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# Copyright 2017 Google Inc.
#
# 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.
"""Demonstrates how to authenticate to Google BigQuery using the Google Cloud
Client Libraries."""
import argparse
def implicit():
from google.cloud import bigquery
# If you don't specify credentials when constructing the client, the
# client library will look for credentials in the environment.
bigquery_client = bigquery.Client()
# Make an authenticated API request
datasets = list(bigquery_client.list_datasets())
print(datasets)
def explicit():
from google.cloud import bigquery
# Explicitly use service account credentials by specifying the private key
# file. All clients in google-cloud-python have this helper, see
# https://googlecloudplatform.github.io/google-cloud-python/latest/core/auth.html#service-accounts
bigquery_client = bigquery.Client.from_service_account_json(
'service_account.json')
# Make an authenticated API request
datasets = list(bigquery_client.list_datasets())
print(datasets)
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter)
subparsers = parser.add_subparsers(dest='command')
subparsers.add_parser('implicit', help=implicit.__doc__)
subparsers.add_parser('explicit', help=explicit.__doc__)
args = parser.parse_args()
if args.command == 'implicit':
implicit()
elif args.command == 'explicit':
explicit()