Erste Schritte mit Amazon RDS — ETL Zero-Integrationen mit Amazon Redshift

import boto3
import time

# Build the client using the default credential configuration.
# You can use the CLI and run 'aws configure' to set access key, secret
# key, and default Region.

rds = boto3.client('rds')
redshift = boto3.client('redshift')
sts = boto3.client('sts')

source_db_name = 'my-source-db' # A name for the source database
source_param_group_name = 'my-source-param-group' # A name for the source parameter group
target_cluster_name = 'my-target-cluster' # A name for the target cluster
target_param_group_name = 'my-target-param-group' # A name for the target parameter group

def create_source_db(*args):
    """Creates a source RDS for MySQL DB instance"""

    response = rds.create_db_parameter_group(
        DBParameterGroupName=source_param_group_name,
        DBParameterGroupFamily='mysql8.0',
        Description='RDS for MySQL zero-ETL integrations'
    )
    print('Created source parameter group: ' + response['DBParameterGroup']['DBParameterGroupName'])

    response = rds.modify_db_parameter_group(
        DBParameterGroupName=source_param_group_name,
        Parameters=[
            {
                'ParameterName': 'binlog_format',
                'ParameterValue': 'ROW',
                'ApplyMethod': 'pending-reboot'
            },
            {
                'ParameterName': 'binlog_row_image',
                'ParameterValue': 'full',
                'ApplyMethod': 'pending-reboot'
            }
        ]
    )
    print('Modified source parameter group: ' + response['DBParameterGroupName'])

    response = rds.create_db_instance(
        DBInstanceIdentifier=source_db_name,
        DBParameterGroupName=source_param_group_name,
        Engine='mysql',
        EngineVersion='8.0.32',
        DBName='mydb',
        DBInstanceClass='db.m5.large',
        AllocatedStorage=15,
        MasterUsername='username',
        MasterUserPassword='Password01**'
    )
    print('Creating source database: ' + response['DBInstance']['DBInstanceIdentifier'])
    source_arn = (response['DBInstance']['DBInstanceArn'])
    create_target_cluster(target_cluster_name, source_arn, target_param_group_name)
    return(response)

def create_target_cluster(target_cluster_name, source_arn, target_param_group_name):
    """Creates a target Redshift cluster"""

    response = redshift.create_cluster_parameter_group(
        ParameterGroupName=target_param_group_name,
        ParameterGroupFamily='redshift-1.0',
        Description='RDS for MySQL zero-ETL integrations'
    )
    print('Created target parameter group: ' + response['ClusterParameterGroup']['ParameterGroupName'])

    response = redshift.modify_cluster_parameter_group(
        ParameterGroupName=target_param_group_name,
        Parameters=[
            {
                'ParameterName': 'enable_case_sensitive_identifier',
                'ParameterValue': 'true'
            }
        ]
    )
    print('Modified target parameter group: ' + response['ParameterGroupName'])

    response = redshift.create_cluster(
        ClusterIdentifier=target_cluster_name,
        NodeType='ra3.4xlarge',
        NumberOfNodes=2,
        Encrypted=True,
        MasterUsername='username',
        MasterUserPassword='Password01**',
        ClusterParameterGroupName=target_param_group_name
    )
    print('Creating target cluster: ' + response['Cluster']['ClusterIdentifier'])
    
    # Retrieve the target cluster ARN
    response = redshift.describe_clusters(
        ClusterIdentifier=target_cluster_name
    )
    target_arn = response['Clusters'][0]['ClusterNamespaceArn']

    # Retrieve the current user's account ID
    response = sts.get_caller_identity()
    account_id = response['Account']

    # Create a resource policy granting access to source database and account ID
    response = redshift.put_resource_policy(
        ResourceArn=target_arn,
        Policy='''
        {
            \"Version\":\"2012-10-17\",
            \"Statement\":[
                {\"Effect\":\"Allow\",
                \"Principal\":{
                    \"Service\":\"redshift.amazonaws.com\"
                },
                \"Action\":[\"redshift:AuthorizeInboundIntegration\"],
                \"Condition\":{
                    \"StringEquals\":{
                        \"aws:SourceArn\":\"%s\"}
                    }
                },
                {\"Effect\":\"Allow\",
                \"Principal\":{
                    \"AWS\":\"arn:aws:iam::%s:root\"},
                \"Action\":\"redshift:CreateInboundIntegration\"}
            ]
        }
        ''' % (source_arn, account_id)
    )
    return(response)

def wait_for_db_availability(*args):
    """Waits for both databases to be available"""

    print('Waiting for source and target to be available...')

    response = rds.describe_db_instances(
        DBInstanceIdentifier=source_db_name
    )
    source_status = response['DBInstances'][0]['DBInstanceStatus']
    source_arn = response['DBInstances'][0]['DBInstanceArn']

    response = redshift.describe_clusters(
        ClusterIdentifier=target_cluster_name
    )
    target_status = response['Clusters'][0]['ClusterStatus']
    target_arn = response['Clusters'][0]['ClusterNamespaceArn']

    # Every 60 seconds, check whether the databases are available
    if source_status != 'available' or target_status != 'available':
        time.sleep(60)
        response = wait_for_db_availability(
            source_db_name, target_cluster_name)
    else:
        print('Databases available. Ready to create zero-ETL integration.')
        create_integration(source_arn, target_arn)
        return

def create_integration(source_arn, target_arn):
    """Creates a zero-ETL integration using the source and target databases"""

    response = rds.create_integration(
        SourceArn=source_arn,
        TargetArn=target_arn,
        IntegrationName='my-integration'
    )
    print('Creating integration: ' + response['IntegrationName'])
    
def main():
    """main function"""
    create_source_db(source_db_name, source_param_group_name)
    wait_for_db_availability(source_db_name, target_cluster_name)

if __name__ == "__main__":
    main()