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import json
from datetime import datetime

from airflow import DAG
from airflow.models.baseoperator import chain
from import (
from import (
from airflow.utils.trigger_rule import TriggerRule
from import SystemTestContextBuilder

[docs]sys_test_context_task = SystemTestContextBuilder().build()
[docs]DAG_ID = 'example_cloudformation'
# The CloudFormation template must have at least one resource to # be usable, this example uses SQS as a free and serverless option.
[docs]CLOUDFORMATION_TEMPLATE = { 'Description': 'Stack from Airflow CloudFormation example DAG', 'Resources': { 'ExampleQueue': { 'Type': 'AWS::SQS::Queue',
} }, } 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'] cloudformation_stack_name = f'{env_id}-stack' cloudformation_create_parameters = { 'StackName': cloudformation_stack_name, 'TemplateBody': json.dumps(CLOUDFORMATION_TEMPLATE), 'TimeoutInMinutes': 2, 'OnFailure': 'DELETE', # Don't leave stacks behind if creation fails. } # [START howto_operator_cloudformation_create_stack] create_stack = CloudFormationCreateStackOperator( task_id='create_stack', stack_name=cloudformation_stack_name, cloudformation_parameters=cloudformation_create_parameters, ) # [END howto_operator_cloudformation_create_stack] # [START howto_sensor_cloudformation_create_stack] wait_for_stack_create = CloudFormationCreateStackSensor( task_id='wait_for_stack_create', stack_name=cloudformation_stack_name, ) # [END howto_sensor_cloudformation_create_stack] # [START howto_operator_cloudformation_delete_stack] delete_stack = CloudFormationDeleteStackOperator( task_id='delete_stack', trigger_rule=TriggerRule.ALL_DONE, stack_name=cloudformation_stack_name, ) # [END howto_operator_cloudformation_delete_stack] # [START howto_sensor_cloudformation_delete_stack] wait_for_stack_delete = CloudFormationDeleteStackSensor( task_id='wait_for_stack_delete', stack_name=cloudformation_stack_name, ) # [END howto_sensor_cloudformation_delete_stack] chain( # TEST SETUP test_context, # TEST BODY create_stack, wait_for_stack_create, delete_stack, wait_for_stack_delete, ) 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/
[docs]test_run = get_test_run(dag)

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