old_contents: # Copyright 2015, Thales Services SAS
  # 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.
  
  import logging
  
  from django.urls import reverse
  from django.utils.translation import ugettext_lazy as _
  from neutronclient.common import exceptions as neutron_exc
  
  from horizon import exceptions
  from horizon import forms
  from horizon import messages
  
  from openstack_dashboard.api import neutron as api
  
  LOG = logging.getLogger(__name__)
  
  
  class AddRouterRoute(forms.SelfHandlingForm):
      destination = forms.IPField(label=_("Destination CIDR"), mask=True)
      nexthop = forms.IPField(label=_("Next Hop"))
      failure_url = 'horizon:project:routers:detail'
  
      def handle(self, request, data, **kwargs):
          router_id = self.initial['router_id']
          try:
              route = {'nexthop': data['nexthop'],
                       'destination': data['destination']}
              api.router_static_route_add(request,
                                          router_id,
                                          route)
              msg = _('Static route added')
              messages.success(request, msg)
              return True
          except neutron_exc.BadRequest as e:
              LOG.info('Invalid format for routes %(route)s: %(exc)s',
                       {'route': route, 'exc': e})
              msg = _('Invalid format for routes: %s') % e
              messages.error(request, msg)
              redirect = reverse(self.failure_url, args=[router_id])
              exceptions.handle(request, msg, redirect=redirect)
          except Exception as e:
              LOG.info('Failed to add route: %s', e)
              msg = _('Failed to add route: %s') % e
              messages.error(request, msg)
              redirect = reverse(self.failure_url, args=[router_id])
              exceptions.handle(request, msg, redirect=redirect)
  
new_contents: # Copyright 2015, Thales Services SAS
  # 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.
  
  import logging
  
  from django.urls import reverse
  from django.utils.translation import ugettext_lazy as _
  from neutronclient.common import exceptions as neutron_exc
  
  from horizon import exceptions
  from horizon import forms
  from horizon import messages
  
  from openstack_dashboard.api import neutron as api
  
  LOG = logging.getLogger(__name__)
  
  
  class AddRouterRoute(forms.SelfHandlingForm):
      destination = forms.IPField(label=_("Destination CIDR"), mask=True)
      nexthop = forms.IPField(label=_("Next Hop"))
      failure_url = 'horizon:project:routers:detail'
  
      def handle(self, request, data, **kwargs):
          router_id = self.initial['router_id']
          try:
              route = {'nexthop': data['nexthop'],
                       'destination': data['destination']}
              api.router_static_route_add(request,
                                          router_id,
                                          route)
              msg = _('Static route added')
              messages.success(request, msg)
              return True
          except neutron_exc.BadRequest as e:
              LOG.info('Invalid format for routes %(route)s: %(exc)s',
                       {'route': route, 'exc': e})
              msg = _('Invalid format for routes: %s') % e
              redirect = reverse(self.failure_url, args=[router_id])
              exceptions.handle(request, msg, redirect=redirect)
          except Exception as e:
              LOG.info('Failed to add route: %s', e)
              msg = _('Failed to add route: %s') % e
              redirect = reverse(self.failure_url, args=[router_id])
              exceptions.handle(request, msg, redirect=redirect)
  
subject: Remove the function of messages.error in AddRouterRoute