cde9f72198
There is no need to rerequest the volume object from the db in the extension because we already have a cached copy in the request. This can potentially save hundreds of db queries in list. Change-Id: I46da8c7b6c2af2435d246ebd8e95d4712065f1e7 Resolves-bug: 1308255
94 lines
3.8 KiB
Python
94 lines
3.8 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 cinder.api import extensions
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from cinder.api.openstack import wsgi
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from cinder.api import xmlutil
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from cinder import volume
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authorize = extensions.soft_extension_authorizer('volume',
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'volume_mig_status_attribute')
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class VolumeMigStatusAttributeController(wsgi.Controller):
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def __init__(self, *args, **kwargs):
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super(VolumeMigStatusAttributeController, self).__init__(*args,
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**kwargs)
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self.volume_api = volume.API()
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def _add_volume_mig_status_attribute(self, req, context, resp_volume):
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db_volume = req.cached_resource_by_id(resp_volume['id'])
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key = "%s:migstat" % Volume_mig_status_attribute.alias
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resp_volume[key] = db_volume['migration_status']
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key = "%s:name_id" % Volume_mig_status_attribute.alias
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resp_volume[key] = db_volume['_name_id']
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@wsgi.extends
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def show(self, req, resp_obj, id):
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context = req.environ['cinder.context']
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if authorize(context):
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resp_obj.attach(xml=VolumeMigStatusAttributeTemplate())
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self._add_volume_mig_status_attribute(req, context,
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resp_obj.obj['volume'])
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@wsgi.extends
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def detail(self, req, resp_obj):
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context = req.environ['cinder.context']
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if authorize(context):
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resp_obj.attach(xml=VolumeListMigStatusAttributeTemplate())
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for volume in list(resp_obj.obj['volumes']):
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self._add_volume_mig_status_attribute(req, context, volume)
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class Volume_mig_status_attribute(extensions.ExtensionDescriptor):
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"""Expose migration_status as an attribute of a volume."""
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name = "VolumeMigStatusAttribute"
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alias = "os-vol-mig-status-attr"
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namespace = ("http://docs.openstack.org/volume/ext/"
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"volume_mig_status_attribute/api/v1")
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updated = "2013-08-08T00:00:00+00:00"
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def get_controller_extensions(self):
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controller = VolumeMigStatusAttributeController()
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extension = extensions.ControllerExtension(self, 'volumes', controller)
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return [extension]
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def make_volume(elem):
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elem.set('{%s}migstat' % Volume_mig_status_attribute.namespace,
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'%s:migstat' % Volume_mig_status_attribute.alias)
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elem.set('{%s}name_id' % Volume_mig_status_attribute.namespace,
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'%s:name_id' % Volume_mig_status_attribute.alias)
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class VolumeMigStatusAttributeTemplate(xmlutil.TemplateBuilder):
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def construct(self):
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root = xmlutil.TemplateElement('volume', selector='volume')
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make_volume(root)
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alias = Volume_mig_status_attribute.alias
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namespace = Volume_mig_status_attribute.namespace
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return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
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class VolumeListMigStatusAttributeTemplate(xmlutil.TemplateBuilder):
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def construct(self):
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root = xmlutil.TemplateElement('volumes')
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elem = xmlutil.SubTemplateElement(root, 'volume', selector='volumes')
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make_volume(elem)
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alias = Volume_mig_status_attribute.alias
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namespace = Volume_mig_status_attribute.namespace
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return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
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