49 lines
1.7 KiB
Python
49 lines
1.7 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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"""Database context manager for placement database connection, kept in its
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own file so the nova db_api (which has cascading imports) is not imported.
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"""
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from oslo_db.sqlalchemy import enginefacade
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from oslo_log import log as logging
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from nova.utils import run_once
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placement_context_manager = enginefacade.transaction_context()
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LOG = logging.getLogger(__name__)
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def _get_db_conf(conf_group):
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return dict(conf_group.items())
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@run_once("TransactionFactory already started, not reconfiguring.",
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LOG.warning)
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def configure(conf):
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# If [placement_database]/connection is not set in conf, then placement
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# data will be stored in the nova_api database.
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if conf.placement_database.connection is None:
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placement_context_manager.configure(
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**_get_db_conf(conf.api_database))
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else:
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placement_context_manager.configure(
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**_get_db_conf(conf.placement_database))
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def get_placement_engine():
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return placement_context_manager.writer.get_engine()
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@enginefacade.transaction_context_provider
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class DbContext(object):
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"""Stub class for db session handling outside of web requests."""
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