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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 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 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]) create_db_instance = RdsCreateDbInstanceOperator( task_id="create_db_instance", db_instance_identifier=rds_instance_name, db_instance_class="db.t4g.micro", engine="postgres", rds_kwargs={ "MasterUsername": "rds_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", "AllocatedStorage": 20, "DBName": rds_db_name, }, ) # [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] delete_subscription.trigger_rule = TriggerRule.ALL_DONE delete_db_instance = RdsDeleteDbInstanceOperator( task_id="delete_db_instance", db_instance_identifier=rds_instance_name, rds_kwargs={"SkipFinalSnapshot": True}, trigger_rule=TriggerRule.ALL_DONE, ) chain( # TEST SETUP test_context, sns_topic, create_db_instance, # TEST BODY create_subscription, delete_subscription, # TEST TEARDOWN delete_db_instance, 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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