88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
# Copyright 2011 VMware, Inc.
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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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from oslo.config import cfg
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import sqlalchemy as sql
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from tacker.db import model_base
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from tacker.openstack.common.db.sqlalchemy import session
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from tacker.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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cfg.CONF.import_opt('connection',
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'tacker.openstack.common.db.options',
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group='database')
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_FACADE = None
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def _create_facade_lazily():
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global _FACADE
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if _FACADE is None:
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_FACADE = session.EngineFacade.from_config(
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cfg.CONF.database.connection, cfg.CONF, sqlite_fk=True)
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return _FACADE
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def configure_db():
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"""Configure database.
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Establish the database, create an engine if needed, and register
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the models.
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"""
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register_models()
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def clear_db(base=model_base.BASE):
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unregister_models(base)
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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):
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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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def register_models(base=model_base.BASE):
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"""Register Models and create properties."""
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try:
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facade = _create_facade_lazily()
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engine = facade.get_engine()
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base.metadata.create_all(engine)
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except sql.exc.OperationalError as e:
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LOG.info(_("Database registration exception: %s"), e)
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return False
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return True
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def unregister_models(base=model_base.BASE):
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"""Unregister Models, useful clearing out data before testing."""
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try:
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facade = _create_facade_lazily()
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engine = facade.get_engine()
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base.metadata.drop_all(engine)
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except Exception:
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LOG.exception(_("Database exception"))
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