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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 import RdsHook
from import (
from airflow.utils.trigger_rule import TriggerRule
from import ENV_ID_KEY, SystemTestContextBuilder

[docs]DAG_ID = 'example_rds_event'
[docs]sys_test_context_task = SystemTestContextBuilder().build()
[docs]def create_sns_topic(env_id) -> str: return boto3.client('sns').create_topic(Name=f'{env_id}-topic')['TopicArn']
[docs]def create_rds_instance(db_name, instance_name) -> None: rds_client = RdsHook().get_conn() rds_client.create_db_instance( DBName=db_name, DBInstanceIdentifier=instance_name, AllocatedStorage=20, DBInstanceClass='db.t3.micro', Engine='postgres', MasterUsername='username', # NEVER store your production password in plaintext in a DAG like this. # Use Airflow Secrets or a secret manager for this in production. MasterUserPassword='rds_password', ) rds_client.get_waiter('db_instance_available').wait(DBInstanceIdentifier=instance_name)
[docs]def delete_db_instance(instance_name) -> None: rds_client = RdsHook().get_conn() rds_client.delete_db_instance( DBInstanceIdentifier=instance_name, SkipFinalSnapshot=True, ) rds_client.get_waiter('db_instance_deleted').wait(DBInstanceIdentifier=instance_name)
[docs]def delete_sns_topic(topic_arn) -> None: boto3.client('sns').delete_topic(TopicArn=topic_arn)
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()
rds_db_name = f'{test_context[ENV_ID_KEY]}_db' rds_instance_name = f'{test_context[ENV_ID_KEY]}-instance' rds_subscription_name = f'{test_context[ENV_ID_KEY]}-subscription' sns_topic = create_sns_topic(test_context[ENV_ID_KEY]) # [START howto_operator_rds_create_event_subscription] create_subscription = RdsCreateEventSubscriptionOperator( task_id='create_subscription', subscription_name=rds_subscription_name, sns_topic_arn=sns_topic, source_type='db-instance', source_ids=[rds_instance_name], event_categories=['availability'], ) # [END howto_operator_rds_create_event_subscription] # [START howto_operator_rds_delete_event_subscription] delete_subscription = RdsDeleteEventSubscriptionOperator( task_id='delete_subscription', subscription_name=rds_subscription_name, ) # [END howto_operator_rds_delete_event_subscription] chain( # TEST SETUP test_context, sns_topic, create_rds_instance(rds_db_name, rds_instance_name), # TEST BODY create_subscription, delete_subscription, # TEST TEARDOWN delete_db_instance(rds_instance_name), delete_sns_topic(sns_topic), ) 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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