84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2012 Rackspace Hosting
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# Copyright (c) 2013 NetApp
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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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"""
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Configuration support for all drivers.
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This module allows support for setting configurations either from default
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or from a particular CONF group, to be able to set multiple configurations
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for a given set of values.
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For instance, two generic configurations can be set by naming them in groups as
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[generic1]
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share_backend_name=generic-backend-1
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...
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[generic2]
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share_backend_name=generic-backend-2
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...
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And the configuration group name will be passed in so that all calls to
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configuration.volume_group within that instance will be mapped to the proper
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named group.
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This class also ensures the implementation's configuration is grafted into the
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option group. This is due to the way cfg works. All cfg options must be defined
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and registered in the group in which they are used.
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"""
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from oslo_config import cfg
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from oslo_log import log
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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class Configuration(object):
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def __init__(self, share_opts, config_group=None):
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"""Graft config values into config group.
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This takes care of grafting the implementation's config values
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into the config group.
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"""
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self.config_group = config_group
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# set the local conf so that __call__'s know what to use
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if self.config_group:
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self._ensure_config_values(share_opts)
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self.local_conf = CONF._get(self.config_group)
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else:
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self.local_conf = CONF
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def _ensure_config_values(self, share_opts):
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CONF.register_opts(share_opts,
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group=self.config_group)
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def append_config_values(self, share_opts):
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self._ensure_config_values(share_opts)
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def safe_get(self, value):
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try:
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return self.__getattr__(value)
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except cfg.NoSuchOptError:
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return None
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def __getattr__(self, value):
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return getattr(self.local_conf, value)
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