8980bf7da5
Since all Oslo library drivers are discoverable via stevedore, we should use stevedore in Castellan as well. This will make it easier for folks to write their own custom drivers. Stevedore uses setuptools entry points for implementing the common patterns for dynamically loading extensions. We add [key_manager]/backend as the new option to set the custom driver. For a while, we should support the older values that used to be specified using [key_manager]/apiclass. Change-Id: I2610459839806a5591da1efa314dfa52bcfb7cda
49 lines
1.9 KiB
Python
49 lines
1.9 KiB
Python
# Copyright (c) 2015 The Johns Hopkins University/Applied Physics Laboratory
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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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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import importutils
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from stevedore import driver
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from stevedore import exception
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LOG = logging.getLogger(__name__)
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key_manager_opts = [
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cfg.StrOpt('backend',
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default='barbican',
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deprecated_name='api_class',
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deprecated_group='key_manager',
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help='Specify the key manager implementation. Default is '
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'"barbican".Will support the values earlier set using '
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'[key_manager]/api_class for some time.'),
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]
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def API(configuration=None):
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conf = configuration or cfg.CONF
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conf.register_opts(key_manager_opts, group='key_manager')
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try:
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mgr = driver.DriverManager("castellan.drivers",
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conf.key_manager.backend,
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invoke_on_load=True,
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invoke_args=[conf])
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return mgr.driver
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except exception.NoMatches:
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LOG.warning("Deprecation Warning : %s is not a stevedore based driver,"
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" trying to load it as a class", conf.key_manager.backend)
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cls = importutils.import_class(conf.key_manager.backend)
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return cls(configuration=conf)
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