nova/nova/db/api/api.py

51 lines
1.5 KiB
Python

# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from oslo_db.sqlalchemy import enginefacade
from oslo_utils import importutils
import sqlalchemy as sa
import nova.conf
profiler_sqlalchemy = importutils.try_import('osprofiler.sqlalchemy')
CONF = nova.conf.CONF
context_manager = enginefacade.transaction_context()
# NOTE(stephenfin): We don't need equivalents of the 'get_context_manager' or
# 'create_context_manager' APIs found in 'nova.db.main.api' since we don't need
# to be cell-aware here
def _get_db_conf(conf_group, connection=None):
kw = dict(conf_group.items())
if connection is not None:
kw['connection'] = connection
return kw
def configure(conf):
context_manager.configure(**_get_db_conf(conf.api_database))
if (
profiler_sqlalchemy and
CONF.profiler.enabled and
CONF.profiler.trace_sqlalchemy
):
context_manager.append_on_engine_create(
lambda eng: profiler_sqlalchemy.add_tracing(sa, eng, "db"))
def get_engine():
return context_manager.writer.get_engine()