D'autres exemples de AWS SDK sont disponibles dans le référentiel [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub .

Les traductions sont fournies par des outils de traduction automatique. En cas de conflit entre le contenu d'une traduction et celui de la version originale en anglais, la version anglaise prévaudra.

# Exemples Lambda avec le kit SDK pour Go V2
<a name="go_2_lambda_code_examples"></a>

Les exemples de code suivants vous montrent comment effectuer des actions et implémenter des scénarios courants en utilisant la AWS SDK pour Go V2 avec Lambda.

Les *principes de base* sont des exemples de code qui vous montrent comment effectuer les opérations essentielles au sein d’un service.

Les *actions* sont des extraits de code de programmes plus larges et doivent être exécutées dans leur contexte. Alors que les actions vous indiquent comment appeler des fonctions de service individuelles, vous pouvez les voir en contexte dans leurs scénarios associés.

Les *scénarios* sont des exemples de code qui vous montrent comment accomplir des tâches spécifiques en appelant plusieurs fonctions au sein d’un même service ou combinés à d’autres Services AWS.

AWS les *contributions communautaires* sont des exemples qui ont été créés et sont maintenus par plusieurs équipes AWS. Pour faire un commentaire, utilisez le mécanisme fourni dans les référentiels liés.

Chaque exemple inclut un lien vers le code source complet, où vous trouverez des instructions sur la configuration et l’exécution du code en contexte.

**Topics**
+ [Mise en route](#get_started)
+ [Principes de base](#basics)
+ [Actions](#actions)
+ [Scénarios](#scenarios)
+ [Exemples sans serveur](#serverless_examples)
+ [AWS contributions communautaires](#aws_community_contributions)

## Mise en route
<a name="get_started"></a>

### Hello Lambda
<a name="lambda_Hello_go_2_topic"></a>

L'exemple de code suivant montre comment commencer à utiliser Lambda.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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)
		}
	}
}
```
+  Pour plus de détails sur l'API, voir [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.ListFunctions)la section *Référence des AWS SDK pour Go API*. 

## Principes de base
<a name="basics"></a>

### Principes de base
<a name="lambda_Scenario_GettingStartedFunctions_go_2_topic"></a>

L’exemple de code suivant illustre comment :
+ Créer un rôle IAM et une fonction Lambda, puis charger le code du gestionnaire.
+ Invoquer la fonction avec un seul paramètre et obtenir des résultats.
+ Mettre à jour le code de la fonction et configurer avec une variable d’environnement.
+ Invoquer la fonction avec de nouveaux paramètres et obtenir des résultats. Afficher le journal d’exécution renvoyé.
+ Répertorier les fonctions pour votre compte, puis nettoyer les ressources.

Pour plus d’informations, consultez [Créer une fonction Lambda à l’aide de la console](https://docs.aws.amazon.com/lambda/latest/dg/getting-started-create-function.html).

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 
Créez un scénario interactif qui vous montre comment démarrer avec les fonctions Lambda.  

```
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
}
```
Créez une structure qui englobe les actions Lambda individuelles.  

```
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"`
}
```
Définir un gestionnaire Lambda qui incrémente un nombre.  

```
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
```
Définir un deuxième gestionnaire Lambda qui effectue des opérations arithmétiques.  

```
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
```
+ Pour plus d’informations sur l’API, consultez les rubriques suivantes dans la *référence de l’API AWS SDK pour Go *.
  + [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)
  + [Invoke](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)

## Actions
<a name="actions"></a>

### `CreateFunction`
<a name="lambda_CreateFunction_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`CreateFunction`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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
}
```
+  Pour plus de détails sur l'API, voir [CreateFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.CreateFunction)la section *Référence des AWS SDK pour Go API*. 

### `DeleteFunction`
<a name="lambda_DeleteFunction_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`DeleteFunction`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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)
	}
}
```
+  Pour plus de détails sur l'API, voir [DeleteFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.DeleteFunction)la section *Référence des AWS SDK pour Go API*. 

### `GetFunction`
<a name="lambda_GetFunction_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`GetFunction`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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
}
```
+  Pour plus de détails sur l'API, voir [GetFunction](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.GetFunction)la section *Référence des AWS SDK pour Go API*. 

### `Invoke`
<a name="lambda_Invoke_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`Invoke`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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
}
```
+  Pour en savoir plus sur l’API, consultez [Invoke](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.Invoke) dans la *Référence de l’API AWS SDK pour Go *. 

### `ListFunctions`
<a name="lambda_ListFunctions_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`ListFunctions`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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
}
```
+  Pour plus de détails sur l'API, voir [ListFunctions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.ListFunctions)la section *Référence des AWS SDK pour Go API*. 

### `UpdateFunctionCode`
<a name="lambda_UpdateFunctionCode_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`UpdateFunctionCode`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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
}
```
+  Pour plus de détails sur l'API, voir [UpdateFunctionCode](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionCode)la section *Référence des AWS SDK pour Go API*. 

### `UpdateFunctionConfiguration`
<a name="lambda_UpdateFunctionConfiguration_go_2_topic"></a>

L'exemple de code suivant montre comment utiliser`UpdateFunctionConfiguration`.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/lambda#code-examples). 

```
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)
	}
}
```
+  Pour plus de détails sur l'API, voir [UpdateFunctionConfiguration](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/lambda#Client.UpdateFunctionConfiguration)la section *Référence des AWS SDK pour Go API*. 

## Scénarios
<a name="scenarios"></a>

### Confirmation automatique des utilisateurs connus avec une fonction Lambda
<a name="cross_CognitoAutoConfirmUser_go_2_topic"></a>

L’exemple de code suivant illustre comment confirmer automatiquement les utilisateurs Amazon Cognito connus avec une fonction Lambda.
+ Configurez un groupe d’utilisateurs pour appeler une fonction Lambda pour le déclencheur `PreSignUp`.
+ Inscription d’un utilisateur avec Amazon Cognito.
+ La fonction Lambda analyse une table DynamoDB et confirme automatiquement les utilisateurs connus.
+ Connectez-vous en tant que nouvel utilisateur, puis nettoyez les ressources.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples). 
Exécutez un scénario interactif à une invite de commande.  

```
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))
}
```
Gérez le déclencheur `PreSignUp` avec une fonction Lambda.  

```
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)
}
```
Créez une structure qui exécute les tâches courantes.  

```
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))
}
```
Créez une structure qui encapsule les actions Amazon Cognito.  

```
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
}
```
Créez une structure qui encapsule les actions DynamoDB.  

```
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
}
```
Créez une structure qui englobe les actions CloudWatch Logs.  

```
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
}
```
Créez une structure qui englobe les actions. CloudFormation   

```
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
}
```
Nettoyez les ressources.  

```
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!")
	}
}
```
+ Pour plus de détails sur l’API, consultez les rubriques suivantes dans la *Référence des API du kit AWS SDK pour Go *.
  + [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)

### Migration automatique des utilisateurs connus avec une fonction Lambda
<a name="cross_CognitoAutoMigrateUser_go_2_topic"></a>

L’exemple de code suivant illustre comment effectuer automatiquement une migration des utilisateurs Amazon Cognito connus avec une fonction Lambda.
+ Configurez un groupe d’utilisateurs pour appeler une fonction Lambda pour le déclencheur `MigrateUser`.
+ Connectez-vous à Amazon Cognito avec un nom d’utilisateur et une adresse e-mail qui ne figurent pas dans le groupe d’utilisateurs.
+ La fonction Lambda analyse une table DynamoDB et transfère automatiquement les utilisateurs connus vers le groupe d’utilisateurs.
+ Exécutez le flux de mots de passe oubliés pour réinitialiser le mot de passe de l’utilisateur soumis à la migration.
+ Connectez-vous en tant que nouvel utilisateur, puis nettoyez les ressources.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples). 
Exécutez un scénario interactif à une invite de commande.  

```
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))
}
```
Gérez le déclencheur `MigrateUser` avec une fonction Lambda.  

```
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)
}
```
Créez une structure qui exécute les tâches courantes.  

```
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))
}
```
Créez une structure qui encapsule les actions Amazon Cognito.  

```
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
}
```
Créez une structure qui encapsule les actions DynamoDB.  

```
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
}
```
Créez une structure qui englobe les actions CloudWatch Logs.  

```
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
}
```
Créez une structure qui englobe les actions. CloudFormation   

```
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
}
```
Nettoyez les ressources.  

```
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!")
	}
}
```
+ Pour plus de détails sur l’API, consultez les rubriques suivantes dans la *Référence des API du kit AWS SDK pour Go *.
  + [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)

### Rédaction de données d’activité personnalisées à l’aide d’une fonction Lambda après authentification de l’utilisateur Amazon Cognito
<a name="cross_CognitoCustomActivityLog_go_2_topic"></a>

L’exemple de code suivant illustre comment écrire des données d’activité personnalisées avec une fonction Lambda après l’authentification utilisateur Amazon Cognito.
+ Utilisez les fonctions d’administrateur pour ajouter un utilisateur à un groupe d’utilisateurs.
+ Configurez un groupe d’utilisateurs pour appeler une fonction Lambda pour le déclencheur `PostAuthentication`.
+ Inscrivez le nouvel utilisateur dans Amazon Cognito.
+ La fonction Lambda écrit des informations personnalisées dans des CloudWatch journaux et dans une table DynamoDB.
+ Obtenez et affichez les données personnalisées à partir de la table DynamoDB, puis nettoyer les ressources.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le [référentiel d’exemples de code AWS](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/gov2/workflows/user_pools_and_lambda_triggers#code-examples). 
Exécutez un scénario interactif à une invite de commande.  

```
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))
}
```
Gérez le déclencheur `PostAuthentication` avec une fonction Lambda.  

```
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)
}
```
Créez une structure qui exécute les tâches courantes.  

```
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))
}
```
Créez une structure qui encapsule les actions Amazon Cognito.  

```
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
}
```
Créez une structure qui encapsule les actions DynamoDB.  

```
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
}
```
Créez une structure qui englobe les actions CloudWatch Logs.  

```
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
}
```
Créez une structure qui englobe les actions. CloudFormation   

```
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
}
```
Nettoyez les ressources.  

```
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!")
	}
}
```
+ Pour plus de détails sur l’API, consultez les rubriques suivantes dans la *Référence des API du kit AWS SDK pour Go *.
  + [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)

## Exemples sans serveur
<a name="serverless_examples"></a>

### Connexion à une base de données Amazon RDS dans une fonction Lambda
<a name="serverless_connect_RDS_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui se connecte à une base de données RDS. La fonction effectue une simple requête de base de données et renvoie le résultat.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-connect-rds-iam). 
Connexion à une base de données Amazon RDS dans une fonction Lambda à l’aide de Go.  

```
/*
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)
}
```

### Invoquer une fonction Lambda à partir d’un déclencheur Kinesis
<a name="serverless_Kinesis_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par la réception d’enregistrements à partir d’un flux Kinesis. La fonction récupère la charge utile Kinesis, décode à partir de Base64 et enregistre le contenu de l’enregistrement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda). 
Consommation d’un événement Kinesis avec Lambda à l’aide de Go.  

```
// 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)
}
```

### Invocation d’une fonction Lambda à partir d’un déclencheur DynamoDB
<a name="serverless_DynamoDB_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment mettre en œuvre une fonction Lambda qui reçoit un événement déclenché par la réception d’enregistrements à partir d’un flux DynamoDB. La fonction récupère les données utiles DynamoDB et journalise le contenu de l’enregistrement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda). 
Consommation d’un événement DynamoDB avec Lambda en utilisant Go.  

```
// 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)
}
```

### Invocation d’une fonction Lambda à partir d’un déclencheur Amazon DocumentDB
<a name="serverless_DocumentDB_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par la réception d’enregistrements à partir d’un flux de modifications DocumentDB. La fonction récupère les données utiles DocumentDB et journalise le contenu de l’enregistrement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-docdb-to-lambda). 
Consommation d’un événement Amazon DocumentDB avec Lambda en utilisant Go.  

```
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))
}
```

### Invocation d’une fonction Lambda à partir d’un déclencheur Amazon MSK
<a name="serverless_MSK_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par la réception d’enregistrements à partir d’un cluster Amazon MSK. La fonction récupère les données utiles MSK et journalise le contenu de l’enregistrement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-msk-to-lambda). 
Consommation d’un événement Amazon MSK avec Lambda en utilisant Go.  

```
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)
}
```

### Invoquer une fonction lambda à partir d’un déclencheur Amazon S3
<a name="serverless_S3_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par le chargement d’un objet vers un compartiment S3. La fonction extrait le nom du compartiment S3 et la clé de l’objet à partir du paramètre d’événement et appelle l’API Amazon S3 pour récupérer et consigner le type de contenu de l’objet.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-s3-to-lambda). 
Utilisation d’un événement S3 avec Lambda en utilisant Go.  

```
// 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)
}
```

### Invocation d’une fonction lambda à partir d’un déclencheur Amazon SNS
<a name="serverless_SNS_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par la réception de messages à partir d’une rubrique SNS. La fonction extrait les messages du paramètre d’événement et consigne le contenu de chaque message.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sns-to-lambda). 
Consommation d’un événement SNS avec Lambda à l’aide de Go.  

```
// 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)
}
```

### Invoquer une fonction Lambda à partir d’un déclencheur Amazon SQS
<a name="serverless_SQS_Lambda_go_2_topic"></a>

L’exemple de code suivant montre comment implémenter une fonction Lambda qui reçoit un événement déclenché par la réception de messages à partir d’une file d’attente SQS. La fonction extrait les messages du paramètre d’événement et consigne le contenu de chaque message.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-sqs-to-lambda). 
Consommation d’un événement SQS avec Lambda à l’aide de Go.  

```
// 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)
}
```

### Signalement des échecs d’articles par lots pour les fonctions Lambda à l’aide d’un déclencheur Kinesis
<a name="serverless_Kinesis_Lambda_batch_item_failures_go_2_topic"></a>

L’exemple de code suivant montre comment mettre en œuvre une réponse partielle par lots pour les fonctions Lambda qui reçoivent des événements à partir d’un flux Kinesis. La fonction signale les défaillances échecs d’articles par lots dans la réponse, en indiquant à Lambda de réessayer ces messages ultérieurement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-kinesis-to-lambda-with-batch-item-handling). 
Signalement des échecs d’articles par lots Kinesis avec Lambda à l’aide de Go.  

```
// 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)
}
```

### Signalement des échecs d’articles par lots pour les fonctions Lambda à l’aide d’un déclencheur DynamoDB
<a name="serverless_DynamoDB_Lambda_batch_item_failures_go_2_topic"></a>

L’exemple de code suivant montre comment mettre en œuvre une réponse partielle par lots pour les fonctions Lambda qui reçoivent des événements à partir d’un flux DynamoDB. La fonction signale les défaillances échecs d’articles par lots dans la réponse, en indiquant à Lambda de réessayer ces messages ultérieurement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/integration-ddb-to-lambda-with-batch-item-handling). 
Signalement des échecs d’articles par lots DynamoDB avec Lambda à l’aide de Go.  

```
// 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)
}
```

### Signalement des échecs d’articles par lots pour les fonctions Lambda à l’aide d’un déclencheur Amazon SQS
<a name="serverless_SQS_Lambda_batch_item_failures_go_2_topic"></a>

L’exemple de code suivant montre comment mettre en œuvre une réponse partielle par lots pour les fonctions Lambda qui reçoivent des événements à partir d’une file d’attente SQS. La fonction signale les défaillances échecs d’articles par lots dans la réponse, en indiquant à Lambda de réessayer ces messages ultérieurement.

**Kit SDK pour Go V2**  
 Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’[exemples sans serveur](https://github.com/aws-samples/serverless-snippets/tree/main/lambda-function-sqs-report-batch-item-failures). 
Signalement des échecs d’articles par lots SQS avec Lambda à l’aide de Go.  

```
// 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 contributions communautaires
<a name="aws_community_contributions"></a>

### Création et test d’une application sans serveur
<a name="tributary-lite_serverless-application_go_2_topic"></a>

L’exemple de code suivant montre comment créer et tester une application sans serveur à l’aide d’API Gateway avec Lambda et DynamoDB.

**Kit SDK pour Go V2**  
 Illustre comment créer et tester une application sans serveur composée d’une API Gateway avec Lambda et DynamoDB à l’aide du kit SDK Go.   
 Pour obtenir le code source complet et les instructions de configuration et d'exécution, consultez l'exemple complet sur [GitHub](https://github.com/aws-samples/serverless-go-demo).   

**Les services utilisés dans cet exemple**
+ API Gateway
+ DynamoDB
+ Lambda