45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
# Copyright 2014 Intel Corporation
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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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import threading
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from oslo_db.sqlalchemy import enginefacade
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_CONTEXT = threading.local()
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_engine_facade = None
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def session_for_read():
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return _get_facade().reader.using(_CONTEXT)
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def session_for_write(sqlite_fk=False):
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return _get_facade(sqlite_fk=sqlite_fk).writer.using(_CONTEXT)
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def _clear_engine():
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global _engine_facade
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_engine_facade = None
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def _get_facade(sqlite_fk=False):
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global _engine_facade
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if not _engine_facade:
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ctx = enginefacade.transaction_context()
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ctx.configure(sqlite_fk=sqlite_fk)
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_engine_facade = ctx
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return _engine_facade
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