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"""
Example Airflow DAG for Google Cloud Storage to Samba transfer operators.
"""
from __future__ import annotations
import os
from datetime import datetime
from pathlib import Path
from airflow import models
from airflow.providers.google.cloud.operators.gcs import GCSCreateBucketOperator, GCSDeleteBucketOperator
from airflow.providers.google.cloud.transfers.local_to_gcs import LocalFilesystemToGCSOperator
from airflow.providers.samba.transfers.gcs_to_samba import GCSToSambaOperator
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]SMB_CONN = "samba_default"
[docs]BUCKET_NAME = f"bucket_{DAG_ID}_{ENV_ID}"
[docs]DESTINATION_PATH_1 = "tmp/single-file/"
[docs]DESTINATION_PATH_2 = "tmp/dest-dir-1/"
[docs]DESTINATION_PATH_3 = "tmp/dest-dir-2/"
FILE_NAME = GCS_SRC_FILE = "empty.txt"
[docs]UPLOAD_SRC = str(Path(__file__).parent / "resources" / FILE_NAME)
[docs]GCS_SRC_FILE_IN_DIR = f"dir-1/{FILE_NAME}"
[docs]GCS_SRC_DIR = "dir-2/*.txt"
[docs]UPLOAD_IN_DIR_DST = f"dir-2/{FILE_NAME}"
with models.DAG(
DAG_ID,
schedule="@once",
start_date=datetime(2021, 1, 1),
catchup=False,
tags=["example", "gcs", "smb"],
) as dag:
[docs] create_bucket = GCSCreateBucketOperator(
task_id="create_bucket", bucket_name=BUCKET_NAME, project_id=PROJECT_ID
)
upload_file_1 = LocalFilesystemToGCSOperator(
task_id="upload_file_1",
src=UPLOAD_SRC,
dst=FILE_NAME,
bucket=BUCKET_NAME,
)
upload_file_2 = LocalFilesystemToGCSOperator(
task_id="upload_file_2",
src=UPLOAD_SRC,
dst=GCS_SRC_FILE_IN_DIR,
bucket=BUCKET_NAME,
)
upload_file_3 = LocalFilesystemToGCSOperator(
task_id="upload_file_3",
src=UPLOAD_SRC,
dst=UPLOAD_IN_DIR_DST,
bucket=BUCKET_NAME,
)
# [START howto_operator_gcs_to_samba_copy_single_file]
copy_file_from_gcs_to_samba = GCSToSambaOperator(
task_id="file-copy-gcs-to-samba",
samba_conn_id=SMB_CONN,
source_bucket=BUCKET_NAME,
source_object=GCS_SRC_FILE,
destination_path=DESTINATION_PATH_1,
)
# [END howto_operator_gcs_to_samba_copy_single_file]
# [START howto_operator_gcs_to_samba_move_single_file_destination]
move_file_from_gcs_to_samba = GCSToSambaOperator(
task_id="file-move-gcs-to-samba",
samba_conn_id=SMB_CONN,
source_bucket=BUCKET_NAME,
source_object=GCS_SRC_FILE_IN_DIR,
destination_path=DESTINATION_PATH_1,
move_object=True,
)
# [END howto_operator_gcs_to_samba_move_single_file_destination]
# [START howto_operator_gcs_to_samba_copy_directory]
copy_dir_from_gcs_to_samba = GCSToSambaOperator(
task_id="dir-copy-gcs-to-samba",
samba_conn_id=SMB_CONN,
source_bucket=BUCKET_NAME,
source_object=GCS_SRC_DIR,
destination_path=DESTINATION_PATH_2,
)
# [END howto_operator_gcs_to_samba_copy_directory]
# [START howto_operator_gcs_to_samba_move_specific_files]
move_dir_from_gcs_to_samba = GCSToSambaOperator(
task_id="dir-move-gcs-to-samba",
samba_conn_id=SMB_CONN,
source_bucket=BUCKET_NAME,
source_object=GCS_SRC_DIR,
destination_path=DESTINATION_PATH_3,
keep_directory_structure=False,
)
# [END howto_operator_gcs_to_samba_move_specific_files]
delete_bucket = GCSDeleteBucketOperator(
task_id="delete_bucket", bucket_name=BUCKET_NAME, trigger_rule=TriggerRule.ALL_DONE
)
(
# TEST SETUP
create_bucket
>> (upload_file_1, upload_file_2, upload_file_3)
# TEST BODY
>> copy_file_from_gcs_to_samba
>> move_file_from_gcs_to_samba
>> copy_dir_from_gcs_to_samba
>> move_dir_from_gcs_to_samba
# 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/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)
