8be88da5c1
This change 'rehomes' model_base.py from neutron. This is not quite a verbatim copy due to the following differences: - The field sizes for columns are replaced with the new constants from neutron_lib/db/constants.py - The tenant_id deprecation message is adjusted slightly. - The StandardAttribute table is not included. We also add some base classes and fixtures for DB unit tests. Partially Implements: Blueprint neutron-lib Change-Id: I2087c6f5f66154cdaa4d8fa3d86f5e493f1d24d9
47 lines
1.4 KiB
Python
47 lines
1.4 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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"""
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TEMPORARY: use the old EngineFacade and lazy init.
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TODO(HenryG): replace this file with the new db/api.py from neutron.
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"""
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from oslo_config import cfg
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from oslo_db.sqlalchemy import session
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_FACADE = None
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def _create_facade_lazily():
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global _FACADE
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# NOTE: This is going to change with bug 1520719
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if _FACADE is None:
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_FACADE = session.EngineFacade.from_config(cfg.CONF, sqlite_fk=True)
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return _FACADE
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def get_engine():
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"""Helper method to grab engine."""
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facade = _create_facade_lazily()
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return facade.get_engine()
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def get_session(autocommit=True, expire_on_commit=False, use_slave=False):
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"""Helper method to grab session."""
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facade = _create_facade_lazily()
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return facade.get_session(autocommit=autocommit,
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expire_on_commit=expire_on_commit,
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use_slave=use_slave)
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