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#
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#
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from __future__ import annotations
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],
"assignPublicIp": "ENABLED",
},
},
)
# [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)
