53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
# Copyright 2013 IBM Corp.
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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_log import log as logging
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from nova import exception
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from nova.i18n import _LE
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LOG = logging.getLogger(__name__)
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class LoadedExtensionInfo(object):
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"""Keep track of all loaded API extensions."""
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def __init__(self):
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self.extensions = {}
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def register_extension(self, ext):
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if not self._check_extension(ext):
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return False
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alias = ext.alias
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if alias in self.extensions:
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raise exception.NovaException("Found duplicate extension: %s"
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% alias)
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self.extensions[alias] = ext
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return True
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def _check_extension(self, extension):
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"""Checks for required methods in extension objects."""
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try:
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extension.is_valid()
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except AttributeError:
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LOG.exception(_LE("Exception loading extension"))
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return False
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return True
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def get_extensions(self):
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return self.extensions
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