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OpenStack Study: image_size.py**** CubicPower OpenStack Study ****
# Copyright 2013 Rackspace Hosting # All Rights Reserved. # # 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 nova.api.openstack import extensions from nova.api.openstack import wsgi from nova.api.openstack import xmlutil authorize = extensions.soft_extension_authorizer('compute', 'image_size')
**** CubicPower OpenStack Study **** def make_image(elem): elem.set('{%s}size' % Image_size.namespace, '%s:size' % Image_size.alias)
**** CubicPower OpenStack Study **** class ImagesSizeTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('images') elem = xmlutil.SubTemplateElement(root, 'image', selector='images') make_image(elem) return xmlutil.SlaveTemplate(root, 1, nsmap={ Image_size.alias: Image_size.namespace})
**** CubicPower OpenStack Study **** class ImageSizeTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('image', selector='image') make_image(root) return xmlutil.SlaveTemplate(root, 1, nsmap={ Image_size.alias: Image_size.namespace})
**** CubicPower OpenStack Study **** class ImageSizeController(wsgi.Controller):
**** CubicPower OpenStack Study **** def _extend_image(self, image, image_cache): key = "%s:size" % Image_size.alias image[key] = image_cache['size'] @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=ImageSizeTemplate()) image_resp = resp_obj.obj['image'] # image guaranteed to be in the cache due to the core API adding # it in its 'show' method image_cached = req.get_db_item('images', image_resp['id']) self._extend_image(image_resp, image_cached) @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=ImagesSizeTemplate()) images_resp = list(resp_obj.obj['images']) # images guaranteed to be in the cache due to the core API adding # it in its 'detail' method for image in images_resp: image_cached = req.get_db_item('images', image['id']) self._extend_image(image, image_cached)
**** CubicPower OpenStack Study **** class Image_size(extensions.ExtensionDescriptor): """Adds image size to image listings.""" name = "ImageSize" alias = "OS-EXT-IMG-SIZE" namespace = ("http://docs.openstack.org/compute/ext/" "image_size/api/v1.1") updated = "2013-02-19T00:00:00+00:00"
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = ImageSizeController() extension = extensions.ControllerExtension(self, 'images', controller) return [extension]
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