invoke`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// Invoke invokes the Lambda function specified by functionName, passing the parameters
// as a JSON payload. When getLog is true, types.LogTypeTail is specified, which tells
// Lambda to include the last few log lines in the returned result.
func (wrapper FunctionWrapper) Invoke(ctx context.Context, functionName string, parameters any, getLog bool) *lambda.InvokeOutput {
	logType := types.LogTypeNone
	if getLog {
		logType = types.LogTypeTail
	}
	payload, err := json.Marshal(parameters)
	if err != nil {
		log.Panicf("Couldn't marshal parameters to JSON. Here's why %v\n", err)
	}
	invokeOutput, err := wrapper.LambdaClient.Invoke(ctx, &lambda.InvokeInput{
		FunctionName: aws.String(functionName),
		LogType:      logType,
		Payload:      payload,
	})
	if err != nil {
		log.Panicf("Couldn't invoke function %v. Here's why: %v\n", functionName, err)
	}
	return invokeOutput
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [간접 호출](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.Invoke)을 참조하세요.

### `ListFunctions`
<a name="lambda_ListFunctions_go_2_topic"></a>

다음 코드 예시는 `ListFunctions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// ListFunctions lists up to maxItems functions for the account. This function uses a
// lambda.ListFunctionsPaginator to paginate the results.
func (wrapper FunctionWrapper) ListFunctions(ctx context.Context, maxItems int) []types.FunctionConfiguration {
	var functions []types.FunctionConfiguration
	paginator := lambda.NewListFunctionsPaginator(wrapper.LambdaClient, &lambda.ListFunctionsInput{
		MaxItems: aws.Int32(int32(maxItems)),
	})
	for paginator.HasMorePages() && len(functions) < maxItems {
		pageOutput, err := paginator.NextPage(ctx)
		if err != nil {
			log.Panicf("Couldn't list functions for your account. Here's why: %v\n", err)
		}
		functions = append(functions, pageOutput.Functions...)
	}
	return functions
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.ListFunctions)를 참조하세요.

### `UpdateFunctionCode`
<a name="lambda_UpdateFunctionCode_go_2_topic"></a>

다음 코드 예시는 `UpdateFunctionCode`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// UpdateFunctionCode updates the code for the Lambda function specified by functionName.
// The existing code for the Lambda function is entirely replaced by the code in the
// zipPackage buffer. After the update action is called, a lambda.FunctionUpdatedV2Waiter
// is used to wait until the update is successful.
func (wrapper FunctionWrapper) UpdateFunctionCode(ctx context.Context, functionName string, zipPackage *bytes.Buffer) types.State {
	var state types.State
	_, err := wrapper.LambdaClient.UpdateFunctionCode(ctx, &lambda.UpdateFunctionCodeInput{
		FunctionName: aws.String(functionName), ZipFile: zipPackage.Bytes(),
	})
	if err != nil {
		log.Panicf("Couldn't update code for function %v. Here's why: %v\n", functionName, err)
	} else {
		waiter := lambda.NewFunctionUpdatedV2Waiter(wrapper.LambdaClient)
		funcOutput, err := waiter.WaitForOutput(ctx, &lambda.GetFunctionInput{
			FunctionName: aws.String(functionName)}, 1*time.Minute)
		if err != nil {
			log.Panicf("Couldn't wait for function %v to be active. Here's why: %v\n", functionName, err)
		} else {
			state = funcOutput.Configuration.State
		}
	}
	return state
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [UpdateFunctionCode](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionCode)를 참조하세요.

### `UpdateFunctionConfiguration`
<a name="lambda_UpdateFunctionConfiguration_go_2_topic"></a>

다음 코드 예시는 `UpdateFunctionConfiguration`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/lambda"
	"github.com/aws/aws-sdk-go-v2/service/lambda/types"
)

// FunctionWrapper encapsulates function actions used in the examples.
// It contains an AWS Lambda service client that is used to perform user actions.
type FunctionWrapper struct {
	LambdaClient *lambda.Client
}



// UpdateFunctionConfiguration updates a map of environment variables configured for
// the Lambda function specified by functionName.
func (wrapper FunctionWrapper) UpdateFunctionConfiguration(ctx context.Context, functionName string, envVars map[string]string) {
	_, err := wrapper.LambdaClient.UpdateFunctionConfiguration(ctx, &lambda.UpdateFunctionConfigurationInput{
		FunctionName: aws.String(functionName),
		Environment:  &types.Environment{Variables: envVars},
	})
	if err != nil {
		log.Panicf("Couldn't update configuration for %v. Here's why: %v", functionName, err)
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [UpdateFunctionConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionConfiguration)을 참조하세요.

## 시나리오
<a name="scenarios"></a>

### Lambda 함수를 사용하여 알려진 사용자를 자동으로 확인
<a name="cross_CognitoAutoConfirmUser_go_2_topic"></a>

다음 코드 예제는 Lambda 함수를 사용하여 알려진 Amazon Cognito 사용자를 자동으로 확인하는 방법을 보여줍니다.
+ `PreSignUp` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ Amazon Cognito를 사용하여 사용자 가입시키기
+ Lambda 함수는 DynamoDB 테이블을 스캔하고 알려진 사용자를 자동으로 확인합니다.
+ 새 사용자로 로그인한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// AutoConfirm separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type AutoConfirm struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewAutoConfirm constructs a new auto confirm runner.
func NewAutoConfirm(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) AutoConfirm {
	scenario := AutoConfirm{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddPreSignUpTrigger adds a Lambda handler as an invocation target for the PreSignUp trigger.
func (runner *AutoConfirm) AddPreSignUpTrigger(ctx context.Context, userPoolId string, functionArn string) {
	log.Printf("Let's add a Lambda function to handle the PreSignUp trigger from Cognito.\n" +
		"This trigger happens when a user signs up, and lets your function take action before the main Cognito\n" +
		"sign up processing occurs.\n")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.PreSignUp, HandlerArn: aws.String(functionArn)})
	if err != nil {
		panic(err)
	}
	log.Printf("Lambda function %v added to user pool %v to handle the PreSignUp trigger.\n",
		functionArn, userPoolId)
}

// SignUpUser signs up a user from the known user table with a password you specify.
func (runner *AutoConfirm) SignUpUser(ctx context.Context, clientId string, usersTable string) (string, string) {
	log.Println("Let's sign up a user to your Cognito user pool. When the user's email matches an email in the\n" +
		"DynamoDB known users table, it is automatically verified and the user is confirmed.")

	knownUsers, err := runner.helper.GetKnownUsers(ctx, usersTable)
	if err != nil {
		panic(err)
	}
	userChoice := runner.questioner.AskChoice("Which user do you want to use?\n", knownUsers.UserNameList())
	user := knownUsers.Users[userChoice]

	var signedUp bool
	var userConfirmed bool
	password := runner.questioner.AskPassword("Enter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !signedUp {
		log.Printf("Signing up user '%v' with email '%v' to Cognito.\n", user.UserName, user.UserEmail)
		userConfirmed, err = runner.cognitoActor.SignUp(ctx, clientId, user.UserName, password, user.UserEmail)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("Enter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			signedUp = true
		}
	}
	log.Printf("User %v signed up, confirmed = %v.\n", user.UserName, userConfirmed)

	log.Println(strings.Repeat("-", 88))

	return user.UserName, password
}

// SignInUser signs in a user.
func (runner *AutoConfirm) SignInUser(ctx context.Context, clientId string, userName string, password string) string {
	runner.questioner.Ask("Press Enter when you're ready to continue.")
	log.Printf("Let's sign in as %v...\n", userName)
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, userName, password)
	if err != nil {
		panic(err)
	}
	log.Printf("Successfully signed in. Your access token starts with: %v...\n", (*authResult.AccessToken)[:10])
	log.Println(strings.Repeat("-", 88))
	return *authResult.AccessToken
}

// Run runs the scenario.
func (runner *AutoConfirm) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]
	runner.helper.PopulateUserTable(ctx, stackOutputs["TableName"])

	runner.AddPreSignUpTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["AutoConfirmFunctionArn"])
	runner.resources.triggers = append(runner.resources.triggers, actions.PreSignUp)
	userName, password := runner.SignUpUser(ctx, stackOutputs["UserPoolClientId"], stackOutputs["TableName"])
	runner.helper.ListRecentLogEvents(ctx, stackOutputs["AutoConfirmFunction"])
	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens,
		runner.SignInUser(ctx, stackOutputs["UserPoolClientId"], userName, password))

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `PreSignUp` 트리거를 처리합니다.  

```
import (
	"context"
	"log"
	"os"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	dynamodbtypes "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

const TABLE_NAME = "TABLE_NAME"

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string `dynamodbav:"UserName"`
	UserEmail string `dynamodbav:"UserEmail"`
}

// GetKey marshals the user email value to a DynamoDB key format.
func (user UserInfo) GetKey() map[string]dynamodbtypes.AttributeValue {
	userEmail, err := attributevalue.Marshal(user.UserEmail)
	if err != nil {
		panic(err)
	}
	return map[string]dynamodbtypes.AttributeValue{"UserEmail": userEmail}
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the PreSignUp event by looking up a user in an Amazon DynamoDB table and
// specifying whether they should be confirmed and verified.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsPreSignup) (events.CognitoEventUserPoolsPreSignup, error) {
	log.Printf("Received presignup from %v for user '%v'", event.TriggerSource, event.UserName)
	if event.TriggerSource != "PreSignUp_SignUp" {
		// Other trigger sources, such as PreSignUp_AdminInitiateAuth, ignore the response from this handler.
		return event, nil
	}
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserEmail: event.Request.UserAttributes["email"],
	}
	log.Printf("Looking up email %v in table %v.\n", user.UserEmail, tableName)
	output, err := h.dynamoClient.GetItem(ctx, &dynamodb.GetItemInput{
		Key:       user.GetKey(),
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Error looking up email %v.\n", user.UserEmail)
		return event, err
	}
	if output.Item == nil {
		log.Printf("Email %v not found. Email verification is required.\n", user.UserEmail)
		return event, err
	}

	err = attributevalue.UnmarshalMap(output.Item, &user)
	if err != nil {
		log.Printf("Couldn't unmarshal DynamoDB item. Here's why: %v\n", err)
		return event, err
	}

	if user.UserName != event.UserName {
		log.Printf("UserEmail %v found, but stored UserName '%v' does not match supplied UserName '%v'. Verification is required.\n",
			user.UserEmail, user.UserName, event.UserName)
	} else {
		log.Printf("UserEmail %v found with matching UserName %v. User is confirmed.\n", user.UserEmail, user.UserName)
		event.Response.AutoConfirmUser = true
		event.Response.AutoVerifyEmail = true
	}

	return event, err
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [SignUp](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.SignUp)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

### Lambda 함수를 사용하여 알려진 사용자를 자동으로 마이그레이션
<a name="cross_CognitoAutoMigrateUser_go_2_topic"></a>

다음 코드 예제는 Lambda 함수를 사용하여 알려진 Amazon Cognito 사용자를 자동으로 마이그레이션하는 방법을 보여줍니다.
+ `MigrateUser` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ 사용자 풀에 없는 사용자 이름과 이메일을 사용하여 Amazon Cognito에 로그인합니다.
+ Lambda 함수는 DynamoDB 테이블을 스캔하고 알려진 사용자를 사용자 풀로 자동으로 마이그레이션합니다.
+ 암호 찾기 흐름을 수행하여 마이그레이션된 사용자의 암호를 재설정합니다.
+ 새 사용자로 로그인한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"fmt"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// MigrateUser separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type MigrateUser struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewMigrateUser constructs a new migrate user runner.
func NewMigrateUser(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) MigrateUser {
	scenario := MigrateUser{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddMigrateUserTrigger adds a Lambda handler as an invocation target for the MigrateUser trigger.
func (runner *MigrateUser) AddMigrateUserTrigger(ctx context.Context, userPoolId string, functionArn string) {
	log.Printf("Let's add a Lambda function to handle the MigrateUser trigger from Cognito.\n" +
		"This trigger happens when an unknown user signs in, and lets your function take action before Cognito\n" +
		"rejects the user.\n\n")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.UserMigration, HandlerArn: aws.String(functionArn)})
	if err != nil {
		panic(err)
	}
	log.Printf("Lambda function %v added to user pool %v to handle the MigrateUser trigger.\n",
		functionArn, userPoolId)

	log.Println(strings.Repeat("-", 88))
}

// SignInUser adds a new user to the known users table and signs that user in to Amazon Cognito.
func (runner *MigrateUser) SignInUser(ctx context.Context, usersTable string, clientId string) (bool, actions.User) {
	log.Println("Let's sign in a user to your Cognito user pool. When the username and email matches an entry in the\n" +
		"DynamoDB known users table, the email is automatically verified and the user is migrated to the Cognito user pool.")

	user := actions.User{}
	user.UserName = runner.questioner.Ask("\nEnter a username:")
	user.UserEmail = runner.questioner.Ask("\nEnter an email that you own. This email will be used to confirm user migration\n" +
		"during this example:")

	runner.helper.AddKnownUser(ctx, usersTable, user)

	var err error
	var resetRequired *types.PasswordResetRequiredException
	var authResult *types.AuthenticationResultType
	signedIn := false
	for !signedIn && resetRequired == nil {
		log.Printf("Signing in to Cognito as user '%v'. The expected result is a PasswordResetRequiredException.\n\n", user.UserName)
		authResult, err = runner.cognitoActor.SignIn(ctx, clientId, user.UserName, "_")
		if err != nil {
			if errors.As(err, &resetRequired) {
				log.Printf("\nUser '%v' is not in the Cognito user pool but was found in the DynamoDB known users table.\n"+
					"User migration is started and a password reset is required.", user.UserName)
			} else {
				panic(err)
			}
		} else {
			log.Printf("User '%v' successfully signed in. This is unexpected and probably means you have not\n"+
				"cleaned up a previous run of this scenario, so the user exist in the Cognito user pool.\n"+
				"You can continue this example and select to clean up resources, or manually remove\n"+
				"the user from your user pool and try again.", user.UserName)
			runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)
			signedIn = true
		}
	}

	log.Println(strings.Repeat("-", 88))
	return resetRequired != nil, user
}

// ResetPassword starts a password recovery flow.
func (runner *MigrateUser) ResetPassword(ctx context.Context, clientId string, user actions.User) {
	wantCode := runner.questioner.AskBool(fmt.Sprintf("In order to migrate the user to Cognito, you must be able to receive a confirmation\n"+
		"code by email at %v. Do you want to send a code (y/n)?", user.UserEmail), "y")
	if !wantCode {
		log.Println("To complete this example and successfully migrate a user to Cognito, you must enter an email\n" +
			"you own that can receive a confirmation code.")
		return
	}
	codeDelivery, err := runner.cognitoActor.ForgotPassword(ctx, clientId, user.UserName)
	if err != nil {
		panic(err)
	}
	log.Printf("\nA confirmation code has been sent to %v.", *codeDelivery.Destination)
	code := runner.questioner.Ask("Check your email and enter it here:")

	confirmed := false
	password := runner.questioner.AskPassword("\nEnter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !confirmed {
		log.Printf("\nConfirming password reset for user '%v'.\n", user.UserName)
		err = runner.cognitoActor.ConfirmForgotPassword(ctx, clientId, code, user.UserName, password)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("\nEnter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			confirmed = true
		}
	}
	log.Printf("User '%v' successfully confirmed and migrated.\n", user.UserName)
	log.Println("Signing in with your username and password...")
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, user.UserName, password)
	if err != nil {
		panic(err)
	}
	log.Printf("Successfully signed in. Your access token starts with: %v...\n", (*authResult.AccessToken)[:10])
	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)

	log.Println(strings.Repeat("-", 88))
}

// Run runs the scenario.
func (runner *MigrateUser) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]

	runner.AddMigrateUserTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["MigrateUserFunctionArn"])
	runner.resources.triggers = append(runner.resources.triggers, actions.UserMigration)
	resetNeeded, user := runner.SignInUser(ctx, stackOutputs["TableName"], stackOutputs["UserPoolClientId"])
	if resetNeeded {
		runner.helper.ListRecentLogEvents(ctx, stackOutputs["MigrateUserFunction"])
		runner.ResetPassword(ctx, stackOutputs["UserPoolClientId"], user)
	}

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `MigrateUser` 트리거를 처리합니다.  

```
import (
	"context"
	"log"
	"os"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
)

const TABLE_NAME = "TABLE_NAME"

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string `dynamodbav:"UserName"`
	UserEmail string `dynamodbav:"UserEmail"`
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the MigrateUser event by looking up a user in an Amazon DynamoDB table and
// specifying whether they should be migrated to the user pool.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsMigrateUser) (events.CognitoEventUserPoolsMigrateUser, error) {
	log.Printf("Received migrate trigger from %v for user '%v'", event.TriggerSource, event.UserName)
	if event.TriggerSource != "UserMigration_Authentication" {
		return event, nil
	}
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserName: event.UserName,
	}
	log.Printf("Looking up user '%v' in table %v.\n", user.UserName, tableName)
	filterEx := expression.Name("UserName").Equal(expression.Value(user.UserName))
	expr, err := expression.NewBuilder().WithFilter(filterEx).Build()
	if err != nil {
		log.Printf("Error building expression to query for user '%v'.\n", user.UserName)
		return event, err
	}
	output, err := h.dynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName:                 aws.String(tableName),
		FilterExpression:          expr.Filter(),
		ExpressionAttributeNames:  expr.Names(),
		ExpressionAttributeValues: expr.Values(),
	})
	if err != nil {
		log.Printf("Error looking up user '%v'.\n", user.UserName)
		return event, err
	}
	if len(output.Items) == 0 {
		log.Printf("User '%v' not found, not migrating user.\n", user.UserName)
		return event, err
	}

	var users []UserInfo
	err = attributevalue.UnmarshalListOfMaps(output.Items, &users)
	if err != nil {
		log.Printf("Couldn't unmarshal DynamoDB items. Here's why: %v\n", err)
		return event, err
	}

	user = users[0]
	log.Printf("UserName '%v' found with email %v. User is migrated and must reset password.\n", user.UserName, user.UserEmail)
	event.CognitoEventUserPoolsMigrateUserResponse.UserAttributes = map[string]string{
		"email":          user.UserEmail,
		"email_verified": "true", // email_verified is required for the forgot password flow.
	}
	event.CognitoEventUserPoolsMigrateUserResponse.FinalUserStatus = "RESET_REQUIRED"
	event.CognitoEventUserPoolsMigrateUserResponse.MessageAction = "SUPPRESS"

	return event, err
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [ConfirmForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ConfirmForgotPassword)
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [ForgotPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.ForgotPassword)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [SignUp](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.SignUp)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

### Amazon Cognito 사용자 인증 후 Lambda 함수를 사용하여 사용자 지정 활동 데이터 작성
<a name="cross_CognitoCustomActivityLog_go_2_topic"></a>

다음 코드 예제는 Amazon Cognito 사용자 인증 후 Lambda 함수를 사용하여 사용자 지정 작업 데이터를 쓰는 방법을 보여줍니다.
+ 관리자 함수를 사용하여 사용자 풀에 사용자를 추가합니다.
+ `PostAuthentication` 트리거에 대해 Lambda 함수를 호출하도록 사용자 풀을 구성합니다.
+ 새로운 사용자를 Amazon Cognito에 로그인시킵니다.
+ Lambda 함수는 CloudWatch Logs와 DynamoDB 테이블에 사용자 지정 정보를 작성합니다.
+ DynamoDB 테이블에서 사용자 지정 데이터를 가져오기 및 표시한 다음 리소스를 정리합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"errors"
	"log"
	"strings"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// ActivityLog separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type ActivityLog struct {
	helper       IScenarioHelper
	questioner   demotools.IQuestioner
	resources    Resources
	cognitoActor *actions.CognitoActions
}

// NewActivityLog constructs a new activity log runner.
func NewActivityLog(sdkConfig aws.Config, questioner demotools.IQuestioner, helper IScenarioHelper) ActivityLog {
	scenario := ActivityLog{
		helper:       helper,
		questioner:   questioner,
		resources:    Resources{},
		cognitoActor: &actions.CognitoActions{CognitoClient: cognitoidentityprovider.NewFromConfig(sdkConfig)},
	}
	scenario.resources.init(scenario.cognitoActor, questioner)
	return scenario
}

// AddUserToPool selects a user from the known users table and uses administrator credentials to add the user to the user pool.
func (runner *ActivityLog) AddUserToPool(ctx context.Context, userPoolId string, tableName string) (string, string) {
	log.Println("To facilitate this example, let's add a user to the user pool using administrator privileges.")
	users, err := runner.helper.GetKnownUsers(ctx, tableName)
	if err != nil {
		panic(err)
	}
	user := users.Users[0]
	log.Printf("Adding known user %v to the user pool.\n", user.UserName)
	err = runner.cognitoActor.AdminCreateUser(ctx, userPoolId, user.UserName, user.UserEmail)
	if err != nil {
		panic(err)
	}
	pwSet := false
	password := runner.questioner.AskPassword("\nEnter a password that has at least eight characters, uppercase, lowercase, numbers and symbols.\n"+
		"(the password will not display as you type):", 8)
	for !pwSet {
		log.Printf("\nSetting password for user '%v'.\n", user.UserName)
		err = runner.cognitoActor.AdminSetUserPassword(ctx, userPoolId, user.UserName, password)
		if err != nil {
			var invalidPassword *types.InvalidPasswordException
			if errors.As(err, &invalidPassword) {
				password = runner.questioner.AskPassword("\nEnter another password:", 8)
			} else {
				panic(err)
			}
		} else {
			pwSet = true
		}
	}

	log.Println(strings.Repeat("-", 88))

	return user.UserName, password
}

// AddActivityLogTrigger adds a Lambda handler as an invocation target for the PostAuthentication trigger.
func (runner *ActivityLog) AddActivityLogTrigger(ctx context.Context, userPoolId string, activityLogArn string) {
	log.Println("Let's add a Lambda function to handle the PostAuthentication trigger from Cognito.\n" +
		"This trigger happens after a user is authenticated, and lets your function take action, such as logging\n" +
		"the outcome.")
	err := runner.cognitoActor.UpdateTriggers(
		ctx, userPoolId,
		actions.TriggerInfo{Trigger: actions.PostAuthentication, HandlerArn: aws.String(activityLogArn)})
	if err != nil {
		panic(err)
	}
	runner.resources.triggers = append(runner.resources.triggers, actions.PostAuthentication)
	log.Printf("Lambda function %v added to user pool %v to handle PostAuthentication Cognito trigger.\n",
		activityLogArn, userPoolId)

	log.Println(strings.Repeat("-", 88))
}

// SignInUser signs in as the specified user.
func (runner *ActivityLog) SignInUser(ctx context.Context, clientId string, userName string, password string) {
	log.Printf("Now we'll sign in user %v and check the results in the logs and the DynamoDB table.", userName)
	runner.questioner.Ask("Press Enter when you're ready.")
	authResult, err := runner.cognitoActor.SignIn(ctx, clientId, userName, password)
	if err != nil {
		panic(err)
	}
	log.Println("Sign in successful.",
		"The PostAuthentication Lambda handler writes custom information to CloudWatch Logs.")

	runner.resources.userAccessTokens = append(runner.resources.userAccessTokens, *authResult.AccessToken)
}

// GetKnownUserLastLogin gets the login info for a user from the Amazon DynamoDB table and displays it.
func (runner *ActivityLog) GetKnownUserLastLogin(ctx context.Context, tableName string, userName string) {
	log.Println("The PostAuthentication handler also writes login data to the DynamoDB table.")
	runner.questioner.Ask("Press Enter when you're ready to continue.")
	users, err := runner.helper.GetKnownUsers(ctx, tableName)
	if err != nil {
		panic(err)
	}
	for _, user := range users.Users {
		if user.UserName == userName {
			log.Println("The last login info for the user in the known users table is:")
			log.Printf("\t%+v", *user.LastLogin)
		}
	}
	log.Println(strings.Repeat("-", 88))
}

// Run runs the scenario.
func (runner *ActivityLog) Run(ctx context.Context, stackName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			runner.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome\n")

	log.Println(strings.Repeat("-", 88))

	stackOutputs, err := runner.helper.GetStackOutputs(ctx, stackName)
	if err != nil {
		panic(err)
	}
	runner.resources.userPoolId = stackOutputs["UserPoolId"]
	runner.helper.PopulateUserTable(ctx, stackOutputs["TableName"])
	userName, password := runner.AddUserToPool(ctx, stackOutputs["UserPoolId"], stackOutputs["TableName"])

	runner.AddActivityLogTrigger(ctx, stackOutputs["UserPoolId"], stackOutputs["ActivityLogFunctionArn"])
	runner.SignInUser(ctx, stackOutputs["UserPoolClientId"], userName, password)
	runner.helper.ListRecentLogEvents(ctx, stackOutputs["ActivityLogFunction"])
	runner.GetKnownUserLastLogin(ctx, stackOutputs["TableName"], userName)

	runner.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
Lambda 함수를 사용하여 `PostAuthentication` 트리거를 처리합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"os"
	"time"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	dynamodbtypes "github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

const TABLE_NAME = "TABLE_NAME"

// LoginInfo defines structured login data that can be marshalled to a DynamoDB format.
type LoginInfo struct {
	UserPoolId string `dynamodbav:"UserPoolId"`
	ClientId   string `dynamodbav:"ClientId"`
	Time       string `dynamodbav:"Time"`
}

// UserInfo defines structured user data that can be marshalled to a DynamoDB format.
type UserInfo struct {
	UserName  string    `dynamodbav:"UserName"`
	UserEmail string    `dynamodbav:"UserEmail"`
	LastLogin LoginInfo `dynamodbav:"LastLogin"`
}

// GetKey marshals the user email value to a DynamoDB key format.
func (user UserInfo) GetKey() map[string]dynamodbtypes.AttributeValue {
	userEmail, err := attributevalue.Marshal(user.UserEmail)
	if err != nil {
		panic(err)
	}
	return map[string]dynamodbtypes.AttributeValue{"UserEmail": userEmail}
}

type handler struct {
	dynamoClient *dynamodb.Client
}

// HandleRequest handles the PostAuthentication event by writing custom data to the logs and
// to an Amazon DynamoDB table.
func (h *handler) HandleRequest(ctx context.Context, event events.CognitoEventUserPoolsPostAuthentication) (events.CognitoEventUserPoolsPostAuthentication, error) {
	log.Printf("Received post authentication trigger from %v for user '%v'", event.TriggerSource, event.UserName)
	tableName := os.Getenv(TABLE_NAME)
	user := UserInfo{
		UserName:  event.UserName,
		UserEmail: event.Request.UserAttributes["email"],
		LastLogin: LoginInfo{
			UserPoolId: event.UserPoolID,
			ClientId:   event.CallerContext.ClientID,
			Time:       time.Now().Format(time.UnixDate),
		},
	}
	// Write to CloudWatch Logs.
	fmt.Printf("%#v", user)

	// Also write to an external system. This examples uses DynamoDB to demonstrate.
	userMap, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshal to DynamoDB map. Here's why: %v\n", err)
	} else if len(userMap) == 0 {
		log.Printf("User info marshaled to an empty map.")
	} else {
		_, err := h.dynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
			Item:      userMap,
			TableName: aws.String(tableName),
		})
		if err != nil {
			log.Printf("Couldn't write to DynamoDB. Here's why: %v\n", err)
		} else {
			log.Printf("Wrote user info to DynamoDB table %v.\n", tableName)
		}
	}

	return event, nil
}

func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Panicln(err)
	}
	h := handler{
		dynamoClient: dynamodb.NewFromConfig(sdkConfig),
	}
	lambda.Start(h.HandleRequest)
}
```
일반적인 작업을 수행하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"
	"strings"
	"time"
	"user_pools_and_lambda_triggers/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// IScenarioHelper defines common functions used by the workflows in this example.
type IScenarioHelper interface {
	Pause(secs int)
	GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error)
	PopulateUserTable(ctx context.Context, tableName string)
	GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error)
	AddKnownUser(ctx context.Context, tableName string, user actions.User)
	ListRecentLogEvents(ctx context.Context, functionName string)
}

// ScenarioHelper contains AWS wrapper structs used by the workflows in this example.
type ScenarioHelper struct {
	questioner  demotools.IQuestioner
	dynamoActor *actions.DynamoActions
	cfnActor    *actions.CloudFormationActions
	cwlActor    *actions.CloudWatchLogsActions
	isTestRun   bool
}

// NewScenarioHelper constructs a new scenario helper.
func NewScenarioHelper(sdkConfig aws.Config, questioner demotools.IQuestioner) ScenarioHelper {
	scenario := ScenarioHelper{
		questioner:  questioner,
		dynamoActor: &actions.DynamoActions{DynamoClient: dynamodb.NewFromConfig(sdkConfig)},
		cfnActor:    &actions.CloudFormationActions{CfnClient: cloudformation.NewFromConfig(sdkConfig)},
		cwlActor:    &actions.CloudWatchLogsActions{CwlClient: cloudwatchlogs.NewFromConfig(sdkConfig)},
	}
	return scenario
}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	if !helper.isTestRun {
		time.Sleep(time.Duration(secs) * time.Second)
	}
}

// GetStackOutputs gets the outputs from the specified CloudFormation stack in a structured format.
func (helper ScenarioHelper) GetStackOutputs(ctx context.Context, stackName string) (actions.StackOutputs, error) {
	return helper.cfnActor.GetOutputs(ctx, stackName), nil
}

// PopulateUserTable fills the known user table with example data.
func (helper ScenarioHelper) PopulateUserTable(ctx context.Context, tableName string) {
	log.Printf("First, let's add some users to the DynamoDB %v table we'll use for this example.\n", tableName)
	err := helper.dynamoActor.PopulateTable(ctx, tableName)
	if err != nil {
		panic(err)
	}
}

// GetKnownUsers gets the users from the known users table in a structured format.
func (helper ScenarioHelper) GetKnownUsers(ctx context.Context, tableName string) (actions.UserList, error) {
	knownUsers, err := helper.dynamoActor.Scan(ctx, tableName)
	if err != nil {
		log.Printf("Couldn't get known users from table %v. Here's why: %v\n", tableName, err)
	}
	return knownUsers, err
}

// AddKnownUser adds a user to the known users table.
func (helper ScenarioHelper) AddKnownUser(ctx context.Context, tableName string, user actions.User) {
	log.Printf("Adding user '%v' with email '%v' to the DynamoDB known users table...\n",
		user.UserName, user.UserEmail)
	err := helper.dynamoActor.AddUser(ctx, tableName, user)
	if err != nil {
		panic(err)
	}
}

// ListRecentLogEvents gets the most recent log stream and events for the specified Lambda function and displays them.
func (helper ScenarioHelper) ListRecentLogEvents(ctx context.Context, functionName string) {
	log.Println("Waiting a few seconds to let Lambda write to CloudWatch Logs...")
	helper.Pause(10)
	log.Println("Okay, let's check the logs to find what's happened recently with your Lambda function.")
	logStream, err := helper.cwlActor.GetLatestLogStream(ctx, functionName)
	if err != nil {
		panic(err)
	}
	log.Printf("Getting some recent events from log stream %v\n", *logStream.LogStreamName)
	events, err := helper.cwlActor.GetLogEvents(ctx, functionName, *logStream.LogStreamName, 10)
	if err != nil {
		panic(err)
	}
	for _, event := range events {
		log.Printf("\t%v", *event.Message)
	}
	log.Println(strings.Repeat("-", 88))
}
```
Amazon Cognito 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}



// SignUp signs up a user with Amazon Cognito.
func (actor CognitoActions) SignUp(ctx context.Context, clientId string, userName string, password string, userEmail string) (bool, error) {
	confirmed := false
	output, err := actor.CognitoClient.SignUp(ctx, &cognitoidentityprovider.SignUpInput{
		ClientId: aws.String(clientId),
		Password: aws.String(password),
		Username: aws.String(userName),
		UserAttributes: []types.AttributeType{
			{Name: aws.String("email"), Value: aws.String(userEmail)},
		},
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't sign up user %v. Here's why: %v\n", userName, err)
		}
	} else {
		confirmed = output.UserConfirmed
	}
	return confirmed, err
}



// SignIn signs in a user to Amazon Cognito using a username and password authentication flow.
func (actor CognitoActions) SignIn(ctx context.Context, clientId string, userName string, password string) (*types.AuthenticationResultType, error) {
	var authResult *types.AuthenticationResultType
	output, err := actor.CognitoClient.InitiateAuth(ctx, &cognitoidentityprovider.InitiateAuthInput{
		AuthFlow:       "USER_PASSWORD_AUTH",
		ClientId:       aws.String(clientId),
		AuthParameters: map[string]string{"USERNAME": userName, "PASSWORD": password},
	})
	if err != nil {
		var resetRequired *types.PasswordResetRequiredException
		if errors.As(err, &resetRequired) {
			log.Println(*resetRequired.Message)
		} else {
			log.Printf("Couldn't sign in user %v. Here's why: %v\n", userName, err)
		}
	} else {
		authResult = output.AuthenticationResult
	}
	return authResult, err
}



// ForgotPassword starts a password recovery flow for a user. This flow typically sends a confirmation code
// to the user's configured notification destination, such as email.
func (actor CognitoActions) ForgotPassword(ctx context.Context, clientId string, userName string) (*types.CodeDeliveryDetailsType, error) {
	output, err := actor.CognitoClient.ForgotPassword(ctx, &cognitoidentityprovider.ForgotPasswordInput{
		ClientId: aws.String(clientId),
		Username: aws.String(userName),
	})
	if err != nil {
		log.Printf("Couldn't start password reset for user '%v'. Here;s why: %v\n", userName, err)
	}
	return output.CodeDeliveryDetails, err
}



// ConfirmForgotPassword confirms a user with a confirmation code and a new password.
func (actor CognitoActions) ConfirmForgotPassword(ctx context.Context, clientId string, code string, userName string, password string) error {
	_, err := actor.CognitoClient.ConfirmForgotPassword(ctx, &cognitoidentityprovider.ConfirmForgotPasswordInput{
		ClientId:         aws.String(clientId),
		ConfirmationCode: aws.String(code),
		Password:         aws.String(password),
		Username:         aws.String(userName),
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't confirm user %v. Here's why: %v", userName, err)
		}
	}
	return err
}



// DeleteUser removes a user from the user pool.
func (actor CognitoActions) DeleteUser(ctx context.Context, userAccessToken string) error {
	_, err := actor.CognitoClient.DeleteUser(ctx, &cognitoidentityprovider.DeleteUserInput{
		AccessToken: aws.String(userAccessToken),
	})
	if err != nil {
		log.Printf("Couldn't delete user. Here's why: %v\n", err)
	}
	return err
}



// AdminCreateUser uses administrator credentials to add a user to a user pool. This method leaves the user
// in a state that requires they enter a new password next time they sign in.
func (actor CognitoActions) AdminCreateUser(ctx context.Context, userPoolId string, userName string, userEmail string) error {
	_, err := actor.CognitoClient.AdminCreateUser(ctx, &cognitoidentityprovider.AdminCreateUserInput{
		UserPoolId:     aws.String(userPoolId),
		Username:       aws.String(userName),
		MessageAction:  types.MessageActionTypeSuppress,
		UserAttributes: []types.AttributeType{{Name: aws.String("email"), Value: aws.String(userEmail)}},
	})
	if err != nil {
		var userExists *types.UsernameExistsException
		if errors.As(err, &userExists) {
			log.Printf("User %v already exists in the user pool.", userName)
			err = nil
		} else {
			log.Printf("Couldn't create user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}



// AdminSetUserPassword uses administrator credentials to set a password for a user without requiring a
// temporary password.
func (actor CognitoActions) AdminSetUserPassword(ctx context.Context, userPoolId string, userName string, password string) error {
	_, err := actor.CognitoClient.AdminSetUserPassword(ctx, &cognitoidentityprovider.AdminSetUserPasswordInput{
		Password:   aws.String(password),
		UserPoolId: aws.String(userPoolId),
		Username:   aws.String(userName),
		Permanent:  true,
	})
	if err != nil {
		var invalidPassword *types.InvalidPasswordException
		if errors.As(err, &invalidPassword) {
			log.Println(*invalidPassword.Message)
		} else {
			log.Printf("Couldn't set password for user %v. Here's why: %v\n", userName, err)
		}
	}
	return err
}
```
DynamoDB 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

// DynamoActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type DynamoActions struct {
	DynamoClient *dynamodb.Client
}

// User defines structured user data.
type User struct {
	UserName  string
	UserEmail string
	LastLogin *LoginInfo `dynamodbav:",omitempty"`
}

// LoginInfo defines structured custom login data.
type LoginInfo struct {
	UserPoolId string
	ClientId   string
	Time       string
}

// UserList defines a list of users.
type UserList struct {
	Users []User
}

// UserNameList returns the usernames contained in a UserList as a list of strings.
func (users *UserList) UserNameList() []string {
	names := make([]string, len(users.Users))
	for i := 0; i < len(users.Users); i++ {
		names[i] = users.Users[i].UserName
	}
	return names
}

// PopulateTable adds a set of test users to the table.
func (actor DynamoActions) PopulateTable(ctx context.Context, tableName string) error {
	var err error
	var item map[string]types.AttributeValue
	var writeReqs []types.WriteRequest
	for i := 1; i < 4; i++ {
		item, err = attributevalue.MarshalMap(User{UserName: fmt.Sprintf("test_user_%v", i), UserEmail: fmt.Sprintf("test_email_%v@example.com", i)})
		if err != nil {
			log.Printf("Couldn't marshall user into DynamoDB format. Here's why: %v\n", err)
			return err
		}
		writeReqs = append(writeReqs, types.WriteRequest{PutRequest: &types.PutRequest{Item: item}})
	}
	_, err = actor.DynamoClient.BatchWriteItem(ctx, &dynamodb.BatchWriteItemInput{
		RequestItems: map[string][]types.WriteRequest{tableName: writeReqs},
	})
	if err != nil {
		log.Printf("Couldn't populate table %v with users. Here's why: %v\n", tableName, err)
	}
	return err
}

// Scan scans the table for all items.
func (actor DynamoActions) Scan(ctx context.Context, tableName string) (UserList, error) {
	var userList UserList
	output, err := actor.DynamoClient.Scan(ctx, &dynamodb.ScanInput{
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't scan table %v for items. Here's why: %v\n", tableName, err)
	} else {
		err = attributevalue.UnmarshalListOfMaps(output.Items, &userList.Users)
		if err != nil {
			log.Printf("Couldn't unmarshal items into users. Here's why: %v\n", err)
		}
	}
	return userList, err
}

// AddUser adds a user item to a table.
func (actor DynamoActions) AddUser(ctx context.Context, tableName string, user User) error {
	userItem, err := attributevalue.MarshalMap(user)
	if err != nil {
		log.Printf("Couldn't marshall user to item. Here's why: %v\n", err)
	}
	_, err = actor.DynamoClient.PutItem(ctx, &dynamodb.PutItemInput{
		Item:      userItem,
		TableName: aws.String(tableName),
	})
	if err != nil {
		log.Printf("Couldn't put item in table %v. Here's why: %v", tableName, err)
	}
	return err
}
```
CloudWatch Logs 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
)

type CloudWatchLogsActions struct {
	CwlClient *cloudwatchlogs.Client
}

// GetLatestLogStream gets the most recent log stream for a Lambda function.
func (actor CloudWatchLogsActions) GetLatestLogStream(ctx context.Context, functionName string) (types.LogStream, error) {
	var logStream types.LogStream
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.DescribeLogStreams(ctx, &cloudwatchlogs.DescribeLogStreamsInput{
		Descending:   aws.Bool(true),
		Limit:        aws.Int32(1),
		LogGroupName: aws.String(logGroupName),
		OrderBy:      types.OrderByLastEventTime,
	})
	if err != nil {
		log.Printf("Couldn't get log streams for log group %v. Here's why: %v\n", logGroupName, err)
	} else {
		logStream = output.LogStreams[0]
	}
	return logStream, err
}

// GetLogEvents gets the most recent eventCount events from the specified log stream.
func (actor CloudWatchLogsActions) GetLogEvents(ctx context.Context, functionName string, logStreamName string, eventCount int32) (
	[]types.OutputLogEvent, error) {
	var events []types.OutputLogEvent
	logGroupName := fmt.Sprintf("/aws/lambda/%s", functionName)
	output, err := actor.CwlClient.GetLogEvents(ctx, &cloudwatchlogs.GetLogEventsInput{
		LogStreamName: aws.String(logStreamName),
		Limit:         aws.Int32(eventCount),
		LogGroupName:  aws.String(logGroupName),
	})
	if err != nil {
		log.Printf("Couldn't get log event for log stream %v. Here's why: %v\n", logStreamName, err)
	} else {
		events = output.Events
	}
	return events, err
}
```
 CloudFormation 작업을 래핑하는 구조체를 생성합니다.  

```
import (
	"context"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cloudformation"
)

// StackOutputs defines a map of outputs from a specific stack.
type StackOutputs map[string]string

type CloudFormationActions struct {
	CfnClient *cloudformation.Client
}

// GetOutputs gets the outputs from a CloudFormation stack and puts them into a structured format.
func (actor CloudFormationActions) GetOutputs(ctx context.Context, stackName string) StackOutputs {
	output, err := actor.CfnClient.DescribeStacks(ctx, &cloudformation.DescribeStacksInput{
		StackName: aws.String(stackName),
	})
	if err != nil || len(output.Stacks) == 0 {
		log.Panicf("Couldn't find a CloudFormation stack named %v. Here's why: %v\n", stackName, err)
	}
	stackOutputs := StackOutputs{}
	for _, out := range output.Stacks[0].Outputs {
		stackOutputs[*out.OutputKey] = *out.OutputValue
	}
	return stackOutputs
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"user_pools_and_lambda_triggers/actions"

	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	userPoolId       string
	userAccessTokens []string
	triggers         []actions.Trigger

	cognitoActor *actions.CognitoActions
	questioner   demotools.IQuestioner
}

func (resources *Resources) init(cognitoActor *actions.CognitoActions, questioner demotools.IQuestioner) {
	resources.userAccessTokens = []string{}
	resources.triggers = []actions.Trigger{}
	resources.cognitoActor = cognitoActor
	resources.questioner = questioner
}

// Cleanup deletes all AWS resources created during an example.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources \n" +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if wantDelete {
		for _, accessToken := range resources.userAccessTokens {
			err := resources.cognitoActor.DeleteUser(ctx, accessToken)
			if err != nil {
				log.Println("Couldn't delete user during cleanup.")
				panic(err)
			}
			log.Println("Deleted user.")
		}
		triggerList := make([]actions.TriggerInfo, len(resources.triggers))
		for i := 0; i < len(resources.triggers); i++ {
			triggerList[i] = actions.TriggerInfo{Trigger: resources.triggers[i], HandlerArn: nil}
		}
		err := resources.cognitoActor.UpdateTriggers(ctx, resources.userPoolId, triggerList...)
		if err != nil {
			log.Println("Couldn't update Cognito triggers during cleanup.")
			panic(err)
		}
		log.Println("Removed Cognito triggers from user pool.")
	} else {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [AdminCreateUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminCreateUser)
  + [AdminSetUserPassword](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.AdminSetUserPassword)
  + [DeleteUser](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.DeleteUser)
  + [InitiateAuth](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.InitiateAuth)
  + [UpdateUserPool](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider#Client.UpdateUserPool)

## 서버리스 예제
<a name="serverless_examples"></a>

### Lambda 함수를 사용하여 Amazon RDS 데이터베이스에 연결
<a name="serverless_connect_RDS_Lambda_go_2_topic"></a>

다음 코드 예제는 RDS 데이터베이스에 연결하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 간단한 데이터베이스 요청을 하고 결과를 반환합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-connect-rds-iam) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda 함수에서 Amazon RDS 데이터베이스에 연결  

```
/*
Golang v2 code here.
*/

package main

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"os"

	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/rds/auth"
	_ "github.com/go-sql-driver/mysql"
)

type MyEvent struct {
	Name string `json:"name"`
}

func HandleRequest(event *MyEvent) (map[string]interface{}, error) {

	var dbName string = os.Getenv("DatabaseName")
	var dbUser string = os.Getenv("DatabaseUser")
	var dbHost string = os.Getenv("DBHost") // Add hostname without https
	var dbPort int = os.Getenv("Port")      // Add port number
	var dbEndpoint string = fmt.Sprintf("%s:%d", dbHost, dbPort)
	var region string = os.Getenv("AWS_REGION")

	cfg, err := config.LoadDefaultConfig(context.TODO())
	if err != nil {
		panic("configuration error: " + err.Error())
	}

	authenticationToken, err := auth.BuildAuthToken(
		context.TODO(), dbEndpoint, region, dbUser, cfg.Credentials)
	if err != nil {
		panic("failed to create authentication token: " + err.Error())
	}

	dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s?tls=true&allowCleartextPasswords=true",
		dbUser, authenticationToken, dbEndpoint, dbName,
	)

	db, err := sql.Open("mysql", dsn)
	if err != nil {
		panic(err)
	}

	defer db.Close()

	var sum int
	err = db.QueryRow("SELECT ?+? AS sum", 3, 2).Scan(&sum)
	if err != nil {
		panic(err)
	}
	s := fmt.Sprint(sum)
	message := fmt.Sprintf("The selected sum is: %s", s)

	messageBytes, err := json.Marshal(message)
	if err != nil {
		return nil, err
	}

	messageString := string(messageBytes)
	return map[string]interface{}{
		"statusCode": 200,
		"headers":    map[string]string{"Content-Type": "application/json"},
		"body":       messageString,
	}, nil
}

func main() {
	lambda.Start(HandleRequest)
}
```

### Kinesis 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_Kinesis_Lambda_go_2_topic"></a>

다음 코드 예제에서는 Kinesis 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 Kinesis 페이로드를 검색하고, Base64에서 디코딩하고, 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Kinesis 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"log"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, kinesisEvent events.KinesisEvent) error {
	if len(kinesisEvent.Records) == 0 {
		log.Printf("empty Kinesis event received")
		return nil
	}

	for _, record := range kinesisEvent.Records {
		log.Printf("processed Kinesis event with EventId: %v", record.EventID)
		recordDataBytes := record.Kinesis.Data
		recordDataText := string(recordDataBytes)
		log.Printf("record data: %v", recordDataText)
		// TODO: Do interesting work based on the new data
	}
	log.Printf("successfully processed %v records", len(kinesisEvent.Records))
	return nil
}

func main() {
	lambda.Start(handler)
}
```

### DynamoDB 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_DynamoDB_Lambda_go_2_topic"></a>

다음 코드 예제에서는 DynamoDB 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 DynamoDB 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 DynamoDB 이벤트 사용.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-lambda-go/events"
	"fmt"
)

func HandleRequest(ctx context.Context, event events.DynamoDBEvent) (*string, error) {
	if len(event.Records) == 0 {
		return nil, fmt.Errorf("received empty event")
	}

	for _, record := range event.Records {
	 	LogDynamoDBRecord(record)
	}

	message := fmt.Sprintf("Records processed: %d", len(event.Records))
	return &message, nil
}

func main() {
	lambda.Start(HandleRequest)
}

func LogDynamoDBRecord(record events.DynamoDBEventRecord){
	fmt.Println(record.EventID)
	fmt.Println(record.EventName)
	fmt.Printf("%+v\n", record.Change)
}
```

### Amazon DocumentDB 트리거에서 간접적으로 Lambda 함수 호출
<a name="serverless_DocumentDB_Lambda_go_2_topic"></a>

다음 코드 예제에서는 DocumentDB 변경 스트림에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 DocumentDB 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-docdb-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Amazon DocumentDB 이벤트 소비  

```
package main

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/aws/aws-lambda-go/lambda"
)

type Event struct {
	Events []Record `json:"events"`
}

type Record struct {
	Event struct {
		OperationType string `json:"operationType"`
		NS            struct {
			DB   string `json:"db"`
			Coll string `json:"coll"`
		} `json:"ns"`
		FullDocument interface{} `json:"fullDocument"`
	} `json:"event"`
}

func main() {
	lambda.Start(handler)
}

func handler(ctx context.Context, event Event) (string, error) {
	fmt.Println("Loading function")
	for _, record := range event.Events {
		logDocumentDBEvent(record)
	}

	return "OK", nil
}

func logDocumentDBEvent(record Record) {
	fmt.Printf("Operation type: %s\n", record.Event.OperationType)
	fmt.Printf("db: %s\n", record.Event.NS.DB)
	fmt.Printf("collection: %s\n", record.Event.NS.Coll)
	docBytes, _ := json.MarshalIndent(record.Event.FullDocument, "", "  ")
	fmt.Printf("Full document: %s\n", string(docBytes))
}
```

### Amazon MSK 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_MSK_Lambda_go_2_topic"></a>

다음 코드 예제에서는 Amazon MSK 클러스터에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 MSK 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-msk-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Amazon MSK 이벤트 사용  

```
package main

import (
	"encoding/base64"
	"fmt"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(event events.KafkaEvent) {
	for key, records := range event.Records {
		fmt.Println("Key:", key)

		for _, record := range records {
			fmt.Println("Record:", record)

			decodedValue, _ := base64.StdEncoding.DecodeString(record.Value)
			message := string(decodedValue)
			fmt.Println("Message:", message)
		}
	}
}

func main() {
	lambda.Start(handler)
}
```

### Amazon S3 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_S3_Lambda_go_2_topic"></a>

다음 코드 예제는 S3 버킷에 객체를 업로드하여 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 해당 함수는 이벤트 파라미터에서 S3 버킷 이름과 객체 키를 검색하고 Amazon S3 API를 호출하여 객체의 콘텐츠 유형을 검색하고 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-s3-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 S3 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"log"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/s3"
)

func handler(ctx context.Context, s3Event events.S3Event) error {
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Printf("failed to load default config: %s", err)
		return err
	}
	s3Client := s3.NewFromConfig(sdkConfig)

	for _, record := range s3Event.Records {
		bucket := record.S3.Bucket.Name
		key := record.S3.Object.URLDecodedKey
		headOutput, err := s3Client.HeadObject(ctx, &s3.HeadObjectInput{
			Bucket: &bucket,
			Key:    &key,
		})
		if err != nil {
			log.Printf("error getting head of object %s/%s: %s", bucket, key, err)
			return err
		}
		log.Printf("successfully retrieved %s/%s of type %s", bucket, key, *headOutput.ContentType)
	}

	return nil
}

func main() {
	lambda.Start(handler)
}
```

### Amazon SNS 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_SNS_Lambda_go_2_topic"></a>

다음 코드 예제에서는 SNS 주제의 메시지를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 함수는 이벤트 파라미터에서 메시지를 검색하고 각 메시지의 내용을 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sns-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SNS 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, snsEvent events.SNSEvent) {
	for _, record := range snsEvent.Records {
		processMessage(record)
	}
	fmt.Println("done")
}

func processMessage(record events.SNSEventRecord) {
	message := record.SNS.Message
	fmt.Printf("Processed message: %s\n", message)
	// TODO: Process your record here
}

func main() {
	lambda.Start(handler)
}
```

### Amazon SQS 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_SQS_Lambda_go_2_topic"></a>

다음 코드 예제는 SQS 대기열에서 메시지를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 함수는 이벤트 파라미터에서 메시지를 검색하고 각 메시지의 내용을 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sqs-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SQS 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package integration_sqs_to_lambda

import (
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(event events.SQSEvent) error {
	for _, record := range event.Records {
		err := processMessage(record)
		if err != nil {
			return err
		}
	}
	fmt.Println("done")
	return nil
}

func processMessage(record events.SQSMessage) error {
	fmt.Printf("Processed message %s\n", record.Body)
	// TODO: Do interesting work based on the new message
	return nil
}

func main() {
	lambda.Start(handler)
}
```

### Kinesis 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_Kinesis_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제는 Kinesis 스트림에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda-with-batch-item-handling) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Kinesis 배치 항목 실패를 보고합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, kinesisEvent events.KinesisEvent) (map[string]interface{}, error) {
	batchItemFailures := []map[string]interface{}{}

	for _, record := range kinesisEvent.Records {
		curRecordSequenceNumber := ""

		// Process your record
		if /* Your record processing condition here */ {
			curRecordSequenceNumber = record.Kinesis.SequenceNumber
		}

		// Add a condition to check if the record processing failed
		if curRecordSequenceNumber != "" {
			batchItemFailures = append(batchItemFailures, map[string]interface{}{"itemIdentifier": curRecordSequenceNumber})
		}
	}

	kinesisBatchResponse := map[string]interface{}{
		"batchItemFailures": batchItemFailures,
	}
	return kinesisBatchResponse, nil
}

func main() {
	lambda.Start(handler)
}
```

### DynamoDB 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_DynamoDB_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제에서는 DynamoDB 스트림에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda-with-batch-item-handling) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 DynamoDB 배치 항목 실패 보고.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

type BatchItemFailure struct {
	ItemIdentifier string `json:"ItemIdentifier"`
}

type BatchResult struct {
	BatchItemFailures []BatchItemFailure `json:"BatchItemFailures"`
}

func HandleRequest(ctx context.Context, event events.DynamoDBEvent) (*BatchResult, error) {
	var batchItemFailures []BatchItemFailure
	curRecordSequenceNumber := ""

	for _, record := range event.Records {
		// Process your record
		curRecordSequenceNumber = record.Change.SequenceNumber
	}

	if curRecordSequenceNumber != "" {
		batchItemFailures = append(batchItemFailures, BatchItemFailure{ItemIdentifier: curRecordSequenceNumber})
	}
	
	batchResult := BatchResult{
		BatchItemFailures: batchItemFailures,
	}

	return &batchResult, nil
}

func main() {
	lambda.Start(HandleRequest)
}
```

### Amazon SQS 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_SQS_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제는 SQS 대기열에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-sqs-report-batch-item-failures) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SQS 배치 항목 실패 보고  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, sqsEvent events.SQSEvent) (map[string]interface{}, error) {
	batchItemFailures := []map[string]interface{}{}

	for _, message := range sqsEvent.Records {
		if len(message.Body) > 0 {
			// Your message processing condition here
			fmt.Printf("Successfully processed message: %s\n", message.Body)
		} else {
			// Message processing failed
			fmt.Printf("Failed to process message %s\n", message.MessageId)
			batchItemFailures = append(batchItemFailures, map[string]interface{}{"itemIdentifier": message.MessageId})
		}
	}

	sqsBatchResponse := map[string]interface{}{
		"batchItemFailures": batchItemFailures,
	}
	return sqsBatchResponse, nil
}

func main() {
	lambda.Start(handler)
}
```

## AWS 커뮤니티 기여
<a name="aws_community_contributions"></a>

### 서버리스 애플리케이션 빌드 및 테스트
<a name="tributary-lite_serverless-application_go_2_topic"></a>

다음 코드 예제에서는 Lambda 및 DynamoDB와 함께 API 게이트웨이를 사용하여 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.

**SDK for Go V2**  
 Go SDK를 사용하여 Lambda 및 DynamoDB가 포함된 API 게이트웨이로 구성된 서버리스 애플리케이션을 빌드하고 테스트하는 방법을 보여줍니다.  
 전체 소스 코드와 설정 및 실행 방법에 대한 지침은 [GitHub](https://github.com/aws-samples/serverless-go-demo)에서 전체 예제를 참조하세요.  

**이 예제에서 사용되는 서비스**
+ API Gateway
+ DynamoDB
+ Lambda

# SDK for Go V2를 사용한 Amazon MSK 예제
<a name="go_2_kafka_code_examples"></a>

다음 코드 예제에서는 Amazon MSK와 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [서버리스 예제](#serverless_examples)

## 서버리스 예제
<a name="serverless_examples"></a>

### Amazon MSK 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_MSK_Lambda_go_2_topic"></a>

다음 코드 예제에서는 Amazon MSK 클러스터에서 레코드를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 MSK 페이로드를 검색하고 레코드 콘텐츠를 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-msk-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 Amazon MSK 이벤트 사용  

```
package main

import (
	"encoding/base64"
	"fmt"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(event events.KafkaEvent) {
	for key, records := range event.Records {
		fmt.Println("Key:", key)

		for _, record := range records {
			fmt.Println("Record:", record)

			decodedValue, _ := base64.StdEncoding.DecodeString(record.Value)
			message := string(decodedValue)
			fmt.Println("Message:", message)
		}
	}
}

func main() {
	lambda.Start(handler)
}
```

# SDK for Go V2를 사용한 Partner Central 예제
<a name="go_2_partnercentral-selling_code_examples"></a>

다음 코드 예제에서는 Partner Central과 함께 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [작업](#actions)

## 작업
<a name="actions"></a>

### `GetOpportunity`
<a name="partnercentral-selling_GetOpportunity_go_2_topic"></a>

다음 코드 예시는 `GetOpportunity`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
기회를 가져옵니다.  

```
package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/partnercentralselling"
)

func main() {
	config, err := config.LoadDefaultConfig(context.TODO())

	if err != nil {
		log.Fatal(err)
	}

	config.Region = "us-east-1"

	client := partnercentralselling.NewFromConfig(config)

	output, err := client.GetOpportunity(context.TODO(), &partnercentralselling.GetOpportunityInput{
		Identifier: aws.String("O1111111"),
		Catalog:    aws.String("AWS"),
	})

	if err != nil {
		log.Fatal(err)
	}
	log.Println("printing opportuniy...\n")

	jsonOutput, err := json.MarshalIndent(output, "", "    ")

	fmt.Println(string(jsonOutput))
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetOpportunity](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/partnercentralselling#Client.GetOpportunity)를 참조하세요.

### `ListOpportunities`
<a name="partnercentral-selling_ListOpportunities_go_2_topic"></a>

다음 코드 예시는 `ListOpportunities`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
기회를 나열합니다.  

```
package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/partnercentralselling"
)

func main() {
	config, err := config.LoadDefaultConfig(context.TODO())

	if err != nil {
		log.Fatal(err)
	}

	config.Region = "us-east-1"

	client := partnercentralselling.NewFromConfig(config)

	output, err := client.ListOpportunities(context.TODO(), &partnercentralselling.ListOpportunitiesInput{
		MaxResults: aws.Int32(2),
		Catalog:    aws.String("AWS"),
	})

	if err != nil {
		log.Fatal(err)
	}

	jsonOutput, err := json.MarshalIndent(output, "", "    ")
	fmt.Println(string(jsonOutput))
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListOpportunities](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/partnercentralselling#Client.ListOpportunities)를 참조하세요.

# SDK for Go V2를 사용한 Amazon RDS 예제
<a name="go_2_rds_code_examples"></a>

다음 코드 예제에서는 Amazon RDS에서 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)
+ [서버리스 예제](#serverless_examples)

## 시작하기
<a name="get_started"></a>

### Hello Amazon RDS
<a name="rds_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon RDS 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/rds"
)

// main uses the AWS SDK for Go V2 to create an Amazon Relational Database Service (Amazon RDS)
// client and list up to 20 DB instances in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	rdsClient := rds.NewFromConfig(sdkConfig)
	const maxInstances = 20
	fmt.Printf("Let's list up to %v DB instances.\n", maxInstances)
	output, err := rdsClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{MaxRecords: aws.Int32(maxInstances)})
	if err != nil {
		fmt.Printf("Couldn't list DB instances: %v\n", err)
		return
	}
	if len(output.DBInstances) == 0 {
		fmt.Println("No DB instances found.")
	} else {
		for _, instance := range output.DBInstances {
			fmt.Printf("DB instance %v has database %v.\n", *instance.DBInstanceIdentifier,
				*instance.DBName)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="rds_Scenario_GetStartedInstances_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 사용자 지정 DB 파라미터 그룹을 생성하고 파라미터 값을 설정합니다.
+ 파라미터 그룹을 사용하도록 구성된 DB 인스턴스를 생성합니다. DB 인스턴스에는 데이터베이스도 포함되어 있습니다.
+ 인스턴스의 스냅샷을 만듭니다.
+ 인스턴스 및 파라미터 그룹을 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"sort"
	"strconv"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/rds/actions"
	"github.com/google/uuid"
)

// GetStartedInstances is an interactive example that shows you how to use the AWS SDK for Go
// with Amazon Relation Database Service (Amazon RDS) to do the following:
//
//  1. Create a custom DB parameter group and set parameter values.
//  2. Create a DB instance that is configured to use the parameter group. The DB instance
//     also contains a database.
//  3. Take a snapshot of the DB instance.
//  4. Delete the DB instance and parameter group.
type GetStartedInstances struct {
	sdkConfig  aws.Config
	instances  actions.DbInstances
	questioner demotools.IQuestioner
	helper     IScenarioHelper
	isTestRun  bool
}

// NewGetStartedInstances constructs a GetStartedInstances instance from a configuration.
// It uses the specified config to get an Amazon RDS
// client and create wrappers for the actions used in the scenario.
func NewGetStartedInstances(sdkConfig aws.Config, questioner demotools.IQuestioner,
	helper IScenarioHelper) GetStartedInstances {
	rdsClient := rds.NewFromConfig(sdkConfig)
	return GetStartedInstances{
		sdkConfig:  sdkConfig,
		instances:  actions.DbInstances{RdsClient: rdsClient},
		questioner: questioner,
		helper:     helper,
	}
}

// Run runs the interactive scenario.
func (scenario GetStartedInstances) Run(ctx context.Context, dbEngine string, parameterGroupName string,
	instanceName string, dbName string) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon Relational Database Service (Amazon RDS) DB Instance demo.")
	log.Println(strings.Repeat("-", 88))

	parameterGroup := scenario.CreateParameterGroup(ctx, dbEngine, parameterGroupName)
	scenario.SetUserParameters(ctx, parameterGroupName)
	instance := scenario.CreateInstance(ctx, instanceName, dbEngine, dbName, parameterGroup)
	scenario.DisplayConnection(instance)
	scenario.CreateSnapshot(ctx, instance)
	scenario.Cleanup(ctx, instance, parameterGroup)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}

// CreateParameterGroup shows how to get available engine versions for a specified
// database engine and create a DB parameter group that is compatible with a
// selected engine family.
func (scenario GetStartedInstances) CreateParameterGroup(ctx context.Context, dbEngine string,
	parameterGroupName string) *types.DBParameterGroup {

	log.Printf("Checking for an existing DB parameter group named %v.\n",
		parameterGroupName)
	parameterGroup, err := scenario.instances.GetParameterGroup(ctx, parameterGroupName)
	if err != nil {
		panic(err)
	}
	if parameterGroup == nil {
		log.Printf("Getting available database engine versions for %v.\n", dbEngine)
		engineVersions, err := scenario.instances.GetEngineVersions(ctx, dbEngine, "")
		if err != nil {
			panic(err)
		}

		familySet := map[string]struct{}{}
		for _, family := range engineVersions {
			familySet[*family.DBParameterGroupFamily] = struct{}{}
		}
		var families []string
		for family := range familySet {
			families = append(families, family)
		}
		sort.Strings(families)
		familyIndex := scenario.questioner.AskChoice("Which family do you want to use?\n", families)
		log.Println("Creating a DB parameter group.")
		_, err = scenario.instances.CreateParameterGroup(
			ctx, parameterGroupName, families[familyIndex], "Example parameter group.")
		if err != nil {
			panic(err)
		}
		parameterGroup, err = scenario.instances.GetParameterGroup(ctx, parameterGroupName)
		if err != nil {
			panic(err)
		}
	}
	log.Printf("Parameter group %v:\n", *parameterGroup.DBParameterGroupFamily)
	log.Printf("\tName: %v\n", *parameterGroup.DBParameterGroupName)
	log.Printf("\tARN: %v\n", *parameterGroup.DBParameterGroupArn)
	log.Printf("\tFamily: %v\n", *parameterGroup.DBParameterGroupFamily)
	log.Printf("\tDescription: %v\n", *parameterGroup.Description)
	log.Println(strings.Repeat("-", 88))
	return parameterGroup
}

// SetUserParameters shows how to get the parameters contained in a custom parameter
// group and update some of the parameter values in the group.
func (scenario GetStartedInstances) SetUserParameters(ctx context.Context, parameterGroupName string) {
	log.Println("Let's set some parameter values in your parameter group.")
	dbParameters, err := scenario.instances.GetParameters(ctx, parameterGroupName, "")
	if err != nil {
		panic(err)
	}
	var updateParams []types.Parameter
	for _, dbParam := range dbParameters {
		if strings.HasPrefix(*dbParam.ParameterName, "auto_increment") &&
			*dbParam.IsModifiable && *dbParam.DataType == "integer" {
			log.Printf("The %v parameter is described as:\n\t%v",
				*dbParam.ParameterName, *dbParam.Description)
			rangeSplit := strings.Split(*dbParam.AllowedValues, "-")
			lower, _ := strconv.Atoi(rangeSplit[0])
			upper, _ := strconv.Atoi(rangeSplit[1])
			newValue := scenario.questioner.AskInt(
				fmt.Sprintf("Enter a value between %v and %v:", lower, upper),
				demotools.InIntRange{Lower: lower, Upper: upper})
			dbParam.ParameterValue = aws.String(strconv.Itoa(newValue))
			updateParams = append(updateParams, dbParam)
		}
	}
	err = scenario.instances.UpdateParameters(ctx, parameterGroupName, updateParams)
	if err != nil {
		panic(err)
	}
	log.Println("To get a list of parameters that you set previously, specify a source of 'user'.")
	userParameters, err := scenario.instances.GetParameters(ctx, parameterGroupName, "user")
	if err != nil {
		panic(err)
	}
	log.Println("Here are the parameters you set:")
	for _, param := range userParameters {
		log.Printf("\t%v: %v\n", *param.ParameterName, *param.ParameterValue)
	}
	log.Println(strings.Repeat("-", 88))
}

// CreateInstance shows how to create a DB instance that contains a database of a
// specified type. The database is also configured to use a custom DB parameter group.
func (scenario GetStartedInstances) CreateInstance(ctx context.Context, instanceName string, dbEngine string,
	dbName string, parameterGroup *types.DBParameterGroup) *types.DBInstance {

	log.Println("Checking for an existing DB instance.")
	instance, err := scenario.instances.GetInstance(ctx, instanceName)
	if err != nil {
		panic(err)
	}
	if instance == nil {
		adminUsername := scenario.questioner.Ask(
			"Enter an administrator username for the database: ", demotools.NotEmpty{})
		adminPassword := scenario.questioner.AskPassword(
			"Enter a password for the administrator (at least 8 characters): ", 7)
		engineVersions, err := scenario.instances.GetEngineVersions(ctx, dbEngine,
			*parameterGroup.DBParameterGroupFamily)
		if err != nil {
			panic(err)
		}
		var engineChoices []string
		for _, engine := range engineVersions {
			engineChoices = append(engineChoices, *engine.EngineVersion)
		}
		engineIndex := scenario.questioner.AskChoice(
			"The available engines for your parameter group are:\n", engineChoices)
		engineSelection := engineVersions[engineIndex]
		instOpts, err := scenario.instances.GetOrderableInstances(ctx, *engineSelection.Engine,
			*engineSelection.EngineVersion)
		if err != nil {
			panic(err)
		}
		optSet := map[string]struct{}{}
		for _, opt := range instOpts {
			if strings.Contains(*opt.DBInstanceClass, "micro") {
				optSet[*opt.DBInstanceClass] = struct{}{}
			}
		}
		var optChoices []string
		for opt := range optSet {
			optChoices = append(optChoices, opt)
		}
		sort.Strings(optChoices)
		optIndex := scenario.questioner.AskChoice(
			"The available micro DB instance classes for your database engine are:\n", optChoices)
		storageType := "standard"
		allocatedStorage := int32(5)
		log.Printf("Creating a DB instance named %v and database %v.\n"+
			"The DB instance is configured to use your custom parameter group %v,\n"+
			"selected engine %v,\n"+
			"selected DB instance class %v,"+
			"and %v GiB of %v storage.\n"+
			"This typically takes several minutes.",
			instanceName, dbName, *parameterGroup.DBParameterGroupName, *engineSelection.EngineVersion,
			optChoices[optIndex], allocatedStorage, storageType)
		instance, err = scenario.instances.CreateInstance(
			ctx, instanceName, dbName, *engineSelection.Engine, *engineSelection.EngineVersion,
			*parameterGroup.DBParameterGroupName, optChoices[optIndex], storageType,
			allocatedStorage, adminUsername, adminPassword)
		if err != nil {
			panic(err)
		}
		for *instance.DBInstanceStatus != "available" {
			scenario.helper.Pause(30)
			instance, err = scenario.instances.GetInstance(ctx, instanceName)
			if err != nil {
				panic(err)
			}
		}
		log.Println("Instance created and available.")
	}
	log.Println("Instance data:")
	log.Printf("\tDBInstanceIdentifier: %v\n", *instance.DBInstanceIdentifier)
	log.Printf("\tARN: %v\n", *instance.DBInstanceArn)
	log.Printf("\tStatus: %v\n", *instance.DBInstanceStatus)
	log.Printf("\tEngine: %v\n", *instance.Engine)
	log.Printf("\tEngine version: %v\n", *instance.EngineVersion)
	log.Println(strings.Repeat("-", 88))
	return instance
}

// DisplayConnection displays connection information about a DB instance and tips
// on how to connect to it.
func (scenario GetStartedInstances) DisplayConnection(instance *types.DBInstance) {
	log.Println(
		"You can now connect to your database by using your favorite MySQL client.\n" +
			"One way to connect is by using the 'mysql' shell on an Amazon EC2 instance\n" +
			"that is running in the same VPC as your DB instance. Pass the endpoint,\n" +
			"port, and administrator username to 'mysql'. Then, enter your password\n" +
			"when prompted:")
	log.Printf("\n\tmysql -h %v -P %v -u %v -p\n",
		*instance.Endpoint.Address, instance.Endpoint.Port, *instance.MasterUsername)
	log.Println("For more information, see the User Guide for RDS:\n" +
		"\thttps://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_GettingStarted.CreatingConnecting.MySQL.html#CHAP_GettingStarted.Connecting.MySQL")
	log.Println(strings.Repeat("-", 88))
}

// CreateSnapshot shows how to create a DB instance snapshot and wait until it's available.
func (scenario GetStartedInstances) CreateSnapshot(ctx context.Context, instance *types.DBInstance) {
	if scenario.questioner.AskBool(
		"Do you want to create a snapshot of your DB instance (y/n)? ", "y") {
		snapshotId := fmt.Sprintf("%v-%v", *instance.DBInstanceIdentifier, scenario.helper.UniqueId())
		log.Printf("Creating a snapshot named %v. This typically takes a few minutes.\n", snapshotId)
		snapshot, err := scenario.instances.CreateSnapshot(ctx, *instance.DBInstanceIdentifier, snapshotId)
		if err != nil {
			panic(err)
		}
		for *snapshot.Status != "available" {
			scenario.helper.Pause(30)
			snapshot, err = scenario.instances.GetSnapshot(ctx, snapshotId)
			if err != nil {
				panic(err)
			}
		}
		log.Println("Snapshot data:")
		log.Printf("\tDBSnapshotIdentifier: %v\n", *snapshot.DBSnapshotIdentifier)
		log.Printf("\tARN: %v\n", *snapshot.DBSnapshotArn)
		log.Printf("\tStatus: %v\n", *snapshot.Status)
		log.Printf("\tEngine: %v\n", *snapshot.Engine)
		log.Printf("\tEngine version: %v\n", *snapshot.EngineVersion)
		log.Printf("\tDBInstanceIdentifier: %v\n", *snapshot.DBInstanceIdentifier)
		log.Printf("\tSnapshotCreateTime: %v\n", *snapshot.SnapshotCreateTime)
		log.Println(strings.Repeat("-", 88))
	}
}

// Cleanup shows how to clean up a DB instance and DB parameter group.
// Before the DB parameter group can be deleted, all associated DB instances must first be deleted.
func (scenario GetStartedInstances) Cleanup(
	ctx context.Context, instance *types.DBInstance, parameterGroup *types.DBParameterGroup) {

	if scenario.questioner.AskBool(
		"\nDo you want to delete the database instance and parameter group (y/n)? ", "y") {
		log.Printf("Deleting database instance %v.\n", *instance.DBInstanceIdentifier)
		err := scenario.instances.DeleteInstance(ctx, *instance.DBInstanceIdentifier)
		if err != nil {
			panic(err)
		}
		log.Println(
			"Waiting for the DB instance to delete. This typically takes several minutes.")
		for instance != nil {
			scenario.helper.Pause(30)
			instance, err = scenario.instances.GetInstance(ctx, *instance.DBInstanceIdentifier)
			if err != nil {
				panic(err)
			}
		}
		log.Printf("Deleting parameter group %v.", *parameterGroup.DBParameterGroupName)
		err = scenario.instances.DeleteParameterGroup(ctx, *parameterGroup.DBParameterGroupName)
		if err != nil {
			panic(err)
		}
	}
}

// IScenarioHelper abstracts the function from a scenario so that it
// can be mocked for unit testing.
type IScenarioHelper interface {
	Pause(secs int)
	UniqueId() string
}
type ScenarioHelper struct{}

// Pause waits for the specified number of seconds.
func (helper ScenarioHelper) Pause(secs int) {
	time.Sleep(time.Duration(secs) * time.Second)
}

// UniqueId returns a new UUID.
func (helper ScenarioHelper) UniqueId() string {
	return uuid.New().String()
}
```
Amazon RDS 작업을 관리하기 위해 시나리오에서 호출하는 함수를 정의합니다.  

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}


// GetParameterGroup gets a DB parameter group by name.
func (instances *DbInstances) GetParameterGroup(ctx context.Context, parameterGroupName string) (
	*types.DBParameterGroup, error) {
	output, err := instances.RdsClient.DescribeDBParameterGroups(
		ctx, &rds.DescribeDBParameterGroupsInput{
			DBParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		var notFoundError *types.DBParameterGroupNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("Parameter group %v does not exist.\n", parameterGroupName)
			err = nil
		} else {
			log.Printf("Error getting parameter group %v: %v\n", parameterGroupName, err)
		}
		return nil, err
	} else {
		return &output.DBParameterGroups[0], err
	}
}



// CreateParameterGroup creates a DB parameter group that is based on the specified
// parameter group family.
func (instances *DbInstances) CreateParameterGroup(
	ctx context.Context, parameterGroupName string, parameterGroupFamily string, description string) (
	*types.DBParameterGroup, error) {

	output, err := instances.RdsClient.CreateDBParameterGroup(ctx,
		&rds.CreateDBParameterGroupInput{
			DBParameterGroupName:   aws.String(parameterGroupName),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
			Description:            aws.String(description),
		})
	if err != nil {
		log.Printf("Couldn't create parameter group %v: %v\n", parameterGroupName, err)
		return nil, err
	} else {
		return output.DBParameterGroup, err
	}
}



// DeleteParameterGroup deletes the named DB parameter group.
func (instances *DbInstances) DeleteParameterGroup(ctx context.Context, parameterGroupName string) error {
	_, err := instances.RdsClient.DeleteDBParameterGroup(ctx,
		&rds.DeleteDBParameterGroupInput{
			DBParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		log.Printf("Couldn't delete parameter group %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}



// GetParameters gets the parameters that are contained in a DB parameter group.
func (instances *DbInstances) GetParameters(ctx context.Context, parameterGroupName string, source string) (
	[]types.Parameter, error) {

	var output *rds.DescribeDBParametersOutput
	var params []types.Parameter
	var err error
	parameterPaginator := rds.NewDescribeDBParametersPaginator(instances.RdsClient,
		&rds.DescribeDBParametersInput{
			DBParameterGroupName: aws.String(parameterGroupName),
			Source:               aws.String(source),
		})
	for parameterPaginator.HasMorePages() {
		output, err = parameterPaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get parameters for %v: %v\n", parameterGroupName, err)
			break
		} else {
			params = append(params, output.Parameters...)
		}
	}
	return params, err
}



// UpdateParameters updates parameters in a named DB parameter group.
func (instances *DbInstances) UpdateParameters(ctx context.Context, parameterGroupName string, params []types.Parameter) error {
	_, err := instances.RdsClient.ModifyDBParameterGroup(ctx,
		&rds.ModifyDBParameterGroupInput{
			DBParameterGroupName: aws.String(parameterGroupName),
			Parameters:           params,
		})
	if err != nil {
		log.Printf("Couldn't update parameters in %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}



// CreateSnapshot creates a snapshot of a DB instance.
func (instances *DbInstances) CreateSnapshot(ctx context.Context, instanceName string, snapshotName string) (
	*types.DBSnapshot, error) {
	output, err := instances.RdsClient.CreateDBSnapshot(ctx, &rds.CreateDBSnapshotInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBSnapshotIdentifier: aws.String(snapshotName),
	})
	if err != nil {
		log.Printf("Couldn't create snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return output.DBSnapshot, nil
	}
}



// GetSnapshot gets a DB instance snapshot.
func (instances *DbInstances) GetSnapshot(ctx context.Context, snapshotName string) (*types.DBSnapshot, error) {
	output, err := instances.RdsClient.DescribeDBSnapshots(ctx,
		&rds.DescribeDBSnapshotsInput{
			DBSnapshotIdentifier: aws.String(snapshotName),
		})
	if err != nil {
		log.Printf("Couldn't get snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return &output.DBSnapshots[0], nil
	}
}



// CreateInstance creates a DB instance.
func (instances *DbInstances) CreateInstance(ctx context.Context, instanceName string, dbName string,
	dbEngine string, dbEngineVersion string, parameterGroupName string, dbInstanceClass string,
	storageType string, allocatedStorage int32, adminName string, adminPassword string) (
	*types.DBInstance, error) {
	output, err := instances.RdsClient.CreateDBInstance(ctx, &rds.CreateDBInstanceInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBName:               aws.String(dbName),
		DBParameterGroupName: aws.String(parameterGroupName),
		Engine:               aws.String(dbEngine),
		EngineVersion:        aws.String(dbEngineVersion),
		DBInstanceClass:      aws.String(dbInstanceClass),
		StorageType:          aws.String(storageType),
		AllocatedStorage:     aws.Int32(allocatedStorage),
		MasterUsername:       aws.String(adminName),
		MasterUserPassword:   aws.String(adminPassword),
	})
	if err != nil {
		log.Printf("Couldn't create instance %v: %v\n", instanceName, err)
		return nil, err
	} else {
		return output.DBInstance, nil
	}
}



// GetInstance gets data about a DB instance.
func (instances *DbInstances) GetInstance(ctx context.Context, instanceName string) (
	*types.DBInstance, error) {
	output, err := instances.RdsClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{
			DBInstanceIdentifier: aws.String(instanceName),
		})
	if err != nil {
		var notFoundError *types.DBInstanceNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB instance %v does not exist.\n", instanceName)
			err = nil
		} else {
			log.Printf("Couldn't get instance %v: %v\n", instanceName, err)
		}
		return nil, err
	} else {
		return &output.DBInstances[0], nil
	}
}



// DeleteInstance deletes a DB instance.
func (instances *DbInstances) DeleteInstance(ctx context.Context, instanceName string) error {
	_, err := instances.RdsClient.DeleteDBInstance(ctx, &rds.DeleteDBInstanceInput{
		DBInstanceIdentifier:   aws.String(instanceName),
		SkipFinalSnapshot:      aws.Bool(true),
		DeleteAutomatedBackups: aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete instance %v: %v\n", instanceName, err)
		return err
	} else {
		return nil
	}
}



// GetEngineVersions gets database engine versions that are available for the specified engine
// and parameter group family.
func (instances *DbInstances) GetEngineVersions(ctx context.Context, engine string, parameterGroupFamily string) (
	[]types.DBEngineVersion, error) {
	output, err := instances.RdsClient.DescribeDBEngineVersions(ctx,
		&rds.DescribeDBEngineVersionsInput{
			Engine:                 aws.String(engine),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
		})
	if err != nil {
		log.Printf("Couldn't get engine versions for %v: %v\n", engine, err)
		return nil, err
	} else {
		return output.DBEngineVersions, nil
	}
}



// GetOrderableInstances uses a paginator to get DB instance options that can be used to create DB instances that are
// compatible with a set of specifications.
func (instances *DbInstances) GetOrderableInstances(ctx context.Context, engine string, engineVersion string) (
	[]types.OrderableDBInstanceOption, error) {

	var output *rds.DescribeOrderableDBInstanceOptionsOutput
	var instanceOptions []types.OrderableDBInstanceOption
	var err error
	orderablePaginator := rds.NewDescribeOrderableDBInstanceOptionsPaginator(instances.RdsClient,
		&rds.DescribeOrderableDBInstanceOptionsInput{
			Engine:        aws.String(engine),
			EngineVersion: aws.String(engineVersion),
		})
	for orderablePaginator.HasMorePages() {
		output, err = orderablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get orderable DB instance options: %v\n", err)
			break
		} else {
			instanceOptions = append(instanceOptions, output.OrderableDBInstanceOptions...)
		}
	}
	return instanceOptions, err
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [CreateDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBInstance)
  + [CreateDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBParameterGroup)
  + [CreateDBSnapshot](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBSnapshot)
  + [DeleteDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBInstance)
  + [DeleteDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBParameterGroup)
  + [DescribeDBEngineVersions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBEngineVersions)
  + [DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)
  + [DescribeDBParameterGroups](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBParameterGroups)
  + [DescribeDBParameters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBParameters)
  + [DescribeDBSnapshots](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBSnapshots)
  + [DescribeOrderableDBInstanceOptions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeOrderableDBInstanceOptions)
  + [ModifyDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.ModifyDBParameterGroup)

## 작업
<a name="actions"></a>

### `CreateDBInstance`
<a name="rds_CreateDBInstance_go_2_topic"></a>

다음 코드 예시는 `CreateDBInstance`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// CreateInstance creates a DB instance.
func (instances *DbInstances) CreateInstance(ctx context.Context, instanceName string, dbName string,
	dbEngine string, dbEngineVersion string, parameterGroupName string, dbInstanceClass string,
	storageType string, allocatedStorage int32, adminName string, adminPassword string) (
	*types.DBInstance, error) {
	output, err := instances.RdsClient.CreateDBInstance(ctx, &rds.CreateDBInstanceInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBName:               aws.String(dbName),
		DBParameterGroupName: aws.String(parameterGroupName),
		Engine:               aws.String(dbEngine),
		EngineVersion:        aws.String(dbEngineVersion),
		DBInstanceClass:      aws.String(dbInstanceClass),
		StorageType:          aws.String(storageType),
		AllocatedStorage:     aws.Int32(allocatedStorage),
		MasterUsername:       aws.String(adminName),
		MasterUserPassword:   aws.String(adminPassword),
	})
	if err != nil {
		log.Printf("Couldn't create instance %v: %v\n", instanceName, err)
		return nil, err
	} else {
		return output.DBInstance, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBInstance)를 참조하세요.

### `CreateDBParameterGroup`
<a name="rds_CreateDBParameterGroup_go_2_topic"></a>

다음 코드 예시는 `CreateDBParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// CreateParameterGroup creates a DB parameter group that is based on the specified
// parameter group family.
func (instances *DbInstances) CreateParameterGroup(
	ctx context.Context, parameterGroupName string, parameterGroupFamily string, description string) (
	*types.DBParameterGroup, error) {

	output, err := instances.RdsClient.CreateDBParameterGroup(ctx,
		&rds.CreateDBParameterGroupInput{
			DBParameterGroupName:   aws.String(parameterGroupName),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
			Description:            aws.String(description),
		})
	if err != nil {
		log.Printf("Couldn't create parameter group %v: %v\n", parameterGroupName, err)
		return nil, err
	} else {
		return output.DBParameterGroup, err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBParameterGroup)을 참조하세요.

### `CreateDBSnapshot`
<a name="rds_CreateDBSnapshot_go_2_topic"></a>

다음 코드 예시는 `CreateDBSnapshot`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// CreateSnapshot creates a snapshot of a DB instance.
func (instances *DbInstances) CreateSnapshot(ctx context.Context, instanceName string, snapshotName string) (
	*types.DBSnapshot, error) {
	output, err := instances.RdsClient.CreateDBSnapshot(ctx, &rds.CreateDBSnapshotInput{
		DBInstanceIdentifier: aws.String(instanceName),
		DBSnapshotIdentifier: aws.String(snapshotName),
	})
	if err != nil {
		log.Printf("Couldn't create snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return output.DBSnapshot, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateDBSnapshot](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.CreateDBSnapshot)을 참조하세요.

### `DeleteDBInstance`
<a name="rds_DeleteDBInstance_go_2_topic"></a>

다음 코드 예시는 `DeleteDBInstance`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// DeleteInstance deletes a DB instance.
func (instances *DbInstances) DeleteInstance(ctx context.Context, instanceName string) error {
	_, err := instances.RdsClient.DeleteDBInstance(ctx, &rds.DeleteDBInstanceInput{
		DBInstanceIdentifier:   aws.String(instanceName),
		SkipFinalSnapshot:      aws.Bool(true),
		DeleteAutomatedBackups: aws.Bool(true),
	})
	if err != nil {
		log.Printf("Couldn't delete instance %v: %v\n", instanceName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteDBInstance](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBInstance)를 참조하세요.

### `DeleteDBParameterGroup`
<a name="rds_DeleteDBParameterGroup_go_2_topic"></a>

다음 코드 예시는 `DeleteDBParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// DeleteParameterGroup deletes the named DB parameter group.
func (instances *DbInstances) DeleteParameterGroup(ctx context.Context, parameterGroupName string) error {
	_, err := instances.RdsClient.DeleteDBParameterGroup(ctx,
		&rds.DeleteDBParameterGroupInput{
			DBParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		log.Printf("Couldn't delete parameter group %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DeleteDBParameterGroup)을 참조하세요.

### `DescribeDBEngineVersions`
<a name="rds_DescribeDBEngineVersions_go_2_topic"></a>

다음 코드 예시는 `DescribeDBEngineVersions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetEngineVersions gets database engine versions that are available for the specified engine
// and parameter group family.
func (instances *DbInstances) GetEngineVersions(ctx context.Context, engine string, parameterGroupFamily string) (
	[]types.DBEngineVersion, error) {
	output, err := instances.RdsClient.DescribeDBEngineVersions(ctx,
		&rds.DescribeDBEngineVersionsInput{
			Engine:                 aws.String(engine),
			DBParameterGroupFamily: aws.String(parameterGroupFamily),
		})
	if err != nil {
		log.Printf("Couldn't get engine versions for %v: %v\n", engine, err)
		return nil, err
	} else {
		return output.DBEngineVersions, nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBEngineVersions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBEngineVersions)을 참조하세요.

### `DescribeDBInstances`
<a name="rds_DescribeDBInstances_go_2_topic"></a>

다음 코드 예시는 `DescribeDBInstances`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetInstance gets data about a DB instance.
func (instances *DbInstances) GetInstance(ctx context.Context, instanceName string) (
	*types.DBInstance, error) {
	output, err := instances.RdsClient.DescribeDBInstances(ctx,
		&rds.DescribeDBInstancesInput{
			DBInstanceIdentifier: aws.String(instanceName),
		})
	if err != nil {
		var notFoundError *types.DBInstanceNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("DB instance %v does not exist.\n", instanceName)
			err = nil
		} else {
			log.Printf("Couldn't get instance %v: %v\n", instanceName, err)
		}
		return nil, err
	} else {
		return &output.DBInstances[0], nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBInstances](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBInstances)를 참조하세요.

### `DescribeDBParameterGroups`
<a name="rds_DescribeDBParameterGroups_go_2_topic"></a>

다음 코드 예시는 `DescribeDBParameterGroups`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetParameterGroup gets a DB parameter group by name.
func (instances *DbInstances) GetParameterGroup(ctx context.Context, parameterGroupName string) (
	*types.DBParameterGroup, error) {
	output, err := instances.RdsClient.DescribeDBParameterGroups(
		ctx, &rds.DescribeDBParameterGroupsInput{
			DBParameterGroupName: aws.String(parameterGroupName),
		})
	if err != nil {
		var notFoundError *types.DBParameterGroupNotFoundFault
		if errors.As(err, &notFoundError) {
			log.Printf("Parameter group %v does not exist.\n", parameterGroupName)
			err = nil
		} else {
			log.Printf("Error getting parameter group %v: %v\n", parameterGroupName, err)
		}
		return nil, err
	} else {
		return &output.DBParameterGroups[0], err
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBParameterGroups](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBParameterGroups)를 참조하세요.

### `DescribeDBParameters`
<a name="rds_DescribeDBParameters_go_2_topic"></a>

다음 코드 예시는 `DescribeDBParameters`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetParameters gets the parameters that are contained in a DB parameter group.
func (instances *DbInstances) GetParameters(ctx context.Context, parameterGroupName string, source string) (
	[]types.Parameter, error) {

	var output *rds.DescribeDBParametersOutput
	var params []types.Parameter
	var err error
	parameterPaginator := rds.NewDescribeDBParametersPaginator(instances.RdsClient,
		&rds.DescribeDBParametersInput{
			DBParameterGroupName: aws.String(parameterGroupName),
			Source:               aws.String(source),
		})
	for parameterPaginator.HasMorePages() {
		output, err = parameterPaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get parameters for %v: %v\n", parameterGroupName, err)
			break
		} else {
			params = append(params, output.Parameters...)
		}
	}
	return params, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBParameters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBParameters) 참조하세요.

### `DescribeDBSnapshots`
<a name="rds_DescribeDBSnapshots_go_2_topic"></a>

다음 코드 예시는 `DescribeDBSnapshots`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetSnapshot gets a DB instance snapshot.
func (instances *DbInstances) GetSnapshot(ctx context.Context, snapshotName string) (*types.DBSnapshot, error) {
	output, err := instances.RdsClient.DescribeDBSnapshots(ctx,
		&rds.DescribeDBSnapshotsInput{
			DBSnapshotIdentifier: aws.String(snapshotName),
		})
	if err != nil {
		log.Printf("Couldn't get snapshot %v: %v\n", snapshotName, err)
		return nil, err
	} else {
		return &output.DBSnapshots[0], nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeDBSnapshots](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeDBSnapshots)를 참조하세요.

### `DescribeOrderableDBInstanceOptions`
<a name="rds_DescribeOrderableDBInstanceOptions_go_2_topic"></a>

다음 코드 예시는 `DescribeOrderableDBInstanceOptions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// GetOrderableInstances uses a paginator to get DB instance options that can be used to create DB instances that are
// compatible with a set of specifications.
func (instances *DbInstances) GetOrderableInstances(ctx context.Context, engine string, engineVersion string) (
	[]types.OrderableDBInstanceOption, error) {

	var output *rds.DescribeOrderableDBInstanceOptionsOutput
	var instanceOptions []types.OrderableDBInstanceOption
	var err error
	orderablePaginator := rds.NewDescribeOrderableDBInstanceOptionsPaginator(instances.RdsClient,
		&rds.DescribeOrderableDBInstanceOptionsInput{
			Engine:        aws.String(engine),
			EngineVersion: aws.String(engineVersion),
		})
	for orderablePaginator.HasMorePages() {
		output, err = orderablePaginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get orderable DB instance options: %v\n", err)
			break
		} else {
			instanceOptions = append(instanceOptions, output.OrderableDBInstanceOptions...)
		}
	}
	return instanceOptions, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeOrderableDBInstanceOptions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.DescribeOrderableDBInstanceOptions)를 참조하세요.

### `ModifyDBParameterGroup`
<a name="rds_ModifyDBParameterGroup_go_2_topic"></a>

다음 코드 예시는 `ModifyDBParameterGroup`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/rds#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/rds"
	"github.com/aws/aws-sdk-go-v2/service/rds/types"
)

type DbInstances struct {
	RdsClient *rds.Client
}



// UpdateParameters updates parameters in a named DB parameter group.
func (instances *DbInstances) UpdateParameters(ctx context.Context, parameterGroupName string, params []types.Parameter) error {
	_, err := instances.RdsClient.ModifyDBParameterGroup(ctx,
		&rds.ModifyDBParameterGroupInput{
			DBParameterGroupName: aws.String(parameterGroupName),
			Parameters:           params,
		})
	if err != nil {
		log.Printf("Couldn't update parameters in %v: %v\n", parameterGroupName, err)
		return err
	} else {
		return nil
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ModifyDBParameterGroup](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/rds#Client.ModifyDBParameterGroup)을 참조하세요.

## 서버리스 예제
<a name="serverless_examples"></a>

### Lambda 함수를 사용하여 Amazon RDS 데이터베이스에 연결
<a name="serverless_connect_RDS_Lambda_go_2_topic"></a>

다음 코드 예제는 RDS 데이터베이스에 연결하는 Lambda 함수를 구현하는 방법을 보여줍니다. 이 함수는 간단한 데이터베이스 요청을 하고 결과를 반환합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-connect-rds-iam) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda 함수에서 Amazon RDS 데이터베이스에 연결  

```
/*
Golang v2 code here.
*/

package main

import (
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"os"

	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/feature/rds/auth"
	_ "github.com/go-sql-driver/mysql"
)

type MyEvent struct {
	Name string `json:"name"`
}

func HandleRequest(event *MyEvent) (map[string]interface{}, error) {

	var dbName string = os.Getenv("DatabaseName")
	var dbUser string = os.Getenv("DatabaseUser")
	var dbHost string = os.Getenv("DBHost") // Add hostname without https
	var dbPort int = os.Getenv("Port")      // Add port number
	var dbEndpoint string = fmt.Sprintf("%s:%d", dbHost, dbPort)
	var region string = os.Getenv("AWS_REGION")

	cfg, err := config.LoadDefaultConfig(context.TODO())
	if err != nil {
		panic("configuration error: " + err.Error())
	}

	authenticationToken, err := auth.BuildAuthToken(
		context.TODO(), dbEndpoint, region, dbUser, cfg.Credentials)
	if err != nil {
		panic("failed to create authentication token: " + err.Error())
	}

	dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s?tls=true&allowCleartextPasswords=true",
		dbUser, authenticationToken, dbEndpoint, dbName,
	)

	db, err := sql.Open("mysql", dsn)
	if err != nil {
		panic(err)
	}

	defer db.Close()

	var sum int
	err = db.QueryRow("SELECT ?+? AS sum", 3, 2).Scan(&sum)
	if err != nil {
		panic(err)
	}
	s := fmt.Sprint(sum)
	message := fmt.Sprintf("The selected sum is: %s", s)

	messageBytes, err := json.Marshal(message)
	if err != nil {
		return nil, err
	}

	messageString := string(messageBytes)
	return map[string]interface{}{
		"statusCode": 200,
		"headers":    map[string]string{"Content-Type": "application/json"},
		"body":       messageString,
	}, nil
}

func main() {
	lambda.Start(HandleRequest)
}
```

# SDK for Go V2를 사용한 Amazon Redshift 예제
<a name="go_2_redshift_code_examples"></a>

다음 코드 예제에서는 Amazon Redshift에서 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접적으로 호출하는 방법을 보여주며 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)

## 시작하기
<a name="get_started"></a>

### Hello Amazon Redshift
<a name="redshift_Hello_go_2_topic"></a>

다음 코드 예시에서는 Amazon Redshift 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
)

// main uses the AWS SDK for Go V2 to create a Redshift client
// and list up to 10 clusters in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	redshiftClient := redshift.NewFromConfig(sdkConfig)
	count := 20
	fmt.Printf("Let's list up to %v clusters for your account.\n", count)
	result, err := redshiftClient.DescribeClusters(ctx, &redshift.DescribeClustersInput{
		MaxRecords: aws.Int32(int32(count)),
	})
	if err != nil {
		fmt.Printf("Couldn't list clusters for your account. Here's why: %v\n", err)
		return
	}
	if len(result.Clusters) == 0 {
		fmt.Println("You don't have any clusters!")
		return
	}
	for _, cluster := range result.Clusters {
		fmt.Printf("\t%v : %v\n", *cluster.ClusterIdentifier, *cluster.ClusterStatus)
	}
}
```
+  API에 대한 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.DescribeClusters)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="redshift_Scenario_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ Redshift 클러스터를 생성합니다.
+ 클러스터의 데이터베이스를 나열합니다.
+ Movies라는 테이블을 생성합니다.
+ Movies 테이블을 채웁니다.
+ Movies 테이블을 연도별로 쿼리합니다.
+ Redshift 클러스터를 수정합니다.
+ Amazon Redshift 클러스터를 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예제 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예제를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package scenarios

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"math/rand"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	redshift_types "github.com/aws/aws-sdk-go-v2/service/redshift/types"
	redshiftdata_types "github.com/aws/aws-sdk-go-v2/service/redshiftdata/types"
	"github.com/aws/aws-sdk-go-v2/service/secretsmanager"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/redshift/actions"

	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshiftdata"
)

// IScenarioHelper abstracts input and wait functions from a scenario so that they
// can be mocked for unit testing.
type IScenarioHelper interface {
	GetName() string
}

const rMax = 100000

type ScenarioHelper struct {
	Prefix string
	Random *rand.Rand
}

// GetName returns a unique name formed of a prefix and a random number.
func (helper ScenarioHelper) GetName() string {
	return fmt.Sprintf("%v%v", helper.Prefix, helper.Random.Intn(rMax))
}

// RedshiftBasicsScenario separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type RedshiftBasicsScenario struct {
	sdkConfig         aws.Config
	helper            IScenarioHelper
	questioner        demotools.IQuestioner
	pauser            demotools.IPausable
	filesystem        demotools.IFileSystem
	redshiftActor     *actions.RedshiftActions
	redshiftDataActor *actions.RedshiftDataActions
	secretsmanager    *SecretsManager
}

// SecretsManager is used to retrieve username and password information from a secure service.
type SecretsManager struct {
	SecretsManagerClient *secretsmanager.Client
}

// RedshiftBasics constructs a new Redshift Basics runner.
func RedshiftBasics(sdkConfig aws.Config, questioner demotools.IQuestioner, pauser demotools.IPausable, filesystem demotools.IFileSystem, helper IScenarioHelper) RedshiftBasicsScenario {
	scenario := RedshiftBasicsScenario{
		sdkConfig:         sdkConfig,
		helper:            helper,
		questioner:        questioner,
		pauser:            pauser,
		filesystem:        filesystem,
		secretsmanager:    &SecretsManager{SecretsManagerClient: secretsmanager.NewFromConfig(sdkConfig)},
		redshiftActor:     &actions.RedshiftActions{RedshiftClient: redshift.NewFromConfig(sdkConfig)},
		redshiftDataActor: &actions.RedshiftDataActions{RedshiftDataClient: redshiftdata.NewFromConfig(sdkConfig)},
	}
	return scenario
}


// Movie makes it easier to use Movie objects given in json format.
type Movie struct {
	ID    int    `json:"id"`
	Title string `json:"title"`
	Year  int    `json:"year"`
}


// User makes it easier to get the User data back from SecretsManager and use it later.
type User struct {
	Username string `json:"userName"`
	Password string `json:"userPassword"`
}

// Run runs the RedshiftBasics interactive example that shows you how to use Amazon
// Redshift and how to interact with its common endpoints.
//
// 0. Retrieve username and password information to access Redshift.
// 1. Create a cluster.
// 2. Wait for the cluster to become available.
// 3. List the available databases in the region.
// 4. Create a table named "Movies" in the "dev" database.
// 5. Populate the movies table from the "movies.json" file.
// 6. Query the movies table by year.
// 7. Modify the cluster's maintenance window.
// 8. Optionally clean up all resources created during this demo.
//
// This example creates an Amazon Redshift service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
func (runner *RedshiftBasicsScenario) Run(ctx context.Context) {

	user := User{}
	secretId := "s3express/basics/secrets"
	clusterId := "demo-cluster-1"
	maintenanceWindow := "wed:07:30-wed:08:00"
	databaseName := "dev"
	tableName := "Movies"
	fileName := "Movies.json"
	nodeType := "ra3.xlplus"
	clusterType := "single-node"

	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			_, isMock := runner.questioner.(*demotools.MockQuestioner)
			if isMock || runner.questioner.AskBool("Do you want to see the full error message (y/n)?", "y") {
				log.Println(r)
			}
			runner.cleanUpResources(ctx, clusterId, databaseName, tableName, user.Username, runner.questioner)
		}
	}()

	// Retrieve the userName and userPassword from SecretsManager
	output, err := runner.secretsmanager.SecretsManagerClient.GetSecretValue(ctx, &secretsmanager.GetSecretValueInput{
		SecretId: aws.String(secretId),
	})
	if err != nil {
		log.Printf("There was a problem getting the secret value: %s", err)
		log.Printf("Please make sure to create a secret named 's3express/basics/secrets' with keys of 'userName' and 'userPassword'.")
		panic(err)
	}

	err = json.Unmarshal([]byte(*output.SecretString), &user)
	if err != nil {
		log.Printf("There was a problem parsing the secret value from JSON: %s", err)
		panic(err)
	}

	// Create the Redshift cluster
	_, err = runner.redshiftActor.CreateCluster(ctx, clusterId, user.Username, user.Password, nodeType, clusterType, true)
	if err != nil {
		var clusterAlreadyExistsFault *redshift_types.ClusterAlreadyExistsFault
		if errors.As(err, &clusterAlreadyExistsFault) {
			log.Println("Cluster already exists. Continuing.")
		} else {
			log.Println("Error creating cluster.")
			panic(err)
		}
	}

	// Wait for the cluster to become available
	waiter := redshift.NewClusterAvailableWaiter(runner.redshiftActor.RedshiftClient)
	err = waiter.Wait(ctx, &redshift.DescribeClustersInput{
		ClusterIdentifier: aws.String(clusterId),
	}, 5*time.Minute)
	if err != nil {
		log.Println("An error occurred waiting for the cluster.")
		panic(err)
	}

	// Get some info about the cluster
	describeOutput, err := runner.redshiftActor.DescribeClusters(ctx, clusterId)
	if err != nil {
		log.Println("Something went wrong trying to get information about the cluster.")
		panic(err)
	}
	log.Println("Here's some information about the cluster.")
	log.Printf("The cluster's status is %s", *describeOutput.Clusters[0].ClusterStatus)
	log.Printf("The cluster was created at %s", *describeOutput.Clusters[0].ClusterCreateTime)

	// List databases
	log.Println("List databases in", clusterId)
	runner.questioner.Ask("Press Enter to continue...")
	err = runner.redshiftDataActor.ListDatabases(ctx, clusterId, databaseName, user.Username)
	if err != nil {
		log.Printf("Failed to list databases: %v\n", err)
		panic(err)
	}

	// Create the "Movies" table
	log.Println("Now you will create a table named " + tableName + ".")
	runner.questioner.Ask("Press Enter to continue...")
	err = nil
	result, err := runner.redshiftDataActor.CreateTable(ctx, clusterId, databaseName, tableName, user.Username, runner.pauser, []string{"title VARCHAR(256)", "year INT"})
	if err != nil {
		log.Printf("Failed to create table: %v\n", err)
		panic(err)
	}

	describeInput := redshiftdata.DescribeStatementInput{
		Id: result.Id,
	}
	query := actions.RedshiftQuery{
		Context: ctx,
		Input:   describeInput,
		Result:  result,
	}
	err = runner.redshiftDataActor.WaitForQueryStatus(query, runner.pauser, true)
	if err != nil {
		log.Printf("Failed to execute query: %v\n", err)
		panic(err)
	}
	log.Printf("Successfully executed query\n")

	// Populate the "Movies" table
	runner.PopulateMoviesTable(ctx, clusterId, databaseName, tableName, user.Username, fileName)

	// Query the "Movies" table by year
	log.Println("Query the Movies table by year.")
	year := runner.questioner.AskInt(
		fmt.Sprintf("Enter a value between %v and %v:", 2012, 2014),
		demotools.InIntRange{Lower: 2012, Upper: 2014})
	runner.QueryMoviesByYear(ctx, clusterId, databaseName, tableName, user.Username, year)

	// Modify the cluster's maintenance window
	runner.redshiftActor.ModifyCluster(ctx, clusterId, maintenanceWindow)

	// Delete the Redshift cluster if confirmed
	runner.cleanUpResources(ctx, clusterId, databaseName, tableName, user.Username, runner.questioner)

	log.Println("Thanks for watching!")
}

// cleanUpResources asks the user if they would like to delete each resource created during the scenario, from most
// impactful to least impactful. If any choice to delete is made, further deletion attempts are skipped.
func (runner *RedshiftBasicsScenario) cleanUpResources(ctx context.Context, clusterId string, databaseName string, tableName string, userName string, questioner demotools.IQuestioner) {
	deleted := false
	var err error = nil
	if questioner.AskBool("Do you want to delete the entire cluster? This will clean up all resources. (y/n)", "y") {
		deleted, err = runner.redshiftActor.DeleteCluster(ctx, clusterId)
		if err != nil {
			log.Printf("Error deleting cluster: %v", err)
		}
	}
	if !deleted && questioner.AskBool("Do you want to delete the dev table? This will clean up all inserted records but keep your cluster intact. (y/n)", "y") {
		deleted, err = runner.redshiftDataActor.DeleteTable(ctx, clusterId, databaseName, tableName, userName)
		if err != nil {
			log.Printf("Error deleting movies table: %v", err)
		}
	}
	if !deleted && questioner.AskBool("Do you want to delete all rows in the Movies table? This will clean up all inserted records but keep your cluster and table intact. (y/n)", "y") {
		deleted, err = runner.redshiftDataActor.DeleteDataRows(ctx, clusterId, databaseName, tableName, userName, runner.pauser)
		if err != nil {
			log.Printf("Error deleting data rows: %v", err)
		}
	}
	if !deleted {
		log.Print("Please manually delete any unwanted resources.")
	}
}


// loadMoviesFromJSON takes the <fileName> file and populates a slice of Movie objects.
func (runner *RedshiftBasicsScenario) loadMoviesFromJSON(fileName string, filesystem demotools.IFileSystem) ([]Movie, error) {
	file, err := filesystem.OpenFile("../../resources/sample_files/" + fileName)
	if err != nil {
		return nil, err
	}
	defer filesystem.CloseFile(file)

	var movies []Movie
	err = json.NewDecoder(file).Decode(&movies)
	if err != nil {
		return nil, err
	}

	return movies, nil
}



// PopulateMoviesTable reads data from the <fileName> file and inserts records into the "Movies" table.
func (runner *RedshiftBasicsScenario) PopulateMoviesTable(ctx context.Context, clusterId string, databaseName string, tableName string, userName string, fileName string) {
	log.Println("Populate the " + tableName + " table using the " + fileName + " file.")
	numRecords := runner.questioner.AskInt(
		fmt.Sprintf("Enter a value between %v and %v:", 10, 100),
		demotools.InIntRange{Lower: 10, Upper: 100})

	movies, err := runner.loadMoviesFromJSON(fileName, runner.filesystem)
	if err != nil {
		log.Printf("Failed to load movies from JSON: %v\n", err)
		panic(err)
	}

	var sqlStatements []string

	for i, movie := range movies {
		if i >= numRecords {
			break
		}

		sqlStatement := fmt.Sprintf(`INSERT INTO %s (title, year) VALUES ('%s', %d);`,
			tableName,
			strings.Replace(movie.Title, "'", "''", -1), // Double any single quotes to escape them
			movie.Year)

		sqlStatements = append(sqlStatements, sqlStatement)
	}

	input := &redshiftdata.BatchExecuteStatementInput{
		ClusterIdentifier: aws.String(clusterId),
		Database:          aws.String(databaseName),
		DbUser:            aws.String(userName),
		Sqls:              sqlStatements,
	}

	result, err := runner.redshiftDataActor.ExecuteBatchStatement(ctx, *input)
	if err != nil {
		log.Printf("Failed to execute batch statement: %v\n", err)
		panic(err)
	}

	describeInput := redshiftdata.DescribeStatementInput{
		Id: result.Id,
	}

	query := actions.RedshiftQuery{
		Context: ctx,
		Result:  result,
		Input:   describeInput,
	}
	err = runner.redshiftDataActor.WaitForQueryStatus(query, runner.pauser, true)
	if err != nil {
		log.Printf("Failed to execute batch insert query: %v\n", err)
		return
	}
	log.Printf("Successfully executed batch statement\n")

	log.Printf("%d records were added to the Movies table.\n", numRecords)
}



// QueryMoviesByYear retrieves only movies from the "Movies" table which match the given year.
func (runner *RedshiftBasicsScenario) QueryMoviesByYear(ctx context.Context, clusterId string, databaseName string, tableName string, userName string, year int) {

	sqlStatement := fmt.Sprintf(`SELECT title FROM %s WHERE year = %d;`, tableName, year)

	input := &redshiftdata.ExecuteStatementInput{
		ClusterIdentifier: aws.String(clusterId),
		Database:          aws.String(databaseName),
		DbUser:            aws.String(userName),
		Sql:               aws.String(sqlStatement),
	}

	result, err := runner.redshiftDataActor.ExecuteStatement(ctx, *input)
	if err != nil {
		log.Printf("Failed to query movies: %v\n", err)
		panic(err)
	}

	log.Println("The identifier of the statement is ", *result.Id)

	describeInput := redshiftdata.DescribeStatementInput{
		Id: result.Id,
	}

	query := actions.RedshiftQuery{
		Context: ctx,
		Input:   describeInput,
		Result:  result,
	}
	err = runner.redshiftDataActor.WaitForQueryStatus(query, runner.pauser, true)
	if err != nil {
		log.Printf("Failed to execute query: %v\n", err)
		panic(err)
	}
	log.Printf("Successfully executed query\n")

	getResultOutput, err := runner.redshiftDataActor.GetStatementResult(ctx, *result.Id)
	if err != nil {
		log.Printf("Failed to query movies: %v\n", err)
		panic(err)
	}
	for _, row := range getResultOutput.Records {
		for _, col := range row {
			title, ok := col.(*redshiftdata_types.FieldMemberStringValue)
			if !ok {
				log.Println("Failed to parse the field")
			} else {
				log.Printf("The Movie title field is %s\n", title.Value)
			}
		}
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [CreateCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.CreateCluster)
  + [DescribeClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.DescribeClusters)
  + [DescribeStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.DescribeStatement)
  + [ExecuteStatement](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.ExecuteStatement)
  + [GetStatementResult](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.GetStatementResult)
  + [ListDatabasesPaginator](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.ListDatabasesPaginator)
  + [ModifyCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.ModifyCluster)

## 작업
<a name="actions"></a>

### `CreateCluster`
<a name="redshift_CreateCluster_go_2_topic"></a>

다음 코드 예시는 `CreateCluster`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshift/types"
)



// RedshiftActions wraps Redshift service actions.
type RedshiftActions struct {
	RedshiftClient *redshift.Client
}



// CreateCluster sends a request to create a cluster with the given clusterId using the provided credentials.
func (actor RedshiftActions) CreateCluster(ctx context.Context, clusterId string, userName string, userPassword string, nodeType string, clusterType string, publiclyAccessible bool) (*redshift.CreateClusterOutput, error) {
	// Create a new Redshift cluster
	input := &redshift.CreateClusterInput{
		ClusterIdentifier:  aws.String(clusterId),
		MasterUserPassword: aws.String(userPassword),
		MasterUsername:     aws.String(userName),
		NodeType:           aws.String(nodeType),
		ClusterType:        aws.String(clusterType),
		PubliclyAccessible: aws.Bool(publiclyAccessible),
	}
	var opErr *types.ClusterAlreadyExistsFault
	output, err := actor.RedshiftClient.CreateCluster(ctx, input)
	if err != nil && errors.As(err, &opErr) {
		log.Println("Cluster already exists")
		return nil, nil
	} else if err != nil {
		log.Printf("Failed to create Redshift cluster: %v\n", err)
		return nil, err
	}

	log.Printf("Created cluster %s\n", *output.Cluster.ClusterIdentifier)
	return output, nil
}
```
+  API에 대한 세부 정보는 *AWS SDK for Go API 참조*의 [CreateCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.CreateCluster)를 참조하세요.

### `DeleteCluster`
<a name="redshift_DeleteCluster_go_2_topic"></a>

다음 코드 예시는 `DeleteCluster`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshift/types"
)



// RedshiftActions wraps Redshift service actions.
type RedshiftActions struct {
	RedshiftClient *redshift.Client
}



// DeleteCluster deletes the given cluster.
func (actor RedshiftActions) DeleteCluster(ctx context.Context, clusterId string) (bool, error) {
	input := redshift.DeleteClusterInput{
		ClusterIdentifier:        aws.String(clusterId),
		SkipFinalClusterSnapshot: aws.Bool(true),
	}
	_, err := actor.RedshiftClient.DeleteCluster(ctx, &input)
	var opErr *types.ClusterNotFoundFault
	if err != nil && errors.As(err, &opErr) {
		log.Println("Cluster was not found. Where could it be?")
		return false, err
	} else if err != nil {
		log.Printf("Failed to delete Redshift cluster: %v\n", err)
		return false, err
	}
	waiter := redshift.NewClusterDeletedWaiter(actor.RedshiftClient)
	err = waiter.Wait(ctx, &redshift.DescribeClustersInput{
		ClusterIdentifier: aws.String(clusterId),
	}, 5*time.Minute)
	if err != nil {
		log.Printf("Wait time exceeded for deleting cluster, continuing: %v\n", err)
	}
	log.Printf("The cluster %s was deleted\n", clusterId)
	return true, nil
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.DeleteCluster)를 참조하세요.

### `DescribeClusters`
<a name="redshift_DescribeClusters_go_2_topic"></a>

다음 코드 예시는 `DescribeClusters`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshift/types"
)



// RedshiftActions wraps Redshift service actions.
type RedshiftActions struct {
	RedshiftClient *redshift.Client
}



// DescribeClusters returns information about the given cluster.
func (actor RedshiftActions) DescribeClusters(ctx context.Context, clusterId string) (*redshift.DescribeClustersOutput, error) {
	input, err := actor.RedshiftClient.DescribeClusters(ctx, &redshift.DescribeClustersInput{
		ClusterIdentifier: aws.String(clusterId),
	})
	var opErr *types.AccessToClusterDeniedFault
	if errors.As(err, &opErr) {
		println("Access to cluster denied.")
		panic(err)
	} else if err != nil {
		println("Failed to describe Redshift clusters.")
		return nil, err
	}
	return input, nil
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DescribeClusters](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.DescribeClusters)를 참조하세요.

### `ModifyCluster`
<a name="redshift_ModifyCluster_go_2_topic"></a>

다음 코드 예시는 `ModifyCluster`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/redshift#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"errors"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/redshift"
	"github.com/aws/aws-sdk-go-v2/service/redshift/types"
)



// RedshiftActions wraps Redshift service actions.
type RedshiftActions struct {
	RedshiftClient *redshift.Client
}



// ModifyCluster sets the preferred maintenance window for the given cluster.
func (actor RedshiftActions) ModifyCluster(ctx context.Context, clusterId string, maintenanceWindow string) *redshift.ModifyClusterOutput {
	// Modify the cluster's maintenance window
	input := &redshift.ModifyClusterInput{
		ClusterIdentifier:          aws.String(clusterId),
		PreferredMaintenanceWindow: aws.String(maintenanceWindow),
	}

	var opErr *types.InvalidClusterStateFault
	output, err := actor.RedshiftClient.ModifyCluster(ctx, input)
	if err != nil && errors.As(err, &opErr) {
		log.Println("Cluster is in an invalid state.")
		panic(err)
	} else if err != nil {
		log.Printf("Failed to modify Redshift cluster: %v\n", err)
		panic(err)
	}

	log.Printf("The cluster was successfully modified and now has %s as the maintenance window\n", *output.Cluster.PreferredMaintenanceWindow)
	return output
}
```
+  API에 대한 세부 정보는 *AWS SDK for Go API 참조*의 [ModifyCluster](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/redshift#Client.ModifyCluster)를 참조하세요.

# SDK for Go V2를 사용한 Amazon S3 예제
<a name="go_2_s3_code_examples"></a>

다음 코드 예제에서는 Amazon S3에서 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*기본 사항*은 서비스 내에서 필수 작업을 수행하는 방법을 보여주는 코드 예제입니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [기본 사항](#basics)
+ [작업](#actions)
+ [시나리오](#scenarios)
+ [서버리스 예제](#serverless_examples)

## 시작하기
<a name="get_started"></a>

### Hello Amazon S3
<a name="s3_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon S3 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"errors"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/smithy-go"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Storage Service
// (Amazon S3) client and list up to 10 buckets in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	s3Client := s3.NewFromConfig(sdkConfig)
	count := 10
	fmt.Printf("Let's list up to %v buckets for your account.\n", count)
	result, err := s3Client.ListBuckets(ctx, &s3.ListBucketsInput{})
	if err != nil {
		var ae smithy.APIError
		if errors.As(err, &ae) && ae.ErrorCode() == "AccessDenied" {
			fmt.Println("You don't have permission to list buckets for this account.")
		} else {
			fmt.Printf("Couldn't list buckets for your account. Here's why: %v\n", err)
		}
		return
	}
	if len(result.Buckets) == 0 {
		fmt.Println("You don't have any buckets!")
	} else {
		if count > len(result.Buckets) {
			count = len(result.Buckets)
		}
		for _, bucket := range result.Buckets[:count] {
			fmt.Printf("\t%v\n", *bucket.Name)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListBuckets](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.ListBuckets)를 참조하세요.

## 기본 사항
<a name="basics"></a>

### 기본 사항 알아보기
<a name="s3_Scenario_GettingStarted_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 버킷을 만들고 버킷에 파일을 업로드합니다.
+ 버킷에서 객체를 다운로드합니다.
+ 버킷의 하위 폴더에 객체를 복사합니다.
+ 버킷의 객체를 나열합니다.
+ 버킷 객체와 버킷을 삭제합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
시나리오가 사용하는 버킷 및 객체 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// ListBuckets lists the buckets in the current account.
func (basics BucketBasics) ListBuckets(ctx context.Context) ([]types.Bucket, error) {
	var err error
	var output *s3.ListBucketsOutput
	var buckets []types.Bucket
	bucketPaginator := s3.NewListBucketsPaginator(basics.S3Client, &s3.ListBucketsInput{})
	for bucketPaginator.HasMorePages() {
		output, err = bucketPaginator.NextPage(ctx)
		if err != nil {
			var apiErr smithy.APIError
			if errors.As(err, &apiErr) && apiErr.ErrorCode() == "AccessDenied" {
				fmt.Println("You don't have permission to list buckets for this account.")
				err = apiErr
			} else {
				log.Printf("Couldn't list buckets for your account. Here's why: %v\n", err)
			}
			break
		} else {
			buckets = append(buckets, output.Buckets...)
		}
	}
	return buckets, err
}



// BucketExists checks whether a bucket exists in the current account.
func (basics BucketBasics) BucketExists(ctx context.Context, bucketName string) (bool, error) {
	_, err := basics.S3Client.HeadBucket(ctx, &s3.HeadBucketInput{
		Bucket: aws.String(bucketName),
	})
	exists := true
	if err != nil {
		var apiError smithy.APIError
		if errors.As(err, &apiError) {
			switch apiError.(type) {
			case *types.NotFound:
				log.Printf("Bucket %v is available.\n", bucketName)
				exists = false
				err = nil
			default:
				log.Printf("Either you don't have access to bucket %v or another error occurred. "+
					"Here's what happened: %v\n", bucketName, err)
			}
		}
	} else {
		log.Printf("Bucket %v exists and you already own it.", bucketName)
	}

	return exists, err
}



// CreateBucket creates a bucket with the specified name in the specified Region.
func (basics BucketBasics) CreateBucket(ctx context.Context, name string, region string) error {
	_, err := basics.S3Client.CreateBucket(ctx, &s3.CreateBucketInput{
		Bucket: aws.String(name),
		CreateBucketConfiguration: &types.CreateBucketConfiguration{
			LocationConstraint: types.BucketLocationConstraint(region),
		},
	})
	if err != nil {
		var owned *types.BucketAlreadyOwnedByYou
		var exists *types.BucketAlreadyExists
		if errors.As(err, &owned) {
			log.Printf("You already own bucket %s.\n", name)
			err = owned
		} else if errors.As(err, &exists) {
			log.Printf("Bucket %s already exists.\n", name)
			err = exists
		}
	} else {
		err = s3.NewBucketExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(name)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to exist.\n", name)
		}
	}
	return err
}



// UploadFile reads from a file and puts the data into an object in a bucket.
func (basics BucketBasics) UploadFile(ctx context.Context, bucketName string, objectKey string, fileName string) error {
	file, err := os.Open(fileName)
	if err != nil {
		log.Printf("Couldn't open file %v to upload. Here's why: %v\n", fileName, err)
	} else {
		defer file.Close()
		_, err = basics.S3Client.PutObject(ctx, &s3.PutObjectInput{
			Bucket: aws.String(bucketName),
			Key:    aws.String(objectKey),
			Body:   file,
		})
		if err != nil {
			var apiErr smithy.APIError
			if errors.As(err, &apiErr) && apiErr.ErrorCode() == "EntityTooLarge" {
				log.Printf("Error while uploading object to %s. The object is too large.\n"+
					"To upload objects larger than 5GB, use the S3 console (160GB max)\n"+
					"or the multipart upload API (5TB max).", bucketName)
			} else {
				log.Printf("Couldn't upload file %v to %v:%v. Here's why: %v\n",
					fileName, bucketName, objectKey, err)
			}
		} else {
			err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
				ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: aws.String(objectKey)}, time.Minute)
			if err != nil {
				log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
			}
		}
	}
	return err
}



// UploadLargeObject uses an upload manager to upload data to an object in a bucket.
// The upload manager breaks large data into parts and uploads the parts concurrently.
func (basics BucketBasics) UploadLargeObject(ctx context.Context, bucketName string, objectKey string, largeObject []byte) error {
	largeBuffer := bytes.NewReader(largeObject)
	var partMiBs int64 = 10
	uploader := manager.NewUploader(basics.S3Client, func(u *manager.Uploader) {
		u.PartSize = partMiBs * 1024 * 1024
	})
	_, err := uploader.Upload(ctx, &s3.PutObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
		Body:   largeBuffer,
	})
	if err != nil {
		var apiErr smithy.APIError
		if errors.As(err, &apiErr) && apiErr.ErrorCode() == "EntityTooLarge" {
			log.Printf("Error while uploading object to %s. The object is too large.\n"+
				"The maximum size for a multipart upload is 5TB.", bucketName)
		} else {
			log.Printf("Couldn't upload large object to %v:%v. Here's why: %v\n",
				bucketName, objectKey, err)
		}
	} else {
		err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: aws.String(objectKey)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
		}
	}

	return err
}



// DownloadFile gets an object from a bucket and stores it in a local file.
func (basics BucketBasics) DownloadFile(ctx context.Context, bucketName string, objectKey string, fileName string) error {
	result, err := basics.S3Client.GetObject(ctx, &s3.GetObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	})
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Can't get object %s from bucket %s. No such key exists.\n", objectKey, bucketName)
			err = noKey
		} else {
			log.Printf("Couldn't get object %v:%v. Here's why: %v\n", bucketName, objectKey, err)
		}
		return err
	}
	defer result.Body.Close()
	file, err := os.Create(fileName)
	if err != nil {
		log.Printf("Couldn't create file %v. Here's why: %v\n", fileName, err)
		return err
	}
	defer file.Close()
	body, err := io.ReadAll(result.Body)
	if err != nil {
		log.Printf("Couldn't read object body from %v. Here's why: %v\n", objectKey, err)
	}
	_, err = file.Write(body)
	return err
}



// DownloadLargeObject uses a download manager to download an object from a bucket.
// The download manager gets the data in parts and writes them to a buffer until all of
// the data has been downloaded.
func (basics BucketBasics) DownloadLargeObject(ctx context.Context, bucketName string, objectKey string) ([]byte, error) {
	var partMiBs int64 = 10
	downloader := manager.NewDownloader(basics.S3Client, func(d *manager.Downloader) {
		d.PartSize = partMiBs * 1024 * 1024
	})
	buffer := manager.NewWriteAtBuffer([]byte{})
	_, err := downloader.Download(ctx, buffer, &s3.GetObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	})
	if err != nil {
		log.Printf("Couldn't download large object from %v:%v. Here's why: %v\n",
			bucketName, objectKey, err)
	}
	return buffer.Bytes(), err
}



// CopyToFolder copies an object in a bucket to a subfolder in the same bucket.
func (basics BucketBasics) CopyToFolder(ctx context.Context, bucketName string, objectKey string, folderName string) error {
	objectDest := fmt.Sprintf("%v/%v", folderName, objectKey)
	_, err := basics.S3Client.CopyObject(ctx, &s3.CopyObjectInput{
		Bucket:     aws.String(bucketName),
		CopySource: aws.String(fmt.Sprintf("%v/%v", bucketName, objectKey)),
		Key:        aws.String(objectDest),
	})
	if err != nil {
		var notActive *types.ObjectNotInActiveTierError
		if errors.As(err, &notActive) {
			log.Printf("Couldn't copy object %s from %s because the object isn't in the active tier.\n",
				objectKey, bucketName)
			err = notActive
		}
	} else {
		err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: aws.String(objectDest)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist.\n", objectDest)
		}
	}
	return err
}



// CopyToBucket copies an object in a bucket to another bucket.
func (basics BucketBasics) CopyToBucket(ctx context.Context, sourceBucket string, destinationBucket string, objectKey string) error {
	_, err := basics.S3Client.CopyObject(ctx, &s3.CopyObjectInput{
		Bucket:     aws.String(destinationBucket),
		CopySource: aws.String(fmt.Sprintf("%v/%v", sourceBucket, objectKey)),
		Key:        aws.String(objectKey),
	})
	if err != nil {
		var notActive *types.ObjectNotInActiveTierError
		if errors.As(err, &notActive) {
			log.Printf("Couldn't copy object %s from %s because the object isn't in the active tier.\n",
				objectKey, sourceBucket)
			err = notActive
		}
	} else {
		err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(destinationBucket), Key: aws.String(objectKey)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
		}
	}
	return err
}



// ListObjects lists the objects in a bucket.
func (basics BucketBasics) ListObjects(ctx context.Context, bucketName string) ([]types.Object, error) {
	var err error
	var output *s3.ListObjectsV2Output
	input := &s3.ListObjectsV2Input{
		Bucket: aws.String(bucketName),
	}
	var objects []types.Object
	objectPaginator := s3.NewListObjectsV2Paginator(basics.S3Client, input)
	for objectPaginator.HasMorePages() {
		output, err = objectPaginator.NextPage(ctx)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucketName)
				err = noBucket
			}
			break
		} else {
			objects = append(objects, output.Contents...)
		}
	}
	return objects, err
}



// DeleteObjects deletes a list of objects from a bucket.
func (basics BucketBasics) DeleteObjects(ctx context.Context, bucketName string, objectKeys []string) error {
	var objectIds []types.ObjectIdentifier
	for _, key := range objectKeys {
		objectIds = append(objectIds, types.ObjectIdentifier{Key: aws.String(key)})
	}
	output, err := basics.S3Client.DeleteObjects(ctx, &s3.DeleteObjectsInput{
		Bucket: aws.String(bucketName),
		Delete: &types.Delete{Objects: objectIds, Quiet: aws.Bool(true)},
	})
	if err != nil || len(output.Errors) > 0 {
		log.Printf("Error deleting objects from bucket %s.\n", bucketName)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucketName)
				err = noBucket
			}
		} else if len(output.Errors) > 0 {
			for _, outErr := range output.Errors {
				log.Printf("%s: %s\n", *outErr.Key, *outErr.Message)
			}
			err = fmt.Errorf("%s", *output.Errors[0].Message)
		}
	} else {
		for _, delObjs := range output.Deleted {
			err = s3.NewObjectNotExistsWaiter(basics.S3Client).Wait(
				ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: delObjs.Key}, time.Minute)
			if err != nil {
				log.Printf("Failed attempt to wait for object %s to be deleted.\n", *delObjs.Key)
			} else {
				log.Printf("Deleted %s.\n", *delObjs.Key)
			}
		}
	}
	return err
}



// DeleteBucket deletes a bucket. The bucket must be empty or an error is returned.
func (basics BucketBasics) DeleteBucket(ctx context.Context, bucketName string) error {
	_, err := basics.S3Client.DeleteBucket(ctx, &s3.DeleteBucketInput{
		Bucket: aws.String(bucketName)})
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucketName)
			err = noBucket
		} else {
			log.Printf("Couldn't delete bucket %v. Here's why: %v\n", bucketName, err)
		}
	} else {
		err = s3.NewBucketNotExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(bucketName)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to be deleted.\n", bucketName)
		} else {
			log.Printf("Deleted %s.\n", bucketName)
		}
	}
	return err
}
```
S3 버킷과 객체를 다루는 방법을 보여주는 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/s3/actions"
)

// RunGetStartedScenario is an interactive example that shows you how to use Amazon
// Simple Storage Service (Amazon S3) to create an S3 bucket and use it to store objects.
//
// 1. Create a bucket.
// 2. Upload a local file to the bucket.
// 3. Download an object to a local file.
// 4. Copy an object to a different folder in the bucket.
// 5. List objects in the bucket.
// 6. Delete all objects in the bucket.
// 7. Delete the bucket.
//
// This example creates an Amazon S3 service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
func RunGetStartedScenario(ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			_, isMock := questioner.(*demotools.MockQuestioner)
			if isMock || questioner.AskBool("Do you want to see the full error message (y/n)?", "y") {
				log.Println(r)
			}
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon S3 getting started demo.")
	log.Println(strings.Repeat("-", 88))

	s3Client := s3.NewFromConfig(sdkConfig)
	bucketBasics := actions.BucketBasics{S3Client: s3Client}

	count := 10
	log.Printf("Let's list up to %v buckets for your account:", count)
	buckets, err := bucketBasics.ListBuckets(ctx)
	if err != nil {
		panic(err)
	}
	if len(buckets) == 0 {
		log.Println("You don't have any buckets!")
	} else {
		if count > len(buckets) {
			count = len(buckets)
		}
		for _, bucket := range buckets[:count] {
			log.Printf("\t%v\n", *bucket.Name)
		}
	}

	bucketName := questioner.Ask("Let's create a bucket. Enter a name for your bucket:",
		demotools.NotEmpty{})
	bucketExists, err := bucketBasics.BucketExists(ctx, bucketName)
	if err != nil {
		panic(err)
	}
	if !bucketExists {
		err = bucketBasics.CreateBucket(ctx, bucketName, sdkConfig.Region)
		if err != nil {
			panic(err)
		} else {
			log.Println("Bucket created.")
		}
	}
	log.Println(strings.Repeat("-", 88))

	fmt.Println("Let's upload a file to your bucket.")
	smallFile := questioner.Ask("Enter the path to a file you want to upload:",
		demotools.NotEmpty{})
	const smallKey = "doc-example-key"
	err = bucketBasics.UploadFile(ctx, bucketName, smallKey, smallFile)
	if err != nil {
		panic(err)
	}
	log.Printf("Uploaded %v as %v.\n", smallFile, smallKey)
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's download %v to a file.", smallKey)
	downloadFileName := questioner.Ask("Enter a name for the downloaded file:", demotools.NotEmpty{})
	err = bucketBasics.DownloadFile(ctx, bucketName, smallKey, downloadFileName)
	if err != nil {
		panic(err)
	}
	log.Printf("File %v downloaded.", downloadFileName)
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's copy %v to a folder in the same bucket.", smallKey)
	folderName := questioner.Ask("Enter a folder name: ", demotools.NotEmpty{})
	err = bucketBasics.CopyToFolder(ctx, bucketName, smallKey, folderName)
	if err != nil {
		panic(err)
	}
	log.Printf("Copied %v to %v/%v.\n", smallKey, folderName, smallKey)
	log.Println(strings.Repeat("-", 88))

	log.Println("Let's list the objects in your bucket.")
	questioner.Ask("Press Enter when you're ready.")
	objects, err := bucketBasics.ListObjects(ctx, bucketName)
	if err != nil {
		panic(err)
	}
	log.Printf("Found %v objects.\n", len(objects))
	var objKeys []string
	for _, object := range objects {
		objKeys = append(objKeys, *object.Key)
		log.Printf("\t%v\n", *object.Key)
	}
	log.Println(strings.Repeat("-", 88))

	if questioner.AskBool("Do you want to delete your bucket and all of its "+
		"contents? (y/n)", "y") {
		log.Println("Deleting objects.")
		err = bucketBasics.DeleteObjects(ctx, bucketName, objKeys)
		if err != nil {
			panic(err)
		}
		log.Println("Deleting bucket.")
		err = bucketBasics.DeleteBucket(ctx, bucketName)
		if err != nil {
			panic(err)
		}
		log.Printf("Deleting downloaded file %v.\n", downloadFileName)
		err = os.Remove(downloadFileName)
		if err != nil {
			panic(err)
		}
	} else {
		log.Println("Okay. Don't forget to delete objects from your bucket to avoid charges.")
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 항목을 참조하세요.
  + [CopyObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.CopyObject)
  + [CreateBucket](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.CreateBucket)
  + [DeleteBucket](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.DeleteBucket)
  + [DeleteObjects](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.DeleteObjects)
  + [GetObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObject)
  + [ListObjectsV2](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.ListObjectsV2)
  + [PutObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObject)

## 작업
<a name="actions"></a>

### `CopyObject`
<a name="s3_CopyObject_go_2_topic"></a>

다음 코드 예시는 `CopyObject`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// CopyToBucket copies an object in a bucket to another bucket.
func (basics BucketBasics) CopyToBucket(ctx context.Context, sourceBucket string, destinationBucket string, objectKey string) error {
	_, err := basics.S3Client.CopyObject(ctx, &s3.CopyObjectInput{
		Bucket:     aws.String(destinationBucket),
		CopySource: aws.String(fmt.Sprintf("%v/%v", sourceBucket, objectKey)),
		Key:        aws.String(objectKey),
	})
	if err != nil {
		var notActive *types.ObjectNotInActiveTierError
		if errors.As(err, &notActive) {
			log.Printf("Couldn't copy object %s from %s because the object isn't in the active tier.\n",
				objectKey, sourceBucket)
			err = notActive
		}
	} else {
		err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(destinationBucket), Key: aws.String(objectKey)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CopyObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.CopyObject)를 참조하세요.

### `CreateBucket`
<a name="s3_CreateBucket_go_2_topic"></a>

다음 코드 예시는 `CreateBucket`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
기본 구성으로 버킷을 생성합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// CreateBucket creates a bucket with the specified name in the specified Region.
func (basics BucketBasics) CreateBucket(ctx context.Context, name string, region string) error {
	_, err := basics.S3Client.CreateBucket(ctx, &s3.CreateBucketInput{
		Bucket: aws.String(name),
		CreateBucketConfiguration: &types.CreateBucketConfiguration{
			LocationConstraint: types.BucketLocationConstraint(region),
		},
	})
	if err != nil {
		var owned *types.BucketAlreadyOwnedByYou
		var exists *types.BucketAlreadyExists
		if errors.As(err, &owned) {
			log.Printf("You already own bucket %s.\n", name)
			err = owned
		} else if errors.As(err, &exists) {
			log.Printf("Bucket %s already exists.\n", name)
			err = exists
		}
	} else {
		err = s3.NewBucketExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(name)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to exist.\n", name)
		}
	}
	return err
}
```
객체 잠금 기능이 있는 버킷을 만들고 버킷이 존재할 때까지 기다립니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// CreateBucketWithLock creates a new S3 bucket with optional object locking enabled
// and waits for the bucket to exist before returning.
func (actor S3Actions) CreateBucketWithLock(ctx context.Context, bucket string, region string, enableObjectLock bool) (string, error) {
	input := &s3.CreateBucketInput{
		Bucket: aws.String(bucket),
		CreateBucketConfiguration: &types.CreateBucketConfiguration{
			LocationConstraint: types.BucketLocationConstraint(region),
		},
	}

	if enableObjectLock {
		input.ObjectLockEnabledForBucket = aws.Bool(true)
	}

	_, err := actor.S3Client.CreateBucket(ctx, input)
	if err != nil {
		var owned *types.BucketAlreadyOwnedByYou
		var exists *types.BucketAlreadyExists
		if errors.As(err, &owned) {
			log.Printf("You already own bucket %s.\n", bucket)
			err = owned
		} else if errors.As(err, &exists) {
			log.Printf("Bucket %s already exists.\n", bucket)
			err = exists
		}
	} else {
		err = s3.NewBucketExistsWaiter(actor.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(bucket)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to exist.\n", bucket)
		}
	}

	return bucket, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateBucket](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.CreateBucket)을 참조하세요.

### `DeleteBucket`
<a name="s3_DeleteBucket_go_2_topic"></a>

다음 코드 예시는 `DeleteBucket`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// DeleteBucket deletes a bucket. The bucket must be empty or an error is returned.
func (basics BucketBasics) DeleteBucket(ctx context.Context, bucketName string) error {
	_, err := basics.S3Client.DeleteBucket(ctx, &s3.DeleteBucketInput{
		Bucket: aws.String(bucketName)})
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucketName)
			err = noBucket
		} else {
			log.Printf("Couldn't delete bucket %v. Here's why: %v\n", bucketName, err)
		}
	} else {
		err = s3.NewBucketNotExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(bucketName)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to be deleted.\n", bucketName)
		} else {
			log.Printf("Deleted %s.\n", bucketName)
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteBucket](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.DeleteBucket)을 참조하세요.

### `DeleteObject`
<a name="s3_DeleteObject_go_2_topic"></a>

다음 코드 예시는 `DeleteObject`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// DeleteObject deletes an object from a bucket.
func (actor S3Actions) DeleteObject(ctx context.Context, bucket string, key string, versionId string, bypassGovernance bool) (bool, error) {
	deleted := false
	input := &s3.DeleteObjectInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
	}
	if versionId != "" {
		input.VersionId = aws.String(versionId)
	}
	if bypassGovernance {
		input.BypassGovernanceRetention = aws.Bool(true)
	}
	_, err := actor.S3Client.DeleteObject(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in %s.\n", key, bucket)
			err = noKey
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "AccessDenied":
				log.Printf("Access denied: cannot delete object %s from %s.\n", key, bucket)
				err = nil
			case "InvalidArgument":
				if bypassGovernance {
					log.Printf("You cannot specify bypass governance on a bucket without lock enabled.")
					err = nil
				}
			}
		}
	} else {
		err = s3.NewObjectNotExistsWaiter(actor.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(bucket), Key: aws.String(key)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s in bucket %s to be deleted.\n", key, bucket)
		} else {
			deleted = true
		}
	}
	return deleted, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.DeleteObject)를 참조하세요.

### `DeleteObjects`
<a name="s3_DeleteObjects_go_2_topic"></a>

다음 코드 예시는 `DeleteObjects`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// DeleteObjects deletes a list of objects from a bucket.
func (actor S3Actions) DeleteObjects(ctx context.Context, bucket string, objects []types.ObjectIdentifier, bypassGovernance bool) error {
	if len(objects) == 0 {
		return nil
	}

	input := s3.DeleteObjectsInput{
		Bucket: aws.String(bucket),
		Delete: &types.Delete{
			Objects: objects,
			Quiet:   aws.Bool(true),
		},
	}
	if bypassGovernance {
		input.BypassGovernanceRetention = aws.Bool(true)
	}
	delOut, err := actor.S3Client.DeleteObjects(ctx, &input)
	if err != nil || len(delOut.Errors) > 0 {
		log.Printf("Error deleting objects from bucket %s.\n", bucket)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucket)
				err = noBucket
			}
		} else if len(delOut.Errors) > 0 {
			for _, outErr := range delOut.Errors {
				log.Printf("%s: %s\n", *outErr.Key, *outErr.Message)
			}
			err = fmt.Errorf("%s", *delOut.Errors[0].Message)
		}
	} else {
		for _, delObjs := range delOut.Deleted {
			err = s3.NewObjectNotExistsWaiter(actor.S3Client).Wait(
				ctx, &s3.HeadObjectInput{Bucket: aws.String(bucket), Key: delObjs.Key}, time.Minute)
			if err != nil {
				log.Printf("Failed attempt to wait for object %s to be deleted.\n", *delObjs.Key)
			} else {
				log.Printf("Deleted %s.\n", *delObjs.Key)
			}
		}
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteObjects](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.DeleteObjects)를 참조하세요.

### `GetObject`
<a name="s3_GetObject_go_2_topic"></a>

다음 코드 예시는 `GetObject`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// DownloadFile gets an object from a bucket and stores it in a local file.
func (basics BucketBasics) DownloadFile(ctx context.Context, bucketName string, objectKey string, fileName string) error {
	result, err := basics.S3Client.GetObject(ctx, &s3.GetObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	})
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Can't get object %s from bucket %s. No such key exists.\n", objectKey, bucketName)
			err = noKey
		} else {
			log.Printf("Couldn't get object %v:%v. Here's why: %v\n", bucketName, objectKey, err)
		}
		return err
	}
	defer result.Body.Close()
	file, err := os.Create(fileName)
	if err != nil {
		log.Printf("Couldn't create file %v. Here's why: %v\n", fileName, err)
		return err
	}
	defer file.Close()
	body, err := io.ReadAll(result.Body)
	if err != nil {
		log.Printf("Couldn't read object body from %v. Here's why: %v\n", objectKey, err)
	}
	_, err = file.Write(body)
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObject)를 참조하세요.

### `GetObjectLegalHold`
<a name="s3_GetObjectLegalHold_go_2_topic"></a>

다음 코드 예시는 `GetObjectLegalHold`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// GetObjectLegalHold retrieves the legal hold status for an S3 object.
func (actor S3Actions) GetObjectLegalHold(ctx context.Context, bucket string, key string, versionId string) (*types.ObjectLockLegalHoldStatus, error) {
	var status *types.ObjectLockLegalHoldStatus
	input := &s3.GetObjectLegalHoldInput{
		Bucket:    aws.String(bucket),
		Key:       aws.String(key),
		VersionId: aws.String(versionId),
	}

	output, err := actor.S3Client.GetObjectLegalHold(ctx, input)
	if err != nil {
		var noSuchKeyErr *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noSuchKeyErr) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noSuchKeyErr
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "NoSuchObjectLockConfiguration":
				log.Printf("Object %s does not have an object lock configuration.\n", key)
				err = nil
			case "InvalidRequest":
				log.Printf("Bucket %s does not have an object lock configuration.\n", bucket)
				err = nil
			}
		}
	} else {
		status = &output.LegalHold.Status
	}

	return status, err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [GetObjectLegalHold](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectLegalHold)를 참조하세요.

### `GetObjectLockConfiguration`
<a name="s3_GetObjectLockConfiguration_go_2_topic"></a>

다음 코드 예시는 `GetObjectLockConfiguration`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// GetObjectLockConfiguration retrieves the object lock configuration for an S3 bucket.
func (actor S3Actions) GetObjectLockConfiguration(ctx context.Context, bucket string) (*types.ObjectLockConfiguration, error) {
	var lockConfig *types.ObjectLockConfiguration
	input := &s3.GetObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
	}

	output, err := actor.S3Client.GetObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		} else if errors.As(err, &apiErr) && apiErr.ErrorCode() == "ObjectLockConfigurationNotFoundError" {
			log.Printf("Bucket %s does not have an object lock configuration.\n", bucket)
			err = nil
		}
	} else {
		lockConfig = output.ObjectLockConfiguration
	}

	return lockConfig, err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [GetObjectLockConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectLockConfiguration)을 참조하세요.

### `GetObjectRetention`
<a name="s3_GetObjectRetention_go_2_topic"></a>

다음 코드 예시는 `GetObjectRetention`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// GetObjectRetention retrieves the object retention configuration for an S3 object.
func (actor S3Actions) GetObjectRetention(ctx context.Context, bucket string, key string) (*types.ObjectLockRetention, error) {
	var retention *types.ObjectLockRetention
	input := &s3.GetObjectRetentionInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
	}

	output, err := actor.S3Client.GetObjectRetention(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "NoSuchObjectLockConfiguration":
				err = nil
			case "InvalidRequest":
				log.Printf("Bucket %s does not have locking enabled.", bucket)
				err = nil
			}
		}
	} else {
		retention = output.Retention
	}

	return retention, err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [GetObjectRetention](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectRetention)을 참조하세요.

### `HeadBucket`
<a name="s3_HeadBucket_go_2_topic"></a>

다음 코드 예시는 `HeadBucket`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// BucketExists checks whether a bucket exists in the current account.
func (basics BucketBasics) BucketExists(ctx context.Context, bucketName string) (bool, error) {
	_, err := basics.S3Client.HeadBucket(ctx, &s3.HeadBucketInput{
		Bucket: aws.String(bucketName),
	})
	exists := true
	if err != nil {
		var apiError smithy.APIError
		if errors.As(err, &apiError) {
			switch apiError.(type) {
			case *types.NotFound:
				log.Printf("Bucket %v is available.\n", bucketName)
				exists = false
				err = nil
			default:
				log.Printf("Either you don't have access to bucket %v or another error occurred. "+
					"Here's what happened: %v\n", bucketName, err)
			}
		}
	} else {
		log.Printf("Bucket %v exists and you already own it.", bucketName)
	}

	return exists, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [HeadBucket](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.HeadBucket)을 참조하세요.

### `ListBuckets`
<a name="s3_ListBuckets_go_2_topic"></a>

다음 코드 예시는 `ListBuckets`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// ListBuckets lists the buckets in the current account.
func (basics BucketBasics) ListBuckets(ctx context.Context) ([]types.Bucket, error) {
	var err error
	var output *s3.ListBucketsOutput
	var buckets []types.Bucket
	bucketPaginator := s3.NewListBucketsPaginator(basics.S3Client, &s3.ListBucketsInput{})
	for bucketPaginator.HasMorePages() {
		output, err = bucketPaginator.NextPage(ctx)
		if err != nil {
			var apiErr smithy.APIError
			if errors.As(err, &apiErr) && apiErr.ErrorCode() == "AccessDenied" {
				fmt.Println("You don't have permission to list buckets for this account.")
				err = apiErr
			} else {
				log.Printf("Couldn't list buckets for your account. Here's why: %v\n", err)
			}
			break
		} else {
			buckets = append(buckets, output.Buckets...)
		}
	}
	return buckets, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListBuckets](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.ListBuckets)를 참조하세요.

### `ListObjectVersions`
<a name="s3_ListObjectVersions_go_2_topic"></a>

다음 코드 예시는 `ListObjectVersions`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// ListObjectVersions lists all versions of all objects in a bucket.
func (actor S3Actions) ListObjectVersions(ctx context.Context, bucket string) ([]types.ObjectVersion, error) {
	var err error
	var output *s3.ListObjectVersionsOutput
	var versions []types.ObjectVersion
	input := &s3.ListObjectVersionsInput{Bucket: aws.String(bucket)}
	versionPaginator := s3.NewListObjectVersionsPaginator(actor.S3Client, input)
	for versionPaginator.HasMorePages() {
		output, err = versionPaginator.NextPage(ctx)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucket)
				err = noBucket
			}
			break
		} else {
			versions = append(versions, output.Versions...)
		}
	}
	return versions, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListObjectVersions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.ListObjectVersions)를 참조하세요.

### `ListObjectsV2`
<a name="s3_ListObjectsV2_go_2_topic"></a>

다음 코드 예시는 `ListObjectsV2`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// ListObjects lists the objects in a bucket.
func (basics BucketBasics) ListObjects(ctx context.Context, bucketName string) ([]types.Object, error) {
	var err error
	var output *s3.ListObjectsV2Output
	input := &s3.ListObjectsV2Input{
		Bucket: aws.String(bucketName),
	}
	var objects []types.Object
	objectPaginator := s3.NewListObjectsV2Paginator(basics.S3Client, input)
	for objectPaginator.HasMorePages() {
		output, err = objectPaginator.NextPage(ctx)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucketName)
				err = noBucket
			}
			break
		} else {
			objects = append(objects, output.Contents...)
		}
	}
	return objects, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListObjectsV2](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.ListObjectsV2)를 참조하세요.

### `PutObject`
<a name="s3_PutObject_go_2_topic"></a>

다음 코드 예시는 `PutObject`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
하위 수준 API를 사용하여 버킷에 객체를 추가합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// UploadFile reads from a file and puts the data into an object in a bucket.
func (basics BucketBasics) UploadFile(ctx context.Context, bucketName string, objectKey string, fileName string) error {
	file, err := os.Open(fileName)
	if err != nil {
		log.Printf("Couldn't open file %v to upload. Here's why: %v\n", fileName, err)
	} else {
		defer file.Close()
		_, err = basics.S3Client.PutObject(ctx, &s3.PutObjectInput{
			Bucket: aws.String(bucketName),
			Key:    aws.String(objectKey),
			Body:   file,
		})
		if err != nil {
			var apiErr smithy.APIError
			if errors.As(err, &apiErr) && apiErr.ErrorCode() == "EntityTooLarge" {
				log.Printf("Error while uploading object to %s. The object is too large.\n"+
					"To upload objects larger than 5GB, use the S3 console (160GB max)\n"+
					"or the multipart upload API (5TB max).", bucketName)
			} else {
				log.Printf("Couldn't upload file %v to %v:%v. Here's why: %v\n",
					fileName, bucketName, objectKey, err)
			}
		} else {
			err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
				ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: aws.String(objectKey)}, time.Minute)
			if err != nil {
				log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
			}
		}
	}
	return err
}
```
전송 관리자를 사용하여 버킷에 객체를 업로드합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// UploadObject uses the S3 upload manager to upload an object to a bucket.
func (actor S3Actions) UploadObject(ctx context.Context, bucket string, key string, contents string) (string, error) {
	var outKey string
	input := &s3.PutObjectInput{
		Bucket:            aws.String(bucket),
		Key:               aws.String(key),
		Body:              bytes.NewReader([]byte(contents)),
		ChecksumAlgorithm: types.ChecksumAlgorithmSha256,
	}
	output, err := actor.S3Manager.Upload(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	} else {
		err := s3.NewObjectExistsWaiter(actor.S3Client).Wait(ctx, &s3.HeadObjectInput{
			Bucket: aws.String(bucket),
			Key:    aws.String(key),
		}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist in %s.\n", key, bucket)
		} else {
			outKey = *output.Key
		}
	}
	return outKey, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [PutObject](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObject)를 참조하세요.

### `PutObjectLegalHold`
<a name="s3_PutObjectLegalHold_go_2_topic"></a>

다음 코드 예시는 `PutObjectLegalHold`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// PutObjectLegalHold sets the legal hold configuration for an S3 object.
func (actor S3Actions) PutObjectLegalHold(ctx context.Context, bucket string, key string, versionId string, legalHoldStatus types.ObjectLockLegalHoldStatus) error {
	input := &s3.PutObjectLegalHoldInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
		LegalHold: &types.ObjectLockLegalHold{
			Status: legalHoldStatus,
		},
	}
	if versionId != "" {
		input.VersionId = aws.String(versionId)
	}

	_, err := actor.S3Client.PutObjectLegalHold(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		}
	}

	return err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [PutObjectLegalHold](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectLegalHold)를 참조하세요.

### `PutObjectLockConfiguration`
<a name="s3_PutObjectLockConfiguration_go_2_topic"></a>

다음 코드 예시는 `PutObjectLockConfiguration`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
버킷의 객체 잠금 구성을 설정합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// EnableObjectLockOnBucket enables object locking on an existing bucket.
func (actor S3Actions) EnableObjectLockOnBucket(ctx context.Context, bucket string) error {
	// Versioning must be enabled on the bucket before object locking is enabled.
	verInput := &s3.PutBucketVersioningInput{
		Bucket: aws.String(bucket),
		VersioningConfiguration: &types.VersioningConfiguration{
			MFADelete: types.MFADeleteDisabled,
			Status:    types.BucketVersioningStatusEnabled,
		},
	}
	_, err := actor.S3Client.PutBucketVersioning(ctx, verInput)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
		return err
	}

	input := &s3.PutObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
		ObjectLockConfiguration: &types.ObjectLockConfiguration{
			ObjectLockEnabled: types.ObjectLockEnabledEnabled,
		},
	}
	_, err = actor.S3Client.PutObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	}

	return err
}
```
버킷의 기본 보존 기간을 설정합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// ModifyDefaultBucketRetention modifies the default retention period of an existing bucket.
func (actor S3Actions) ModifyDefaultBucketRetention(
	ctx context.Context, bucket string, lockMode types.ObjectLockEnabled, retentionPeriod int32, retentionMode types.ObjectLockRetentionMode) error {

	input := &s3.PutObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
		ObjectLockConfiguration: &types.ObjectLockConfiguration{
			ObjectLockEnabled: lockMode,
			Rule: &types.ObjectLockRule{
				DefaultRetention: &types.DefaultRetention{
					Days: aws.Int32(retentionPeriod),
					Mode: retentionMode,
				},
			},
		},
	}
	_, err := actor.S3Client.PutObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	}

	return err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [PutObjectLockConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectLockConfiguration)을 참조하세요.

### `PutObjectRetention`
<a name="s3_PutObjectRetention_go_2_topic"></a>

다음 코드 예시는 `PutObjectRetention`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// PutObjectRetention sets the object retention configuration for an S3 object.
func (actor S3Actions) PutObjectRetention(ctx context.Context, bucket string, key string, retentionMode types.ObjectLockRetentionMode, retentionPeriodDays int32) error {
	input := &s3.PutObjectRetentionInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
		Retention: &types.ObjectLockRetention{
			Mode:            retentionMode,
			RetainUntilDate: aws.Time(time.Now().AddDate(0, 0, int(retentionPeriodDays))),
		},
		BypassGovernanceRetention: aws.Bool(true),
	}

	_, err := actor.S3Client.PutObjectRetention(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		}
	}

	return err
}
```
+  API 세부 정보는 **AWS SDK for Go API 참조의 [PutObjectRetention](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectRetention)을 참조하세요.

## 시나리오
<a name="scenarios"></a>

### 미리 서명된 URL 생성
<a name="s3_Scenario_PresignedUrl_go_2_topic"></a>

다음 코드 예제에서는 Amazon S3에 대해 미리 서명된 URL을 생성하고 객체를 업로드하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
S3 미리 서명 작업을 래핑하는 함수를 만듭니다.  

```
import (
	"context"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	"github.com/aws/aws-sdk-go-v2/service/s3"
)

// Presigner encapsulates the Amazon Simple Storage Service (Amazon S3) presign actions
// used in the examples.
// It contains PresignClient, a client that is used to presign requests to Amazon S3.
// Presigned requests contain temporary credentials and can be made from any HTTP client.
type Presigner struct {
	PresignClient *s3.PresignClient
}



// GetObject makes a presigned request that can be used to get an object from a bucket.
// The presigned request is valid for the specified number of seconds.
func (presigner Presigner) GetObject(
	ctx context.Context, bucketName string, objectKey string, lifetimeSecs int64) (*v4.PresignedHTTPRequest, error) {
	request, err := presigner.PresignClient.PresignGetObject(ctx, &s3.GetObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	}, func(opts *s3.PresignOptions) {
		opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
	})
	if err != nil {
		log.Printf("Couldn't get a presigned request to get %v:%v. Here's why: %v\n",
			bucketName, objectKey, err)
	}
	return request, err
}



// PutObject makes a presigned request that can be used to put an object in a bucket.
// The presigned request is valid for the specified number of seconds.
func (presigner Presigner) PutObject(
	ctx context.Context, bucketName string, objectKey string, lifetimeSecs int64) (*v4.PresignedHTTPRequest, error) {
	request, err := presigner.PresignClient.PresignPutObject(ctx, &s3.PutObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	}, func(opts *s3.PresignOptions) {
		opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
	})
	if err != nil {
		log.Printf("Couldn't get a presigned request to put %v:%v. Here's why: %v\n",
			bucketName, objectKey, err)
	}
	return request, err
}



// DeleteObject makes a presigned request that can be used to delete an object from a bucket.
func (presigner Presigner) DeleteObject(ctx context.Context, bucketName string, objectKey string) (*v4.PresignedHTTPRequest, error) {
	request, err := presigner.PresignClient.PresignDeleteObject(ctx, &s3.DeleteObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	})
	if err != nil {
		log.Printf("Couldn't get a presigned request to delete object %v. Here's why: %v\n", objectKey, err)
	}
	return request, err
}



func (presigner Presigner) PresignPostObject(ctx context.Context, bucketName string, objectKey string, lifetimeSecs int64) (*s3.PresignedPostRequest, error) {
	request, err := presigner.PresignClient.PresignPostObject(ctx, &s3.PutObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	}, func(options *s3.PresignPostOptions) {
		options.Expires = time.Duration(lifetimeSecs) * time.Second
	})
	if err != nil {
		log.Printf("Couldn't get a presigned post request to put %v:%v. Here's why: %v\n", bucketName, objectKey, err)
	}
	return request, nil
}
```
미리 서명된 URL을 생성하고 사용하여 S3 객체를 업로드, 다운로드, 삭제하는 대화형 예제를 실행합니다.  

```
import (
	"bytes"
	"context"
	"io"
	"log"
	"mime/multipart"
	"net/http"
	"os"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/s3/actions"
)



// RunPresigningScenario is an interactive example that shows you how to get presigned
// HTTP requests that you can use to move data into and out of Amazon Simple Storage
// Service (Amazon S3). The presigned requests contain temporary credentials and can
// be used by an HTTP client.
//
// 1. Get a presigned request to put an object in a bucket.
// 2. Use the net/http package to use the presigned request to upload a local file to the bucket.
// 3. Get a presigned request to get an object from a bucket.
// 4. Use the net/http package to use the presigned request to download the object to a local file.
// 5. Get a presigned request to delete an object from a bucket.
// 6. Use the net/http package to use the presigned request to delete the object.
//
// This example creates an Amazon S3 presign client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
//
// It uses an IHttpRequester interface to abstract HTTP requests so they can be mocked
// during testing.
func RunPresigningScenario(ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner, httpRequester IHttpRequester) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			_, isMock := questioner.(*demotools.MockQuestioner)
			if isMock || questioner.AskBool("Do you want to see the full error message (y/n)?", "y") {
				log.Println(r)
			}
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon S3 presigning demo.")
	log.Println(strings.Repeat("-", 88))

	s3Client := s3.NewFromConfig(sdkConfig)
	bucketBasics := actions.BucketBasics{S3Client: s3Client}
	presignClient := s3.NewPresignClient(s3Client)
	presigner := actions.Presigner{PresignClient: presignClient}

	bucketName := questioner.Ask("We'll need a bucket. Enter a name for a bucket "+
		"you own or one you want to create:", demotools.NotEmpty{})
	bucketExists, err := bucketBasics.BucketExists(ctx, bucketName)
	if err != nil {
		panic(err)
	}
	if !bucketExists {
		err = bucketBasics.CreateBucket(ctx, bucketName, sdkConfig.Region)
		if err != nil {
			panic(err)
		} else {
			log.Println("Bucket created.")
		}
	}
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's presign a request to upload a file to your bucket.")
	uploadFilename := questioner.Ask("Enter the path to a file you want to upload:",
		demotools.NotEmpty{})
	uploadKey := questioner.Ask("What would you like to name the uploaded object?",
		demotools.NotEmpty{})
	uploadFile, err := os.Open(uploadFilename)
	if err != nil {
		panic(err)
	}
	defer uploadFile.Close()
	presignedPutRequest, err := presigner.PutObject(ctx, bucketName, uploadKey, 60)
	if err != nil {
		panic(err)
	}
	log.Printf("Got a presigned %v request to URL:\n\t%v\n", presignedPutRequest.Method,
		presignedPutRequest.URL)
	log.Println("Using net/http to send the request...")
	info, err := uploadFile.Stat()
	if err != nil {
		panic(err)
	}
	putResponse, err := httpRequester.Put(presignedPutRequest.URL, info.Size(), uploadFile)
	if err != nil {
		panic(err)
	}
	log.Printf("%v object %v with presigned URL returned %v.", presignedPutRequest.Method,
		uploadKey, putResponse.StatusCode)
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's presign a request to download the object.")
	questioner.Ask("Press Enter when you're ready.")
	presignedGetRequest, err := presigner.GetObject(ctx, bucketName, uploadKey, 60)
	if err != nil {
		panic(err)
	}
	log.Printf("Got a presigned %v request to URL:\n\t%v\n", presignedGetRequest.Method,
		presignedGetRequest.URL)
	log.Println("Using net/http to send the request...")
	getResponse, err := httpRequester.Get(presignedGetRequest.URL)
	if err != nil {
		panic(err)
	}
	log.Printf("%v object %v with presigned URL returned %v.", presignedGetRequest.Method,
		uploadKey, getResponse.StatusCode)
	defer getResponse.Body.Close()
	downloadBody, err := io.ReadAll(getResponse.Body)
	if err != nil {
		panic(err)
	}
	log.Printf("Downloaded %v bytes. Here are the first 100 of them:\n", len(downloadBody))
	log.Println(strings.Repeat("-", 88))
	log.Println(string(downloadBody[:100]))
	log.Println(strings.Repeat("-", 88))

	log.Println("Now we'll create a new request to put the same object using a presigned post request")
	questioner.Ask("Press Enter when you're ready.")
	presignPostRequest, err := presigner.PresignPostObject(ctx, bucketName, uploadKey, 60)
	if err != nil {
		panic(err)
	}
	log.Printf("Got a presigned post request to url %v with values %v\n", presignPostRequest.URL, presignPostRequest.Values)
	log.Println("Using net/http multipart to send the request...")
	uploadFile, err = os.Open(uploadFilename)
	if err != nil {
		panic(err)
	}
	defer uploadFile.Close()
	multiPartResponse, err := sendMultipartRequest(presignPostRequest.URL, presignPostRequest.Values, uploadFile, uploadKey, httpRequester)
	if err != nil {
		panic(err)
	}
	log.Printf("Presign post object %v with presigned URL returned %v.", uploadKey, multiPartResponse.StatusCode)

	log.Println("Let's presign a request to delete the object.")
	questioner.Ask("Press Enter when you're ready.")
	presignedDelRequest, err := presigner.DeleteObject(ctx, bucketName, uploadKey)
	if err != nil {
		panic(err)
	}
	log.Printf("Got a presigned %v request to URL:\n\t%v\n", presignedDelRequest.Method,
		presignedDelRequest.URL)
	log.Println("Using net/http to send the request...")
	delResponse, err := httpRequester.Delete(presignedDelRequest.URL)
	if err != nil {
		panic(err)
	}
	log.Printf("%v object %v with presigned URL returned %v.\n", presignedDelRequest.Method,
		uploadKey, delResponse.StatusCode)
	log.Println(strings.Repeat("-", 88))

	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
예제가 HTTP 요청을 만드는 데 사용되는 HTTP 요청 래퍼를 정의합니다.  

```
// IHttpRequester abstracts HTTP requests into an interface so it can be mocked during
// unit testing.
type IHttpRequester interface {
	Get(url string) (resp *http.Response, err error)
	Post(url, contentType string, body io.Reader) (resp *http.Response, err error)
	Put(url string, contentLength int64, body io.Reader) (resp *http.Response, err error)
	Delete(url string) (resp *http.Response, err error)
}

// HttpRequester uses the net/http package to make HTTP requests during the scenario.
type HttpRequester struct{}

func (httpReq HttpRequester) Get(url string) (resp *http.Response, err error) {
	return http.Get(url)
}
func (httpReq HttpRequester) Post(url, contentType string, body io.Reader) (resp *http.Response, err error) {
	postRequest, err := http.NewRequest("POST", url, body)
	if err != nil {
		return nil, err
	}
	postRequest.Header.Set("Content-Type", contentType)
	return http.DefaultClient.Do(postRequest)
}

func (httpReq HttpRequester) Put(url string, contentLength int64, body io.Reader) (resp *http.Response, err error) {
	putRequest, err := http.NewRequest("PUT", url, body)
	if err != nil {
		return nil, err
	}
	putRequest.ContentLength = contentLength
	return http.DefaultClient.Do(putRequest)
}
func (httpReq HttpRequester) Delete(url string) (resp *http.Response, err error) {
	delRequest, err := http.NewRequest("DELETE", url, nil)
	if err != nil {
		return nil, err
	}
	return http.DefaultClient.Do(delRequest)
}
```

### Amazon S3 객체 잠그기
<a name="s3_Scenario_ObjectLock_go_2_topic"></a>

다음 코드 예시에는 S3 객체 잠금 기능을 사용하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/s3_object_lock#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
Amazon S3 객체 잠금 기능을 시연하는 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"strings"

	"s3_object_lock/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// ObjectLockScenario contains the steps to run the S3 Object Lock workflow.
type ObjectLockScenario struct {
	questioner demotools.IQuestioner
	resources  Resources
	s3Actions  *actions.S3Actions
	sdkConfig  aws.Config
}

// NewObjectLockScenario constructs a new ObjectLockScenario instance.
func NewObjectLockScenario(sdkConfig aws.Config, questioner demotools.IQuestioner) ObjectLockScenario {
	scenario := ObjectLockScenario{
		questioner: questioner,
		resources:  Resources{},
		s3Actions:  &actions.S3Actions{S3Client: s3.NewFromConfig(sdkConfig)},
		sdkConfig:  sdkConfig,
	}
	scenario.s3Actions.S3Manager = manager.NewUploader(scenario.s3Actions.S3Client)
	scenario.resources.init(scenario.s3Actions, questioner)
	return scenario
}

type nameLocked struct {
	name   string
	locked bool
}

var createInfo = []nameLocked{
	{"standard-bucket", false},
	{"lock-bucket", true},
	{"retention-bucket", false},
}

// CreateBuckets creates the S3 buckets required for the workflow.
func (scenario *ObjectLockScenario) CreateBuckets(ctx context.Context) {
	log.Println("Let's create some S3 buckets to use for this workflow.")
	success := false
	for !success {
		prefix := scenario.questioner.Ask(
			"This example creates three buckets. Enter a prefix to name your buckets (remember bucket names must be globally unique):")

		for _, info := range createInfo {
			log.Println(fmt.Sprintf("%s.%s", prefix, info.name))
			bucketName, err := scenario.s3Actions.CreateBucketWithLock(ctx, fmt.Sprintf("%s.%s", prefix, info.name), scenario.sdkConfig.Region, info.locked)
			if err != nil {
				switch err.(type) {
				case *types.BucketAlreadyExists, *types.BucketAlreadyOwnedByYou:
					log.Printf("Couldn't create bucket %s.\n", bucketName)
				default:
					panic(err)
				}
				break
			}
			scenario.resources.demoBuckets[info.name] = &DemoBucket{
				name:       bucketName,
				objectKeys: []string{},
			}
			log.Printf("Created bucket %s.\n", bucketName)
		}

		if len(scenario.resources.demoBuckets) < len(createInfo) {
			scenario.resources.deleteBuckets(ctx)
		} else {
			success = true
		}
	}

	log.Println("S3 buckets created.")
	log.Println(strings.Repeat("-", 88))
}

// EnableLockOnBucket enables object locking on an existing bucket.
func (scenario *ObjectLockScenario) EnableLockOnBucket(ctx context.Context) {
	log.Println("\nA bucket can be configured to use object locking.")
	scenario.questioner.Ask("Press Enter to continue.")

	var err error
	bucket := scenario.resources.demoBuckets["retention-bucket"]
	err = scenario.s3Actions.EnableObjectLockOnBucket(ctx, bucket.name)
	if err != nil {
		switch err.(type) {
		case *types.NoSuchBucket:
			log.Printf("Couldn't enable object locking on bucket %s.\n", bucket.name)
		default:
			panic(err)
		}
	} else {
		log.Printf("Object locking enabled on bucket %s.", bucket.name)
	}

	log.Println(strings.Repeat("-", 88))
}

// SetDefaultRetentionPolicy sets a default retention governance policy on a bucket.
func (scenario *ObjectLockScenario) SetDefaultRetentionPolicy(ctx context.Context) {
	log.Println("\nA bucket can be configured to use object locking with a default retention period.")

	bucket := scenario.resources.demoBuckets["retention-bucket"]
	retentionPeriod := scenario.questioner.AskInt("Enter the default retention period in days: ")
	err := scenario.s3Actions.ModifyDefaultBucketRetention(ctx, bucket.name, types.ObjectLockEnabledEnabled, int32(retentionPeriod), types.ObjectLockRetentionModeGovernance)
	if err != nil {
		switch err.(type) {
		case *types.NoSuchBucket:
			log.Printf("Couldn't configure a default retention period on bucket %s.\n", bucket.name)
		default:
			panic(err)
		}
	} else {
		log.Printf("Default retention policy set on bucket %s with %d day retention period.", bucket.name, retentionPeriod)
		bucket.retentionEnabled = true
	}

	log.Println(strings.Repeat("-", 88))
}

// UploadTestObjects uploads test objects to the S3 buckets.
func (scenario *ObjectLockScenario) UploadTestObjects(ctx context.Context) {
	log.Println("Uploading test objects to S3 buckets.")

	for _, info := range createInfo {
		bucket := scenario.resources.demoBuckets[info.name]
		for i := 0; i < 2; i++ {
			key, err := scenario.s3Actions.UploadObject(ctx, bucket.name, fmt.Sprintf("example-%d", i),
				fmt.Sprintf("Example object content #%d in bucket %s.", i, bucket.name))
			if err != nil {
				switch err.(type) {
				case *types.NoSuchBucket:
					log.Printf("Couldn't upload %s to bucket %s.\n", key, bucket.name)
				default:
					panic(err)
				}
			} else {
				log.Printf("Uploaded %s to bucket %s.\n", key, bucket.name)
				bucket.objectKeys = append(bucket.objectKeys, key)
			}
		}
	}

	scenario.questioner.Ask("Test objects uploaded. Press Enter to continue.")
	log.Println(strings.Repeat("-", 88))
}

// SetObjectLockConfigurations sets object lock configurations on the test objects.
func (scenario *ObjectLockScenario) SetObjectLockConfigurations(ctx context.Context) {
	log.Println("Now let's set object lock configurations on individual objects.")

	buckets := []*DemoBucket{scenario.resources.demoBuckets["lock-bucket"], scenario.resources.demoBuckets["retention-bucket"]}
	for _, bucket := range buckets {
		for index, objKey := range bucket.objectKeys {
			switch index {
			case 0:
				if scenario.questioner.AskBool(fmt.Sprintf("\nDo you want to add a legal hold to %s in %s (y/n)? ", objKey, bucket.name), "y") {
					err := scenario.s3Actions.PutObjectLegalHold(ctx, bucket.name, objKey, "", types.ObjectLockLegalHoldStatusOn)
					if err != nil {
						switch err.(type) {
						case *types.NoSuchKey:
							log.Printf("Couldn't set legal hold on %s.\n", objKey)
						default:
							panic(err)
						}
					} else {
						log.Printf("Legal hold set on %s.\n", objKey)
					}
				}
			case 1:
				q := fmt.Sprintf("\nDo you want to add a 1 day Governance retention period to %s in %s?\n"+
					"Reminder: Only a user with the s3:BypassGovernanceRetention permission is able to delete this object\n"+
					"or its bucket until the retention period has expired. (y/n) ", objKey, bucket.name)
				if scenario.questioner.AskBool(q, "y") {
					err := scenario.s3Actions.PutObjectRetention(ctx, bucket.name, objKey, types.ObjectLockRetentionModeGovernance, 1)
					if err != nil {
						switch err.(type) {
						case *types.NoSuchKey:
							log.Printf("Couldn't set retention period on %s in %s.\n", objKey, bucket.name)
						default:
							panic(err)
						}
					} else {
						log.Printf("Retention period set to 1 for %s.", objKey)
						bucket.retentionEnabled = true
					}
				}
			}
		}
	}
	log.Println(strings.Repeat("-", 88))
}

const (
	ListAll = iota
	DeleteObject
	DeleteRetentionObject
	OverwriteObject
	ViewRetention
	ViewLegalHold
	Finish
)

// InteractWithObjects allows the user to interact with the objects and test the object lock configurations.
func (scenario *ObjectLockScenario) InteractWithObjects(ctx context.Context) {
	log.Println("Now you can interact with the objects to explore the object lock configurations.")
	interactiveChoices := []string{
		"List all objects and buckets.",
		"Attempt to delete an object.",
		"Attempt to delete an object with retention period bypass.",
		"Attempt to overwrite a file.",
		"View the retention settings for an object.",
		"View the legal hold settings for an object.",
		"Finish the workflow."}

	choice := ListAll
	for choice != Finish {
		objList := scenario.GetAllObjects(ctx)
		objChoices := scenario.makeObjectChoiceList(objList)
		choice = scenario.questioner.AskChoice("Choose an action from the menu:\n", interactiveChoices)
		switch choice {
		case ListAll:
			log.Println("The current objects in the example buckets are:")
			for _, objChoice := range objChoices {
				log.Println("\t", objChoice)
			}
		case DeleteObject, DeleteRetentionObject:
			objChoice := scenario.questioner.AskChoice("Enter the number of the object to delete:\n", objChoices)
			obj := objList[objChoice]
			deleted, err := scenario.s3Actions.DeleteObject(ctx, obj.bucket, obj.key, obj.versionId, choice == DeleteRetentionObject)
			if err != nil {
				switch err.(type) {
				case *types.NoSuchKey:
					log.Println("Nothing to delete.")
				default:
					panic(err)
				}
			} else if deleted {
				log.Printf("Object %s deleted.\n", obj.key)
			}
		case OverwriteObject:
			objChoice := scenario.questioner.AskChoice("Enter the number of the object to overwrite:\n", objChoices)
			obj := objList[objChoice]
			_, err := scenario.s3Actions.UploadObject(ctx, obj.bucket, obj.key, fmt.Sprintf("New content in object %s.", obj.key))
			if err != nil {
				switch err.(type) {
				case *types.NoSuchBucket:
					log.Println("Couldn't upload to nonexistent bucket.")
				default:
					panic(err)
				}
			} else {
				log.Printf("Uploaded new content to object %s.\n", obj.key)
			}
		case ViewRetention:
			objChoice := scenario.questioner.AskChoice("Enter the number of the object to view:\n", objChoices)
			obj := objList[objChoice]
			retention, err := scenario.s3Actions.GetObjectRetention(ctx, obj.bucket, obj.key)
			if err != nil {
				switch err.(type) {
				case *types.NoSuchKey:
					log.Printf("Can't get retention configuration for %s.\n", obj.key)
				default:
					panic(err)
				}
			} else if retention != nil {
				log.Printf("Object %s has retention mode %s until %v.\n", obj.key, retention.Mode, retention.RetainUntilDate)
			} else {
				log.Printf("Object %s does not have object retention configured.\n", obj.key)
			}
		case ViewLegalHold:
			objChoice := scenario.questioner.AskChoice("Enter the number of the object to view:\n", objChoices)
			obj := objList[objChoice]
			legalHold, err := scenario.s3Actions.GetObjectLegalHold(ctx, obj.bucket, obj.key, obj.versionId)
			if err != nil {
				switch err.(type) {
				case *types.NoSuchKey:
					log.Printf("Can't get legal hold configuration for %s.\n", obj.key)
				default:
					panic(err)
				}
			} else if legalHold != nil {
				log.Printf("Object %s has legal hold %v.", obj.key, *legalHold)
			} else {
				log.Printf("Object %s does not have legal hold configured.", obj.key)
			}
		case Finish:
			log.Println("Let's clean up.")
		}
		log.Println(strings.Repeat("-", 88))
	}
}

type BucketKeyVersionId struct {
	bucket    string
	key       string
	versionId string
}

// GetAllObjects gets the object versions in the example S3 buckets and returns them in a flattened list.
func (scenario *ObjectLockScenario) GetAllObjects(ctx context.Context) []BucketKeyVersionId {
	var objectList []BucketKeyVersionId
	for _, info := range createInfo {
		bucket := scenario.resources.demoBuckets[info.name]
		versions, err := scenario.s3Actions.ListObjectVersions(ctx, bucket.name)
		if err != nil {
			switch err.(type) {
			case *types.NoSuchBucket:
				log.Printf("Couldn't get object versions for %s.\n", bucket.name)
			default:
				panic(err)
			}
		} else {
			for _, version := range versions {
				objectList = append(objectList,
					BucketKeyVersionId{bucket: bucket.name, key: *version.Key, versionId: *version.VersionId})
			}
		}
	}
	return objectList
}

// makeObjectChoiceList makes the object version list into a list of strings that are displayed
// as choices.
func (scenario *ObjectLockScenario) makeObjectChoiceList(bucketObjects []BucketKeyVersionId) []string {
	choices := make([]string, len(bucketObjects))
	for i := 0; i < len(bucketObjects); i++ {
		choices[i] = fmt.Sprintf("%s in %s with VersionId %s.",
			bucketObjects[i].key, bucketObjects[i].bucket, bucketObjects[i].versionId)
	}
	return choices
}

// Run runs the S3 Object Lock scenario.
func (scenario *ObjectLockScenario) Run(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			_, isMock := scenario.questioner.(*demotools.MockQuestioner)
			if isMock || scenario.questioner.AskBool("Do you want to see the full error message (y/n)?", "y") {
				log.Println(r)
			}
			scenario.resources.Cleanup(ctx)
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon S3 Object Lock Feature Scenario.")
	log.Println(strings.Repeat("-", 88))

	scenario.CreateBuckets(ctx)
	scenario.EnableLockOnBucket(ctx)
	scenario.SetDefaultRetentionPolicy(ctx)
	scenario.UploadTestObjects(ctx)
	scenario.SetObjectLockConfigurations(ctx)
	scenario.InteractWithObjects(ctx)

	scenario.resources.Cleanup(ctx)

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 S3 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// S3Actions wraps S3 service actions.
type S3Actions struct {
	S3Client  *s3.Client
	S3Manager *manager.Uploader
}



// CreateBucketWithLock creates a new S3 bucket with optional object locking enabled
// and waits for the bucket to exist before returning.
func (actor S3Actions) CreateBucketWithLock(ctx context.Context, bucket string, region string, enableObjectLock bool) (string, error) {
	input := &s3.CreateBucketInput{
		Bucket: aws.String(bucket),
		CreateBucketConfiguration: &types.CreateBucketConfiguration{
			LocationConstraint: types.BucketLocationConstraint(region),
		},
	}

	if enableObjectLock {
		input.ObjectLockEnabledForBucket = aws.Bool(true)
	}

	_, err := actor.S3Client.CreateBucket(ctx, input)
	if err != nil {
		var owned *types.BucketAlreadyOwnedByYou
		var exists *types.BucketAlreadyExists
		if errors.As(err, &owned) {
			log.Printf("You already own bucket %s.\n", bucket)
			err = owned
		} else if errors.As(err, &exists) {
			log.Printf("Bucket %s already exists.\n", bucket)
			err = exists
		}
	} else {
		err = s3.NewBucketExistsWaiter(actor.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(bucket)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to exist.\n", bucket)
		}
	}

	return bucket, err
}



// GetObjectLegalHold retrieves the legal hold status for an S3 object.
func (actor S3Actions) GetObjectLegalHold(ctx context.Context, bucket string, key string, versionId string) (*types.ObjectLockLegalHoldStatus, error) {
	var status *types.ObjectLockLegalHoldStatus
	input := &s3.GetObjectLegalHoldInput{
		Bucket:    aws.String(bucket),
		Key:       aws.String(key),
		VersionId: aws.String(versionId),
	}

	output, err := actor.S3Client.GetObjectLegalHold(ctx, input)
	if err != nil {
		var noSuchKeyErr *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noSuchKeyErr) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noSuchKeyErr
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "NoSuchObjectLockConfiguration":
				log.Printf("Object %s does not have an object lock configuration.\n", key)
				err = nil
			case "InvalidRequest":
				log.Printf("Bucket %s does not have an object lock configuration.\n", bucket)
				err = nil
			}
		}
	} else {
		status = &output.LegalHold.Status
	}

	return status, err
}



// GetObjectLockConfiguration retrieves the object lock configuration for an S3 bucket.
func (actor S3Actions) GetObjectLockConfiguration(ctx context.Context, bucket string) (*types.ObjectLockConfiguration, error) {
	var lockConfig *types.ObjectLockConfiguration
	input := &s3.GetObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
	}

	output, err := actor.S3Client.GetObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		} else if errors.As(err, &apiErr) && apiErr.ErrorCode() == "ObjectLockConfigurationNotFoundError" {
			log.Printf("Bucket %s does not have an object lock configuration.\n", bucket)
			err = nil
		}
	} else {
		lockConfig = output.ObjectLockConfiguration
	}

	return lockConfig, err
}



// GetObjectRetention retrieves the object retention configuration for an S3 object.
func (actor S3Actions) GetObjectRetention(ctx context.Context, bucket string, key string) (*types.ObjectLockRetention, error) {
	var retention *types.ObjectLockRetention
	input := &s3.GetObjectRetentionInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
	}

	output, err := actor.S3Client.GetObjectRetention(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "NoSuchObjectLockConfiguration":
				err = nil
			case "InvalidRequest":
				log.Printf("Bucket %s does not have locking enabled.", bucket)
				err = nil
			}
		}
	} else {
		retention = output.Retention
	}

	return retention, err
}



// PutObjectLegalHold sets the legal hold configuration for an S3 object.
func (actor S3Actions) PutObjectLegalHold(ctx context.Context, bucket string, key string, versionId string, legalHoldStatus types.ObjectLockLegalHoldStatus) error {
	input := &s3.PutObjectLegalHoldInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
		LegalHold: &types.ObjectLockLegalHold{
			Status: legalHoldStatus,
		},
	}
	if versionId != "" {
		input.VersionId = aws.String(versionId)
	}

	_, err := actor.S3Client.PutObjectLegalHold(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		}
	}

	return err
}



// ModifyDefaultBucketRetention modifies the default retention period of an existing bucket.
func (actor S3Actions) ModifyDefaultBucketRetention(
	ctx context.Context, bucket string, lockMode types.ObjectLockEnabled, retentionPeriod int32, retentionMode types.ObjectLockRetentionMode) error {

	input := &s3.PutObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
		ObjectLockConfiguration: &types.ObjectLockConfiguration{
			ObjectLockEnabled: lockMode,
			Rule: &types.ObjectLockRule{
				DefaultRetention: &types.DefaultRetention{
					Days: aws.Int32(retentionPeriod),
					Mode: retentionMode,
				},
			},
		},
	}
	_, err := actor.S3Client.PutObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	}

	return err
}



// EnableObjectLockOnBucket enables object locking on an existing bucket.
func (actor S3Actions) EnableObjectLockOnBucket(ctx context.Context, bucket string) error {
	// Versioning must be enabled on the bucket before object locking is enabled.
	verInput := &s3.PutBucketVersioningInput{
		Bucket: aws.String(bucket),
		VersioningConfiguration: &types.VersioningConfiguration{
			MFADelete: types.MFADeleteDisabled,
			Status:    types.BucketVersioningStatusEnabled,
		},
	}
	_, err := actor.S3Client.PutBucketVersioning(ctx, verInput)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
		return err
	}

	input := &s3.PutObjectLockConfigurationInput{
		Bucket: aws.String(bucket),
		ObjectLockConfiguration: &types.ObjectLockConfiguration{
			ObjectLockEnabled: types.ObjectLockEnabledEnabled,
		},
	}
	_, err = actor.S3Client.PutObjectLockConfiguration(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	}

	return err
}



// PutObjectRetention sets the object retention configuration for an S3 object.
func (actor S3Actions) PutObjectRetention(ctx context.Context, bucket string, key string, retentionMode types.ObjectLockRetentionMode, retentionPeriodDays int32) error {
	input := &s3.PutObjectRetentionInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
		Retention: &types.ObjectLockRetention{
			Mode:            retentionMode,
			RetainUntilDate: aws.Time(time.Now().AddDate(0, 0, int(retentionPeriodDays))),
		},
		BypassGovernanceRetention: aws.Bool(true),
	}

	_, err := actor.S3Client.PutObjectRetention(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in bucket %s.\n", key, bucket)
			err = noKey
		}
	}

	return err
}



// UploadObject uses the S3 upload manager to upload an object to a bucket.
func (actor S3Actions) UploadObject(ctx context.Context, bucket string, key string, contents string) (string, error) {
	var outKey string
	input := &s3.PutObjectInput{
		Bucket:            aws.String(bucket),
		Key:               aws.String(key),
		Body:              bytes.NewReader([]byte(contents)),
		ChecksumAlgorithm: types.ChecksumAlgorithmSha256,
	}
	output, err := actor.S3Manager.Upload(ctx, input)
	if err != nil {
		var noBucket *types.NoSuchBucket
		if errors.As(err, &noBucket) {
			log.Printf("Bucket %s does not exist.\n", bucket)
			err = noBucket
		}
	} else {
		err := s3.NewObjectExistsWaiter(actor.S3Client).Wait(ctx, &s3.HeadObjectInput{
			Bucket: aws.String(bucket),
			Key:    aws.String(key),
		}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist in %s.\n", key, bucket)
		} else {
			outKey = *output.Key
		}
	}
	return outKey, err
}



// ListObjectVersions lists all versions of all objects in a bucket.
func (actor S3Actions) ListObjectVersions(ctx context.Context, bucket string) ([]types.ObjectVersion, error) {
	var err error
	var output *s3.ListObjectVersionsOutput
	var versions []types.ObjectVersion
	input := &s3.ListObjectVersionsInput{Bucket: aws.String(bucket)}
	versionPaginator := s3.NewListObjectVersionsPaginator(actor.S3Client, input)
	for versionPaginator.HasMorePages() {
		output, err = versionPaginator.NextPage(ctx)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucket)
				err = noBucket
			}
			break
		} else {
			versions = append(versions, output.Versions...)
		}
	}
	return versions, err
}



// DeleteObject deletes an object from a bucket.
func (actor S3Actions) DeleteObject(ctx context.Context, bucket string, key string, versionId string, bypassGovernance bool) (bool, error) {
	deleted := false
	input := &s3.DeleteObjectInput{
		Bucket: aws.String(bucket),
		Key:    aws.String(key),
	}
	if versionId != "" {
		input.VersionId = aws.String(versionId)
	}
	if bypassGovernance {
		input.BypassGovernanceRetention = aws.Bool(true)
	}
	_, err := actor.S3Client.DeleteObject(ctx, input)
	if err != nil {
		var noKey *types.NoSuchKey
		var apiErr *smithy.GenericAPIError
		if errors.As(err, &noKey) {
			log.Printf("Object %s does not exist in %s.\n", key, bucket)
			err = noKey
		} else if errors.As(err, &apiErr) {
			switch apiErr.ErrorCode() {
			case "AccessDenied":
				log.Printf("Access denied: cannot delete object %s from %s.\n", key, bucket)
				err = nil
			case "InvalidArgument":
				if bypassGovernance {
					log.Printf("You cannot specify bypass governance on a bucket without lock enabled.")
					err = nil
				}
			}
		}
	} else {
		err = s3.NewObjectNotExistsWaiter(actor.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(bucket), Key: aws.String(key)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s in bucket %s to be deleted.\n", key, bucket)
		} else {
			deleted = true
		}
	}
	return deleted, err
}



// DeleteObjects deletes a list of objects from a bucket.
func (actor S3Actions) DeleteObjects(ctx context.Context, bucket string, objects []types.ObjectIdentifier, bypassGovernance bool) error {
	if len(objects) == 0 {
		return nil
	}

	input := s3.DeleteObjectsInput{
		Bucket: aws.String(bucket),
		Delete: &types.Delete{
			Objects: objects,
			Quiet:   aws.Bool(true),
		},
	}
	if bypassGovernance {
		input.BypassGovernanceRetention = aws.Bool(true)
	}
	delOut, err := actor.S3Client.DeleteObjects(ctx, &input)
	if err != nil || len(delOut.Errors) > 0 {
		log.Printf("Error deleting objects from bucket %s.\n", bucket)
		if err != nil {
			var noBucket *types.NoSuchBucket
			if errors.As(err, &noBucket) {
				log.Printf("Bucket %s does not exist.\n", bucket)
				err = noBucket
			}
		} else if len(delOut.Errors) > 0 {
			for _, outErr := range delOut.Errors {
				log.Printf("%s: %s\n", *outErr.Key, *outErr.Message)
			}
			err = fmt.Errorf("%s", *delOut.Errors[0].Message)
		}
	} else {
		for _, delObjs := range delOut.Deleted {
			err = s3.NewObjectNotExistsWaiter(actor.S3Client).Wait(
				ctx, &s3.HeadObjectInput{Bucket: aws.String(bucket), Key: delObjs.Key}, time.Minute)
			if err != nil {
				log.Printf("Failed attempt to wait for object %s to be deleted.\n", *delObjs.Key)
			} else {
				log.Printf("Deleted %s.\n", *delObjs.Key)
			}
		}
	}
	return err
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"log"
	"s3_object_lock/actions"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

// DemoBucket contains metadata for buckets used in this example.
type DemoBucket struct {
	name             string
	retentionEnabled bool
	objectKeys       []string
}

// Resources keeps track of AWS resources created during the ObjectLockScenario and handles
// cleanup when the scenario finishes.
type Resources struct {
	demoBuckets map[string]*DemoBucket

	s3Actions  *actions.S3Actions
	questioner demotools.IQuestioner
}

// init initializes objects in the Resources struct.
func (resources *Resources) init(s3Actions *actions.S3Actions, questioner demotools.IQuestioner) {
	resources.s3Actions = s3Actions
	resources.questioner = questioner
	resources.demoBuckets = map[string]*DemoBucket{}
}

// Cleanup deletes all AWS resources created during the ObjectLockScenario.
func (resources *Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Something went wrong during cleanup.\n%v\n", r)
			log.Println("Use the AWS Management Console to remove any remaining resources " +
				"that were created for this scenario.")
		}
	}()

	wantDelete := resources.questioner.AskBool("Do you want to remove all of the AWS resources that were created "+
		"during this demo (y/n)?", "y")
	if !wantDelete {
		log.Println("Be sure to remove resources when you're done with them to avoid unexpected charges!")
		return
	}

	log.Println("Removing objects from S3 buckets and deleting buckets...")
	resources.deleteBuckets(ctx)
	//resources.deleteRetentionObjects(resources.retentionBucket, resources.retentionObjects)

	log.Println("Cleanup complete.")
}

// deleteBuckets empties and then deletes all buckets created during the ObjectLockScenario.
func (resources *Resources) deleteBuckets(ctx context.Context) {
	for _, info := range createInfo {
		bucket := resources.demoBuckets[info.name]
		resources.deleteObjects(ctx, bucket)
		_, err := resources.s3Actions.S3Client.DeleteBucket(ctx, &s3.DeleteBucketInput{
			Bucket: aws.String(bucket.name),
		})
		if err != nil {
			panic(err)
		}
	}
	for _, info := range createInfo {
		bucket := resources.demoBuckets[info.name]
		err := s3.NewBucketNotExistsWaiter(resources.s3Actions.S3Client).Wait(
			ctx, &s3.HeadBucketInput{Bucket: aws.String(bucket.name)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for bucket %s to be deleted.\n", bucket.name)
		} else {
			log.Printf("Deleted %s.\n", bucket.name)
		}
	}
	resources.demoBuckets = map[string]*DemoBucket{}
}

// deleteObjects deletes all objects in the specified bucket.
func (resources *Resources) deleteObjects(ctx context.Context, bucket *DemoBucket) {
	lockConfig, err := resources.s3Actions.GetObjectLockConfiguration(ctx, bucket.name)
	if err != nil {
		panic(err)
	}
	versions, err := resources.s3Actions.ListObjectVersions(ctx, bucket.name)
	if err != nil {
		switch err.(type) {
		case *types.NoSuchBucket:
			log.Printf("No objects to get from %s.\n", bucket.name)
		default:
			panic(err)
		}
	}
	delObjects := make([]types.ObjectIdentifier, len(versions))
	for i, version := range versions {
		if lockConfig != nil && lockConfig.ObjectLockEnabled == types.ObjectLockEnabledEnabled {
			status, err := resources.s3Actions.GetObjectLegalHold(ctx, bucket.name, *version.Key, *version.VersionId)
			if err != nil {
				switch err.(type) {
				case *types.NoSuchKey:
					log.Printf("Couldn't determine legal hold status for %s in %s.\n", *version.Key, bucket.name)
				default:
					panic(err)
				}
			} else if status != nil && *status == types.ObjectLockLegalHoldStatusOn {
				err = resources.s3Actions.PutObjectLegalHold(ctx, bucket.name, *version.Key, *version.VersionId, types.ObjectLockLegalHoldStatusOff)
				if err != nil {
					switch err.(type) {
					case *types.NoSuchKey:
						log.Printf("Couldn't turn off legal hold for %s in %s.\n", *version.Key, bucket.name)
					default:
						panic(err)
					}
				}
			}
		}
		delObjects[i] = types.ObjectIdentifier{Key: version.Key, VersionId: version.VersionId}
	}
	err = resources.s3Actions.DeleteObjects(ctx, bucket.name, delObjects, bucket.retentionEnabled)
	if err != nil {
		switch err.(type) {
		case *types.NoSuchBucket:
			log.Println("Nothing to delete.")
		default:
			panic(err)
		}
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [GetObjectLegalHold](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectLegalHold)
  + [GetObjectLockConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectLockConfiguration)
  + [GetObjectRetention](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.GetObjectRetention)
  + [PutObjectLegalHold](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectLegalHold)
  + [PutObjectLockConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectLockConfiguration)
  + [PutObjectRetention](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#Client.PutObjectRetention)

### 대용량 파일 업로드 또는 다운로드
<a name="s3_Scenario_UsingLargeFiles_go_2_topic"></a>

다음 코드 예제는 Amazon S3에 대용량 파일을 업로드하고 Amazon S3에서 대용량 파일을 다운로드하는 방법을 보여줍니다.

자세한 내용은 [멀티파트 업로드를 사용하여 객체 업로드](https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpu-upload-object.html)를 참조하세요.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/s3#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
업로드 및 다운로드 관리자를 사용하여 데이터를 여러 부분으로 나누고 동시에 전송하는 함수를 생성합니다.  

```
import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"log"
	"os"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/aws-sdk-go-v2/service/s3/types"
	"github.com/aws/smithy-go"
)

// BucketBasics encapsulates the Amazon Simple Storage Service (Amazon S3) actions
// used in the examples.
// It contains S3Client, an Amazon S3 service client that is used to perform bucket
// and object actions.
type BucketBasics struct {
	S3Client *s3.Client
}



// UploadLargeObject uses an upload manager to upload data to an object in a bucket.
// The upload manager breaks large data into parts and uploads the parts concurrently.
func (basics BucketBasics) UploadLargeObject(ctx context.Context, bucketName string, objectKey string, largeObject []byte) error {
	largeBuffer := bytes.NewReader(largeObject)
	var partMiBs int64 = 10
	uploader := manager.NewUploader(basics.S3Client, func(u *manager.Uploader) {
		u.PartSize = partMiBs * 1024 * 1024
	})
	_, err := uploader.Upload(ctx, &s3.PutObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
		Body:   largeBuffer,
	})
	if err != nil {
		var apiErr smithy.APIError
		if errors.As(err, &apiErr) && apiErr.ErrorCode() == "EntityTooLarge" {
			log.Printf("Error while uploading object to %s. The object is too large.\n"+
				"The maximum size for a multipart upload is 5TB.", bucketName)
		} else {
			log.Printf("Couldn't upload large object to %v:%v. Here's why: %v\n",
				bucketName, objectKey, err)
		}
	} else {
		err = s3.NewObjectExistsWaiter(basics.S3Client).Wait(
			ctx, &s3.HeadObjectInput{Bucket: aws.String(bucketName), Key: aws.String(objectKey)}, time.Minute)
		if err != nil {
			log.Printf("Failed attempt to wait for object %s to exist.\n", objectKey)
		}
	}

	return err
}



// DownloadLargeObject uses a download manager to download an object from a bucket.
// The download manager gets the data in parts and writes them to a buffer until all of
// the data has been downloaded.
func (basics BucketBasics) DownloadLargeObject(ctx context.Context, bucketName string, objectKey string) ([]byte, error) {
	var partMiBs int64 = 10
	downloader := manager.NewDownloader(basics.S3Client, func(d *manager.Downloader) {
		d.PartSize = partMiBs * 1024 * 1024
	})
	buffer := manager.NewWriteAtBuffer([]byte{})
	_, err := downloader.Download(ctx, buffer, &s3.GetObjectInput{
		Bucket: aws.String(bucketName),
		Key:    aws.String(objectKey),
	})
	if err != nil {
		log.Printf("Couldn't download large object from %v:%v. Here's why: %v\n",
			bucketName, objectKey, err)
	}
	return buffer.Bytes(), err
}
```
컨텍스트에서 업로드 및 다운로드 관리자를 사용하는 방법을 보여주는 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"crypto/rand"
	"log"
	"strings"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/s3/actions"
)

// RunLargeObjectScenario is an interactive example that shows you how to use Amazon
// Simple Storage Service (Amazon S3) to upload and download large objects.
//
// 1. Create a bucket.
// 3. Upload a large object to the bucket by using an upload manager.
// 5. Download a large object by using a download manager.
// 8. Delete all objects in the bucket.
// 9. Delete the bucket.
//
// This example creates an Amazon S3 service client from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
func RunLargeObjectScenario(ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner) {
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.")
			_, isMock := questioner.(*demotools.MockQuestioner)
			if isMock || questioner.AskBool("Do you want to see the full error message (y/n)?", "y") {
				log.Println(r)
			}
		}
	}()

	log.Println(strings.Repeat("-", 88))
	log.Println("Welcome to the Amazon S3 large object demo.")
	log.Println(strings.Repeat("-", 88))

	s3Client := s3.NewFromConfig(sdkConfig)
	bucketBasics := actions.BucketBasics{S3Client: s3Client}

	bucketName := questioner.Ask("Let's create a bucket. Enter a name for your bucket:",
		demotools.NotEmpty{})
	bucketExists, err := bucketBasics.BucketExists(ctx, bucketName)
	if err != nil {
		panic(err)
	}
	if !bucketExists {
		err = bucketBasics.CreateBucket(ctx, bucketName, sdkConfig.Region)
		if err != nil {
			panic(err)
		} else {
			log.Println("Bucket created.")
		}
	}
	log.Println(strings.Repeat("-", 88))

	mibs := 30
	log.Printf("Let's create a slice of %v MiB of random bytes and upload it to your bucket. ", mibs)
	questioner.Ask("Press Enter when you're ready.")
	largeBytes := make([]byte, 1024*1024*mibs)
	_, _ = rand.Read(largeBytes)
	largeKey := "doc-example-large"
	log.Println("Uploading...")
	err = bucketBasics.UploadLargeObject(ctx, bucketName, largeKey, largeBytes)
	if err != nil {
		panic(err)
	}
	log.Printf("Uploaded %v MiB object as %v", mibs, largeKey)
	log.Println(strings.Repeat("-", 88))

	log.Printf("Let's download the %v MiB object.", mibs)
	questioner.Ask("Press Enter when you're ready.")
	log.Println("Downloading...")
	largeDownload, err := bucketBasics.DownloadLargeObject(ctx, bucketName, largeKey)
	if err != nil {
		panic(err)
	}
	log.Printf("Downloaded %v bytes.", len(largeDownload))
	log.Println(strings.Repeat("-", 88))

	if questioner.AskBool("Do you want to delete your bucket and all of its "+
		"contents? (y/n)", "y") {
		log.Println("Deleting object.")
		err = bucketBasics.DeleteObjects(ctx, bucketName, []string{largeKey})
		if err != nil {
			panic(err)
		}
		log.Println("Deleting bucket.")
		err = bucketBasics.DeleteBucket(ctx, bucketName)
		if err != nil {
			panic(err)
		}
	} else {
		log.Println("Okay. Don't forget to delete objects from your bucket to avoid charges.")
	}
	log.Println(strings.Repeat("-", 88))

	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```

## 서버리스 예제
<a name="serverless_examples"></a>

### Amazon S3 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_S3_Lambda_go_2_topic"></a>

다음 코드 예제는 S3 버킷에 객체를 업로드하여 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 해당 함수는 이벤트 파라미터에서 S3 버킷 이름과 객체 키를 검색하고 Amazon S3 API를 호출하여 객체의 콘텐츠 유형을 검색하고 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-s3-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 S3 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"log"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/s3"
)

func handler(ctx context.Context, s3Event events.S3Event) error {
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		log.Printf("failed to load default config: %s", err)
		return err
	}
	s3Client := s3.NewFromConfig(sdkConfig)

	for _, record := range s3Event.Records {
		bucket := record.S3.Bucket.Name
		key := record.S3.Object.URLDecodedKey
		headOutput, err := s3Client.HeadObject(ctx, &s3.HeadObjectInput{
			Bucket: &bucket,
			Key:    &key,
		})
		if err != nil {
			log.Printf("error getting head of object %s/%s: %s", bucket, key, err)
			return err
		}
		log.Printf("successfully retrieved %s/%s of type %s", bucket, key, *headOutput.ContentType)
	}

	return nil
}

func main() {
	lambda.Start(handler)
}
```

# SDK for Go V2를 사용한 Amazon SNS 예제
<a name="go_2_sns_code_examples"></a>

다음 코드 예제에서는 Amazon SNS에서 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [작업](#actions)
+ [시나리오](#scenarios)
+ [서버리스 예제](#serverless_examples)

## 시작하기
<a name="get_started"></a>

### Hello Amazon SNS
<a name="sns_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon SNS 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/sns#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Notification Service
// (Amazon SNS) client and list the topics in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	snsClient := sns.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the topics for your account.")
	var topics []types.Topic
	paginator := sns.NewListTopicsPaginator(snsClient, &sns.ListTopicsInput{})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get topics. Here's why: %v\n", err)
			break
		} else {
			topics = append(topics, output.Topics...)
		}
	}
	if len(topics) == 0 {
		fmt.Println("You don't have any topics!")
	} else {
		for _, topic := range topics {
			fmt.Printf("\t%v\n", *topic.TopicArn)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListTopics](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.ListTopics)를 참조하세요.

## 작업
<a name="actions"></a>

### `CreateTopic`
<a name="sns_CreateTopic_go_2_topic"></a>

다음 코드 예시는 `CreateTopic`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// CreateTopic creates an Amazon SNS topic with the specified name. You can optionally
// specify that the topic is created as a FIFO topic and whether it uses content-based
// deduplication instead of ID-based deduplication.
func (actor SnsActions) CreateTopic(ctx context.Context, topicName string, isFifoTopic bool, contentBasedDeduplication bool) (string, error) {
	var topicArn string
	topicAttributes := map[string]string{}
	if isFifoTopic {
		topicAttributes["FifoTopic"] = "true"
	}
	if contentBasedDeduplication {
		topicAttributes["ContentBasedDeduplication"] = "true"
	}
	topic, err := actor.SnsClient.CreateTopic(ctx, &sns.CreateTopicInput{
		Name:       aws.String(topicName),
		Attributes: topicAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create topic %v. Here's why: %v\n", topicName, err)
	} else {
		topicArn = *topic.TopicArn
	}

	return topicArn, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.CreateTopic)을 참조하세요.

### `DeleteTopic`
<a name="sns_DeleteTopic_go_2_topic"></a>

다음 코드 예시는 `DeleteTopic`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// DeleteTopic delete an Amazon SNS topic.
func (actor SnsActions) DeleteTopic(ctx context.Context, topicArn string) error {
	_, err := actor.SnsClient.DeleteTopic(ctx, &sns.DeleteTopicInput{
		TopicArn: aws.String(topicArn)})
	if err != nil {
		log.Printf("Couldn't delete topic %v. Here's why: %v\n", topicArn, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.DeleteTopic)을 참조하세요.

### `ListTopics`
<a name="sns_ListTopics_go_2_topic"></a>

다음 코드 예시는 `ListTopics`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/sns#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Notification Service
// (Amazon SNS) client and list the topics in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	snsClient := sns.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the topics for your account.")
	var topics []types.Topic
	paginator := sns.NewListTopicsPaginator(snsClient, &sns.ListTopicsInput{})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get topics. Here's why: %v\n", err)
			break
		} else {
			topics = append(topics, output.Topics...)
		}
	}
	if len(topics) == 0 {
		fmt.Println("You don't have any topics!")
	} else {
		for _, topic := range topics {
			fmt.Printf("\t%v\n", *topic.TopicArn)
		}
	}
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ListTopics](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.ListTopics)를 참조하세요.

### `Publish`
<a name="sns_Publish_go_2_topic"></a>

다음 코드 예시는 `Publish`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// Publish publishes a message to an Amazon SNS topic. The message is then sent to all
// subscribers. When the topic is a FIFO topic, the message must also contain a group ID
// and, when ID-based deduplication is used, a deduplication ID. An optional key-value
// filter attribute can be specified so that the message can be filtered according to
// a filter policy.
func (actor SnsActions) Publish(ctx context.Context, topicArn string, message string, groupId string, dedupId string, filterKey string, filterValue string) error {
	publishInput := sns.PublishInput{TopicArn: aws.String(topicArn), Message: aws.String(message)}
	if groupId != "" {
		publishInput.MessageGroupId = aws.String(groupId)
	}
	if dedupId != "" {
		publishInput.MessageDeduplicationId = aws.String(dedupId)
	}
	if filterKey != "" && filterValue != "" {
		publishInput.MessageAttributes = map[string]types.MessageAttributeValue{
			filterKey: {DataType: aws.String("String"), StringValue: aws.String(filterValue)},
		}
	}
	_, err := actor.SnsClient.Publish(ctx, &publishInput)
	if err != nil {
		log.Printf("Couldn't publish message to topic %v. Here's why: %v", topicArn, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [Publish](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Publish)를 참조하세요.

### `Subscribe`
<a name="sns_Subscribe_go_2_topic"></a>

다음 코드 예시는 `Subscribe`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
선택적 필터를 사용하여 주제 대기열을 구독하세요.  

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// SubscribeQueue subscribes an Amazon Simple Queue Service (Amazon SQS) queue to an
// Amazon SNS topic. When filterMap is not nil, it is used to specify a filter policy
// so that messages are only sent to the queue when the message has the specified attributes.
func (actor SnsActions) SubscribeQueue(ctx context.Context, topicArn string, queueArn string, filterMap map[string][]string) (string, error) {
	var subscriptionArn string
	var attributes map[string]string
	if filterMap != nil {
		filterBytes, err := json.Marshal(filterMap)
		if err != nil {
			log.Printf("Couldn't create filter policy, here's why: %v\n", err)
			return "", err
		}
		attributes = map[string]string{"FilterPolicy": string(filterBytes)}
	}
	output, err := actor.SnsClient.Subscribe(ctx, &sns.SubscribeInput{
		Protocol:              aws.String("sqs"),
		TopicArn:              aws.String(topicArn),
		Attributes:            attributes,
		Endpoint:              aws.String(queueArn),
		ReturnSubscriptionArn: true,
	})
	if err != nil {
		log.Printf("Couldn't susbscribe queue %v to topic %v. Here's why: %v\n",
			queueArn, topicArn, err)
	} else {
		subscriptionArn = *output.SubscriptionArn
	}

	return subscriptionArn, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [Subscribe](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Subscribe)를 참조하십시오.

## 시나리오
<a name="scenarios"></a>

### 대기열에 메시지 게시
<a name="sqs_Scenario_TopicsAndQueues_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 주제(FIFO 또는 비 FIFO)를 생성합니다.
+ 필터 적용 옵션을 사용하여 여러 개의 대기열로 주제를 구독합니다.
+ 주제에 메시지를 게시합니다.
+ 대기열에서 받은 메시지를 폴링합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"strings"
	"topics_and_queues/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

const FIFO_SUFFIX = ".fifo"
const TONE_KEY = "tone"

var ToneChoices = []string{"cheerful", "funny", "serious", "sincere"}

// MessageBody is used to deserialize the body of a message from a JSON string.
type MessageBody struct {
	Message string
}

// ScenarioRunner separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type ScenarioRunner struct {
	questioner demotools.IQuestioner
	snsActor   *actions.SnsActions
	sqsActor   *actions.SqsActions
}

func (runner ScenarioRunner) CreateTopic(ctx context.Context) (string, string, bool, bool) {
	log.Println("SNS topics can be configured as FIFO (First-In-First-Out) or standard.\n" +
		"FIFO topics deliver messages in order and support deduplication and message filtering.")
	isFifoTopic := runner.questioner.AskBool("\nWould you like to work with FIFO topics? (y/n) ", "y")

	contentBasedDeduplication := false
	if isFifoTopic {
		log.Println(strings.Repeat("-", 88))
		log.Println("Because you have chosen a FIFO topic, deduplication is supported.\n" +
			"Deduplication IDs are either set in the message or are automatically generated\n" +
			"from content using a hash function. If a message is successfully published to\n" +
			"an SNS FIFO topic, any message published and determined to have the same\n" +
			"deduplication ID, within the five-minute deduplication interval, is accepted\n" +
			"but not delivered. For more information about deduplication, see:\n" +
			"\thttps://docs.aws.amazon.com/sns/latest/dg/fifo-message-dedup.html.")
		contentBasedDeduplication = runner.questioner.AskBool(
			"\nDo you want to use content-based deduplication instead of entering a deduplication ID? (y/n) ", "y")
	}
	log.Println(strings.Repeat("-", 88))

	topicName := runner.questioner.Ask("Enter a name for your SNS topic. ")
	if isFifoTopic {
		topicName = fmt.Sprintf("%v%v", topicName, FIFO_SUFFIX)
		log.Printf("Because you have selected a FIFO topic, '%v' must be appended to\n"+
			"the topic name.", FIFO_SUFFIX)
	}

	topicArn, err := runner.snsActor.CreateTopic(ctx, topicName, isFifoTopic, contentBasedDeduplication)
	if err != nil {
		panic(err)
	}
	log.Printf("Your new topic with the name '%v' and Amazon Resource Name (ARN) \n"+
		"'%v' has been created.", topicName, topicArn)

	return topicName, topicArn, isFifoTopic, contentBasedDeduplication
}

func (runner ScenarioRunner) CreateQueue(ctx context.Context, ordinal string, isFifoTopic bool) (string, string) {
	queueName := runner.questioner.Ask(fmt.Sprintf("Enter a name for the %v SQS queue. ", ordinal))
	if isFifoTopic {
		queueName = fmt.Sprintf("%v%v", queueName, FIFO_SUFFIX)
		if ordinal == "first" {
			log.Printf("Because you are creating a FIFO SQS queue, '%v' must "+
				"be appended to the queue name.\n", FIFO_SUFFIX)
		}
	}
	queueUrl, err := runner.sqsActor.CreateQueue(ctx, queueName, isFifoTopic)
	if err != nil {
		panic(err)
	}
	log.Printf("Your new SQS queue with the name '%v' and the queue URL "+
		"'%v' has been created.", queueName, queueUrl)

	return queueName, queueUrl
}

func (runner ScenarioRunner) SubscribeQueueToTopic(
	ctx context.Context, queueName string, queueUrl string, topicName string, topicArn string, ordinal string,
	isFifoTopic bool) (string, bool) {

	queueArn, err := runner.sqsActor.GetQueueArn(ctx, queueUrl)
	if err != nil {
		panic(err)
	}
	log.Printf("The ARN of your queue is: %v.\n", queueArn)

	err = runner.sqsActor.AttachSendMessagePolicy(ctx, queueUrl, queueArn, topicArn)
	if err != nil {
		panic(err)
	}
	log.Println("Attached an IAM policy to the queue so the SNS topic can send " +
		"messages to it.")
	log.Println(strings.Repeat("-", 88))

	var filterPolicy map[string][]string
	if isFifoTopic {
		if ordinal == "first" {
			log.Println("Subscriptions to a FIFO topic can have filters.\n" +
				"If you add a filter to this subscription, then only the filtered messages\n" +
				"will be received in the queue.\n" +
				"For information about message filtering, see\n" +
				"\thttps://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html\n" +
				"For this example, you can filter messages by a \"tone\" attribute.")
		}

		wantFiltering := runner.questioner.AskBool(
			fmt.Sprintf("Do you want to filter messages that are sent to \"%v\"\n"+
				"from the %v topic? (y/n) ", queueName, topicName), "y")
		if wantFiltering {
			log.Println("You can filter messages by one or more of the following \"tone\" attributes.")

			var toneSelections []string
			askAboutTones := true
			for askAboutTones {
				toneIndex := runner.questioner.AskChoice(
					"Enter the number of the tone you want to filter by:\n", ToneChoices)
				toneSelections = append(toneSelections, ToneChoices[toneIndex])
				askAboutTones = runner.questioner.AskBool("Do you want to add another tone to the filter? (y/n) ", "y")
			}
			log.Printf("Your subscription will be filtered to only pass the following tones: %v\n", toneSelections)
			filterPolicy = map[string][]string{TONE_KEY: toneSelections}
		}
	}

	subscriptionArn, err := runner.snsActor.SubscribeQueue(ctx, topicArn, queueArn, filterPolicy)
	if err != nil {
		panic(err)
	}
	log.Printf("The queue %v is now subscribed to the topic %v with the subscription ARN %v.\n",
		queueName, topicName, subscriptionArn)

	return subscriptionArn, filterPolicy != nil
}

func (runner ScenarioRunner) PublishMessages(ctx context.Context, topicArn string, isFifoTopic bool, contentBasedDeduplication bool, usingFilters bool) {
	var message string
	var groupId string
	var dedupId string
	var toneSelection string
	publishMore := true
	for publishMore {
		groupId = ""
		dedupId = ""
		toneSelection = ""
		message = runner.questioner.Ask("Enter a message to publish: ")
		if isFifoTopic {
			log.Println("Because you are using a FIFO topic, you must set a message group ID.\n" +
				"All messages within the same group will be received in the order they were published.")
			groupId = runner.questioner.Ask("Enter a message group ID: ")
			if !contentBasedDeduplication {
				log.Println("Because you are not using content-based deduplication,\n" +
					"you must enter a deduplication ID.")
				dedupId = runner.questioner.Ask("Enter a deduplication ID: ")
			}
		}
		if usingFilters {
			if runner.questioner.AskBool("Add a tone attribute so this message can be filtered? (y/n) ", "y") {
				toneIndex := runner.questioner.AskChoice(
					"Enter the number of the tone you want to filter by:\n", ToneChoices)
				toneSelection = ToneChoices[toneIndex]
			}
		}

		err := runner.snsActor.Publish(ctx, topicArn, message, groupId, dedupId, TONE_KEY, toneSelection)
		if err != nil {
			panic(err)
		}
		log.Println(("Your message was published."))

		publishMore = runner.questioner.AskBool("Do you want to publish another messsage? (y/n) ", "y")
	}
}

func (runner ScenarioRunner) PollForMessages(ctx context.Context, queueUrls []string) {
	log.Println("Polling queues for messages...")
	for _, queueUrl := range queueUrls {
		var messages []types.Message
		for {
			currentMsgs, err := runner.sqsActor.GetMessages(ctx, queueUrl, 10, 1)
			if err != nil {
				panic(err)
			}
			if len(currentMsgs) == 0 {
				break
			}
			messages = append(messages, currentMsgs...)
		}
		if len(messages) == 0 {
			log.Printf("No messages were received by queue %v.\n", queueUrl)
		} else if len(messages) == 1 {
			log.Printf("One message was received by queue %v:\n", queueUrl)

		} else {
			log.Printf("%v messages were received by queue %v:\n", len(messages), queueUrl)
		}
		for msgIndex, message := range messages {
			messageBody := MessageBody{}
			err := json.Unmarshal([]byte(*message.Body), &messageBody)
			if err != nil {
				panic(err)
			}
			log.Printf("Message %v: %v\n", msgIndex+1, messageBody.Message)
		}

		if len(messages) > 0 {
			log.Printf("Deleting %v messages from queue %v.\n", len(messages), queueUrl)
			err := runner.sqsActor.DeleteMessages(ctx, queueUrl, messages)
			if err != nil {
				panic(err)
			}
		}
	}
}

// RunTopicsAndQueuesScenario is an interactive example that shows you how to use the
// AWS SDK for Go to create and use Amazon SNS topics and Amazon SQS queues.
//
// 1. Create a topic (FIFO or non-FIFO).
// 2. Subscribe several queues to the topic with an option to apply a filter.
// 3. Publish messages to the topic.
// 4. Poll the queues for messages received.
// 5. Delete the topic and the queues.
//
// This example creates service clients from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
func RunTopicsAndQueuesScenario(
	ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner) {
	resources := Resources{}
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.\n" +
				"Cleaning up any resources that were created...")
			resources.Cleanup(ctx)
		}
	}()
	queueCount := 2

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome to messaging with topics and queues.\n\n"+
		"In this scenario, you will create an SNS topic and subscribe %v SQS queues to the\n"+
		"topic. You can select from several options for configuring the topic and the\n"+
		"subscriptions for the queues. You can then post to the topic and see the results\n"+
		"in the queues.\n", queueCount)

	log.Println(strings.Repeat("-", 88))

	runner := ScenarioRunner{
		questioner: questioner,
		snsActor:   &actions.SnsActions{SnsClient: sns.NewFromConfig(sdkConfig)},
		sqsActor:   &actions.SqsActions{SqsClient: sqs.NewFromConfig(sdkConfig)},
	}
	resources.snsActor = runner.snsActor
	resources.sqsActor = runner.sqsActor

	topicName, topicArn, isFifoTopic, contentBasedDeduplication := runner.CreateTopic(ctx)
	resources.topicArn = topicArn
	log.Println(strings.Repeat("-", 88))

	log.Printf("Now you will create %v SQS queues and subscribe them to the topic.\n", queueCount)
	ordinals := []string{"first", "next"}
	usingFilters := false
	for _, ordinal := range ordinals {
		queueName, queueUrl := runner.CreateQueue(ctx, ordinal, isFifoTopic)
		resources.queueUrls = append(resources.queueUrls, queueUrl)

		_, filtering := runner.SubscribeQueueToTopic(ctx, queueName, queueUrl, topicName, topicArn, ordinal, isFifoTopic)
		usingFilters = usingFilters || filtering
	}

	log.Println(strings.Repeat("-", 88))
	runner.PublishMessages(ctx, topicArn, isFifoTopic, contentBasedDeduplication, usingFilters)
	log.Println(strings.Repeat("-", 88))
	runner.PollForMessages(ctx, resources.queueUrls)

	log.Println(strings.Repeat("-", 88))

	wantCleanup := questioner.AskBool("Do you want to remove all AWS resources created for this scenario? (y/n) ", "y")
	if wantCleanup {
		log.Println("Cleaning up resources...")
		resources.Cleanup(ctx)
	}

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 Amazon SNS 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// CreateTopic creates an Amazon SNS topic with the specified name. You can optionally
// specify that the topic is created as a FIFO topic and whether it uses content-based
// deduplication instead of ID-based deduplication.
func (actor SnsActions) CreateTopic(ctx context.Context, topicName string, isFifoTopic bool, contentBasedDeduplication bool) (string, error) {
	var topicArn string
	topicAttributes := map[string]string{}
	if isFifoTopic {
		topicAttributes["FifoTopic"] = "true"
	}
	if contentBasedDeduplication {
		topicAttributes["ContentBasedDeduplication"] = "true"
	}
	topic, err := actor.SnsClient.CreateTopic(ctx, &sns.CreateTopicInput{
		Name:       aws.String(topicName),
		Attributes: topicAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create topic %v. Here's why: %v\n", topicName, err)
	} else {
		topicArn = *topic.TopicArn
	}

	return topicArn, err
}



// DeleteTopic delete an Amazon SNS topic.
func (actor SnsActions) DeleteTopic(ctx context.Context, topicArn string) error {
	_, err := actor.SnsClient.DeleteTopic(ctx, &sns.DeleteTopicInput{
		TopicArn: aws.String(topicArn)})
	if err != nil {
		log.Printf("Couldn't delete topic %v. Here's why: %v\n", topicArn, err)
	}
	return err
}



// SubscribeQueue subscribes an Amazon Simple Queue Service (Amazon SQS) queue to an
// Amazon SNS topic. When filterMap is not nil, it is used to specify a filter policy
// so that messages are only sent to the queue when the message has the specified attributes.
func (actor SnsActions) SubscribeQueue(ctx context.Context, topicArn string, queueArn string, filterMap map[string][]string) (string, error) {
	var subscriptionArn string
	var attributes map[string]string
	if filterMap != nil {
		filterBytes, err := json.Marshal(filterMap)
		if err != nil {
			log.Printf("Couldn't create filter policy, here's why: %v\n", err)
			return "", err
		}
		attributes = map[string]string{"FilterPolicy": string(filterBytes)}
	}
	output, err := actor.SnsClient.Subscribe(ctx, &sns.SubscribeInput{
		Protocol:              aws.String("sqs"),
		TopicArn:              aws.String(topicArn),
		Attributes:            attributes,
		Endpoint:              aws.String(queueArn),
		ReturnSubscriptionArn: true,
	})
	if err != nil {
		log.Printf("Couldn't susbscribe queue %v to topic %v. Here's why: %v\n",
			queueArn, topicArn, err)
	} else {
		subscriptionArn = *output.SubscriptionArn
	}

	return subscriptionArn, err
}



// Publish publishes a message to an Amazon SNS topic. The message is then sent to all
// subscribers. When the topic is a FIFO topic, the message must also contain a group ID
// and, when ID-based deduplication is used, a deduplication ID. An optional key-value
// filter attribute can be specified so that the message can be filtered according to
// a filter policy.
func (actor SnsActions) Publish(ctx context.Context, topicArn string, message string, groupId string, dedupId string, filterKey string, filterValue string) error {
	publishInput := sns.PublishInput{TopicArn: aws.String(topicArn), Message: aws.String(message)}
	if groupId != "" {
		publishInput.MessageGroupId = aws.String(groupId)
	}
	if dedupId != "" {
		publishInput.MessageDeduplicationId = aws.String(dedupId)
	}
	if filterKey != "" && filterValue != "" {
		publishInput.MessageAttributes = map[string]types.MessageAttributeValue{
			filterKey: {DataType: aws.String("String"), StringValue: aws.String(filterValue)},
		}
	}
	_, err := actor.SnsClient.Publish(ctx, &publishInput)
	if err != nil {
		log.Printf("Couldn't publish message to topic %v. Here's why: %v", topicArn, err)
	}
	return err
}
```
이 예시에서 사용되는 Amazon SQS 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// CreateQueue creates an Amazon SQS queue with the specified name. You can specify
// whether the queue is created as a FIFO queue.
func (actor SqsActions) CreateQueue(ctx context.Context, queueName string, isFifoQueue bool) (string, error) {
	var queueUrl string
	queueAttributes := map[string]string{}
	if isFifoQueue {
		queueAttributes["FifoQueue"] = "true"
	}
	queue, err := actor.SqsClient.CreateQueue(ctx, &sqs.CreateQueueInput{
		QueueName:  aws.String(queueName),
		Attributes: queueAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create queue %v. Here's why: %v\n", queueName, err)
	} else {
		queueUrl = *queue.QueueUrl
	}

	return queueUrl, err
}



// GetQueueArn uses the GetQueueAttributes action to get the Amazon Resource Name (ARN)
// of an Amazon SQS queue.
func (actor SqsActions) GetQueueArn(ctx context.Context, queueUrl string) (string, error) {
	var queueArn string
	arnAttributeName := types.QueueAttributeNameQueueArn
	attribute, err := actor.SqsClient.GetQueueAttributes(ctx, &sqs.GetQueueAttributesInput{
		QueueUrl:       aws.String(queueUrl),
		AttributeNames: []types.QueueAttributeName{arnAttributeName},
	})
	if err != nil {
		log.Printf("Couldn't get ARN for queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		queueArn = attribute.Attributes[string(arnAttributeName)]
	}
	return queueArn, err
}



// AttachSendMessagePolicy uses the SetQueueAttributes action to attach a policy to an
// Amazon SQS queue that allows the specified Amazon SNS topic to send messages to the
// queue.
func (actor SqsActions) AttachSendMessagePolicy(ctx context.Context, queueUrl string, queueArn string, topicArn string) error {
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:    "Allow",
			Action:    "sqs:SendMessage",
			Principal: map[string]string{"Service": "sns.amazonaws.com"},
			Resource:  aws.String(queueArn),
			Condition: PolicyCondition{"ArnEquals": map[string]string{"aws:SourceArn": topicArn}},
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document. Here's why: %v\n", err)
		return err
	}
	_, err = actor.SqsClient.SetQueueAttributes(ctx, &sqs.SetQueueAttributesInput{
		Attributes: map[string]string{
			string(types.QueueAttributeNamePolicy): string(policyBytes),
		},
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't set send message policy on queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}

// PolicyDocument defines a policy document as a Go struct that can be serialized
// to JSON.
type PolicyDocument struct {
	Version   string
	Statement []PolicyStatement
}

// PolicyStatement defines a statement in a policy document.
type PolicyStatement struct {
	Effect    string
	Action    string
	Principal map[string]string `json:",omitempty"`
	Resource  *string           `json:",omitempty"`
	Condition PolicyCondition   `json:",omitempty"`
}

// PolicyCondition defines a condition in a policy.
type PolicyCondition map[string]map[string]string



// GetMessages uses the ReceiveMessage action to get messages from an Amazon SQS queue.
func (actor SqsActions) GetMessages(ctx context.Context, queueUrl string, maxMessages int32, waitTime int32) ([]types.Message, error) {
	var messages []types.Message
	result, err := actor.SqsClient.ReceiveMessage(ctx, &sqs.ReceiveMessageInput{
		QueueUrl:            aws.String(queueUrl),
		MaxNumberOfMessages: maxMessages,
		WaitTimeSeconds:     waitTime,
	})
	if err != nil {
		log.Printf("Couldn't get messages from queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		messages = result.Messages
	}
	return messages, err
}



// DeleteMessages uses the DeleteMessageBatch action to delete a batch of messages from
// an Amazon SQS queue.
func (actor SqsActions) DeleteMessages(ctx context.Context, queueUrl string, messages []types.Message) error {
	entries := make([]types.DeleteMessageBatchRequestEntry, len(messages))
	for msgIndex := range messages {
		entries[msgIndex].Id = aws.String(fmt.Sprintf("%v", msgIndex))
		entries[msgIndex].ReceiptHandle = messages[msgIndex].ReceiptHandle
	}
	_, err := actor.SqsClient.DeleteMessageBatch(ctx, &sqs.DeleteMessageBatchInput{
		Entries:  entries,
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't delete messages from queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}



// DeleteQueue deletes an Amazon SQS queue.
func (actor SqsActions) DeleteQueue(ctx context.Context, queueUrl string) error {
	_, err := actor.SqsClient.DeleteQueue(ctx, &sqs.DeleteQueueInput{
		QueueUrl: aws.String(queueUrl)})
	if err != nil {
		log.Printf("Couldn't delete queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"topics_and_queues/actions"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	topicArn  string
	queueUrls []string
	snsActor  *actions.SnsActions
	sqsActor  *actions.SqsActions
}

// Cleanup deletes all AWS resources created during an example.
func (resources Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("Something went wrong during cleanup. Use the AWS Management Console\n" +
				"to remove any remaining resources that were created for this scenario.")
		}
	}()

	var err error
	if resources.topicArn != "" {
		log.Printf("Deleting topic %v.\n", resources.topicArn)
		err = resources.snsActor.DeleteTopic(ctx, resources.topicArn)
		if err != nil {
			panic(err)
		}
	}

	for _, queueUrl := range resources.queueUrls {
		log.Printf("Deleting queue %v.\n", queueUrl)
		err = resources.sqsActor.DeleteQueue(ctx, queueUrl)
		if err != nil {
			panic(err)
		}
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [CreateQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.CreateQueue)
  + [CreateTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.CreateTopic)
  + [DeleteMessageBatch](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteMessageBatch)
  + [DeleteQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteQueue)
  + [DeleteTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.DeleteTopic)
  + [GetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.GetQueueAttributes)
  + [Publish](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Publish)
  + [ReceiveMessage](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.ReceiveMessage)
  + [SetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.SetQueueAttributes)
  + [Subscribe](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Subscribe)
  + [Unsubscribe](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Unsubscribe)

## 서버리스 예제
<a name="serverless_examples"></a>

### Amazon SNS 트리거를 사용하여 Lambda 함수 간접 호출
<a name="serverless_SNS_Lambda_go_2_topic"></a>

다음 코드 예제에서는 SNS 주제의 메시지를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 함수는 이벤트 파라미터에서 메시지를 검색하고 각 메시지의 내용을 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sns-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SNS 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, snsEvent events.SNSEvent) {
	for _, record := range snsEvent.Records {
		processMessage(record)
	}
	fmt.Println("done")
}

func processMessage(record events.SNSEventRecord) {
	message := record.SNS.Message
	fmt.Printf("Processed message: %s\n", message)
	// TODO: Process your record here
}

func main() {
	lambda.Start(handler)
}
```

# SDK for Go V2를 사용한 Amazon SQS 예제
<a name="go_2_sqs_code_examples"></a>

다음 코드 예제에서는 Amazon SQS에서 AWS SDK for Go V2를 사용하여 작업을 수행하고 일반적인 시나리오를 구현하는 방법을 보여줍니다.

*작업*은 대규모 프로그램에서 발췌한 코드이며 컨텍스트에 맞춰 실행해야 합니다. 작업은 개별 서비스 함수를 직접 호출하는 방법을 보여주며, 관련 시나리오의 컨텍스트에 맞는 작업을 볼 수 있습니다.

*시나리오*는 동일한 서비스 내에서 또는 다른 AWS 서비스와 결합된 상태에서 여러 함수를 직접적으로 호출하여 특정 태스크를 수행하는 방법을 보여주는 코드 예제입니다.

각 예시에는 전체 소스 코드에 대한 링크가 포함되어 있으며, 여기에서 컨텍스트에 맞춰 코드를 설정하고 실행하는 방법에 대한 지침을 찾을 수 있습니다.

**Topics**
+ [시작하기](#get_started)
+ [작업](#actions)
+ [시나리오](#scenarios)
+ [서버리스 예제](#serverless_examples)

## 시작하기
<a name="get_started"></a>

### Hello Amazon SNS
<a name="sqs_Hello_go_2_topic"></a>

다음 코드 예제에서는 Amazon SQS 사용을 시작하는 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/sqs#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Queue Service
// (Amazon SQS) client and list the queues in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	sqsClient := sqs.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the queues for your account.")
	var queueUrls []string
	paginator := sqs.NewListQueuesPaginator(sqsClient, &sqs.ListQueuesInput{})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get queues. Here's why: %v\n", err)
			break
		} else {
			queueUrls = append(queueUrls, output.QueueUrls...)
		}
	}
	if len(queueUrls) == 0 {
		fmt.Println("You don't have any queues!")
	} else {
		for _, queueUrl := range queueUrls {
			fmt.Printf("\t%v\n", queueUrl)
		}
	}
}
```
+  API에 대한 세부 정보는 *AWS SDK for Go API 참조*의 [ListQueues](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.ListQueues)를 참조하세요.

## 작업
<a name="actions"></a>

### `CreateQueue`
<a name="sqs_CreateQueue_go_2_topic"></a>

다음 코드 예시는 `CreateQueue`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// CreateQueue creates an Amazon SQS queue with the specified name. You can specify
// whether the queue is created as a FIFO queue.
func (actor SqsActions) CreateQueue(ctx context.Context, queueName string, isFifoQueue bool) (string, error) {
	var queueUrl string
	queueAttributes := map[string]string{}
	if isFifoQueue {
		queueAttributes["FifoQueue"] = "true"
	}
	queue, err := actor.SqsClient.CreateQueue(ctx, &sqs.CreateQueueInput{
		QueueName:  aws.String(queueName),
		Attributes: queueAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create queue %v. Here's why: %v\n", queueName, err)
	} else {
		queueUrl = *queue.QueueUrl
	}

	return queueUrl, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [CreateQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.CreateQueue)를 참조하세요.

### `DeleteMessageBatch`
<a name="sqs_DeleteMessageBatch_go_2_topic"></a>

다음 코드 예시는 `DeleteMessageBatch`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// DeleteMessages uses the DeleteMessageBatch action to delete a batch of messages from
// an Amazon SQS queue.
func (actor SqsActions) DeleteMessages(ctx context.Context, queueUrl string, messages []types.Message) error {
	entries := make([]types.DeleteMessageBatchRequestEntry, len(messages))
	for msgIndex := range messages {
		entries[msgIndex].Id = aws.String(fmt.Sprintf("%v", msgIndex))
		entries[msgIndex].ReceiptHandle = messages[msgIndex].ReceiptHandle
	}
	_, err := actor.SqsClient.DeleteMessageBatch(ctx, &sqs.DeleteMessageBatchInput{
		Entries:  entries,
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't delete messages from queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteMessageBatch](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteMessageBatch)를 참조하세요.

### `DeleteQueue`
<a name="sqs_DeleteQueue_go_2_topic"></a>

다음 코드 예시는 `DeleteQueue`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// DeleteQueue deletes an Amazon SQS queue.
func (actor SqsActions) DeleteQueue(ctx context.Context, queueUrl string) error {
	_, err := actor.SqsClient.DeleteQueue(ctx, &sqs.DeleteQueueInput{
		QueueUrl: aws.String(queueUrl)})
	if err != nil {
		log.Printf("Couldn't delete queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [DeleteQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteQueue)를 참조하세요.

### `GetQueueAttributes`
<a name="sqs_GetQueueAttributes_go_2_topic"></a>

다음 코드 예시는 `GetQueueAttributes`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// GetQueueArn uses the GetQueueAttributes action to get the Amazon Resource Name (ARN)
// of an Amazon SQS queue.
func (actor SqsActions) GetQueueArn(ctx context.Context, queueUrl string) (string, error) {
	var queueArn string
	arnAttributeName := types.QueueAttributeNameQueueArn
	attribute, err := actor.SqsClient.GetQueueAttributes(ctx, &sqs.GetQueueAttributesInput{
		QueueUrl:       aws.String(queueUrl),
		AttributeNames: []types.QueueAttributeName{arnAttributeName},
	})
	if err != nil {
		log.Printf("Couldn't get ARN for queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		queueArn = attribute.Attributes[string(arnAttributeName)]
	}
	return queueArn, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [GetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.GetQueueAttributes)를 참조하세요.

### `ListQueues`
<a name="sqs_ListQueues_go_2_topic"></a>

다음 코드 예시는 `ListQueues`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/sqs#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Queue Service
// (Amazon SQS) client and list the queues in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	sqsClient := sqs.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the queues for your account.")
	var queueUrls []string
	paginator := sqs.NewListQueuesPaginator(sqsClient, &sqs.ListQueuesInput{})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get queues. Here's why: %v\n", err)
			break
		} else {
			queueUrls = append(queueUrls, output.QueueUrls...)
		}
	}
	if len(queueUrls) == 0 {
		fmt.Println("You don't have any queues!")
	} else {
		for _, queueUrl := range queueUrls {
			fmt.Printf("\t%v\n", queueUrl)
		}
	}
}
```
+  API에 대한 세부 정보는 *AWS SDK for Go API 참조*의 [ListQueues](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.ListQueues)를 참조하세요.

### `ReceiveMessage`
<a name="sqs_ReceiveMessage_go_2_topic"></a>

다음 코드 예시는 `ReceiveMessage`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// GetMessages uses the ReceiveMessage action to get messages from an Amazon SQS queue.
func (actor SqsActions) GetMessages(ctx context.Context, queueUrl string, maxMessages int32, waitTime int32) ([]types.Message, error) {
	var messages []types.Message
	result, err := actor.SqsClient.ReceiveMessage(ctx, &sqs.ReceiveMessageInput{
		QueueUrl:            aws.String(queueUrl),
		MaxNumberOfMessages: maxMessages,
		WaitTimeSeconds:     waitTime,
	})
	if err != nil {
		log.Printf("Couldn't get messages from queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		messages = result.Messages
	}
	return messages, err
}
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [ReceiveMessage](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.ReceiveMessage)를 참조하세요.

### `SetQueueAttributes`
<a name="sqs_SetQueueAttributes_go_2_topic"></a>

다음 코드 예시는 `SetQueueAttributes`의 사용 방법을 보여줍니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// AttachSendMessagePolicy uses the SetQueueAttributes action to attach a policy to an
// Amazon SQS queue that allows the specified Amazon SNS topic to send messages to the
// queue.
func (actor SqsActions) AttachSendMessagePolicy(ctx context.Context, queueUrl string, queueArn string, topicArn string) error {
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:    "Allow",
			Action:    "sqs:SendMessage",
			Principal: map[string]string{"Service": "sns.amazonaws.com"},
			Resource:  aws.String(queueArn),
			Condition: PolicyCondition{"ArnEquals": map[string]string{"aws:SourceArn": topicArn}},
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document. Here's why: %v\n", err)
		return err
	}
	_, err = actor.SqsClient.SetQueueAttributes(ctx, &sqs.SetQueueAttributesInput{
		Attributes: map[string]string{
			string(types.QueueAttributeNamePolicy): string(policyBytes),
		},
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't set send message policy on queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}

// PolicyDocument defines a policy document as a Go struct that can be serialized
// to JSON.
type PolicyDocument struct {
	Version   string
	Statement []PolicyStatement
}

// PolicyStatement defines a statement in a policy document.
type PolicyStatement struct {
	Effect    string
	Action    string
	Principal map[string]string `json:",omitempty"`
	Resource  *string           `json:",omitempty"`
	Condition PolicyCondition   `json:",omitempty"`
}

// PolicyCondition defines a condition in a policy.
type PolicyCondition map[string]map[string]string
```
+  API 세부 정보는 *AWS SDK for Go API 참조*의 [SetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.SetQueueAttributes)를 참조하세요.

## 시나리오
<a name="scenarios"></a>

### 대기열에 메시지 게시
<a name="sqs_Scenario_TopicsAndQueues_go_2_topic"></a>

다음 코드 예제에서는 다음과 같은 작업을 수행하는 방법을 보여줍니다.
+ 주제(FIFO 또는 비 FIFO)를 생성합니다.
+ 필터 적용 옵션을 사용하여 여러 개의 대기열로 주제를 구독합니다.
+ 주제에 메시지를 게시합니다.
+ 대기열에서 받은 메시지를 폴링합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [AWS 코드 예 리포지토리](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/topics_and_queues#code-examples)에서 전체 예를 찾고 설정 및 실행하는 방법을 배워보세요.
명령 프롬프트에서 대화형 시나리오를 실행합니다.  

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"strings"
	"topics_and_queues/actions"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
	"github.com/awsdocs/aws-doc-sdk-examples/gov2/demotools"
)

const FIFO_SUFFIX = ".fifo"
const TONE_KEY = "tone"

var ToneChoices = []string{"cheerful", "funny", "serious", "sincere"}

// MessageBody is used to deserialize the body of a message from a JSON string.
type MessageBody struct {
	Message string
}

// ScenarioRunner separates the steps of this scenario into individual functions so that
// they are simpler to read and understand.
type ScenarioRunner struct {
	questioner demotools.IQuestioner
	snsActor   *actions.SnsActions
	sqsActor   *actions.SqsActions
}

func (runner ScenarioRunner) CreateTopic(ctx context.Context) (string, string, bool, bool) {
	log.Println("SNS topics can be configured as FIFO (First-In-First-Out) or standard.\n" +
		"FIFO topics deliver messages in order and support deduplication and message filtering.")
	isFifoTopic := runner.questioner.AskBool("\nWould you like to work with FIFO topics? (y/n) ", "y")

	contentBasedDeduplication := false
	if isFifoTopic {
		log.Println(strings.Repeat("-", 88))
		log.Println("Because you have chosen a FIFO topic, deduplication is supported.\n" +
			"Deduplication IDs are either set in the message or are automatically generated\n" +
			"from content using a hash function. If a message is successfully published to\n" +
			"an SNS FIFO topic, any message published and determined to have the same\n" +
			"deduplication ID, within the five-minute deduplication interval, is accepted\n" +
			"but not delivered. For more information about deduplication, see:\n" +
			"\thttps://docs.aws.amazon.com/sns/latest/dg/fifo-message-dedup.html.")
		contentBasedDeduplication = runner.questioner.AskBool(
			"\nDo you want to use content-based deduplication instead of entering a deduplication ID? (y/n) ", "y")
	}
	log.Println(strings.Repeat("-", 88))

	topicName := runner.questioner.Ask("Enter a name for your SNS topic. ")
	if isFifoTopic {
		topicName = fmt.Sprintf("%v%v", topicName, FIFO_SUFFIX)
		log.Printf("Because you have selected a FIFO topic, '%v' must be appended to\n"+
			"the topic name.", FIFO_SUFFIX)
	}

	topicArn, err := runner.snsActor.CreateTopic(ctx, topicName, isFifoTopic, contentBasedDeduplication)
	if err != nil {
		panic(err)
	}
	log.Printf("Your new topic with the name '%v' and Amazon Resource Name (ARN) \n"+
		"'%v' has been created.", topicName, topicArn)

	return topicName, topicArn, isFifoTopic, contentBasedDeduplication
}

func (runner ScenarioRunner) CreateQueue(ctx context.Context, ordinal string, isFifoTopic bool) (string, string) {
	queueName := runner.questioner.Ask(fmt.Sprintf("Enter a name for the %v SQS queue. ", ordinal))
	if isFifoTopic {
		queueName = fmt.Sprintf("%v%v", queueName, FIFO_SUFFIX)
		if ordinal == "first" {
			log.Printf("Because you are creating a FIFO SQS queue, '%v' must "+
				"be appended to the queue name.\n", FIFO_SUFFIX)
		}
	}
	queueUrl, err := runner.sqsActor.CreateQueue(ctx, queueName, isFifoTopic)
	if err != nil {
		panic(err)
	}
	log.Printf("Your new SQS queue with the name '%v' and the queue URL "+
		"'%v' has been created.", queueName, queueUrl)

	return queueName, queueUrl
}

func (runner ScenarioRunner) SubscribeQueueToTopic(
	ctx context.Context, queueName string, queueUrl string, topicName string, topicArn string, ordinal string,
	isFifoTopic bool) (string, bool) {

	queueArn, err := runner.sqsActor.GetQueueArn(ctx, queueUrl)
	if err != nil {
		panic(err)
	}
	log.Printf("The ARN of your queue is: %v.\n", queueArn)

	err = runner.sqsActor.AttachSendMessagePolicy(ctx, queueUrl, queueArn, topicArn)
	if err != nil {
		panic(err)
	}
	log.Println("Attached an IAM policy to the queue so the SNS topic can send " +
		"messages to it.")
	log.Println(strings.Repeat("-", 88))

	var filterPolicy map[string][]string
	if isFifoTopic {
		if ordinal == "first" {
			log.Println("Subscriptions to a FIFO topic can have filters.\n" +
				"If you add a filter to this subscription, then only the filtered messages\n" +
				"will be received in the queue.\n" +
				"For information about message filtering, see\n" +
				"\thttps://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html\n" +
				"For this example, you can filter messages by a \"tone\" attribute.")
		}

		wantFiltering := runner.questioner.AskBool(
			fmt.Sprintf("Do you want to filter messages that are sent to \"%v\"\n"+
				"from the %v topic? (y/n) ", queueName, topicName), "y")
		if wantFiltering {
			log.Println("You can filter messages by one or more of the following \"tone\" attributes.")

			var toneSelections []string
			askAboutTones := true
			for askAboutTones {
				toneIndex := runner.questioner.AskChoice(
					"Enter the number of the tone you want to filter by:\n", ToneChoices)
				toneSelections = append(toneSelections, ToneChoices[toneIndex])
				askAboutTones = runner.questioner.AskBool("Do you want to add another tone to the filter? (y/n) ", "y")
			}
			log.Printf("Your subscription will be filtered to only pass the following tones: %v\n", toneSelections)
			filterPolicy = map[string][]string{TONE_KEY: toneSelections}
		}
	}

	subscriptionArn, err := runner.snsActor.SubscribeQueue(ctx, topicArn, queueArn, filterPolicy)
	if err != nil {
		panic(err)
	}
	log.Printf("The queue %v is now subscribed to the topic %v with the subscription ARN %v.\n",
		queueName, topicName, subscriptionArn)

	return subscriptionArn, filterPolicy != nil
}

func (runner ScenarioRunner) PublishMessages(ctx context.Context, topicArn string, isFifoTopic bool, contentBasedDeduplication bool, usingFilters bool) {
	var message string
	var groupId string
	var dedupId string
	var toneSelection string
	publishMore := true
	for publishMore {
		groupId = ""
		dedupId = ""
		toneSelection = ""
		message = runner.questioner.Ask("Enter a message to publish: ")
		if isFifoTopic {
			log.Println("Because you are using a FIFO topic, you must set a message group ID.\n" +
				"All messages within the same group will be received in the order they were published.")
			groupId = runner.questioner.Ask("Enter a message group ID: ")
			if !contentBasedDeduplication {
				log.Println("Because you are not using content-based deduplication,\n" +
					"you must enter a deduplication ID.")
				dedupId = runner.questioner.Ask("Enter a deduplication ID: ")
			}
		}
		if usingFilters {
			if runner.questioner.AskBool("Add a tone attribute so this message can be filtered? (y/n) ", "y") {
				toneIndex := runner.questioner.AskChoice(
					"Enter the number of the tone you want to filter by:\n", ToneChoices)
				toneSelection = ToneChoices[toneIndex]
			}
		}

		err := runner.snsActor.Publish(ctx, topicArn, message, groupId, dedupId, TONE_KEY, toneSelection)
		if err != nil {
			panic(err)
		}
		log.Println(("Your message was published."))

		publishMore = runner.questioner.AskBool("Do you want to publish another messsage? (y/n) ", "y")
	}
}

func (runner ScenarioRunner) PollForMessages(ctx context.Context, queueUrls []string) {
	log.Println("Polling queues for messages...")
	for _, queueUrl := range queueUrls {
		var messages []types.Message
		for {
			currentMsgs, err := runner.sqsActor.GetMessages(ctx, queueUrl, 10, 1)
			if err != nil {
				panic(err)
			}
			if len(currentMsgs) == 0 {
				break
			}
			messages = append(messages, currentMsgs...)
		}
		if len(messages) == 0 {
			log.Printf("No messages were received by queue %v.\n", queueUrl)
		} else if len(messages) == 1 {
			log.Printf("One message was received by queue %v:\n", queueUrl)

		} else {
			log.Printf("%v messages were received by queue %v:\n", len(messages), queueUrl)
		}
		for msgIndex, message := range messages {
			messageBody := MessageBody{}
			err := json.Unmarshal([]byte(*message.Body), &messageBody)
			if err != nil {
				panic(err)
			}
			log.Printf("Message %v: %v\n", msgIndex+1, messageBody.Message)
		}

		if len(messages) > 0 {
			log.Printf("Deleting %v messages from queue %v.\n", len(messages), queueUrl)
			err := runner.sqsActor.DeleteMessages(ctx, queueUrl, messages)
			if err != nil {
				panic(err)
			}
		}
	}
}

// RunTopicsAndQueuesScenario is an interactive example that shows you how to use the
// AWS SDK for Go to create and use Amazon SNS topics and Amazon SQS queues.
//
// 1. Create a topic (FIFO or non-FIFO).
// 2. Subscribe several queues to the topic with an option to apply a filter.
// 3. Publish messages to the topic.
// 4. Poll the queues for messages received.
// 5. Delete the topic and the queues.
//
// This example creates service clients from the specified sdkConfig so that
// you can replace it with a mocked or stubbed config for unit testing.
//
// It uses a questioner from the `demotools` package to get input during the example.
// This package can be found in the ..\..\demotools folder of this repo.
func RunTopicsAndQueuesScenario(
	ctx context.Context, sdkConfig aws.Config, questioner demotools.IQuestioner) {
	resources := Resources{}
	defer func() {
		if r := recover(); r != nil {
			log.Println("Something went wrong with the demo.\n" +
				"Cleaning up any resources that were created...")
			resources.Cleanup(ctx)
		}
	}()
	queueCount := 2

	log.Println(strings.Repeat("-", 88))
	log.Printf("Welcome to messaging with topics and queues.\n\n"+
		"In this scenario, you will create an SNS topic and subscribe %v SQS queues to the\n"+
		"topic. You can select from several options for configuring the topic and the\n"+
		"subscriptions for the queues. You can then post to the topic and see the results\n"+
		"in the queues.\n", queueCount)

	log.Println(strings.Repeat("-", 88))

	runner := ScenarioRunner{
		questioner: questioner,
		snsActor:   &actions.SnsActions{SnsClient: sns.NewFromConfig(sdkConfig)},
		sqsActor:   &actions.SqsActions{SqsClient: sqs.NewFromConfig(sdkConfig)},
	}
	resources.snsActor = runner.snsActor
	resources.sqsActor = runner.sqsActor

	topicName, topicArn, isFifoTopic, contentBasedDeduplication := runner.CreateTopic(ctx)
	resources.topicArn = topicArn
	log.Println(strings.Repeat("-", 88))

	log.Printf("Now you will create %v SQS queues and subscribe them to the topic.\n", queueCount)
	ordinals := []string{"first", "next"}
	usingFilters := false
	for _, ordinal := range ordinals {
		queueName, queueUrl := runner.CreateQueue(ctx, ordinal, isFifoTopic)
		resources.queueUrls = append(resources.queueUrls, queueUrl)

		_, filtering := runner.SubscribeQueueToTopic(ctx, queueName, queueUrl, topicName, topicArn, ordinal, isFifoTopic)
		usingFilters = usingFilters || filtering
	}

	log.Println(strings.Repeat("-", 88))
	runner.PublishMessages(ctx, topicArn, isFifoTopic, contentBasedDeduplication, usingFilters)
	log.Println(strings.Repeat("-", 88))
	runner.PollForMessages(ctx, resources.queueUrls)

	log.Println(strings.Repeat("-", 88))

	wantCleanup := questioner.AskBool("Do you want to remove all AWS resources created for this scenario? (y/n) ", "y")
	if wantCleanup {
		log.Println("Cleaning up resources...")
		resources.Cleanup(ctx)
	}

	log.Println(strings.Repeat("-", 88))
	log.Println("Thanks for watching!")
	log.Println(strings.Repeat("-", 88))
}
```
이 예시에서 사용되는 Amazon SNS 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions
// used in the examples.
type SnsActions struct {
	SnsClient *sns.Client
}



// CreateTopic creates an Amazon SNS topic with the specified name. You can optionally
// specify that the topic is created as a FIFO topic and whether it uses content-based
// deduplication instead of ID-based deduplication.
func (actor SnsActions) CreateTopic(ctx context.Context, topicName string, isFifoTopic bool, contentBasedDeduplication bool) (string, error) {
	var topicArn string
	topicAttributes := map[string]string{}
	if isFifoTopic {
		topicAttributes["FifoTopic"] = "true"
	}
	if contentBasedDeduplication {
		topicAttributes["ContentBasedDeduplication"] = "true"
	}
	topic, err := actor.SnsClient.CreateTopic(ctx, &sns.CreateTopicInput{
		Name:       aws.String(topicName),
		Attributes: topicAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create topic %v. Here's why: %v\n", topicName, err)
	} else {
		topicArn = *topic.TopicArn
	}

	return topicArn, err
}



// DeleteTopic delete an Amazon SNS topic.
func (actor SnsActions) DeleteTopic(ctx context.Context, topicArn string) error {
	_, err := actor.SnsClient.DeleteTopic(ctx, &sns.DeleteTopicInput{
		TopicArn: aws.String(topicArn)})
	if err != nil {
		log.Printf("Couldn't delete topic %v. Here's why: %v\n", topicArn, err)
	}
	return err
}



// SubscribeQueue subscribes an Amazon Simple Queue Service (Amazon SQS) queue to an
// Amazon SNS topic. When filterMap is not nil, it is used to specify a filter policy
// so that messages are only sent to the queue when the message has the specified attributes.
func (actor SnsActions) SubscribeQueue(ctx context.Context, topicArn string, queueArn string, filterMap map[string][]string) (string, error) {
	var subscriptionArn string
	var attributes map[string]string
	if filterMap != nil {
		filterBytes, err := json.Marshal(filterMap)
		if err != nil {
			log.Printf("Couldn't create filter policy, here's why: %v\n", err)
			return "", err
		}
		attributes = map[string]string{"FilterPolicy": string(filterBytes)}
	}
	output, err := actor.SnsClient.Subscribe(ctx, &sns.SubscribeInput{
		Protocol:              aws.String("sqs"),
		TopicArn:              aws.String(topicArn),
		Attributes:            attributes,
		Endpoint:              aws.String(queueArn),
		ReturnSubscriptionArn: true,
	})
	if err != nil {
		log.Printf("Couldn't susbscribe queue %v to topic %v. Here's why: %v\n",
			queueArn, topicArn, err)
	} else {
		subscriptionArn = *output.SubscriptionArn
	}

	return subscriptionArn, err
}



// Publish publishes a message to an Amazon SNS topic. The message is then sent to all
// subscribers. When the topic is a FIFO topic, the message must also contain a group ID
// and, when ID-based deduplication is used, a deduplication ID. An optional key-value
// filter attribute can be specified so that the message can be filtered according to
// a filter policy.
func (actor SnsActions) Publish(ctx context.Context, topicArn string, message string, groupId string, dedupId string, filterKey string, filterValue string) error {
	publishInput := sns.PublishInput{TopicArn: aws.String(topicArn), Message: aws.String(message)}
	if groupId != "" {
		publishInput.MessageGroupId = aws.String(groupId)
	}
	if dedupId != "" {
		publishInput.MessageDeduplicationId = aws.String(dedupId)
	}
	if filterKey != "" && filterValue != "" {
		publishInput.MessageAttributes = map[string]types.MessageAttributeValue{
			filterKey: {DataType: aws.String("String"), StringValue: aws.String(filterValue)},
		}
	}
	_, err := actor.SnsClient.Publish(ctx, &publishInput)
	if err != nil {
		log.Printf("Couldn't publish message to topic %v. Here's why: %v", topicArn, err)
	}
	return err
}
```
이 예시에서 사용되는 Amazon SQS 작업을 래핑하는 구조를 정의합니다.  

```
import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

// SqsActions encapsulates the Amazon Simple Queue Service (Amazon SQS) actions
// used in the examples.
type SqsActions struct {
	SqsClient *sqs.Client
}



// CreateQueue creates an Amazon SQS queue with the specified name. You can specify
// whether the queue is created as a FIFO queue.
func (actor SqsActions) CreateQueue(ctx context.Context, queueName string, isFifoQueue bool) (string, error) {
	var queueUrl string
	queueAttributes := map[string]string{}
	if isFifoQueue {
		queueAttributes["FifoQueue"] = "true"
	}
	queue, err := actor.SqsClient.CreateQueue(ctx, &sqs.CreateQueueInput{
		QueueName:  aws.String(queueName),
		Attributes: queueAttributes,
	})
	if err != nil {
		log.Printf("Couldn't create queue %v. Here's why: %v\n", queueName, err)
	} else {
		queueUrl = *queue.QueueUrl
	}

	return queueUrl, err
}



// GetQueueArn uses the GetQueueAttributes action to get the Amazon Resource Name (ARN)
// of an Amazon SQS queue.
func (actor SqsActions) GetQueueArn(ctx context.Context, queueUrl string) (string, error) {
	var queueArn string
	arnAttributeName := types.QueueAttributeNameQueueArn
	attribute, err := actor.SqsClient.GetQueueAttributes(ctx, &sqs.GetQueueAttributesInput{
		QueueUrl:       aws.String(queueUrl),
		AttributeNames: []types.QueueAttributeName{arnAttributeName},
	})
	if err != nil {
		log.Printf("Couldn't get ARN for queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		queueArn = attribute.Attributes[string(arnAttributeName)]
	}
	return queueArn, err
}



// AttachSendMessagePolicy uses the SetQueueAttributes action to attach a policy to an
// Amazon SQS queue that allows the specified Amazon SNS topic to send messages to the
// queue.
func (actor SqsActions) AttachSendMessagePolicy(ctx context.Context, queueUrl string, queueArn string, topicArn string) error {
	policyDoc := PolicyDocument{
		Version: "2012-10-17",
		Statement: []PolicyStatement{{
			Effect:    "Allow",
			Action:    "sqs:SendMessage",
			Principal: map[string]string{"Service": "sns.amazonaws.com"},
			Resource:  aws.String(queueArn),
			Condition: PolicyCondition{"ArnEquals": map[string]string{"aws:SourceArn": topicArn}},
		}},
	}
	policyBytes, err := json.Marshal(policyDoc)
	if err != nil {
		log.Printf("Couldn't create policy document. Here's why: %v\n", err)
		return err
	}
	_, err = actor.SqsClient.SetQueueAttributes(ctx, &sqs.SetQueueAttributesInput{
		Attributes: map[string]string{
			string(types.QueueAttributeNamePolicy): string(policyBytes),
		},
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't set send message policy on queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}

// PolicyDocument defines a policy document as a Go struct that can be serialized
// to JSON.
type PolicyDocument struct {
	Version   string
	Statement []PolicyStatement
}

// PolicyStatement defines a statement in a policy document.
type PolicyStatement struct {
	Effect    string
	Action    string
	Principal map[string]string `json:",omitempty"`
	Resource  *string           `json:",omitempty"`
	Condition PolicyCondition   `json:",omitempty"`
}

// PolicyCondition defines a condition in a policy.
type PolicyCondition map[string]map[string]string



// GetMessages uses the ReceiveMessage action to get messages from an Amazon SQS queue.
func (actor SqsActions) GetMessages(ctx context.Context, queueUrl string, maxMessages int32, waitTime int32) ([]types.Message, error) {
	var messages []types.Message
	result, err := actor.SqsClient.ReceiveMessage(ctx, &sqs.ReceiveMessageInput{
		QueueUrl:            aws.String(queueUrl),
		MaxNumberOfMessages: maxMessages,
		WaitTimeSeconds:     waitTime,
	})
	if err != nil {
		log.Printf("Couldn't get messages from queue %v. Here's why: %v\n", queueUrl, err)
	} else {
		messages = result.Messages
	}
	return messages, err
}



// DeleteMessages uses the DeleteMessageBatch action to delete a batch of messages from
// an Amazon SQS queue.
func (actor SqsActions) DeleteMessages(ctx context.Context, queueUrl string, messages []types.Message) error {
	entries := make([]types.DeleteMessageBatchRequestEntry, len(messages))
	for msgIndex := range messages {
		entries[msgIndex].Id = aws.String(fmt.Sprintf("%v", msgIndex))
		entries[msgIndex].ReceiptHandle = messages[msgIndex].ReceiptHandle
	}
	_, err := actor.SqsClient.DeleteMessageBatch(ctx, &sqs.DeleteMessageBatchInput{
		Entries:  entries,
		QueueUrl: aws.String(queueUrl),
	})
	if err != nil {
		log.Printf("Couldn't delete messages from queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}



// DeleteQueue deletes an Amazon SQS queue.
func (actor SqsActions) DeleteQueue(ctx context.Context, queueUrl string) error {
	_, err := actor.SqsClient.DeleteQueue(ctx, &sqs.DeleteQueueInput{
		QueueUrl: aws.String(queueUrl)})
	if err != nil {
		log.Printf("Couldn't delete queue %v. Here's why: %v\n", queueUrl, err)
	}
	return err
}
```
리소스를 정리합니다.  

```
import (
	"context"
	"fmt"
	"log"
	"topics_and_queues/actions"
)

// Resources keeps track of AWS resources created during an example and handles
// cleanup when the example finishes.
type Resources struct {
	topicArn  string
	queueUrls []string
	snsActor  *actions.SnsActions
	sqsActor  *actions.SqsActions
}

// Cleanup deletes all AWS resources created during an example.
func (resources Resources) Cleanup(ctx context.Context) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("Something went wrong during cleanup. Use the AWS Management Console\n" +
				"to remove any remaining resources that were created for this scenario.")
		}
	}()

	var err error
	if resources.topicArn != "" {
		log.Printf("Deleting topic %v.\n", resources.topicArn)
		err = resources.snsActor.DeleteTopic(ctx, resources.topicArn)
		if err != nil {
			panic(err)
		}
	}

	for _, queueUrl := range resources.queueUrls {
		log.Printf("Deleting queue %v.\n", queueUrl)
		err = resources.sqsActor.DeleteQueue(ctx, queueUrl)
		if err != nil {
			panic(err)
		}
	}
}
```
+ API 세부 정보는 *AWS SDK for Go API 참조*의 다음 주제를 참조하세요.
  + [CreateQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.CreateQueue)
  + [CreateTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.CreateTopic)
  + [DeleteMessageBatch](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteMessageBatch)
  + [DeleteQueue](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.DeleteQueue)
  + [DeleteTopic](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.DeleteTopic)
  + [GetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.GetQueueAttributes)
  + [Publish](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Publish)
  + [ReceiveMessage](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.ReceiveMessage)
  + [SetQueueAttributes](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sqs#Client.SetQueueAttributes)
  + [Subscribe](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Subscribe)
  + [Unsubscribe](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/sns#Client.Unsubscribe)

## 서버리스 예제
<a name="serverless_examples"></a>

### Amazon SQS 트리거에서 간접적으로 Lambda 함수 간접 호출
<a name="serverless_SQS_Lambda_go_2_topic"></a>

다음 코드 예제는 SQS 대기열에서 메시지를 받아 트리거된 이벤트를 수신하는 Lambda 함수를 구현하는 방법을 보여줍니다. 함수는 이벤트 파라미터에서 메시지를 검색하고 각 메시지의 내용을 로깅합니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sqs-to-lambda) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SQS 이벤트를 사용합니다.  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package integration_sqs_to_lambda

import (
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(event events.SQSEvent) error {
	for _, record := range event.Records {
		err := processMessage(record)
		if err != nil {
			return err
		}
	}
	fmt.Println("done")
	return nil
}

func processMessage(record events.SQSMessage) error {
	fmt.Printf("Processed message %s\n", record.Body)
	// TODO: Do interesting work based on the new message
	return nil
}

func main() {
	lambda.Start(handler)
}
```

### Amazon SQS 트리거로 Lambda 함수에 대한 배치 항목 실패 보고
<a name="serverless_SQS_Lambda_batch_item_failures_go_2_topic"></a>

다음 코드 예제는 SQS 대기열에서 이벤트를 수신하는 Lambda 함수에 대한 부분 배치 응답을 구현하는 방법을 보여줍니다. 이 함수는 응답으로 배치 항목 실패를 보고하고 나중에 해당 메시지를 다시 시도하도록 Lambda에 신호를 보냅니다.

**SDK for Go V2**  
 GitHub에 더 많은 내용이 있습니다. [서버리스 예제](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-sqs-report-batch-item-failures) 리포지토리에서 전체 예제를 찾아보고 설정 및 실행 방법을 알아봅니다.
Go를 사용하여 Lambda로 SQS 배치 항목 실패 보고  

```
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package main

import (
	"context"
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, sqsEvent events.SQSEvent) (map[string]interface{}, error) {
	batchItemFailures := []map[string]interface{}{}

	for _, message := range sqsEvent.Records {
		if len(message.Body) > 0 {
			// Your message processing condition here
			fmt.Printf("Successfully processed message: %s\n", message.Body)
		} else {
			// Message processing failed
			fmt.Printf("Failed to process message %s\n", message.MessageId)
			batchItemFailures = append(batchItemFailures, map[string]interface{}{"itemIdentifier": message.MessageId})
		}
	}

	sqsBatchResponse := map[string]interface{}{
		"batchItemFailures": batchItemFailures,
	}
	return sqsBatchResponse, nil
}

func main() {
	lambda.Start(handler)
}
```