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From GitBox <...@apache.org>
Subject [GitHub] bkvarda commented on a change in pull request #4134: [AIRFLOW-3213] Create ADLS to GCS operator
Date Wed, 07 Nov 2018 16:41:30 GMT
bkvarda 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_r231582800
 
 

 ##########
 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:
   Since it's just a collection of strings, it would be pretty unlikely. XCOM values are stored
as sqlalchemy.LargeBinary, correct? 

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