[Asset] Add quick start code for ExportAssets API (#1829)

* [Asset] Add quick start code for ExportAssets API
* [Asset] Minor fix on comment.
* [Asset] Fix import for test.
* [Asset] Attempt to fix build error
* [Asset] Fix code style issue.
* [Asset] Fix build failure
* [Asset] Minor fix
* [Asset] Fix build failure
* [Asset] Fix build failure
* [Asset] Minor fix.
* [Asset] Minor fix on license statement.
Remove "All Rights Reserved.".

Author: peter-zheng-g

asset/cloud-client/quickstart_exportassets.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+# Copyright 2018 Google LLC.
+#
+# Licensed 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.
+
+
+import argparse
+
+
+def export_assets(project_id, dump_file_path):
+    # [START asset_quickstart_exportassets]
+    from google.cloud import asset_v1beta1
+    from google.cloud.asset_v1beta1.proto import asset_service_pb2
+
+    # TODO project_id = "Your Google Cloud Project ID"
+    # TODO dump_file_path = "Your asset dump file path"
+
+    client = asset_v1beta1.AssetServiceClient()
+    parent = client.project_path(project_id)
+    output_config = asset_service_pb2.OutputConfig()
+    output_config.gcs_destination.uri = dump_file_path
+    response = client.export_assets(parent, output_config)
+    print(response.result)
+    # [END asset_quickstart_exportassets]
+
+
+if __name__ == '__main__':
+
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter
+    )
+    parser.add_argument('project_id', help='Your Google Cloud project ID')
+    parser.add_argument('dump_file_path',
+                        help='The file ExportAssets API will dump assets to, '
+                        'e.g.: gs://<bucket-name>/asset_dump_file')
+
+    args = parser.parse_args()
+
+    export_assets(args.project_id, args.dump_file_path)

asset/cloud-client/quickstart_exportassets_test.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+
+# Copyright 2018 Google LLC. All Rights Reserved.
+#
+# Licensed 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.
+
+import os
+
+from google.cloud import storage
+import pytest
+
+import quickstart_exportassets
+
+PROJECT = os.environ['GCLOUD_PROJECT']
+BUCKET = 'bucket-for-assets'
+
+
+@pytest.fixture(scope='module')
+def storage_client():
+    yield storage.Client()
+
+
+@pytest.fixture(scope='module')
+def asset_bucket(storage_client):
+    storage_client.create_bucket(BUCKET)
+
+    try:
+        storage_client.delete_bucket(BUCKET)
+    except Exception:
+        pass
+
+    yield BUCKET
+
+
+def test_export_assets(asset_bucket, capsys):
+    dump_file_path = "gs://", asset_bucket, "/assets-dump.txt"
+    quickstart_exportassets.export_assets(PROJECT, dump_file_path)
+    out, _ = capsys.readouterr()
+
+    assert "uri: \"gs://cai-prober-prod-for-assets/phython-test.txt\"" in out