Source code for glance.db.metadata

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright 2013 OpenStack Foundation
# Copyright 2013 Intel Corporation
#    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
#    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.

"""Metadata setup commands."""

import threading

from oslo_config import cfg
from oslo_db import options as db_options
from stevedore import driver

from glance.db.sqlalchemy import api as db_api

_IMPL = None
_LOCK = threading.Lock()


[docs]def get_backend(): global _IMPL if _IMPL is None: with _LOCK: if _IMPL is None: _IMPL = driver.DriverManager( "glance.database.metadata_backend", cfg.CONF.database.backend).driver return _IMPL
[docs]def load_metadefs(): """Read metadefinition files and insert data into the database""" return get_backend().db_load_metadefs(engine=db_api.get_engine(), metadata_path=None, merge=False, prefer_new=False, overwrite=False)
[docs]def unload_metadefs(): """Unload metadefinitions from database""" return get_backend().db_unload_metadefs(engine=db_api.get_engine())
[docs]def export_metadefs(): """Export metadefinitions from database to files""" return get_backend().db_export_metadefs(engine=db_api.get_engine(), metadata_path=None)