def test_file_splitting(self, gcs_hook_mock_class):
"""Test that ndjson is split by approx_max_file_size_bytes param."""
gcs_hook_mock = gcs_hook_mock_class.return_value
expected_upload = {
FILENAME.format(0): b''.join(NDJSON_LINES[:2]),
FILENAME.format(1): NDJSON_LINES[2],
}
def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):
self.assertEqual(BUCKET, bucket)
self.assertEqual('application/json', mime_type)
self.assertFalse(gzip)
with open(tmp_filename, 'rb') as file:
self.assertEqual(expected_upload[obj], file.read())
gcs_hook_mock.upload.side_effect = _assert_upload
op = PostgresToGoogleCloudStorageOperator(
task_id=TASK_ID,
sql=SQL,
bucket=BUCKET,
filename=FILENAME,
approx_max_file_size_bytes=len(
expected_upload[FILENAME.format(0)]))
op.execute(None)
def test_init(self):
"""Test PostgresToGoogleCloudStorageOperator instance is properly initialized."""
op = PostgresToGoogleCloudStorageOperator(
task_id=TASK_ID, sql=SQL, bucket=BUCKET, filename=FILENAME)
self.assertEqual(op.task_id, TASK_ID)
self.assertEqual(op.sql, SQL)
self.assertEqual(op.bucket, BUCKET)
self.assertEqual(op.filename, FILENAME)
def test_exec_success(self, gcs_hook_mock_class):
"""Test the execute function in case where the run is successful."""
op = PostgresToGoogleCloudStorageOperator(
task_id=TASK_ID,
postgres_conn_id=POSTGRES_CONN_ID,
sql=SQL,
bucket=BUCKET,
filename=FILENAME)
gcs_hook_mock = gcs_hook_mock_class.return_value
def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip):
self.assertEqual(BUCKET, bucket)
self.assertEqual(FILENAME.format(0), obj)
self.assertEqual('application/json', mime_type)
self.assertFalse(gzip)
with open(tmp_filename, 'rb') as file:
self.assertEqual(b''.join(NDJSON_LINES), file.read())
gcs_hook_mock.upload.side_effect = _assert_upload
op.execute(None)
def test_schema_file(self, gcs_hook_mock_class):
"""Test writing schema files."""
gcs_hook_mock = gcs_hook_mock_class.return_value
def _assert_upload(bucket, obj, tmp_filename, mime_type, gzip): # pylint: disable=unused-argument
if obj == SCHEMA_FILENAME:
with open(tmp_filename, 'rb') as file:
self.assertEqual(SCHEMA_JSON, file.read())
gcs_hook_mock.upload.side_effect = _assert_upload
op = PostgresToGoogleCloudStorageOperator(
task_id=TASK_ID,
sql=SQL,
bucket=BUCKET,
filename=FILENAME,
schema_filename=SCHEMA_FILENAME)
op.execute(None)
# once for the file and once for the schema
self.assertEqual(2, gcs_hook_mock.upload.call_count)
import airflow
from airflow import models
from airflow.operators.postgres_to_gcs import PostgresToGoogleCloudStorageOperator
default_args = {"start_date": airflow.utils.dates.days_ago(1)}
GCS_BUCKET = "postgres_to_gcs_example"
FILENAME = "test_file"
QUERY = "select * from test_table;"
with models.DAG(
dag_id='example_postgres_to_gcs',
default_args=default_args,
schedule_interval=None, # Override to match your needs
) as dag:
upload_data = PostgresToGoogleCloudStorageOperator(task_id="get_data",
sql=QUERY,
bucket=GCS_BUCKET,
filename=FILENAME,
gzip=False)