text: # Copyright (C) 2015 Ericsson AB
  # Copyright (c) 2015 Gigamon
  #
  # 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 neutron_lib import rpc as n_rpc
  from neutron_taas._i18n import _
  from oslo_config import cfg
  import oslo_messaging as messaging
  
  
  TaasOpts = [
      cfg.StrOpt(
          'driver',
          default='',
          help=_("Name of the TaaS Driver")),
      cfg.BoolOpt(
          'enabled',
          default=False,
          help=_("Enable TaaS")),
  ]
  cfg.CONF.register_opts(TaasOpts, 'taas')
  
  
  class TaasPluginApiMixin(object):
  
      # Currently there are no Calls the Agent makes towards the Plugin.
  
      def __init__(self, topic, host):
          self.host = host
          target = messaging.Target(topic=topic, version='1.0')
          self.client = n_rpc.get_client(target)
          super(TaasPluginApiMixin, self).__init__()
          return
  
  
  class TaasAgentRpcCallbackMixin(object):
      """Mixin for Taas agent Implementations."""
  
      def __init__(self):
          super(TaasAgentRpcCallbackMixin, self).__init__()
  
      def consume_api(self, agent_api):
          """Receive neutron agent API object
  
          Allows an extension to gain access to resources internal to the
          neutron agent and otherwise unavailable to the extension.
          """
          self.agent_api = agent_api
  
      def create_tap_service(self, context, tap_service, host):
          """Handle RPC cast from plugin to create a tap service."""
          pass
  
      def delete_tap_service(self, context, tap_service, host):
          """Handle RPC cast from plugin to delete a tap service."""
          pass
  
      def create_tap_flow(self, context, tap_flow_msg, host):
          """Handle RPC cast from plugin to create a tap flow"""
          pass
  
      def delete_tap_flow(self, context, tap_flow_msg, host):
          """Handle RPC cast from plugin to delete a tap flow"""
          pass
  