54 lines
1.6 KiB
Python
54 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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"""Session Handling for SQLAlchemy backend."""
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from oslo_config import cfg
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from oslo_db.sqlalchemy import session
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from oslo_log import log as logging
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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_FACADES = {}
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def _create_facade_lazily(cfg_group, connection=None, discriminator=None):
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connection = connection or cfg.CONF[cfg_group].connection
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cache_name = "%s:%s" % (cfg_group, discriminator)
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if cache_name not in _FACADES:
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conf = dict(cfg.CONF[cfg_group].items())
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_FACADES[cache_name] = session.EngineFacade(
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connection,
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**conf
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)
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return _FACADES[cache_name]
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def get_engine(cfg_group):
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facade = _create_facade_lazily(cfg_group)
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return facade.get_engine()
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def get_session(cfg_group, connection=None, discriminator=None, **kwargs):
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facade = _create_facade_lazily(cfg_group, connection, discriminator)
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return facade.get_session(**kwargs)
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