Fokko commented on a change in pull request #4134: [AIRFLOW-3213] Create ADLS to GCS operator URL: https://github.com/apache/incubator-airflow/pull/4134#discussion_r230882903
########## File path: airflow/contrib/operators/adls_to_gcs.py ########## @@ -0,0 +1,144 @@ +# -*- coding: utf-8 -*- +# +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +from airflow.contrib.hooks.azure_data_lake_hook import AzureDataLakeHook +from airflow.contrib.operators.adls_list_operator import AzureDataLakeStorageListOperator +from airflow.utils.decorators import apply_defaults +from airflow.contrib.hooks.gcs_hook import GoogleCloudStorageHook, _parse_gcs_url + +import os +from tempfile import NamedTemporaryFile + + +class AdlsToGoogleCloudStorageOperator(AzureDataLakeStorageListOperator): + """ + Synchronizes an Azure Data Lake Storage path with a GCS bucket + :param path: The Azure Data Lake path to find the objects (templated) + :type path: str + :param dest_gcs: The Google Cloud Storage bucket and prefix to + store the objects. (templated) + :type dest_gcs: str + :param replace: If true, replaces same-named files in GCS + :type replace: bool + :param azure_data_lake_conn_id: The connection ID to use when + connecting to Azure Data Lake Storage. + :type azure_data_lake_conn_id: str + :param dest_google_cloud_storage_conn_id: The connection ID to use when + connecting to Google Cloud Storage. + :type dest_google_cloud_storage_conn_id: str + :param delegate_to: The account to impersonate, if any. + For this to work, the service account making the request must have + domain-wide delegation enabled. + :type delegate_to: str + + **Examples**: + The following Operator would copy a single file named + ``hello/world.avro`` from ADLS to the GCS bucket ``mybucket``. Its full + resulting gcs path will be ``gs://mybucket/hello/world.avro`` :: + copy_single_file = AdlsToGoogleCloudStorageOperator( + task_id='copy_single_file', + path='hello/world.avro', + dest_gcs='gs://mybucket', + replace=False, + azure_data_lake_conn_id='azure_data_lake_default', + google_cloud_storage_conn_id='google_cloud_default' + ) + + The following Operator would copy all parquet files from ADLS + to the GCS bucket ``mybucket``. :: + copy_all_files = AdlsToGoogleCloudStorageOperator( + task_id='copy_all_files', + path='*.parquet', + dest_gcs='gs://mybucket', + replace=False, + azure_data_lake_conn_id='azure_data_lake_default', + google_cloud_storage_conn_id='google_cloud_default' + ) + + The following Operator would copy all parquet files from ADLS + path ``/hello/world``to the GCS bucket ``mybucket``. :: + copy_world_files = AdlsToGoogleCloudStorageOperator( + task_id='copy_world_files', + path='hello/world/*.parquet', + dest_gcs='gs://mybucket', + replace=False, + azure_data_lake_conn_id='azure_data_lake_default', + google_cloud_storage_conn_id='google_cloud_default' + ) + """ + template_fields = ('path', 'dest_gcs') + ui_color = '#f0eee4' + + @apply_defaults + def __init__(self, + path, + dest_gcs=None, + replace=False, + azure_data_lake_conn_id='azure_data_lake_default', + google_cloud_storage_conn_id='google_cloud_default', + delegate_to=None, + *args, + **kwargs): + + super(AdlsToGoogleCloudStorageOperator, self).__init__( + path=path, + azure_data_lake_conn_id=azure_data_lake_conn_id, + *args, + **kwargs + ) + self.dest_gcs = dest_gcs + self.replace = replace + self.google_cloud_storage_conn_id = google_cloud_storage_conn_id + self.delegate_to = delegate_to + + def execute(self, context): + # use the super to list all files in an Azure Data Lake path + files = super(AdlsToGoogleCloudStorageOperator, self).execute(context) + g_hook = GoogleCloudStorageHook( + google_cloud_storage_conn_id=self.google_cloud_storage_conn_id, + delegate_to=self.delegate_to) + + if not self.replace: + # if we are not replacing -> list all files in the ADLS path + # and only keep those files which are present in + # ADLS and not in Google Cloud Storage + bucket_name, prefix = _parse_gcs_url(self.dest_gcs) + existing_files = g_hook.list(bucket=bucket_name, prefix=prefix) + files = set(files) - set(existing_files) + + if files: + hook = AzureDataLakeHook( + azure_data_lake_conn_id=self.azure_data_lake_conn_id + ) + + for file in files: + with NamedTemporaryFile(mode='wb', delete=True) as f: + hook.download_file(local_path=f.name, remote_path=file) + f.flush() + dest_gcs_bucket, dest_gcs_prefix = _parse_gcs_url(self.dest_gcs) + dest_path = os.path.join(dest_gcs_prefix, file) + self.log.info("Saving file to %s", dest_path) + + g_hook.upload(bucket=dest_gcs_bucket, object=dest_path, filename=f.name) + + self.log.info("All done, uploaded %d files to GCS", len(files)) + else: + self.log.info("In sync, no files needed to be uploaded to GCS") + + return files Review comment: Wouldn't this be too big for XCOM? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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