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OpenStack Study: extended_volumes.py**** CubicPower OpenStack Study ****
# Copyright 2013 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. """The Extended Volumes API extension.""" from nova.api.openstack import extensions from nova.api.openstack import wsgi from nova.api.openstack import xmlutil from nova import compute from nova.objects import block_device as block_device_obj authorize = extensions.soft_extension_authorizer('compute', 'extended_volumes')
**** CubicPower OpenStack Study **** class ExtendedVolumesController(wsgi.Controller):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(ExtendedVolumesController, self).__init__(*args, **kwargs) self.compute_api = compute.API()
**** CubicPower OpenStack Study **** def _extend_server(self, context, server, instance): bdms = block_device_obj.BlockDeviceMappingList.get_by_instance_uuid( context, instance['uuid']) volume_ids = [bdm.volume_id for bdm in bdms if bdm.volume_id] key = "%s:volumes_attached" % Extended_volumes.alias server[key] = [{'id': volume_id} for volume_id in volume_ids] @wsgi.extends
**** CubicPower OpenStack Study **** def show(self, req, resp_obj, id): context = req.environ['nova.context'] if authorize(context): # Attach our slave template to the response object resp_obj.attach(xml=ExtendedVolumesServerTemplate()) server = resp_obj.obj['server'] db_instance = req.get_db_instance(server['id']) # server['id'] is guaranteed to be in the cache due to # the core API adding it in its 'show' method. self._extend_server(context, server, db_instance) @wsgi.extends
**** CubicPower OpenStack Study **** def detail(self, req, resp_obj): context = req.environ['nova.context'] if authorize(context): # Attach our slave template to the response object resp_obj.attach(xml=ExtendedVolumesServersTemplate()) servers = list(resp_obj.obj['servers']) for server in servers: db_instance = req.get_db_instance(server['id']) # server['id'] is guaranteed to be in the cache due to # the core API adding it in its 'detail' method. self._extend_server(context, server, db_instance)
**** CubicPower OpenStack Study **** class Extended_volumes(extensions.ExtensionDescriptor): """Extended Volumes support.""" name = "ExtendedVolumes" alias = "os-extended-volumes" namespace = ("http://docs.openstack.org/compute/ext/" "extended_volumes/api/v1.1") updated = "2013-06-07T00:00:00+00:00"
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = ExtendedVolumesController() extension = extensions.ControllerExtension(self, 'servers', controller) return [extension]
**** CubicPower OpenStack Study **** def get_resources(self): return [] def make_server(elem): volumes = xmlutil.SubTemplateElement( elem, '{%s}volume_attached' % Extended_volumes.namespace, selector='%s:volumes_attached' % Extended_volumes.alias) volumes.set('id')
**** CubicPower OpenStack Study **** def make_server(elem): volumes = xmlutil.SubTemplateElement( elem, '{%s}volume_attached' % Extended_volumes.namespace, selector='%s:volumes_attached' % Extended_volumes.alias) volumes.set('id')
**** CubicPower OpenStack Study **** class ExtendedVolumesServerTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('server', selector='server') make_server(root) return xmlutil.SlaveTemplate(root, 1, nsmap={ Extended_volumes.alias: Extended_volumes.namespace})
**** CubicPower OpenStack Study **** class ExtendedVolumesServersTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('servers') elem = xmlutil.SubTemplateElement(root, 'server', selector='servers') make_server(elem) return xmlutil.SlaveTemplate(root, 1, nsmap={ Extended_volumes.alias: Extended_volumes.namespace})
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