text: # Copyright 2012 NEC Corporation
  #
  #    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.
  
  """
  Views for managing Neutron Networks.
  """
  from django.conf import settings
  from django.urls import reverse
  from django.urls import reverse_lazy
  from django.utils.translation import ugettext_lazy as _
  
  from horizon import exceptions
  from horizon import forms
  from horizon import tables
  from horizon import tabs
  from horizon.utils import memoized
  from horizon import workflows
  
  from openstack_dashboard import api
  from openstack_dashboard.utils import filters
  
  from openstack_dashboard.dashboards.project.networks \
      import forms as project_forms
  from openstack_dashboard.dashboards.project.networks \
      import tables as project_tables
  from openstack_dashboard.dashboards.project.networks import tabs \
      as network_tabs
  from openstack_dashboard.dashboards.project.networks \
      import workflows as project_workflows
  
  
  class IndexView(tables.DataTableView):
      table_class = project_tables.NetworksTable
      page_title = _("Networks")
      FILTERS_MAPPING = {'shared': {_("yes"): True, _("no"): False},
                         'router:external': {_("yes"): True, _("no"): False},
                         'admin_state_up': {_("up"): True, _("down"): False}}
  
      def get_data(self):
          try:
              tenant_id = self.request.user.tenant_id
              search_opts = self.get_filters(filters_map=self.FILTERS_MAPPING)
              networks = api.neutron.network_list_for_tenant(
                  self.request, tenant_id, include_external=True, **search_opts)
          except Exception:
              networks = []
              msg = _('Network list can not be retrieved.')
              exceptions.handle(self.request, msg)
          return networks
  
  
  class DefaultSubnetWorkflowMixin(object):
  
      def get_default_dns_servers(self):
          # this returns the default dns servers to be used for new subnets
          dns_default = "\n".join(getattr(settings, 'OPENSTACK_NEUTRON_NETWORK',
                                          {}).get('default_dns_nameservers', ''))
          return dns_default
  
  
  class CreateView(DefaultSubnetWorkflowMixin, workflows.WorkflowView):
      workflow_class = project_workflows.CreateNetwork
  
      def get_initial(self):
          results = super(CreateView, self).get_initial()
          results['dns_nameservers'] = self.get_default_dns_servers()
          return results
  
  
  class UpdateView(forms.ModalFormView):
      context_object_name = 'network'
      form_class = project_forms.UpdateNetwork
      form_id = "update_network_form"
      submit_label = _("Save Changes")
      submit_url = "horizon:project:networks:update"
      success_url = reverse_lazy("horizon:project:networks:index")
      template_name = 'project/networks/update.html'
      page_title = _("Edit Network")
  
      def get_context_data(self, **kwargs):
          context = super(UpdateView, self).get_context_data(**kwargs)
          args = (self.kwargs['network_id'],)
          context["network_id"] = self.kwargs['network_id']
          context["submit_url"] = reverse(self.submit_url, args=args)
          return context
  
      @memoized.memoized_method
      def _get_object(self, *args, **kwargs):
          network_id = self.kwargs['network_id']
          try:
              # no subnet values are read or editable in this view, so
              # save the subnet expansion overhead
              return api.neutron.network_get(self.request, network_id,
                                             expand_subnet=False)
          except Exception:
              redirect = self.success_url
              msg = _('Unable to retrieve network details.')
              exceptions.handle(self.request, msg, redirect=redirect)
  
      def get_initial(self):
          network = self._get_object()
          return {'network_id': network['id'],
                  'tenant_id': network['tenant_id'],
                  'name': network['name'],
                  'admin_state': network['admin_state_up'],
                  'shared': network['shared']}
  
  
  class DetailView(tabs.TabbedTableView):
      tab_group_class = network_tabs.NetworkDetailsTabs
      template_name = 'horizon/common/_detail.html'
      page_title = '{{ network.name | default:network.id }}'
  
      @staticmethod
      def get_redirect_url():
          return reverse('horizon:project:networks:index')
  
      @memoized.memoized_method
      def _get_data(self):
          try:
              network_id = self.kwargs['network_id']
              network = api.neutron.network_get(self.request, network_id)
              network.set_id_as_name_if_empty(length=0)
          except Exception:
              msg = _('Unable to retrieve details for network "%s".') \
                  % (network_id)
              exceptions.handle(self.request, msg,
                                redirect=self.get_redirect_url())
          return network
  
      def get_subnets_data(self):
          # MultiTableMixin requires this method to be defined
          pass
  
      def get_context_data(self, **kwargs):
          context = super(DetailView, self).get_context_data(**kwargs)
          network = self._get_data()
          context["network"] = network
          table = project_tables.NetworksTable(self.request)
          context["url"] = self.get_redirect_url()
          context["actions"] = table.render_row_actions(network)
          choices = project_tables.STATUS_DISPLAY_CHOICES
          network.status_label = (
              filters.get_display_label(choices, network.status))
          choices = project_tables.DISPLAY_CHOICES
          network.admin_state_label = (
              filters.get_display_label(choices, network.admin_state))
          return context
  