528f3234e9
Abstract storage configuration section to load different database backend drivers. so we can keep supporting elasticsearch for a while after moving to oslo.db also this will help in adding API v2 as the elasticsearch driver will be changed. Each db driver will register it's configuration on the run time. Change-Id: Ie861e569f4add783c6f580cd0c08ed0fb3440151
74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
"""
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(c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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from freezer_api.storage import elastic
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from oslo_config import cfg
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from oslo_log import log
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from oslo_utils import importutils
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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# storage backend options to be registered
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_OPTS = [
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cfg.StrOpt("backend",
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help="Databse backend section name. This section "
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"will be loaded by the proper driver to connect to "
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"the database."
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),
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cfg.StrOpt('driver',
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default='freezer_api.storage.elastic.ElasticSearchEngine',
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help="Database driver to be used."
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)
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]
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def register_storage_opts():
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"""Register storage configuration options"""
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opt_group = cfg.OptGroup(name='storage',
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title='Freezer Storage Engine')
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CONF.register_group(opt_group)
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CONF.register_opts(_OPTS, group=opt_group)
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def get_db():
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"""Automatically loads the database driver to be used."""
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storage = CONF.get('storage')
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driver_instance = importutils.import_object(
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storage['driver'],
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backend=storage['backend']
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)
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return driver_instance
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def get_storage_opts():
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"""Returns a dict that contains list of options for db backend"""
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opts = {"storage": _OPTS}
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opts.update(_get_elastic_opts())
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return opts
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def _get_elastic_opts(backend=None):
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"""Return Opts for elasticsearch driver"""
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if not backend:
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backend = "elasticsearch"
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es = elastic.ElasticSearchEngine(backend=backend)
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return {backend: es.get_opts()}
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