text: #
  # Copyright 2012 Red Hat, Inc
  #
  # 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.
  """Handler for producing image metering messages from glance notification
     events.
  """
  
  import oslo.messaging
  from oslo_config import cfg
  
  from ceilometer.agent import plugin_base
  from ceilometer import sample
  
  OPTS = [
      cfg.StrOpt('glance_control_exchange',
                 default='glance',
                 help="Exchange name for Glance notifications."),
  ]
  
  
  cfg.CONF.register_opts(OPTS)
  
  
  class ImageBase(plugin_base.NotificationBase):
      """Base class for image counting."""
  
      @staticmethod
      def get_targets(conf):
          """Return a sequence of oslo.messaging.Target
  
          This sequence is defining the exchange and topics to be connected for
          this plugin.
          """
          return [oslo.messaging.Target(topic=topic,
                                        exchange=conf.glance_control_exchange)
                  for topic in conf.notification_topics]
  
  
  class ImageCRUDBase(ImageBase):
      event_types = [
          'image.update',
          'image.upload',
          'image.delete',
      ]
  
  
  class ImageCRUD(ImageCRUDBase):
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name=message['event_type'],
              type=sample.TYPE_DELTA,
              unit='image',
              volume=1,
              resource_id=message['payload']['id'],
              user_id=None,
              project_id=message['payload']['owner'],
              message=message)
  
  
  class Image(ImageCRUDBase):
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='image',
              type=sample.TYPE_GAUGE,
              unit='image',
              volume=1,
              resource_id=message['payload']['id'],
              user_id=None,
              project_id=message['payload']['owner'],
              message=message)
  
  
  class ImageSize(ImageCRUDBase):
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='image.size',
              type=sample.TYPE_GAUGE,
              unit='B',
              volume=message['payload']['size'],
              resource_id=message['payload']['id'],
              user_id=None,
              project_id=message['payload']['owner'],
              message=message)
  
  
  class ImageDownload(ImageBase):
      """Emit image_download sample when an image is downloaded."""
      event_types = ['image.send']
  
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='image.download',
              type=sample.TYPE_DELTA,
              unit='B',
              volume=message['payload']['bytes_sent'],
              resource_id=message['payload']['image_id'],
              user_id=message['payload']['receiver_user_id'],
              project_id=message['payload']['receiver_tenant_id'],
              message=message)
  
  
  class ImageServe(ImageBase):
      """Emit image_serve sample when an image is served out."""
      event_types = ['image.send']
  
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='image.serve',
              type=sample.TYPE_DELTA,
              unit='B',
              volume=message['payload']['bytes_sent'],
              resource_id=message['payload']['image_id'],
              user_id=None,
              project_id=message['payload']['owner_id'],
              message=message)
  