Source code for tests.system.google.cloud.pubsub.example_pubsub_deferrable

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"""
Example Airflow DAG that uses Google PubSub services.
"""

from __future__ import annotations

import os
from datetime import datetime

from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.pubsub import (
    PubSubCreateSubscriptionOperator,
    PubSubCreateTopicOperator,
    PubSubDeleteSubscriptionOperator,
    PubSubDeleteTopicOperator,
    PubSubPublishMessageOperator,
)
from airflow.providers.google.cloud.sensors.pubsub import PubSubPullSensor
from airflow.utils.trigger_rule import TriggerRule

[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")
[docs]PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT", "default")
[docs]DAG_ID = "pubsub_async"
[docs]TOPIC_ID = f"topic-{DAG_ID}-{ENV_ID}"
[docs]MESSAGE = {"data": b"Tool", "attributes": {"name": "wrench", "mass": "1.3kg", "count": "3"}}
with DAG( DAG_ID, schedule="@once", # Override to match your needs start_date=datetime(2021, 1, 1), catchup=False, ) as dag:
[docs] create_topic = PubSubCreateTopicOperator( task_id="create_topic", topic=TOPIC_ID, project_id=PROJECT_ID, fail_if_exists=False )
subscribe_task = PubSubCreateSubscriptionOperator( task_id="subscribe_task", project_id=PROJECT_ID, topic=TOPIC_ID ) publish_task = PubSubPublishMessageOperator( task_id="publish_task", project_id=PROJECT_ID, topic=TOPIC_ID, messages=[MESSAGE, MESSAGE], ) subscription = subscribe_task.output # [START howto_operator_gcp_pubsub_pull_message_with_async_sensor] pull_messages_async = PubSubPullSensor( task_id="pull_messages_async", ack_messages=True, project_id=PROJECT_ID, subscription=subscription, deferrable=True, ) # [END howto_operator_gcp_pubsub_pull_message_with_async_sensor] unsubscribe_task = PubSubDeleteSubscriptionOperator( task_id="unsubscribe_task", project_id=PROJECT_ID, subscription=subscription, ) unsubscribe_task.trigger_rule = TriggerRule.ALL_DONE delete_topic = PubSubDeleteTopicOperator(task_id="delete_topic", topic=TOPIC_ID, project_id=PROJECT_ID) delete_topic.trigger_rule = TriggerRule.ALL_DONE ( create_topic >> subscribe_task >> publish_task >> pull_messages_async >> unsubscribe_task >> delete_topic ) # Task dependencies created via `XComArgs`: # subscribe_task >> pull_messages_async # subscribe_task >> unsubscribe_task # ### Everything below this line is not part of example ### # ### Just for system tests purpose ### from tests_common.test_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_common.test_utils.system_tests 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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