55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
# 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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from oslo_concurrency import lockutils
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from oslo_db.sqlalchemy import enginefacade
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_synchronized = lockutils.synchronized_with_prefix("neutron-")
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_CTX_MANAGER = None
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@_synchronized("context-manager")
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def _create_context_manager():
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global _CTX_MANAGER
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if _CTX_MANAGER is None:
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_CTX_MANAGER = enginefacade.transaction_context()
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_CTX_MANAGER.configure(sqlite_fk=True, flush_on_subtransaction=True)
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return _CTX_MANAGER
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def get_context_manager():
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"""Transaction Context Manager accessor.
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:returns: The transaction context manager.
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"""
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if _CTX_MANAGER is None:
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return _create_context_manager()
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return _CTX_MANAGER
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def get_reader_session():
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"""Helper to get reader session.
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:returns: The reader session.
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"""
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return get_context_manager().reader.get_sessionmaker()()
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def get_writer_session():
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"""Helper to get writer session.
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:returns: The writer session.
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"""
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return get_context_manager().writer.get_sessionmaker()()
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