text: # Copyright 2016 Mirantis Inc.
  # 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 django.utils.translation import ugettext_lazy as _
  
  from horizon import exceptions
  from horizon import tabs
  
  from openstack_dashboard import api
  from openstack_dashboard.dashboards.admin.networks.agents import tables
  
  
  class DHCPAgentsTab(tabs.TableTab):
      name = _("DHCP Agents")
      slug = "agents_tab"
      table_classes = (tables.DHCPAgentsTable,)
      template_name = "horizon/common/_detail_table.html"
      preload = False
  
      def get_agents_data(self):
          agents = []
          if api.neutron.is_extension_supported(self.request,
                                                'dhcp_agent_scheduler'):
              try:
                  network_id = self.tab_group.kwargs['network_id']
                  agents = api.neutron.list_dhcp_agent_hosting_networks(
                      self.request,
                      network_id)
              except Exception:
                  msg = _('Unable to list dhcp agents hosting network.')
                  exceptions.handle(self.request, msg)
          return agents
  