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Example Airflow DAG for testing interaction between Google Cloud Storage and local file system.

from __future__ import annotations

import os
from datetime import datetime
from pathlib import Path

from airflow.models.dag import DAG
from import GCSCreateBucketOperator, GCSDeleteBucketOperator
from import GCSToLocalFilesystemOperator
from import LocalFilesystemToGCSOperator
from airflow.utils.trigger_rule import TriggerRule

[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT")
[docs]DAG_ID = "gcs_upload_download"
[docs]BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}"
[docs]FILE_NAME = "example_upload.txt"
[docs]PATH_TO_SAVED_FILE = "example_upload_download.txt"
[docs]UPLOAD_FILE_PATH = str(Path(__file__).parent / "resources" / FILE_NAME)
with DAG( DAG_ID, schedule="@once", start_date=datetime(2021, 1, 1), catchup=False, tags=["gcs", "example"], ) as dag: # [START howto_operator_gcs_create_bucket]
[docs] create_bucket = GCSCreateBucketOperator( task_id="create_bucket", bucket_name=BUCKET_NAME, project_id=PROJECT_ID, )
# [END howto_operator_gcs_create_bucket] # [START howto_operator_local_filesystem_to_gcs] upload_file = LocalFilesystemToGCSOperator( task_id="upload_file", src=UPLOAD_FILE_PATH, dst=FILE_NAME, bucket=BUCKET_NAME, ) # [END howto_operator_local_filesystem_to_gcs] # [START howto_operator_gcs_download_file_task] download_file = GCSToLocalFilesystemOperator( task_id="download_file", object_name=FILE_NAME, bucket=BUCKET_NAME, filename=PATH_TO_SAVED_FILE, ) # [END howto_operator_gcs_download_file_task] # [START howto_operator_gcs_delete_bucket] delete_bucket = GCSDeleteBucketOperator(task_id="delete_bucket", bucket_name=BUCKET_NAME) # [END howto_operator_gcs_delete_bucket] delete_bucket.trigger_rule = TriggerRule.ALL_DONE ( # TEST SETUP create_bucket >> upload_file # TEST BODY >> download_file # TEST TEARDOWN >> delete_bucket ) 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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