Source code for tests.system.providers.amazon.aws.example_ecs_fargate

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from datetime import datetime

import boto3

from airflow import DAG
from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.operators.ecs import EcsOperator
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder


[docs]DAG_ID = 'example_ecs_fargate'


# Externally fetched variables:

[docs]SUBNETS_KEY = 'SUBNETS'  # At least one public subnet is required.


[docs]SECURITY_GROUPS_KEY = 'SECURITY_GROUPS'



[docs]sys_test_context_task = (
    SystemTestContextBuilder()
    .add_variable(SUBNETS_KEY, split_string=True)
    .add_variable(SECURITY_GROUPS_KEY, split_string=True)

    .build()
)


@task

[docs]def create_cluster(cluster_name: str) -> None:
    """Creates an ECS cluster."""
    boto3.client('ecs').create_cluster(clusterName=cluster_name)



@task

[docs]def register_task_definition(task_name: str, container_name: str) -> str:
    """Creates a Task Definition."""
    response = boto3.client('ecs').register_task_definition(
        family=task_name,
        # CPU and Memory are required for Fargate and are set to the lowest currently allowed values.
        cpu='256',
        memory='512',
        containerDefinitions=[
            {
                'name': container_name,
                'image': 'ubuntu',
                'workingDirectory': '/usr/bin',
                'entryPoint': ['sh', '-c'],
                'command': ['ls'],
            }
        ],
        requiresCompatibilities=['FARGATE'],
        networkMode='awsvpc',
    )

    return response['taskDefinition']['taskDefinitionArn']



@task(trigger_rule=TriggerRule.ALL_DONE)

[docs]def delete_task_definition(task_definition_arn: str) -> None:
    """Deletes the Task Definition."""
    boto3.client('ecs').deregister_task_definition(taskDefinition=task_definition_arn)



@task(trigger_rule=TriggerRule.ALL_DONE)

[docs]def delete_cluster(cluster_name: str) -> None:
    """Deletes the ECS cluster."""
    boto3.client('ecs').delete_cluster(cluster=cluster_name)



with DAG(
    dag_id=DAG_ID,
    schedule='@once',
    start_date=datetime(2021, 1, 1),
    tags=['example'],
    catchup=False,
) as dag:

[docs]    test_context = sys_test_context_task()

    env_id = test_context[ENV_ID_KEY]

    cluster_name = f'{env_id}-test-cluster'
    container_name = f'{env_id}-test-container'
    task_definition_name = f'{env_id}-test-definition'

    create_task_definition = register_task_definition(task_definition_name, container_name)

    # [START howto_operator_ecs]
    hello_world = EcsOperator(
        task_id='hello_world',
        cluster=cluster_name,
        task_definition=task_definition_name,
        launch_type='FARGATE',
        overrides={
            'containerOverrides': [
                {
                    'name': container_name,
                    'command': ['echo', 'hello', 'world'],
                },
            ],
        },
        network_configuration={
            'awsvpcConfiguration': {
                'subnets': test_context[SUBNETS_KEY],
                'securityGroups': test_context[SECURITY_GROUPS_KEY],
            },
        },
    )
    # [END howto_operator_ecs]

    chain(
        # TEST SETUP
        test_context,
        create_cluster(cluster_name),
        create_task_definition,
        # TEST BODY
        hello_world,
        # TEST TEARDOWN
        delete_task_definition(create_task_definition),
        delete_cluster(cluster_name),
    )

    from tests.system.utils.watcher import watcher

    # This test needs watcher in order to properly mark success/failure
    # when "tearDown" task with trigger rule is part of the DAG
    list(dag.tasks) >> watcher()

from tests.system.utils import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)

[docs]test_run = get_test_run(dag)

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