45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Base class for classes that need modular database access."""
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from oslo_config import cfg
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from oslo_utils import importutils
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# NOTE(sdague): we know of at least 1 instance of out of tree usage
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# for this config in RAX. They used this because of performance issues
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# with some queries. We think the right path forward is fixing the
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# SQLA queries to be more performant for everyone.
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db_driver_opt = cfg.StrOpt(
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'db_driver',
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default='nova.db',
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help='DEPRECATED: The driver to use for database access',
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deprecated_for_removal=True)
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CONF = cfg.CONF
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CONF.register_opt(db_driver_opt)
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class Base(object):
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"""DB driver is injected in the init method."""
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def __init__(self, db_driver=None):
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super(Base, self).__init__()
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if not db_driver:
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db_driver = CONF.db_driver
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self.db = importutils.import_module(db_driver)
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