使用適用於 Python 的 SDK (Boto3) 的 Neptune 範例

import boto3
from botocore.exceptions import ClientError


def describe_db_clusters(neptune_client):
    """
    Describes the Amazon Neptune DB clusters using a paginator to handle multiple pages.
    Raises ClientError with 'ResourceNotFoundException' if no clusters are found.
    """
    paginator = neptune_client.get_paginator("describe_db_clusters")
    clusters_found = False

    for page in paginator.paginate():
        for cluster in page.get("DBClusters", []):
            clusters_found = True
            print(f"Cluster Identifier: {cluster['DBClusterIdentifier']}")
            print(f"Status: {cluster['Status']}")

    if not clusters_found:
        raise ClientError(
            {
                "Error": {
                    "Code": "ResourceNotFoundException",
                    "Message": "No Neptune DB clusters found."
                }
            },
            operation_name="DescribeDBClusters"
        )

def main():
    """
    Main entry point: creates the Neptune client and calls the describe operation.
    """
    neptune_client = boto3.client("neptune")
    try:
        describe_db_clusters(neptune_client)
    except ClientError as e:
        error_code = e.response["Error"]["Code"]
        if error_code == "ResourceNotFoundException":
            print(f"Resource not found: {e.response['Error']['Message']}")
        else:
            print(f"Unexpected ClientError: {e.response['Error']['Message']}")
    except Exception as e:
        print(f"Unexpected error: {str(e)}")

if __name__ == "__main__":
    main()

import boto3
import time
from botocore.exceptions import ClientError

# Constants used in this scenario
POLL_INTERVAL_SECONDS = 10
TIMEOUT_SECONDS = 1200  # 20 minutes

def delete_db_cluster(neptune_client, cluster_id: str):
    """
    Deletes a Neptune DB cluster and throws exceptions to the caller.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        cluster_id (str): The ID of the Neptune DB cluster to be deleted.

    Raises:
        ClientError: If the delete operation fails.
    """
    request = {
        'DBClusterIdentifier': cluster_id,
        'SkipFinalSnapshot': True
    }

    try:
        print(f"Deleting DB Cluster: {cluster_id}")
        neptune_client.delete_db_cluster(**request)

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBClusterNotFoundFault":
            print(f"Cluster '{cluster_id}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete DB cluster. {code}: {message}")
        raise

def format_elapsed_time(seconds: int) -> str:
    mins, secs = divmod(seconds, 60)
    hours, mins = divmod(mins, 60)
    return f"{hours:02}:{mins:02}:{secs:02}"


def delete_db_instance(neptune_client, instance_id: str):
    """
    Deletes a Neptune DB instance and waits for its deletion to complete.
    Raises exception to be handled by calling code.
    """
    print(f"Initiating deletion of DB Instance: {instance_id}")
    try:
        neptune_client.delete_db_instance(
            DBInstanceIdentifier=instance_id,
            SkipFinalSnapshot=True
        )

        print(f"Waiting for DB Instance '{instance_id}' to be deleted...")
        waiter = neptune_client.get_waiter('db_instance_deleted')
        waiter.wait(
            DBInstanceIdentifier=instance_id,
            WaiterConfig={
                'Delay': 30,
                'MaxAttempts': 40
            }
        )

        print(f"DB Instance '{instance_id}' successfully deleted.")

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBInstanceNotFoundFault":
            print(f"Instance '{instance_id}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete DB instance. {code}: {message}")
        raise

def delete_db_subnet_group(neptune_client, subnet_group_name):
    """
    Deletes a Neptune DB subnet group synchronously using Boto3.

    Args:
        neptune_client (boto3.client): The Neptune client.
        subnet_group_name (str): The name of the DB subnet group to delete.

    Raises:
        ClientError: If the delete operation fails.
    """
    delete_group_request = {
        'DBSubnetGroupName': subnet_group_name
    }

    try:
        neptune_client.delete_db_subnet_group(**delete_group_request)
        print(f"️ Deleting Subnet Group: {subnet_group_name}")

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBSubnetGroupNotFoundFault":
            print(f"Subnet group '{subnet_group_name}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete subnet group. {code}: {message}")
        raise

def wait_for_cluster_status(
        neptune_client,
        cluster_id: str,
        desired_status: str,
        timeout_seconds: int = TIMEOUT_SECONDS,
        poll_interval_seconds: int = POLL_INTERVAL_SECONDS
):
    """
    Waits for a Neptune DB cluster to reach a desired status.

    Args:
        neptune_client (boto3.client): The Amazon Neptune client.
        cluster_id (str): The identifier of the Neptune DB cluster.
        desired_status (str): The target status (e.g., "available", "stopped").
        timeout_seconds (int): Max time to wait in seconds (default: 1200).
        poll_interval_seconds (int): Polling interval in seconds (default: 10).

    Raises:
        RuntimeError: If the desired status is not reached before timeout.
    """
    print(f"Waiting for cluster '{cluster_id}' to reach status '{desired_status}'...")
    start_time = time.time()

    while True:
        # Prepare request object
        describe_cluster_request = {
            'DBClusterIdentifier': cluster_id
        }

        # Call the Neptune API
        response = neptune_client.describe_db_clusters(**describe_cluster_request)
        clusters = response.get('DBClusters', [])
        current_status = clusters[0].get('Status') if clusters else None
        elapsed_seconds = int(time.time() - start_time)

        status_str = current_status if current_status else "Unknown"
        print(
            f"\r Elapsed: {format_elapsed_time(elapsed_seconds):<20}  Cluster status: {status_str:<20}",
            end="", flush=True
        )

        if current_status and current_status.lower() == desired_status.lower():
            print(
                f"\nNeptune cluster reached desired status '{desired_status}' after {format_elapsed_time(elapsed_seconds)}."
            )
            return

        if elapsed_seconds > timeout_seconds:
            raise RuntimeError(f"Timeout waiting for Neptune cluster to reach status: {desired_status}")

        time.sleep(poll_interval_seconds)


def start_db_cluster(neptune_client, cluster_identifier: str):
    """
    Starts an Amazon Neptune DB cluster and waits until it reaches 'available'.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_identifier (str): The DB cluster identifier.

    Raises:
        ClientError: Propagates AWS API issues like resource not found.
        RuntimeError: If cluster doesn't reach 'available' within timeout.
    """
    try:
        # Initial wait in case the cluster was just stopped
        time.sleep(30)
        neptune_client.start_db_cluster(DBClusterIdentifier=cluster_identifier)
    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't start DB cluster. Here's why: {code}: {message}")
        raise

    start_time = time.time()
    paginator = neptune_client.get_paginator('describe_db_clusters')

    while True:
        try:
            pages = paginator.paginate(DBClusterIdentifier=cluster_identifier)
            clusters = []
            for page in pages:
                clusters.extend(page.get('DBClusters', []))
        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBClusterNotFound":
                print(f"Cluster '{cluster_identifier}' not found while polling. It may have been deleted.")
            else:
                print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
            raise

        status = clusters[0].get('Status') if clusters else None
        elapsed = time.time() - start_time

        print(f"\rElapsed: {int(elapsed)}s – Cluster status: {status}", end="", flush=True)

        if status and status.lower() == 'available':
            print(f"\n🎉 Cluster '{cluster_identifier}' is available.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for cluster '{cluster_identifier}' to become available.")

        time.sleep(POLL_INTERVAL_SECONDS)


def stop_db_cluster(neptune_client, cluster_identifier: str):
    """
    Stops an Amazon Neptune DB cluster and waits until it's fully stopped.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_identifier (str): The DB cluster identifier.

    Raises:
        ClientError: For AWS API errors (e.g., resource not found).
        RuntimeError: If the cluster doesn't stop within the timeout.
    """
    try:
        neptune_client.stop_db_cluster(DBClusterIdentifier=cluster_identifier)
    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't stop DB cluster. Here's why: {code}: {message}")
        raise

    start_time = time.time()
    paginator = neptune_client.get_paginator('describe_db_clusters')

    while True:
        try:
            pages = paginator.paginate(DBClusterIdentifier=cluster_identifier)
            clusters = []
            for page in pages:
                clusters.extend(page.get('DBClusters', []))
        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBClusterNotFound":
                print(f"Cluster '{cluster_identifier}' not found while polling. It may have been deleted.")
            else:
                print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
            raise

        status = clusters[0].get('Status') if clusters else None
        elapsed = time.time() - start_time

        print(f"\rElapsed: {int(elapsed)}s – Cluster status: {status}", end="", flush=True)

        if status and status.lower() == 'stopped':
            print(f"\nCluster '{cluster_identifier}' is now stopped.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for cluster '{cluster_identifier}' to stop.")

        time.sleep(POLL_INTERVAL_SECONDS)



def describe_db_clusters(neptune_client, cluster_id: str):
    """
    Describes details of a Neptune DB cluster, paginating if needed.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_id (str): The ID of the cluster to describe.

    Raises:
        ClientError: If there's an AWS API error (e.g., cluster not found).
    """
    paginator = neptune_client.get_paginator('describe_db_clusters')

    try:
        pages = paginator.paginate(DBClusterIdentifier=cluster_id)

        found = False
        for page in pages:
            for cluster in page.get('DBClusters', []):
                found = True
                print(f"Cluster Identifier: {cluster.get('DBClusterIdentifier')}")
                print(f"Status: {cluster.get('Status')}")
                print(f"Engine: {cluster.get('Engine')}")
                print(f"Engine Version: {cluster.get('EngineVersion')}")
                print(f"Endpoint: {cluster.get('Endpoint')}")
                print(f"Reader Endpoint: {cluster.get('ReaderEndpoint')}")
                print(f"Availability Zones: {cluster.get('AvailabilityZones')}")
                print(f"Subnet Group: {cluster.get('DBSubnetGroup')}")
                print("VPC Security Groups:")
                for vpc_group in cluster.get('VpcSecurityGroups', []):
                    print(f"  - {vpc_group.get('VpcSecurityGroupId')}")
                print(f"Storage Encrypted: {cluster.get('StorageEncrypted')}")
                print(f"IAM Auth Enabled: {cluster.get('IAMDatabaseAuthenticationEnabled')}")
                print(f"Backup Retention Period: {cluster.get('BackupRetentionPeriod')} days")
                print(f"Preferred Backup Window: {cluster.get('PreferredBackupWindow')}")
                print(f"Preferred Maintenance Window: {cluster.get('PreferredMaintenanceWindow')}")
                print("------")

        if not found:
            # Treat empty response as cluster not found
            raise ClientError(
                {"Error": {"Code": "DBClusterNotFound", "Message": f"No cluster found with ID '{cluster_id}'"}},
                "DescribeDBClusters"
            )

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        elif code == "DBClusterNotFound":
            print(f"Cluster '{cluster_id}' not found. Please verify the cluster ID.")
        else:
            print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
        raise

def check_instance_status(neptune_client, instance_id: str, desired_status: str):
    """
    Polls the status of a Neptune DB instance until it reaches desired_status.
    Uses pagination via describe_db_instances — even for a single instance.

    Raises:
      ClientError: If describe_db_instances fails (e.g., instance not found).
      RuntimeError: If timeout expires before reaching desired status.
    """
    paginator = neptune_client.get_paginator('describe_db_instances')
    start_time = time.time()

    while True:
        try:
            pages = paginator.paginate(DBInstanceIdentifier=instance_id)
            instances = []
            for page in pages:
                instances.extend(page.get('DBInstances', []))

        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBInstanceNotFound":
                print(f"Instance '{instance_id}' not found. Please verify the instance ID.")
            else:
                print(f"Failed to describe DB instance. {code}: {message}")
            raise

        current_status = instances[0].get('DBInstanceStatus') if instances else None
        elapsed = int(time.time() - start_time)

        print(f"\rElapsed: {format_elapsed_time(elapsed)}  Status: {current_status}", end="", flush=True)

        if current_status and current_status.lower() == desired_status.lower():
            print(f"\nInstance '{instance_id}' reached '{desired_status}' in {format_elapsed_time(elapsed)}.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for '{instance_id}' to reach '{desired_status}'")

        time.sleep(POLL_INTERVAL_SECONDS)


def create_db_instance(neptune_client, db_instance_id: str, db_cluster_id: str) -> str:
    try:
        request = {
            'DBInstanceIdentifier': db_instance_id,
            'DBInstanceClass': 'db.r5.large',
            'Engine': 'neptune',
            'DBClusterIdentifier': db_cluster_id
        }

        print(f"Creating Neptune DB Instance: {db_instance_id}")
        response = neptune_client.create_db_instance(**request)

        instance = response.get('DBInstance')
        if not instance or 'DBInstanceIdentifier' not in instance:
            raise RuntimeError("Instance creation succeeded but no ID returned.")

        print(f"Waiting for DB Instance '{db_instance_id}' to become available...")
        waiter = neptune_client.get_waiter('db_instance_available')
        waiter.wait(
            DBInstanceIdentifier=db_instance_id,
            WaiterConfig={'Delay': 30, 'MaxAttempts': 40}
        )

        print(f"DB Instance '{db_instance_id}' is now available.")
        return instance['DBInstanceIdentifier']

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't create DB instance. Here's why: {code}: {message}")
        raise

    except Exception as e:
        print(f"Unexpected error creating DB instance '{db_instance_id}': {e}")
        raise RuntimeError(f"Unexpected error creating DB instance '{db_instance_id}': {e}") from e


def create_db_cluster(neptune_client, db_name: str) -> str:
    """
    Creates a Neptune DB cluster and returns its identifier.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        db_name (str): The desired cluster identifier.

    Returns:
        str: The DB cluster identifier.

    Raises:
        RuntimeError: For any failure or AWS error, with a user-friendly message.
    """
    request = {
        'DBClusterIdentifier': db_name,
        'Engine': 'neptune',
        'DeletionProtection': False,
        'BackupRetentionPeriod': 1
    }

    try:
        response = neptune_client.create_db_cluster(**request)
        cluster = response.get('DBCluster') or {}

        cluster_id = cluster.get('DBClusterIdentifier')
        if not cluster_id:
            raise RuntimeError("Cluster created but no ID returned.")

        print(f"DB Cluster created: {cluster_id}")
        return cluster_id

    except ClientError as e:
        code = e.response["Error"]["Code"]
        message = e.response["Error"]["Message"]

        if code in ("ServiceQuotaExceededException", "DBClusterQuotaExceededFault"):
            raise RuntimeError("You have exceeded the quota for Neptune DB clusters.") from e
        else:
            raise RuntimeError(f"AWS error [{code}]: {message}") from e

    except Exception as e:
        raise RuntimeError(f"Unexpected error creating DB cluster '{db_name}': {e}") from e

def get_subnet_ids(vpc_id: str) -> list[str]:
    ec2_client = boto3.client('ec2')

    describe_subnets_request = {
        'Filters': [{'Name': 'vpc-id', 'Values': [vpc_id]}]
    }

    response = ec2_client.describe_subnets(**describe_subnets_request)
    subnets = response.get('Subnets', [])
    subnet_ids = [subnet['SubnetId'] for subnet in subnets if 'SubnetId' in subnet]
    return subnet_ids


def get_default_vpc_id() -> str:
    ec2_client = boto3.client('ec2')
    describe_vpcs_request = {
        'Filters': [{'Name': 'isDefault', 'Values': ['true']}]
    }

    response = ec2_client.describe_vpcs(**describe_vpcs_request)
    vpcs = response.get('Vpcs', [])
    if not vpcs:
        raise RuntimeError("No default VPC found in this region.")

    default_vpc_id = vpcs[0]['VpcId']
    print(f"Default VPC ID: {default_vpc_id}")
    return default_vpc_id


def create_subnet_group(neptune_client, group_name: str):
    """
    Creates a Neptune DB subnet group and returns its name and ARN.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        group_name (str): The desired name of the subnet group.

    Returns:
        tuple(str, str): (subnet_group_name, subnet_group_arn)

    Raises:
        RuntimeError: For quota errors or other AWS-related failures.
    """
    vpc_id = get_default_vpc_id()
    subnet_ids = get_subnet_ids(vpc_id)

    request = {
        'DBSubnetGroupName': group_name,
        'DBSubnetGroupDescription': 'My Neptune subnet group',
        'SubnetIds': subnet_ids,
        'Tags': [{'Key': 'Environment', 'Value': 'Dev'}]
    }

    try:
        response = neptune_client.create_db_subnet_group(**request)
        sg = response.get("DBSubnetGroup", {})
        name = sg.get("DBSubnetGroupName")
        arn = sg.get("DBSubnetGroupArn")

        if not name or not arn:
            raise RuntimeError("Response missing subnet group name or ARN.")

        print(f"Subnet group created: {name}")
        print(f"ARN: {arn}")
        return name, arn

    except ClientError as e:
        code = e.response["Error"]["Code"]
        msg = e.response["Error"]["Message"]

        if code == "ServiceQuotaExceededException":
            print("Subnet group quota exceeded.")
            raise RuntimeError("Subnet group quota exceeded.") from e
        else:
            print(f"AWS error [{code}]: {msg}")
            raise RuntimeError(f"AWS error [{code}]: {msg}") from e

    except Exception as e:
        print(f"Unexpected error creating subnet group '{group_name}': {e}")
        raise RuntimeError(f"Unexpected error creating subnet group '{group_name}': {e}") from e

def wait_for_input_to_continue():
    input("\nPress <ENTER> to continue...")
    print("Continuing with the program...\n")


def run_scenario(neptune_client, subnet_group_name: str, db_instance_id: str, cluster_name: str):
    print("-" * 88)
    print("1. Create a Neptune DB Subnet Group")
    wait_for_input_to_continue()

    try:
        name, arn = create_subnet_group(neptune_client, subnet_group_name)
        print(f"Subnet group successfully created: {name}")

        print("-" * 88)
        print("2. Create a Neptune Cluster")
        wait_for_input_to_continue()
        db_cluster_id = create_db_cluster(neptune_client, cluster_name)

        print("-" * 88)
        print("3. Create a Neptune DB Instance")
        wait_for_input_to_continue()
        create_db_instance(neptune_client, db_instance_id, cluster_name)

        print("-" * 88)
        print("4. Check the status of the Neptune DB Instance")
        print("""
        Even though you're targeting a single DB instance, 
        describe_db_instances supports pagination and can return multiple pages. 

        Handling paginated responses ensures your method continues to work reliably 
        even if AWS returns large or paged results.
        """)
        wait_for_input_to_continue()
        check_instance_status(neptune_client, db_instance_id, "available")

        print("-" * 88)
        print("5. Show Neptune Cluster details")
        wait_for_input_to_continue()
        describe_db_clusters(neptune_client, db_cluster_id)

        print("-" * 88)
        print("6. Stop the Amazon Neptune cluster")
        print("""
            Boto3 doesn't currently offer a 
            built-in waiter for stop_db_cluster, 
            This example implements a custom polling 
            strategy until the cluster is in a stopped state.
        """)
        wait_for_input_to_continue()
        stop_db_cluster(neptune_client, db_cluster_id)
        check_instance_status(neptune_client, db_instance_id, "stopped")

        print("-" * 88)
        print("7. Start the Amazon Neptune cluster")
        print("""
            Boto3 doesn't currently offer a 
            built-in waiter for start_db_cluster, 
            This example implements a custom polling 
            strategy until the cluster is in an available state.
        """)
        wait_for_input_to_continue()
        start_db_cluster(neptune_client, db_cluster_id)
        wait_for_cluster_status(neptune_client, db_cluster_id, "available")
        check_instance_status(neptune_client, db_instance_id, "available")

        print("All Neptune resources are now available.")
        print("-" * 88)

        print("-" * 88)
        print("8. Delete the Neptune Assets")
        print("Would you like to delete the Neptune Assets? (y/n)")
        del_ans = input().strip().lower()

        if del_ans == "y":
            print("You selected to delete the Neptune assets.")

            delete_db_instance(neptune_client, db_instance_id)
            delete_db_cluster(neptune_client, db_cluster_id)
            delete_db_subnet_group(neptune_client, subnet_group_name)

            print("Neptune resources deleted successfully")

    except ClientError as ce:
        code = ce.response["Error"]["Code"]

        if code in ("DBInstanceNotFound", "DBInstanceNotFoundFault", "ResourceNotFound"):
            print(f"Instance '{db_instance_id}' not found.")
        elif code in ("DBClusterNotFound", "DBClusterNotFoundFault", "ResourceNotFoundFault"):
            print(f"Cluster '{cluster_name}' not found.")
        elif code == "DBSubnetGroupNotFoundFault":
            print(f"Subnet group '{subnet_group_name}' not found.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"AWS error [{code}]: {ce.response['Error']['Message']}")
            raise  # re-raise unexpected errors

    except RuntimeError as re:
        print(f"Runtime error or timeout: {re}")


def main():
    neptune_client = boto3.client('neptune')

    # Customize the following names to match your Neptune setup
    # (You must change these to unique values for your environment)
    subnet_group_name = "neptuneSubnetGroup111"
    cluster_name = "neptuneCluster111"
    db_instance_id = "neptuneDB111"

    print("""
    Amazon Neptune is a fully managed graph database service by AWS...
    Let's get started!
    """)
    wait_for_input_to_continue()
    run_scenario(neptune_client, subnet_group_name, db_instance_id, cluster_name)

    print("""
    Thank you for checking out the Amazon Neptune Service Use demo.
    For more AWS code examples, visit:
    https://docs.aws.amazon.com/code-library/latest/ug/what-is-code-library.html
    """)

if __name__ == "__main__":
    main()

def create_db_cluster(neptune_client, db_name: str) -> str:
    """
    Creates a Neptune DB cluster and returns its identifier.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        db_name (str): The desired cluster identifier.

    Returns:
        str: The DB cluster identifier.

    Raises:
        RuntimeError: For any failure or AWS error, with a user-friendly message.
    """
    request = {
        'DBClusterIdentifier': db_name,
        'Engine': 'neptune',
        'DeletionProtection': False,
        'BackupRetentionPeriod': 1
    }

    try:
        response = neptune_client.create_db_cluster(**request)
        cluster = response.get('DBCluster') or {}

        cluster_id = cluster.get('DBClusterIdentifier')
        if not cluster_id:
            raise RuntimeError("Cluster created but no ID returned.")

        print(f"DB Cluster created: {cluster_id}")
        return cluster_id

    except ClientError as e:
        code = e.response["Error"]["Code"]
        message = e.response["Error"]["Message"]

        if code in ("ServiceQuotaExceededException", "DBClusterQuotaExceededFault"):
            raise RuntimeError("You have exceeded the quota for Neptune DB clusters.") from e
        else:
            raise RuntimeError(f"AWS error [{code}]: {message}") from e

    except Exception as e:
        raise RuntimeError(f"Unexpected error creating DB cluster '{db_name}': {e}") from e

def create_db_instance(neptune_client, db_instance_id: str, db_cluster_id: str) -> str:
    try:
        request = {
            'DBInstanceIdentifier': db_instance_id,
            'DBInstanceClass': 'db.r5.large',
            'Engine': 'neptune',
            'DBClusterIdentifier': db_cluster_id
        }

        print(f"Creating Neptune DB Instance: {db_instance_id}")
        response = neptune_client.create_db_instance(**request)

        instance = response.get('DBInstance')
        if not instance or 'DBInstanceIdentifier' not in instance:
            raise RuntimeError("Instance creation succeeded but no ID returned.")

        print(f"Waiting for DB Instance '{db_instance_id}' to become available...")
        waiter = neptune_client.get_waiter('db_instance_available')
        waiter.wait(
            DBInstanceIdentifier=db_instance_id,
            WaiterConfig={'Delay': 30, 'MaxAttempts': 40}
        )

        print(f"DB Instance '{db_instance_id}' is now available.")
        return instance['DBInstanceIdentifier']

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't create DB instance. Here's why: {code}: {message}")
        raise

    except Exception as e:
        print(f"Unexpected error creating DB instance '{db_instance_id}': {e}")
        raise RuntimeError(f"Unexpected error creating DB instance '{db_instance_id}': {e}") from e

def create_subnet_group(neptune_client, group_name: str):
    """
    Creates a Neptune DB subnet group and returns its name and ARN.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        group_name (str): The desired name of the subnet group.

    Returns:
        tuple(str, str): (subnet_group_name, subnet_group_arn)

    Raises:
        RuntimeError: For quota errors or other AWS-related failures.
    """
    vpc_id = get_default_vpc_id()
    subnet_ids = get_subnet_ids(vpc_id)

    request = {
        'DBSubnetGroupName': group_name,
        'DBSubnetGroupDescription': 'My Neptune subnet group',
        'SubnetIds': subnet_ids,
        'Tags': [{'Key': 'Environment', 'Value': 'Dev'}]
    }

    try:
        response = neptune_client.create_db_subnet_group(**request)
        sg = response.get("DBSubnetGroup", {})
        name = sg.get("DBSubnetGroupName")
        arn = sg.get("DBSubnetGroupArn")

        if not name or not arn:
            raise RuntimeError("Response missing subnet group name or ARN.")

        print(f"Subnet group created: {name}")
        print(f"ARN: {arn}")
        return name, arn

    except ClientError as e:
        code = e.response["Error"]["Code"]
        msg = e.response["Error"]["Message"]

        if code == "ServiceQuotaExceededException":
            print("Subnet group quota exceeded.")
            raise RuntimeError("Subnet group quota exceeded.") from e
        else:
            print(f"AWS error [{code}]: {msg}")
            raise RuntimeError(f"AWS error [{code}]: {msg}") from e

    except Exception as e:
        print(f"Unexpected error creating subnet group '{group_name}': {e}")
        raise RuntimeError(f"Unexpected error creating subnet group '{group_name}': {e}") from e

"""
Running this example.

----------------------------------------------------------------------------------
VPC Networking Requirement:
----------------------------------------------------------------------------------
Amazon Neptune must be accessed from **within the same VPC** as the Neptune cluster.
It does not expose a public endpoint, so this code must be executed from:

  - An **AWS Lambda function** configured to run inside the same VPC
  - An **EC2 instance** or **ECS task** running in the same VPC
  - A connected environment such as a **VPN**, **AWS Direct Connect**, or a **peered VPC**

"""

GRAPH_NAME = "sample-analytics-graph"

def main():
    config = Config(retries={"total_max_attempts": 1, "mode": "standard"}, read_timeout=None)
    client = boto3.client("neptune-graph", config=config)
    execute_create_graph(client, GRAPH_NAME)

def execute_create_graph(client, graph_name):
    try:
        print("Creating Neptune graph...")
        response = client.create_graph(
            graphName=graph_name,
            provisionedMemory = 16
        )

        created_graph_name = response.get("name")
        graph_arn = response.get("arn")
        graph_endpoint = response.get("endpoint")

        print("Graph created successfully!")
        print(f"Graph Name: {created_graph_name}")
        print(f"Graph ARN: {graph_arn}")
        print(f"Graph Endpoint: {graph_endpoint}")

    except ClientError as e:
        print(f"Failed to create graph: {e.response['Error']['Message']}")
    except BotoCoreError as e:
        print(f"Failed to create graph: {str(e)}")
    except Exception as e:
        print(f"Unexpected error: {str(e)}")

if __name__ == "__main__":
    main()

def delete_db_cluster(neptune_client, cluster_id: str):
    """
    Deletes a Neptune DB cluster and throws exceptions to the caller.

    Args:
        neptune_client (boto3.client): The Neptune client object.
        cluster_id (str): The ID of the Neptune DB cluster to be deleted.

    Raises:
        ClientError: If the delete operation fails.
    """
    request = {
        'DBClusterIdentifier': cluster_id,
        'SkipFinalSnapshot': True
    }

    try:
        print(f"Deleting DB Cluster: {cluster_id}")
        neptune_client.delete_db_cluster(**request)

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBClusterNotFoundFault":
            print(f"Cluster '{cluster_id}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete DB cluster. {code}: {message}")
        raise

def delete_db_instance(neptune_client, instance_id: str):
    """
    Deletes a Neptune DB instance and waits for its deletion to complete.
    Raises exception to be handled by calling code.
    """
    print(f"Initiating deletion of DB Instance: {instance_id}")
    try:
        neptune_client.delete_db_instance(
            DBInstanceIdentifier=instance_id,
            SkipFinalSnapshot=True
        )

        print(f"Waiting for DB Instance '{instance_id}' to be deleted...")
        waiter = neptune_client.get_waiter('db_instance_deleted')
        waiter.wait(
            DBInstanceIdentifier=instance_id,
            WaiterConfig={
                'Delay': 30,
                'MaxAttempts': 40
            }
        )

        print(f"DB Instance '{instance_id}' successfully deleted.")

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBInstanceNotFoundFault":
            print(f"Instance '{instance_id}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete DB instance. {code}: {message}")
        raise

def delete_db_subnet_group(neptune_client, subnet_group_name):
    """
    Deletes a Neptune DB subnet group synchronously using Boto3.

    Args:
        neptune_client (boto3.client): The Neptune client.
        subnet_group_name (str): The name of the DB subnet group to delete.

    Raises:
        ClientError: If the delete operation fails.
    """
    delete_group_request = {
        'DBSubnetGroupName': subnet_group_name
    }

    try:
        neptune_client.delete_db_subnet_group(**delete_group_request)
        print(f"️ Deleting Subnet Group: {subnet_group_name}")

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "DBSubnetGroupNotFoundFault":
            print(f"Subnet group '{subnet_group_name}' not found or already deleted.")
        elif code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't delete subnet group. {code}: {message}")
        raise

def describe_db_clusters(neptune_client, cluster_id: str):
    """
    Describes details of a Neptune DB cluster, paginating if needed.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_id (str): The ID of the cluster to describe.

    Raises:
        ClientError: If there's an AWS API error (e.g., cluster not found).
    """
    paginator = neptune_client.get_paginator('describe_db_clusters')

    try:
        pages = paginator.paginate(DBClusterIdentifier=cluster_id)

        found = False
        for page in pages:
            for cluster in page.get('DBClusters', []):
                found = True
                print(f"Cluster Identifier: {cluster.get('DBClusterIdentifier')}")
                print(f"Status: {cluster.get('Status')}")
                print(f"Engine: {cluster.get('Engine')}")
                print(f"Engine Version: {cluster.get('EngineVersion')}")
                print(f"Endpoint: {cluster.get('Endpoint')}")
                print(f"Reader Endpoint: {cluster.get('ReaderEndpoint')}")
                print(f"Availability Zones: {cluster.get('AvailabilityZones')}")
                print(f"Subnet Group: {cluster.get('DBSubnetGroup')}")
                print("VPC Security Groups:")
                for vpc_group in cluster.get('VpcSecurityGroups', []):
                    print(f"  - {vpc_group.get('VpcSecurityGroupId')}")
                print(f"Storage Encrypted: {cluster.get('StorageEncrypted')}")
                print(f"IAM Auth Enabled: {cluster.get('IAMDatabaseAuthenticationEnabled')}")
                print(f"Backup Retention Period: {cluster.get('BackupRetentionPeriod')} days")
                print(f"Preferred Backup Window: {cluster.get('PreferredBackupWindow')}")
                print(f"Preferred Maintenance Window: {cluster.get('PreferredMaintenanceWindow')}")
                print("------")

        if not found:
            # Treat empty response as cluster not found
            raise ClientError(
                {"Error": {"Code": "DBClusterNotFound", "Message": f"No cluster found with ID '{cluster_id}'"}},
                "DescribeDBClusters"
            )

    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        elif code == "DBClusterNotFound":
            print(f"Cluster '{cluster_id}' not found. Please verify the cluster ID.")
        else:
            print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
        raise

def check_instance_status(neptune_client, instance_id: str, desired_status: str):
    """
    Polls the status of a Neptune DB instance until it reaches desired_status.
    Uses pagination via describe_db_instances — even for a single instance.

    Raises:
      ClientError: If describe_db_instances fails (e.g., instance not found).
      RuntimeError: If timeout expires before reaching desired status.
    """
    paginator = neptune_client.get_paginator('describe_db_instances')
    start_time = time.time()

    while True:
        try:
            pages = paginator.paginate(DBInstanceIdentifier=instance_id)
            instances = []
            for page in pages:
                instances.extend(page.get('DBInstances', []))

        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBInstanceNotFound":
                print(f"Instance '{instance_id}' not found. Please verify the instance ID.")
            else:
                print(f"Failed to describe DB instance. {code}: {message}")
            raise

        current_status = instances[0].get('DBInstanceStatus') if instances else None
        elapsed = int(time.time() - start_time)

        print(f"\rElapsed: {format_elapsed_time(elapsed)}  Status: {current_status}", end="", flush=True)

        if current_status and current_status.lower() == desired_status.lower():
            print(f"\nInstance '{instance_id}' reached '{desired_status}' in {format_elapsed_time(elapsed)}.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for '{instance_id}' to reach '{desired_status}'")

        time.sleep(POLL_INTERVAL_SECONDS)

# Replace this with your actual Neptune endpoint
NEPTUNE_ENDPOINT = "https://[Specify Endpoint]:8182"

def main():
    """
    Entry point of the program. Initializes the Neptune client and executes the Gremlin query.
    """
    config = Config(connect_timeout=10, read_timeout=30, retries={'max_attempts': 3})

    neptune_client = boto3.client(
        "neptunedata",
        endpoint_url=NEPTUNE_ENDPOINT,
        config=config
    )

    execute_gremlin_query(neptune_client)


def execute_gremlin_query(neptune_client):
    """
    Executes a Gremlin query against an Amazon Neptune database.
    """
    try:
        print("Querying Neptune...")

        response = neptune_client.execute_gremlin_explain_query(
            gremlinQuery="g.V().has('code', 'ANC')"
        )

        print("Full Response:")
        print(response['output'].read().decode('UTF-8'))

    except ClientError as e:
        print(f"Error calling Neptune: {e.response['Error']['Message']}")
    except BotoCoreError as e:
        print(f"BotoCore error: {str(e)}")
    except Exception as e:
        print(f"Unexpected error: {str(e)}")


if __name__ == "__main__":
    main()

"""
Running this example.

----------------------------------------------------------------------------------
VPC Networking Requirement:
----------------------------------------------------------------------------------
Amazon Neptune must be accessed from **within the same VPC** as the Neptune cluster.
It does not expose a public endpoint, so this code must be executed from:

  - An **AWS Lambda function** configured to run inside the same VPC
  - An **EC2 instance** or **ECS task** running in the same VPC
  - A connected environment such as a **VPN**, **AWS Direct Connect**, or a **peered VPC**

"""

# Replace with your actual Neptune endpoint
NEPTUNE_ENDPOINT = "https://[Specify-Your-Endpoint]:8182"

def main():
    """
    Entry point of the program. Initializes the Neptune client and runs both EXPLAIN and PROFILE queries.
    """
    config = Config(connect_timeout=10, read_timeout=30, retries={'max_attempts': 3})

    neptune_client = boto3.client(
        "neptunedata",
        endpoint_url=NEPTUNE_ENDPOINT,
        config=config
    )

    try:
        run_profile_query(neptune_client)
    except ClientError as e:
        print(f"Neptune error: {e.response['Error']['Message']}")
    except BotoCoreError as e:
        print(f"BotoCore error: {str(e)}")
    except Exception as e:
        print(f"Unexpected error: {str(e)}")

def run_profile_query(neptune_client):
    """
    Runs a PROFILE query on the Neptune graph database.
    """
    print("Running Gremlin PROFILE query...")

    try:
        response = neptune_client.execute_gremlin_profile_query(
            gremlinQuery="g.V().has('code', 'ANC')"
        )
        print("Profile Query Result:")
        output = response.get("output")
        if output:
            print(output.read().decode('utf-8'))
        else:
            print("No explain output returned.")
    except Exception as e:
        print(f"Failed to execute PROFILE query: {str(e)}")


if __name__ == "__main__":
    main()

# Replace with your actual Neptune endpoint URL
NEPTUNE_ENDPOINT = "https://<your-neptune-endpoint>:8182"

def main():
    """
    Entry point: Create Neptune client and execute different OpenCypher queries.
    """
    config = Config(connect_timeout=10, read_timeout=30, retries={'max_attempts': 3})

    neptune_client = boto3.client(
        "neptunedata",
        endpoint_url=NEPTUNE_ENDPOINT,
        config=config
    )

    execute_open_cypher_query_without_params(neptune_client)
    execute_open_cypher_query_with_params(neptune_client)
    execute_open_cypher_explain_query(neptune_client)

def execute_open_cypher_query_without_params(client):
    """
    Executes a simple OpenCypher query without parameters.
    """
    try:
        print("\nRunning OpenCypher query without parameters...")
        resp = client.execute_open_cypher_query(
            openCypherQuery="MATCH (n {code: 'ANC'}) RETURN n"
        )
        print("Results:")
        print(resp['results'])

    except Exception as e:
        print(f"Error in simple OpenCypher query: {str(e)}")


def execute_open_cypher_query_with_params(client):
    """
    Executes an OpenCypher query using parameters.
    """
    try:
        print("\nRunning OpenCypher query with parameters...")
        parameters = {'code': 'ANC'}
        resp = client.execute_open_cypher_query(
            openCypherQuery="MATCH (n {code: $code}) RETURN n",
            parameters=json.dumps(parameters)
        )
        print("Results:")
        print(resp['results'])

    except Exception as e:
        print(f"Error in parameterized OpenCypher query: {str(e)}")

def execute_open_cypher_explain_query(client):
    """
    Runs an OpenCypher EXPLAIN query in debug mode.
    """
    try:
        print("\nRunning OpenCypher EXPLAIN query (debug mode)...")
        resp = client.execute_open_cypher_explain_query(
            openCypherQuery="MATCH (n {code: 'ANC'}) RETURN n",
            explainMode="details"
        )
        results = resp.get('results')
        if results is None:
            print("No explain results returned.")
        else:
            try:
                print("Explain Results:")
                print(results.read().decode('UTF-8'))
            except Exception as e:
                print(f"Error in OpenCypher EXPLAIN query: {str(e)}")

    except ClientError as e:
        print(f"Neptune error: {e.response['Error']['Message']}")
    except BotoCoreError as e:
        print(f"BotoCore error: {str(e)}")
    except Exception as e:
        print(f"Unexpected error: {str(e)}")


if __name__ == "__main__":
    main()

"""
Running this example.

----------------------------------------------------------------------------------
VPC Networking Requirement:
----------------------------------------------------------------------------------
Amazon Neptune must be accessed from **within the same VPC** as the Neptune cluster.
It does not expose a public endpoint, so this code must be executed from:

  - An **AWS Lambda function** configured to run inside the same VPC
  - An **EC2 instance** or **ECS task** running in the same VPC
  - A connected environment such as a **VPN**, **AWS Direct Connect**, or a **peered VPC**
"""

GRAPH_ID = "<your-graph-id>"

def main():
    config = Config(retries={"total_max_attempts": 1, "mode": "standard"}, read_timeout=None)
    client = boto3.client("neptune-graph", config=config)

    try:
        print("\n--- Running OpenCypher query without parameters ---")
        run_open_cypher_query(client, GRAPH_ID)

        print("\n--- Running OpenCypher query with parameters ---")
        run_open_cypher_query_with_params(client, GRAPH_ID)

        print("\n--- Running OpenCypher explain query ---")
        run_open_cypher_explain_query(client, GRAPH_ID)

    except Exception as e:
        print(f"Unexpected error in main: {e}")

def run_open_cypher_query(client, graph_id):
    """
    Run an OpenCypher query without parameters.
    """
    try:
        resp = client.execute_query(
            graphIdentifier=graph_id,
            queryString="MATCH (n {code: 'ANC'}) RETURN n",
            language='OPEN_CYPHER'
        )
        print(resp['payload'].read().decode('UTF-8'))

    except client.exceptions.InternalServerException as e:
        print(f"InternalServerException: {e.response['Error']['Message']}")
    except ClientError as e:
        print(f"ClientError: {e.response['Error']['Message']}")
    except Exception as e:  # <--- ADD THIS BLOCK
        print(f"Unexpected error: {e}")

def run_open_cypher_query_with_params(client, graph_id):
    """
    Run an OpenCypher query with parameters.
    """
    try:
        parameters = {'code': 'ANC'}
        resp = client.execute_query(
            graphIdentifier=graph_id,
            queryString="MATCH (n {code: $code}) RETURN n",
            language='OPEN_CYPHER',
            parameters=parameters
        )
        print(resp['payload'].read().decode('UTF-8'))

    except client.exceptions.InternalServerException as e:
        print(f"InternalServerException: {e.response['Error']['Message']}")
    except ClientError as e:
        print(f"ClientError: {e.response['Error']['Message']}")
    except Exception as e:  # <--- ADD THIS BLOCK
        print(f"Unexpected error: {e}")

def run_open_cypher_explain_query(client, graph_id):
    """
    Run an OpenCypher explain query (explainMode = "debug").
    """
    try:
        resp = client.execute_query(
            graphIdentifier=graph_id,
            queryString="MATCH (n {code: 'ANC'}) RETURN n",
            language='OPEN_CYPHER',
            explainMode='DETAILS'
        )
        print(resp['payload'].read().decode('UTF-8'))

    except ClientError as e:
        print(f"Neptune error: {e.response['Error']['Message']}")
    except BotoCoreError as e:
        print(f"Unexpected Boto3 error: {str(e)}")
    except Exception as e:  # <-- Add this generic catch
        print(f"Unexpected error: {str(e)}")

if __name__ == "__main__":
    main()

def start_db_cluster(neptune_client, cluster_identifier: str):
    """
    Starts an Amazon Neptune DB cluster and waits until it reaches 'available'.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_identifier (str): The DB cluster identifier.

    Raises:
        ClientError: Propagates AWS API issues like resource not found.
        RuntimeError: If cluster doesn't reach 'available' within timeout.
    """
    try:
        # Initial wait in case the cluster was just stopped
        time.sleep(30)
        neptune_client.start_db_cluster(DBClusterIdentifier=cluster_identifier)
    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't start DB cluster. Here's why: {code}: {message}")
        raise

    start_time = time.time()
    paginator = neptune_client.get_paginator('describe_db_clusters')

    while True:
        try:
            pages = paginator.paginate(DBClusterIdentifier=cluster_identifier)
            clusters = []
            for page in pages:
                clusters.extend(page.get('DBClusters', []))
        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBClusterNotFound":
                print(f"Cluster '{cluster_identifier}' not found while polling. It may have been deleted.")
            else:
                print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
            raise

        status = clusters[0].get('Status') if clusters else None
        elapsed = time.time() - start_time

        print(f"\rElapsed: {int(elapsed)}s – Cluster status: {status}", end="", flush=True)

        if status and status.lower() == 'available':
            print(f"\n🎉 Cluster '{cluster_identifier}' is available.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for cluster '{cluster_identifier}' to become available.")

        time.sleep(POLL_INTERVAL_SECONDS)

def stop_db_cluster(neptune_client, cluster_identifier: str):
    """
    Stops an Amazon Neptune DB cluster and waits until it's fully stopped.

    Args:
        neptune_client (boto3.client): The Neptune client.
        cluster_identifier (str): The DB cluster identifier.

    Raises:
        ClientError: For AWS API errors (e.g., resource not found).
        RuntimeError: If the cluster doesn't stop within the timeout.
    """
    try:
        neptune_client.stop_db_cluster(DBClusterIdentifier=cluster_identifier)
    except ClientError as err:
        code = err.response["Error"]["Code"]
        message = err.response["Error"]["Message"]

        if code == "AccessDeniedException":
            print("Access denied. Please ensure you have the necessary permissions.")
        else:
            print(f"Couldn't stop DB cluster. Here's why: {code}: {message}")
        raise

    start_time = time.time()
    paginator = neptune_client.get_paginator('describe_db_clusters')

    while True:
        try:
            pages = paginator.paginate(DBClusterIdentifier=cluster_identifier)
            clusters = []
            for page in pages:
                clusters.extend(page.get('DBClusters', []))
        except ClientError as err:
            code = err.response["Error"]["Code"]
            message = err.response["Error"]["Message"]

            if code == "DBClusterNotFound":
                print(f"Cluster '{cluster_identifier}' not found while polling. It may have been deleted.")
            else:
                print(f"Couldn't describe DB cluster. Here's why: {code}: {message}")
            raise

        status = clusters[0].get('Status') if clusters else None
        elapsed = time.time() - start_time

        print(f"\rElapsed: {int(elapsed)}s – Cluster status: {status}", end="", flush=True)

        if status and status.lower() == 'stopped':
            print(f"\nCluster '{cluster_identifier}' is now stopped.")
            return

        if elapsed > TIMEOUT_SECONDS:
            raise RuntimeError(f"Timeout waiting for cluster '{cluster_identifier}' to stop.")

        time.sleep(POLL_INTERVAL_SECONDS)