text: # Copyright (c) 2013 OpenStack Foundation
  # 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 oslo_config import cfg
  from oslo_log import log as logging
  import oslo_messaging
  
  from neutron._i18n import _
  from neutron.common import rpc as n_rpc
  
  LOG = logging.getLogger(__name__)
  
  FWaaSOpts = [
      cfg.StrOpt(
          'driver',
          default='',
          help=_("Name of the FWaaS Driver")),
      cfg.BoolOpt(
          'enabled',
          default=False,
          help=_("Enable FWaaS")),
  ]
  cfg.CONF.register_opts(FWaaSOpts, 'fwaas')
  
  
  class FWaaSPluginApiMixin(object):
      """Agent side of the FWaaS agent to FWaaS Plugin RPC API."""
  
      def __init__(self, topic, host):
          self.host = host
          target = oslo_messaging.Target(topic=topic, version='1.0')
          self.client = n_rpc.get_client(target)
  
      def set_firewall_status(self, context, firewall_id, status):
          """Make a RPC to set the status of a firewall."""
          cctxt = self.client.prepare()
          return cctxt.call(context, 'set_firewall_status', host=self.host,
                            firewall_id=firewall_id, status=status)
  
      def firewall_deleted(self, context, firewall_id):
          """Make a RPC to indicate that the firewall resources are deleted."""
          cctxt = self.client.prepare()
          return cctxt.call(context, 'firewall_deleted', host=self.host,
                            firewall_id=firewall_id)
  
  
  class FWaaSAgentRpcCallbackMixin(object):
      """Mixin for FWaaS agent Implementations."""
  
      def __init__(self, host):
  
          super(FWaaSAgentRpcCallbackMixin, self).__init__(host)
  
      def create_firewall(self, context, firewall, host):
          """Handle RPC cast from plugin to create a firewall."""
          pass
  
      def update_firewall(self, context, firewall, host):
          """Handle RPC cast from plugin to update a firewall."""
          pass
  
      def delete_firewall(self, context, firewall, host):
          """Handle RPC cast from plugin to delete a firewall."""
          pass
  