deb-cinder/cinder/db/base.py
Eric Harney 2cc0dbe393 Fix sqlalchemy reuse in multi-backend children
Multi-backend breaks because sqlalchemy objects
are shared between child backends.

When creating a new service (Base), call dispose
to reset the sqlalchemy object and connection.

Change-Id: I9d937c5b2fa850edc5523f26e031f59cad5a9e7e
Closes-Bug: #1417018
2015-03-12 09:49:48 -06:00

43 lines
1.5 KiB
Python

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""Base class for classes that need modular database access."""
from oslo_config import cfg
from oslo_utils import importutils
db_driver_opt = cfg.StrOpt('db_driver',
default='cinder.db',
help='Driver to use for database access')
CONF = cfg.CONF
CONF.register_opt(db_driver_opt)
class Base(object):
"""DB driver is injected in the init method."""
def __init__(self, db_driver=None):
# NOTE(mriedem): Without this call, multiple inheritance involving
# the db Base class does not work correctly.
super(Base, self).__init__()
if not db_driver:
db_driver = CONF.db_driver
self.db = importutils.import_module(db_driver) # pylint: disable=C0103
self.db.dispose_engine()