Source code for tests.system.google.cloud.dataflow.example_dataflow_streaming_python

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"""
Example Airflow DAG for testing Google Dataflow Beam Pipeline Operator with Python for Streaming job.
"""

from __future__ import annotations

import os
from datetime import datetime

from airflow.models.dag import DAG
from airflow.providers.apache.beam.hooks.beam import BeamRunnerType
from airflow.providers.apache.beam.operators.beam import BeamRunPythonPipelineOperator
from airflow.providers.google.cloud.operators.dataflow import DataflowStopJobOperator
from airflow.providers.google.cloud.operators.gcs import GCSCreateBucketOperator, GCSDeleteBucketOperator
from airflow.providers.google.cloud.operators.pubsub import (
    PubSubCreateTopicOperator,
    PubSubDeleteTopicOperator,
)
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 = "dataflow_native_python_streaming"



[docs]RESOURCE_DATA_BUCKET = "airflow-system-tests-resources"


[docs]BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}"



[docs]GCS_TMP = f"gs://{BUCKET_NAME}/temp/"


[docs]GCS_STAGING = f"gs://{BUCKET_NAME}/staging/"


[docs]GCS_PYTHON_SCRIPT = f"gs://{RESOURCE_DATA_BUCKET}/dataflow/python/streaming_wordcount.py"


[docs]LOCATION = "europe-west3"


[docs]TOPIC_ID = f"topic-{DAG_ID}"



[docs]default_args = {
    "dataflow_default_options": {
        "tempLocation": GCS_TMP,
        "stagingLocation": GCS_STAGING,
    }
}


with DAG(
    DAG_ID,
    default_args=default_args,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["example", "dataflow"],
) as dag:

[docs]    create_bucket = GCSCreateBucketOperator(task_id="create_bucket", bucket_name=BUCKET_NAME)


    create_pub_sub_topic = PubSubCreateTopicOperator(
        task_id="create_topic", topic=TOPIC_ID, project_id=PROJECT_ID, fail_if_exists=False
    )

    # [START howto_operator_start_streaming_python_job]
    start_streaming_python_job = BeamRunPythonPipelineOperator(
        runner=BeamRunnerType.DataflowRunner,
        task_id="start_streaming_python_job",
        py_file=GCS_PYTHON_SCRIPT,
        py_options=[],
        pipeline_options={
            "temp_location": GCS_TMP,
            "input_topic": "projects/pubsub-public-data/topics/taxirides-realtime",
            "output_topic": f"projects/{PROJECT_ID}/topics/{TOPIC_ID}",
            "streaming": True,
        },
        py_requirements=["apache-beam[gcp]==2.59.0"],
        py_interpreter="python3",
        py_system_site_packages=False,
        dataflow_config={"location": LOCATION, "job_name": "start_python_job_streaming"},
    )
    # [END howto_operator_start_streaming_python_job]

    stop_dataflow_job = DataflowStopJobOperator(
        task_id="stop_dataflow_job",
        location=LOCATION,
        job_id="{{ task_instance.xcom_pull(task_ids='start_streaming_python_job')['dataflow_job_id'] }}",
    )

    delete_topic = PubSubDeleteTopicOperator(task_id="delete_topic", topic=TOPIC_ID, project_id=PROJECT_ID)
    delete_topic.trigger_rule = TriggerRule.ALL_DONE

    delete_bucket = GCSDeleteBucketOperator(
        task_id="delete_bucket", bucket_name=BUCKET_NAME, trigger_rule=TriggerRule.ALL_DONE
    )

    (
        # TEST SETUP
        create_bucket
        >> create_pub_sub_topic
        # TEST BODY
        >> start_streaming_python_job
        # TEST TEARDOWN
        >> stop_dataflow_job
        >> delete_topic
        >> delete_bucket
    )

    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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