text: # -*- encoding: utf-8 -*-
  #
  # Copyright © 2012 New Dream Network, LLC (DreamHost)
  #
  # Author: Julien Danjou <julien@danjou.info>
  #
  # 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.
  """Converters for producing volume counter messages from cinder notification
  events.
  """
  
  from oslo.config import cfg
  
  from ceilometer import plugin
  from ceilometer import sample
  
  
  OPTS = [
      cfg.StrOpt('cinder_control_exchange',
                 default='cinder',
                 help="Exchange name for Cinder notifications."),
  ]
  
  
  cfg.CONF.register_opts(OPTS)
  
  
  class _Base(plugin.NotificationBase):
      """Convert volume notifications into Counters."""
  
      event_types = [
          'volume.exists',
          'volume.create.*',
          'volume.delete.*',
          'volume.resize.*',
      ]
  
      @staticmethod
      def get_exchange_topics(conf):
          """Return a sequence of ExchangeTopics defining the exchange and
          topics to be connected for this plugin.
          """
          return [
              plugin.ExchangeTopics(
                  exchange=conf.cinder_control_exchange,
                  topics=set(topic + ".info"
                             for topic in conf.notification_topics)),
          ]
  
  
  class Volume(_Base):
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='volume',
              type=sample.TYPE_GAUGE,
              unit='volume',
              volume=1,
              user_id=message['payload']['user_id'],
              project_id=message['payload']['tenant_id'],
              resource_id=message['payload']['volume_id'],
              message=message)
  
  
  class VolumeSize(_Base):
      def process_notification(self, message):
          yield sample.Sample.from_notification(
              name='volume.size',
              type=sample.TYPE_GAUGE,
              unit='GB',
              volume=message['payload']['size'],
              user_id=message['payload']['user_id'],
              project_id=message['payload']['tenant_id'],
              resource_id=message['payload']['volume_id'],
              message=message)
  