text: # Copyright (c) 2015 Red Hat, Inc.
  #
  #    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 debtcollector import moves
  from oslo_config import cfg
  from ovsdbapp.backend.ovs_idl import command
  from ovsdbapp.backend.ovs_idl import connection
  from ovsdbapp.backend.ovs_idl import idlutils
  from ovsdbapp.backend.ovs_idl import transaction
  from ovsdbapp.backend.ovs_idl import vlog
  from ovsdbapp.schema.open_vswitch import impl_idl
  
  from neutron.agent.ovsdb.native import connection as n_connection
  from neutron.conf.agent import ovs_conf
  from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants
  
  NeutronOVSDBTransaction = moves.moved_class(
      impl_idl.OvsVsctlTransaction,
      'NeutronOVSDBTransaction',
      __name__)
  
  VswitchdInterfaceAddException = moves.moved_class(
      impl_idl.VswitchdInterfaceAddException,
      'VswitchdInterfaceAddException',
      __name__)
  
  Transaction = moves.moved_class(transaction.Transaction,
                                  'Transaction', __name__)
  
  ovs_conf.register_ovs_agent_opts()
  _connection = None
  
  
  def api_factory(context):
      global _connection
      if _connection is None:
          _connection = connection.Connection(
              idl=n_connection.idl_factory(),
              timeout=cfg.CONF.OVS.ovsdb_timeout)
      return NeutronOvsdbIdl(_connection)
  
  
  class OvsCleanup(command.BaseCommand):
      def __init__(self, api, bridge, all_ports=False):
          super(OvsCleanup, self).__init__(api)
          self.bridge = bridge
          self.all_ports = all_ports
  
      def run_idl(self, txn):
          br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
          for port in br.ports:
              if not any(self.is_deletable_port(iface)
                         for iface in port.interfaces):
                  continue
              br.delvalue('ports', port)
              for iface in port.interfaces:
                  iface.delete()
              port.delete()
  
      def is_deletable_port(self, port):
          # Deletable defined as "looks like vif port and not set to skip delete"
          if self.all_ports:
              return True
          if constants.SKIP_CLEANUP in port.external_ids:
              return False
          if not all(field in port.external_ids
                     for field in ('iface-id', 'attached-mac')):
              return False
          return True
  
  
  class NeutronOvsdbIdl(impl_idl.OvsdbIdl):
      def __init__(self, connection):
          vlog.use_python_logger()
          super(NeutronOvsdbIdl, self).__init__(connection)
  
      def ovs_cleanup(self, bridges, all_ports=False):
          return OvsCleanup(self, bridges, all_ports)
  