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"""
Example Airflow DAG for testing Google Dataflow.
:class:`~airflow.providers.google.cloud.operators.dataflow.DataflowTemplatedJobStartOperator` operator.
"""
from __future__ import annotations
import os
from datetime import datetime
from pathlib import Path
from airflow.models.baseoperator import chain
from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.dataflow import (
DataflowStartFlexTemplateOperator,
DataflowTemplatedJobStartOperator,
)
from airflow.providers.google.cloud.operators.gcs import GCSCreateBucketOperator, GCSDeleteBucketOperator
from airflow.providers.google.cloud.transfers.local_to_gcs import LocalFilesystemToGCSOperator
from airflow.utils.trigger_rule import TriggerRule
from system.google import DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
[docs]
ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")
[docs]
PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT") or DEFAULT_GCP_SYSTEM_TEST_PROJECT_ID
[docs]
DAG_ID = "dataflow_template"
[docs]
BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}".replace("_", "-")
[docs]
CSV_FILE_NAME = "input.csv"
[docs]
AVRO_FILE_NAME = "output.avro"
[docs]
AVRO_SCHEMA = "schema.json"
[docs]
GCS_TMP = f"gs://{BUCKET_NAME}/temp/"
[docs]
GCS_STAGING = f"gs://{BUCKET_NAME}/staging/"
[docs]
GCS_OUTPUT = f"gs://{BUCKET_NAME}/output"
[docs]
PYTHON_FILE_LOCAL_PATH = str(Path(__file__).parent / "resources" / CSV_FILE_NAME)
[docs]
SCHEMA_LOCAL_PATH = str(Path(__file__).parent / "resources" / AVRO_SCHEMA)
[docs]
LOCATION = "europe-west3"
[docs]
default_args = {
"dataflow_default_options": {
"tempLocation": GCS_TMP,
"stagingLocation": GCS_STAGING,
}
}
[docs]
BODY = {
"launchParameter": {
"jobName": "test-flex-template",
"parameters": {
"inputFileSpec": f"gs://{BUCKET_NAME}/{CSV_FILE_NAME}",
"outputBucket": f"gs://{BUCKET_NAME}/output/{AVRO_FILE_NAME}",
"outputFileFormat": "avro",
"inputFileFormat": "csv",
"schema": f"gs://{BUCKET_NAME}/{AVRO_SCHEMA}",
},
"environment": {},
"containerSpecGcsPath": "gs://dataflow-templates/latest/flex/File_Format_Conversion",
},
}
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)
upload_file = LocalFilesystemToGCSOperator(
task_id="upload_file_to_bucket",
src=PYTHON_FILE_LOCAL_PATH,
dst=CSV_FILE_NAME,
bucket=BUCKET_NAME,
)
upload_schema = LocalFilesystemToGCSOperator(
task_id="upload_schema_to_bucket",
src=SCHEMA_LOCAL_PATH,
dst=AVRO_SCHEMA,
bucket=BUCKET_NAME,
)
# [START howto_operator_start_template_job]
start_template_job = DataflowTemplatedJobStartOperator(
task_id="start_template_job",
project_id=PROJECT_ID,
template="gs://dataflow-templates/latest/Word_Count",
parameters={"inputFile": f"gs://{BUCKET_NAME}/{CSV_FILE_NAME}", "output": GCS_OUTPUT},
location=LOCATION,
wait_until_finished=True,
)
# [END howto_operator_start_template_job]
# [START howto_operator_start_flex_template_job]
start_flex_template_job = DataflowStartFlexTemplateOperator(
task_id="start_flex_template_job",
project_id=PROJECT_ID,
body=BODY,
location=LOCATION,
append_job_name=False,
wait_until_finished=True,
)
# [END howto_operator_start_flex_template_job]
# [START howto_operator_start_template_job_deferrable]
start_template_job_deferrable = DataflowTemplatedJobStartOperator(
task_id="start_template_job_deferrable",
project_id=PROJECT_ID,
template="gs://dataflow-templates/latest/Word_Count",
parameters={"inputFile": f"gs://{BUCKET_NAME}/{CSV_FILE_NAME}", "output": GCS_OUTPUT},
location=LOCATION,
deferrable=True,
)
# [END howto_operator_start_template_job_deferrable]
# [START howto_operator_start_flex_template_job_deferrable]
start_flex_template_job_deferrable = DataflowStartFlexTemplateOperator(
task_id="start_flex_template_job_deferrable",
project_id=PROJECT_ID,
body=BODY,
location=LOCATION,
append_job_name=False,
deferrable=True,
)
# [END howto_operator_start_flex_template_job_deferrable]
delete_bucket = GCSDeleteBucketOperator(
task_id="delete_bucket", bucket_name=BUCKET_NAME, trigger_rule=TriggerRule.ALL_DONE
)
chain(
create_bucket,
upload_file,
upload_schema,
[start_template_job, start_flex_template_job],
[start_template_job_deferrable, start_flex_template_job_deferrable],
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)