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OpenStack Study: volume_host_attribute.py**** CubicPower OpenStack Study ****
# Copyright 2012 OpenStack Foundation # # 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. from cinder.api import extensions from cinder.api.openstack import wsgi from cinder.api import xmlutil from cinder.openstack.common import log as logging from cinder import volume LOG = logging.getLogger(__name__) authorize = extensions.soft_extension_authorizer('volume', 'volume_host_attribute')
**** CubicPower OpenStack Study **** class VolumeHostAttributeController(wsgi.Controller):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(VolumeHostAttributeController, self).__init__(*args, **kwargs) self.volume_api = volume.API()
**** CubicPower OpenStack Study **** def _add_volume_host_attribute(self, context, req, resp_volume): db_volume = req.cached_resource_by_id(resp_volume['id']) key = "%s:host" % Volume_host_attribute.alias resp_volume[key] = db_volume['host'] @wsgi.extends
**** CubicPower OpenStack Study **** def show(self, req, resp_obj, id): context = req.environ['cinder.context'] if authorize(context): resp_obj.attach(xml=VolumeHostAttributeTemplate()) volume = resp_obj.obj['volume'] self._add_volume_host_attribute(context, req, volume) @wsgi.extends
**** CubicPower OpenStack Study **** def detail(self, req, resp_obj): context = req.environ['cinder.context'] if authorize(context): resp_obj.attach(xml=VolumeListHostAttributeTemplate()) for volume in list(resp_obj.obj['volumes']): self._add_volume_host_attribute(context, req, volume)
**** CubicPower OpenStack Study **** class Volume_host_attribute(extensions.ExtensionDescriptor): """Expose host as an attribute of a volume.""" name = "VolumeHostAttribute" alias = "os-vol-host-attr" namespace = ("http://docs.openstack.org/volume/ext/" "volume_host_attribute/api/v1") updated = "2011-11-03T00:00:00+00:00"
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = VolumeHostAttributeController() extension = extensions.ControllerExtension(self, 'volumes', controller) return [extension] def make_volume(elem): elem.set('{%s}host' % Volume_host_attribute.namespace, '%s:host' % Volume_host_attribute.alias)
**** CubicPower OpenStack Study **** def make_volume(elem): elem.set('{%s}host' % Volume_host_attribute.namespace, '%s:host' % Volume_host_attribute.alias)
**** CubicPower OpenStack Study **** class VolumeHostAttributeTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('volume', selector='volume') make_volume(root) alias = Volume_host_attribute.alias namespace = Volume_host_attribute.namespace return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
**** CubicPower OpenStack Study **** class VolumeListHostAttributeTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('volumes') elem = xmlutil.SubTemplateElement(root, 'volume', selector='volumes') make_volume(elem) alias = Volume_host_attribute.alias namespace = Volume_host_attribute.namespace return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
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