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Example Airflow DAG for Google Cloud Storage operators for listing, copying and deleting
bucket content.
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.operators.bash import BashOperator
from import (
from import GCSToGCSOperator
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_copy_delete"
[docs]BUCKET_NAME_SRC = f"bucket_{DAG_ID}_{ENV_ID}"
[docs]BUCKET_NAME_DST = f"bucket_dst_{DAG_ID}_{ENV_ID}"
[docs]FILE_NAME = "example_upload.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:
[docs] create_bucket_src = GCSCreateBucketOperator( task_id="create_bucket_src", bucket_name=BUCKET_NAME_SRC, project_id=PROJECT_ID, )
create_bucket_dst = GCSCreateBucketOperator( task_id="create_bucket_dst", bucket_name=BUCKET_NAME_DST, project_id=PROJECT_ID, ) upload_file = LocalFilesystemToGCSOperator( task_id="upload_file", src=UPLOAD_FILE_PATH, dst=FILE_NAME, bucket=BUCKET_NAME_SRC, ) # [START howto_operator_gcs_list_bucket] list_buckets = GCSListObjectsOperator(task_id="list_buckets", bucket=BUCKET_NAME_SRC) # [END howto_operator_gcs_list_bucket] list_buckets_result = BashOperator( task_id="list_buckets_result", bash_command=f"echo {list_buckets.output}", ) copy_file = GCSToGCSOperator( task_id="copy_file", source_bucket=BUCKET_NAME_SRC, source_object=FILE_NAME, destination_bucket=BUCKET_NAME_DST, destination_object=FILE_NAME, ) # [START howto_operator_gcs_delete_object] delete_files = GCSDeleteObjectsOperator( task_id="delete_files", bucket_name=BUCKET_NAME_SRC, objects=[FILE_NAME] ) # [END howto_operator_gcs_delete_object] delete_bucket_src = GCSDeleteBucketOperator( task_id="delete_bucket_src", bucket_name=BUCKET_NAME_SRC, trigger_rule=TriggerRule.ALL_DONE ) delete_bucket_dst = GCSDeleteBucketOperator( task_id="delete_bucket_dst", bucket_name=BUCKET_NAME_DST, trigger_rule=TriggerRule.ALL_DONE ) chain( # TEST SETUP [create_bucket_src, create_bucket_dst], upload_file, # TEST BODY list_buckets, list_buckets_result, copy_file, delete_files, # TEST TEARDOWN [delete_bucket_src, delete_bucket_dst], ) 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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