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# 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.
# [START functions_sql_postgres]
from os import getenv
from psycopg2 import OperationalError
from psycopg2.pool import SimpleConnectionPool
# TODO(developer): specify SQL connection details
CONNECTION_NAME = getenv(
'INSTANCE_CONNECTION_NAME',
'<YOUR INSTANCE CONNECTION NAME>')
DB_USER = getenv('POSTGRES_USER', '<YOUR DB USER>')
DB_PASSWORD = getenv('POSTGRES_PASSWORD', '<YOUR DB PASSWORD>')
DB_NAME = getenv('POSTGRES_DATABASE', '<YOUR DB NAME>')
pg_config = {
'user': DB_USER,
'password': DB_PASSWORD,
'dbname': DB_NAME
}
# Connection pools reuse connections between invocations,
# and handle dropped or expired connections automatically.
pg_pool = None
def __connect(host):
"""
Helper function to connect to Postgres
"""
global pg_pool
pg_config['host'] = host
pg_pool = SimpleConnectionPool(1, 1, **pg_config)
def postgres_demo(request):
global pg_pool
# Initialize the pool lazily, in case SQL access isn't needed for this
# GCF instance. Doing so minimizes the number of active SQL connections,
# which helps keep your GCF instances under SQL connection limits.
if not pg_pool:
try:
__connect(f'/cloudsql/{CONNECTION_NAME}')
except OperationalError:
# If production settings fail, use local development ones
__connect('localhost')
# Remember to close SQL resources declared while running this function.
# Keep any declared in global scope (e.g. pg_pool) for later reuse.
with pg_pool.getconn().cursor() as cursor:
cursor.execute('SELECT NOW() as now')
results = cursor.fetchone()
return str(results[0])
# [END functions_sql_postgres]