Aurora examples using SDK for Kotlin

/**
Before running this Kotlin code example, set up your development environment, including your credentials.

For more information, see the following documentation topic:

https://docs.aws.amazon.com/sdk-for-kotlin/latest/developer-guide/setup.html

This example requires an AWS Secrets Manager secret that contains the database credentials. If you do not create a
secret, this example will not work. For more details, see:

https://docs.aws.amazon.com/secretsmanager/latest/userguide/integrating_how-services-use-secrets_RS.html

This Kotlin example performs the following tasks:

1. Returns a list of the available DB engines.
2. Creates a custom DB parameter group.
3. Gets the parameter groups.
4. Gets the parameters in the group.
5. Modifies the auto_increment_increment parameter.
6. Displays the updated parameter value.
7. Gets a list of allowed engine versions.
8. Creates an Aurora DB cluster database.
9. Waits for DB instance to be ready.
10. Gets a list of instance classes available for the selected engine.
11. Creates a database instance in the cluster.
12. Waits for the database instance in the cluster to be ready.
13. Creates a snapshot.
14. Waits for DB snapshot to be ready.
15. Deletes the DB instance.
16. Deletes the DB cluster.
17. Deletes the DB cluster group.
 */

var slTime: Long = 20

suspend fun main(args: Array<String>) {
    val usage = """
        Usage:
            <dbClusterGroupName> <dbParameterGroupFamily> <dbInstanceClusterIdentifier> <dbName> <dbSnapshotIdentifier> <secretName>
        Where:
            dbClusterGroupName - The database group name. 
            dbParameterGroupFamily - The database parameter group name.
            dbInstanceClusterIdentifier - The database instance identifier. 
            dbName -  The database name. 
            dbSnapshotIdentifier - The snapshot identifier.
            secretName - The name of the AWS Secrets Manager secret that contains the database credentials.
    """

    if (args.size != 7) {
        println(usage)
        exitProcess(1)
    }

    val dbClusterGroupName = args[0]
    val dbParameterGroupFamily = args[1]
    val dbInstanceClusterIdentifier = args[2]
    val dbInstanceIdentifier = args[3]
    val dbName = args[4]
    val dbSnapshotIdentifier = args[5]
    val secretName = args[6]

    val gson = Gson()
    val user = gson.fromJson(getSecretValues(secretName).toString(), User::class.java)
    val username = user.username
    val userPassword = user.password

    println("1. Return a list of the available DB engines")
    describeAuroraDBEngines()

    println("2. Create a custom parameter group")
    createDBClusterParameterGroup(dbClusterGroupName, dbParameterGroupFamily)

    println("3. Get the parameter group")
    describeDbClusterParameterGroups(dbClusterGroupName)

    println("4. Get the parameters in the group")
    describeDbClusterParameters(dbClusterGroupName, 0)

    println("5. Modify the auto_increment_offset parameter")
    modifyDBClusterParas(dbClusterGroupName)

    println("6. Display the updated parameter value")
    describeDbClusterParameters(dbClusterGroupName, -1)

    println("7. Get a list of allowed engine versions")
    getAllowedClusterEngines(dbParameterGroupFamily)

    println("8. Create an Aurora DB cluster database")
    val arnClusterVal = createDBCluster(dbClusterGroupName, dbName, dbInstanceClusterIdentifier, username, userPassword)
    println("The ARN of the cluster is $arnClusterVal")

    println("9. Wait for DB instance to be ready")
    waitForClusterInstanceReady(dbInstanceClusterIdentifier)

    println("10. Get a list of instance classes available for the selected engine")
    val instanceClass = getListInstanceClasses()

    println("11. Create a database instance in the cluster.")
    val clusterDBARN = createDBInstanceCluster(dbInstanceIdentifier, dbInstanceClusterIdentifier, instanceClass)
    println("The ARN of the database is $clusterDBARN")

    println("12. Wait for DB instance to be ready")
    waitDBAuroraInstanceReady(dbInstanceIdentifier)

    println("13. Create a snapshot")
    createDBClusterSnapshot(dbInstanceClusterIdentifier, dbSnapshotIdentifier)

    println("14. Wait for DB snapshot to be ready")
    waitSnapshotReady(dbSnapshotIdentifier, dbInstanceClusterIdentifier)

    println("15. Delete the DB instance")
    deleteDBInstance(dbInstanceIdentifier)

    println("16. Delete the DB cluster")
    deleteCluster(dbInstanceClusterIdentifier)

    println("17. Delete the DB cluster group")
    if (clusterDBARN != null) {
        deleteDBClusterGroup(dbClusterGroupName, clusterDBARN)
    }
    println("The Scenario has successfully completed.")
}

@Throws(InterruptedException::class)
suspend fun deleteDBClusterGroup(
    dbClusterGroupName: String,
    clusterDBARN: String,
) {
    var isDataDel = false
    var didFind: Boolean
    var instanceARN: String

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        // Make sure that the database has been deleted.
        while (!isDataDel) {
            val response = rdsClient.describeDbInstances()
            val instanceList = response.dbInstances
            val listSize = instanceList?.size
            isDataDel = false
            didFind = false
            var index = 1
            if (instanceList != null) {
                for (instance in instanceList) {
                    instanceARN = instance.dbInstanceArn.toString()
                    if (instanceARN.compareTo(clusterDBARN) == 0) {
                        println("$clusterDBARN still exists")
                        didFind = true
                    }
                    if (index == listSize && !didFind) {
                        // Went through the entire list and did not find the database ARN.
                        isDataDel = true
                    }
                    delay(slTime * 1000)
                    index++
                }
            }
        }
        val clusterParameterGroupRequest =
            DeleteDbClusterParameterGroupRequest {
                dbClusterParameterGroupName = dbClusterGroupName
            }

        rdsClient.deleteDbClusterParameterGroup(clusterParameterGroupRequest)
        println("$dbClusterGroupName was deleted.")
    }
}

suspend fun deleteCluster(dbInstanceClusterIdentifier: String) {
    val deleteDbClusterRequest =
        DeleteDbClusterRequest {
            dbClusterIdentifier = dbInstanceClusterIdentifier
            skipFinalSnapshot = true
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        rdsClient.deleteDbCluster(deleteDbClusterRequest)
        println("$dbInstanceClusterIdentifier was deleted!")
    }
}

suspend fun deleteDBInstance(dbInstanceIdentifierVal: String) {
    val deleteDbInstanceRequest =
        DeleteDbInstanceRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
            deleteAutomatedBackups = true
            skipFinalSnapshot = true
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.deleteDbInstance(deleteDbInstanceRequest)
        print("The status of the database is ${response.dbInstance?.dbInstanceStatus}")
    }
}

suspend fun waitSnapshotReady(
    dbSnapshotIdentifier: String?,
    dbInstanceClusterIdentifier: String?,
) {
    var snapshotReady = false
    var snapshotReadyStr: String
    println("Waiting for the snapshot to become available.")

    val snapshotsRequest =
        DescribeDbClusterSnapshotsRequest {
            dbClusterSnapshotIdentifier = dbSnapshotIdentifier
            dbClusterIdentifier = dbInstanceClusterIdentifier
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        while (!snapshotReady) {
            val response = rdsClient.describeDbClusterSnapshots(snapshotsRequest)
            val snapshotList = response.dbClusterSnapshots
            if (snapshotList != null) {
                for (snapshot in snapshotList) {
                    snapshotReadyStr = snapshot.status.toString()
                    if (snapshotReadyStr.contains("available")) {
                        snapshotReady = true
                    } else {
                        println(".")
                        delay(slTime * 5000)
                    }
                }
            }
        }
    }
    println("The Snapshot is available!")
}

suspend fun createDBClusterSnapshot(
    dbInstanceClusterIdentifier: String?,
    dbSnapshotIdentifier: String?,
) {
    val snapshotRequest =
        CreateDbClusterSnapshotRequest {
            dbClusterIdentifier = dbInstanceClusterIdentifier
            dbClusterSnapshotIdentifier = dbSnapshotIdentifier
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbClusterSnapshot(snapshotRequest)
        println("The Snapshot ARN is ${response.dbClusterSnapshot?.dbClusterSnapshotArn}")
    }
}

suspend fun waitDBAuroraInstanceReady(dbInstanceIdentifierVal: String?) {
    var instanceReady = false
    var instanceReadyStr: String
    println("Waiting for instance to become available.")
    val instanceRequest =
        DescribeDbInstancesRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
        }

    var endpoint = ""
    RdsClient { region = "us-west-2" }.use { rdsClient ->
        while (!instanceReady) {
            val response = rdsClient.describeDbInstances(instanceRequest)
            response.dbInstances?.forEach { instance ->
                instanceReadyStr = instance.dbInstanceStatus.toString()
                if (instanceReadyStr.contains("available")) {
                    endpoint = instance.endpoint?.address.toString()
                    instanceReady = true
                } else {
                    print(".")
                    delay(sleepTime * 1000)
                }
            }
        }
    }
    println("Database instance is available! The connection endpoint is $endpoint")
}

suspend fun createDBInstanceCluster(
    dbInstanceIdentifierVal: String?,
    dbInstanceClusterIdentifierVal: String?,
    instanceClassVal: String?,
): String? {
    val instanceRequest =
        CreateDbInstanceRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
            dbClusterIdentifier = dbInstanceClusterIdentifierVal
            engine = "aurora-mysql"
            dbInstanceClass = instanceClassVal
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbInstance(instanceRequest)
        print("The status is ${response.dbInstance?.dbInstanceStatus}")
        return response.dbInstance?.dbInstanceArn
    }
}

suspend fun getListInstanceClasses(): String {
    val optionsRequest =
        DescribeOrderableDbInstanceOptionsRequest {
            engine = "aurora-mysql"
            maxRecords = 20
        }
    var instanceClass = ""
    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeOrderableDbInstanceOptions(optionsRequest)
        response.orderableDbInstanceOptions?.forEach { instanceOption ->
            instanceClass = instanceOption.dbInstanceClass.toString()
            println("The instance class is ${instanceOption.dbInstanceClass}")
            println("The engine version is ${instanceOption.engineVersion}")
        }
    }
    return instanceClass
}

// Waits until the database instance is available.
suspend fun waitForClusterInstanceReady(dbClusterIdentifierVal: String?) {
    var instanceReady = false
    var instanceReadyStr: String
    println("Waiting for instance to become available.")

    val instanceRequest =
        DescribeDbClustersRequest {
            dbClusterIdentifier = dbClusterIdentifierVal
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        while (!instanceReady) {
            val response = rdsClient.describeDbClusters(instanceRequest)
            response.dbClusters?.forEach { cluster ->
                instanceReadyStr = cluster.status.toString()
                if (instanceReadyStr.contains("available")) {
                    instanceReady = true
                } else {
                    print(".")
                    delay(sleepTime * 1000)
                }
            }
        }
    }
    println("Database cluster is available!")
}

suspend fun createDBCluster(
    dbParameterGroupFamilyVal: String?,
    dbName: String?,
    dbClusterIdentifierVal: String?,
    userName: String?,
    password: String?,
): String? {
    val clusterRequest =
        CreateDbClusterRequest {
            databaseName = dbName
            dbClusterIdentifier = dbClusterIdentifierVal
            dbClusterParameterGroupName = dbParameterGroupFamilyVal
            engine = "aurora-mysql"
            masterUsername = userName
            masterUserPassword = password
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbCluster(clusterRequest)
        return response.dbCluster?.dbClusterArn
    }
}

// Get a list of allowed engine versions.
suspend fun getAllowedClusterEngines(dbParameterGroupFamilyVal: String?) {
    val versionsRequest =
        DescribeDbEngineVersionsRequest {
            dbParameterGroupFamily = dbParameterGroupFamilyVal
            engine = "aurora-mysql"
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbEngineVersions(versionsRequest)
        response.dbEngineVersions?.forEach { dbEngine ->
            println("The engine version is ${dbEngine.engineVersion}")
            println("The engine description is ${dbEngine.dbEngineDescription}")
        }
    }
}

// Modify the auto_increment_offset parameter.
suspend fun modifyDBClusterParas(dClusterGroupName: String?) {
    val parameter1 =
        Parameter {
            parameterName = "auto_increment_offset"
            applyMethod = ApplyMethod.fromValue("immediate")
            parameterValue = "5"
        }

    val paraList = ArrayList<Parameter>()
    paraList.add(parameter1)
    val groupRequest =
        ModifyDbClusterParameterGroupRequest {
            dbClusterParameterGroupName = dClusterGroupName
            parameters = paraList
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.modifyDbClusterParameterGroup(groupRequest)
        println("The parameter group ${response.dbClusterParameterGroupName} was successfully modified")
    }
}

suspend fun describeDbClusterParameters(
    dbCLusterGroupName: String?,
    flag: Int,
) {
    val dbParameterGroupsRequest: DescribeDbClusterParametersRequest
    dbParameterGroupsRequest =
        if (flag == 0) {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
            }
        } else {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
                source = "user"
            }
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbClusterParameters(dbParameterGroupsRequest)
        response.parameters?.forEach { para ->
            // Only print out information about either auto_increment_offset or auto_increment_increment.
            val paraName = para.parameterName
            if (paraName != null) {
                if (paraName.compareTo("auto_increment_offset") == 0 || paraName.compareTo("auto_increment_increment ") == 0) {
                    println("*** The parameter name is  $paraName")
                    println("*** The parameter value is  ${para.parameterValue}")
                    println("*** The parameter data type is ${para.dataType}")
                    println("*** The parameter description is ${para.description}")
                    println("*** The parameter allowed values  is ${para.allowedValues}")
                }
            }
        }
    }
}

suspend fun describeDbClusterParameterGroups(dbClusterGroupName: String?) {
    val groupsRequest =
        DescribeDbClusterParameterGroupsRequest {
            dbClusterParameterGroupName = dbClusterGroupName
            maxRecords = 20
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbClusterParameterGroups(groupsRequest)
        response.dbClusterParameterGroups?.forEach { group ->
            println("The group name is ${group.dbClusterParameterGroupName}")
            println("The group ARN is ${group.dbClusterParameterGroupArn}")
        }
    }
}

suspend fun createDBClusterParameterGroup(
    dbClusterGroupNameVal: String?,
    dbParameterGroupFamilyVal: String?,
) {
    val groupRequest =
        CreateDbClusterParameterGroupRequest {
            dbClusterParameterGroupName = dbClusterGroupNameVal
            dbParameterGroupFamily = dbParameterGroupFamilyVal
            description = "Created by using the AWS SDK for Kotlin"
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbClusterParameterGroup(groupRequest)
        println("The group name is ${response.dbClusterParameterGroup?.dbClusterParameterGroupName}")
    }
}

suspend fun describeAuroraDBEngines() {
    val engineVersionsRequest =
        DescribeDbEngineVersionsRequest {
            engine = "aurora-mysql"
            defaultOnly = true
            maxRecords = 20
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbEngineVersions(engineVersionsRequest)
        response.dbEngineVersions?.forEach { engineOb ->
            println("The name of the DB parameter group family for the database engine is ${engineOb.dbParameterGroupFamily}")
            println("The name of the database engine ${engineOb.engine}")
            println("The version number of the database engine ${engineOb.engineVersion}")
        }
    }
}

suspend fun createDBCluster(
    dbParameterGroupFamilyVal: String?,
    dbName: String?,
    dbClusterIdentifierVal: String?,
    userName: String?,
    password: String?,
): String? {
    val clusterRequest =
        CreateDbClusterRequest {
            databaseName = dbName
            dbClusterIdentifier = dbClusterIdentifierVal
            dbClusterParameterGroupName = dbParameterGroupFamilyVal
            engine = "aurora-mysql"
            masterUsername = userName
            masterUserPassword = password
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbCluster(clusterRequest)
        return response.dbCluster?.dbClusterArn
    }
}

suspend fun createDBClusterParameterGroup(
    dbClusterGroupNameVal: String?,
    dbParameterGroupFamilyVal: String?,
) {
    val groupRequest =
        CreateDbClusterParameterGroupRequest {
            dbClusterParameterGroupName = dbClusterGroupNameVal
            dbParameterGroupFamily = dbParameterGroupFamilyVal
            description = "Created by using the AWS SDK for Kotlin"
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbClusterParameterGroup(groupRequest)
        println("The group name is ${response.dbClusterParameterGroup?.dbClusterParameterGroupName}")
    }
}

suspend fun createDBClusterSnapshot(
    dbInstanceClusterIdentifier: String?,
    dbSnapshotIdentifier: String?,
) {
    val snapshotRequest =
        CreateDbClusterSnapshotRequest {
            dbClusterIdentifier = dbInstanceClusterIdentifier
            dbClusterSnapshotIdentifier = dbSnapshotIdentifier
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbClusterSnapshot(snapshotRequest)
        println("The Snapshot ARN is ${response.dbClusterSnapshot?.dbClusterSnapshotArn}")
    }
}

suspend fun createDBInstanceCluster(
    dbInstanceIdentifierVal: String?,
    dbInstanceClusterIdentifierVal: String?,
    instanceClassVal: String?,
): String? {
    val instanceRequest =
        CreateDbInstanceRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
            dbClusterIdentifier = dbInstanceClusterIdentifierVal
            engine = "aurora-mysql"
            dbInstanceClass = instanceClassVal
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.createDbInstance(instanceRequest)
        print("The status is ${response.dbInstance?.dbInstanceStatus}")
        return response.dbInstance?.dbInstanceArn
    }
}

suspend fun deleteCluster(dbInstanceClusterIdentifier: String) {
    val deleteDbClusterRequest =
        DeleteDbClusterRequest {
            dbClusterIdentifier = dbInstanceClusterIdentifier
            skipFinalSnapshot = true
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        rdsClient.deleteDbCluster(deleteDbClusterRequest)
        println("$dbInstanceClusterIdentifier was deleted!")
    }
}

@Throws(InterruptedException::class)
suspend fun deleteDBClusterGroup(
    dbClusterGroupName: String,
    clusterDBARN: String,
) {
    var isDataDel = false
    var didFind: Boolean
    var instanceARN: String

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        // Make sure that the database has been deleted.
        while (!isDataDel) {
            val response = rdsClient.describeDbInstances()
            val instanceList = response.dbInstances
            val listSize = instanceList?.size
            isDataDel = false
            didFind = false
            var index = 1
            if (instanceList != null) {
                for (instance in instanceList) {
                    instanceARN = instance.dbInstanceArn.toString()
                    if (instanceARN.compareTo(clusterDBARN) == 0) {
                        println("$clusterDBARN still exists")
                        didFind = true
                    }
                    if (index == listSize && !didFind) {
                        // Went through the entire list and did not find the database ARN.
                        isDataDel = true
                    }
                    delay(slTime * 1000)
                    index++
                }
            }
        }
        val clusterParameterGroupRequest =
            DeleteDbClusterParameterGroupRequest {
                dbClusterParameterGroupName = dbClusterGroupName
            }

        rdsClient.deleteDbClusterParameterGroup(clusterParameterGroupRequest)
        println("$dbClusterGroupName was deleted.")
    }
}

suspend fun deleteDBInstance(dbInstanceIdentifierVal: String) {
    val deleteDbInstanceRequest =
        DeleteDbInstanceRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
            deleteAutomatedBackups = true
            skipFinalSnapshot = true
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.deleteDbInstance(deleteDbInstanceRequest)
        print("The status of the database is ${response.dbInstance?.dbInstanceStatus}")
    }
}

suspend fun describeDbClusterParameterGroups(dbClusterGroupName: String?) {
    val groupsRequest =
        DescribeDbClusterParameterGroupsRequest {
            dbClusterParameterGroupName = dbClusterGroupName
            maxRecords = 20
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbClusterParameterGroups(groupsRequest)
        response.dbClusterParameterGroups?.forEach { group ->
            println("The group name is ${group.dbClusterParameterGroupName}")
            println("The group ARN is ${group.dbClusterParameterGroupArn}")
        }
    }
}

suspend fun describeDbClusterParameters(
    dbCLusterGroupName: String?,
    flag: Int,
) {
    val dbParameterGroupsRequest: DescribeDbClusterParametersRequest
    dbParameterGroupsRequest =
        if (flag == 0) {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
            }
        } else {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
                source = "user"
            }
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbClusterParameters(dbParameterGroupsRequest)
        response.parameters?.forEach { para ->
            // Only print out information about either auto_increment_offset or auto_increment_increment.
            val paraName = para.parameterName
            if (paraName != null) {
                if (paraName.compareTo("auto_increment_offset") == 0 || paraName.compareTo("auto_increment_increment ") == 0) {
                    println("*** The parameter name is  $paraName")
                    println("*** The parameter value is  ${para.parameterValue}")
                    println("*** The parameter data type is ${para.dataType}")
                    println("*** The parameter description is ${para.description}")
                    println("*** The parameter allowed values  is ${para.allowedValues}")
                }
            }
        }
    }
}

suspend fun waitSnapshotReady(
    dbSnapshotIdentifier: String?,
    dbInstanceClusterIdentifier: String?,
) {
    var snapshotReady = false
    var snapshotReadyStr: String
    println("Waiting for the snapshot to become available.")

    val snapshotsRequest =
        DescribeDbClusterSnapshotsRequest {
            dbClusterSnapshotIdentifier = dbSnapshotIdentifier
            dbClusterIdentifier = dbInstanceClusterIdentifier
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        while (!snapshotReady) {
            val response = rdsClient.describeDbClusterSnapshots(snapshotsRequest)
            val snapshotList = response.dbClusterSnapshots
            if (snapshotList != null) {
                for (snapshot in snapshotList) {
                    snapshotReadyStr = snapshot.status.toString()
                    if (snapshotReadyStr.contains("available")) {
                        snapshotReady = true
                    } else {
                        println(".")
                        delay(slTime * 5000)
                    }
                }
            }
        }
    }
    println("The Snapshot is available!")
}

suspend fun describeDbClusterParameters(
    dbCLusterGroupName: String?,
    flag: Int,
) {
    val dbParameterGroupsRequest: DescribeDbClusterParametersRequest
    dbParameterGroupsRequest =
        if (flag == 0) {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
            }
        } else {
            DescribeDbClusterParametersRequest {
                dbClusterParameterGroupName = dbCLusterGroupName
                source = "user"
            }
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbClusterParameters(dbParameterGroupsRequest)
        response.parameters?.forEach { para ->
            // Only print out information about either auto_increment_offset or auto_increment_increment.
            val paraName = para.parameterName
            if (paraName != null) {
                if (paraName.compareTo("auto_increment_offset") == 0 || paraName.compareTo("auto_increment_increment ") == 0) {
                    println("*** The parameter name is  $paraName")
                    println("*** The parameter value is  ${para.parameterValue}")
                    println("*** The parameter data type is ${para.dataType}")
                    println("*** The parameter description is ${para.description}")
                    println("*** The parameter allowed values  is ${para.allowedValues}")
                }
            }
        }
    }
}

// Get a list of allowed engine versions.
suspend fun getAllowedClusterEngines(dbParameterGroupFamilyVal: String?) {
    val versionsRequest =
        DescribeDbEngineVersionsRequest {
            dbParameterGroupFamily = dbParameterGroupFamilyVal
            engine = "aurora-mysql"
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.describeDbEngineVersions(versionsRequest)
        response.dbEngineVersions?.forEach { dbEngine ->
            println("The engine version is ${dbEngine.engineVersion}")
            println("The engine description is ${dbEngine.dbEngineDescription}")
        }
    }
}

suspend fun waitDBAuroraInstanceReady(dbInstanceIdentifierVal: String?) {
    var instanceReady = false
    var instanceReadyStr: String
    println("Waiting for instance to become available.")
    val instanceRequest =
        DescribeDbInstancesRequest {
            dbInstanceIdentifier = dbInstanceIdentifierVal
        }

    var endpoint = ""
    RdsClient { region = "us-west-2" }.use { rdsClient ->
        while (!instanceReady) {
            val response = rdsClient.describeDbInstances(instanceRequest)
            response.dbInstances?.forEach { instance ->
                instanceReadyStr = instance.dbInstanceStatus.toString()
                if (instanceReadyStr.contains("available")) {
                    endpoint = instance.endpoint?.address.toString()
                    instanceReady = true
                } else {
                    print(".")
                    delay(sleepTime * 1000)
                }
            }
        }
    }
    println("Database instance is available! The connection endpoint is $endpoint")
}

// Modify the auto_increment_offset parameter.
suspend fun modifyDBClusterParas(dClusterGroupName: String?) {
    val parameter1 =
        Parameter {
            parameterName = "auto_increment_offset"
            applyMethod = ApplyMethod.fromValue("immediate")
            parameterValue = "5"
        }

    val paraList = ArrayList<Parameter>()
    paraList.add(parameter1)
    val groupRequest =
        ModifyDbClusterParameterGroupRequest {
            dbClusterParameterGroupName = dClusterGroupName
            parameters = paraList
        }

    RdsClient { region = "us-west-2" }.use { rdsClient ->
        val response = rdsClient.modifyDbClusterParameterGroup(groupRequest)
        println("The parameter group ${response.dbClusterParameterGroupName} was successfully modified")
    }
}

Shows how to create a web application that tracks and reports on work items stored in an Amazon RDS database.

For complete source code and instructions on how to set up a Spring REST API that queries Amazon Aurora Serverless data and for use by a React application, see the full example on GitHub.