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OpenStack Study: extension_info.py**** CubicPower OpenStack Study ****
# # 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 # # http://www.apache.org/licenses/LICENSE-2.0 # # 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. import webob.exc from nova.api.openstack import extensions from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class ExtensionInfoController(object):
**** CubicPower OpenStack Study **** def __init__(self, extension_info): self.extension_info = extension_info
**** CubicPower OpenStack Study **** def _translate(self, ext): ext_data = {} ext_data['name'] = ext.name ext_data['alias'] = ext.alias ext_data['description'] = ext.__doc__ ext_data['version'] = ext.version return ext_data
**** CubicPower OpenStack Study **** def _get_extensions(self, context): """Filter extensions list based on policy.""" discoverable_extensions = dict() for alias, ext in self.extension_info.get_extensions().iteritems(): authorize = extensions.soft_extension_authorizer( 'compute', 'v3:' + alias) if authorize(context, action='discoverable'): discoverable_extensions[alias] = ext else: LOG.debug(_("Filter out extension %s from discover list"), alias) return discoverable_extensions @extensions.expected_errors(())
**** CubicPower OpenStack Study **** def index(self, req): context = req.environ['nova.context'] sorted_ext_list = sorted( self._get_extensions(context).iteritems()) extensions = [] for _alias, ext in sorted_ext_list: extensions.append(self._translate(ext)) return dict(extensions=extensions) @extensions.expected_errors(404)
**** CubicPower OpenStack Study **** def show(self, req, id): context = req.environ['nova.context'] try: # NOTE(dprince): the extensions alias is used as the 'id' for show ext = self._get_extensions(context)[id] except KeyError: raise webob.exc.HTTPNotFound() return dict(extension=self._translate(ext))
**** CubicPower OpenStack Study **** class ExtensionInfo(extensions.V3APIExtensionBase): """Extension information.""" name = "extensions" alias = "extensions" version = 1
**** CubicPower OpenStack Study **** def get_resources(self): resources = [ extensions.ResourceExtension( 'extensions', ExtensionInfoController(self.extension_info), member_name='extension')] return resources
**** CubicPower OpenStack Study **** def get_controller_extensions(self): return []
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