content: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you 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.
  
  package com.cloud.hypervisor.kvm.resource.wrapper;
  
  import java.util.List;
  
  import org.libvirt.Connect;
  import org.libvirt.Domain;
  import org.libvirt.LibvirtException;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.ReplugNicAnswer;
  import com.cloud.agent.api.ReplugNicCommand;
  import com.cloud.agent.api.to.NicTO;
  import com.cloud.exception.InternalErrorException;
  import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
  import com.cloud.hypervisor.kvm.resource.LibvirtVMDef.InterfaceDef;
  import com.cloud.hypervisor.kvm.resource.VifDriver;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  
  @ResourceWrapper(handles =  ReplugNicCommand.class)
  public final class LibvirtReplugNicCommandWrapper extends CommandWrapper<ReplugNicCommand, Answer, LibvirtComputingResource> {
  
      public enum DomainAffect {
          CURRENT(0), LIVE(1), CONFIG(2), BOTH(3);
  
          private int value;
          DomainAffect(int value) {
              this.value = value;
          }
  
          public int getValue() {
              return value;
          }
      }
  
      @Override
      public Answer execute(final ReplugNicCommand command, final LibvirtComputingResource libvirtComputingResource) {
          final NicTO nic = command.getNic();
          final String vmName = command.getVmName();
          Domain vm = null;
          try {
              final LibvirtUtilitiesHelper libvirtUtilitiesHelper = libvirtComputingResource.getLibvirtUtilitiesHelper();
              final Connect conn = libvirtUtilitiesHelper.getConnectionByVmName(vmName);
              vm = libvirtComputingResource.getDomain(conn, vmName);
  
              InterfaceDef oldPluggedNic = findPluggedNic(libvirtComputingResource, nic, vmName, conn);
  
              final VifDriver newVifDriver = libvirtComputingResource.getVifDriver(nic.getType(), nic.getName());
              final InterfaceDef interfaceDef = newVifDriver.plug(nic, "Other PV", oldPluggedNic.getModel().toString(), null);
              if (command.getDetails() != null) {
                  libvirtComputingResource.setInterfaceDefQueueSettings(command.getDetails(), null, interfaceDef);
              }
              interfaceDef.setSlot(oldPluggedNic.getSlot());
              interfaceDef.setDevName(oldPluggedNic.getDevName());
              interfaceDef.setLinkStateUp(false);
  
              oldPluggedNic.setSlot(null);
  
              int i = 0;
              do {
                  i++;
                  logger.debug("ReplugNic: Detaching interface" + oldPluggedNic + " (Attempt: " + i + ")");
                  vm.detachDevice(oldPluggedNic.toString());
              } while (findPluggedNic(libvirtComputingResource, nic, vmName, conn) != null && i <= 10);
  
              logger.debug("ReplugNic: Attaching interface" + interfaceDef);
              vm.attachDevice(interfaceDef.toString());
  
              interfaceDef.setLinkStateUp(true);
              logger.debug("ReplugNic: Updating interface" + interfaceDef);
              vm.updateDeviceFlags(interfaceDef.toString(), DomainAffect.LIVE.getValue());
  
              // We don't know which "traffic type" is associated with
              // each interface at this point, so inform all vif drivers
              for (final VifDriver vifDriver : libvirtComputingResource.getAllVifDrivers()) {
                  vifDriver.unplug(oldPluggedNic, true);
              }
  
              return new ReplugNicAnswer(command, true, "success");
          } catch (final LibvirtException | InternalErrorException e) {
              final String msg = " Plug Nic failed due to " + e.toString();
              logger.warn(msg, e);
              return new ReplugNicAnswer(command, false, msg);
          } finally {
              if (vm != null) {
                  try {
                      vm.free();
                  } catch (final LibvirtException l) {
                      logger.trace("Ignoring libvirt error.", l);
                  }
              }
          }
      }
  
      private InterfaceDef findPluggedNic(LibvirtComputingResource libvirtComputingResource, NicTO nic, String vmName, Connect conn) {
          InterfaceDef oldPluggedNic = null;
  
          final List<InterfaceDef> pluggedNics = libvirtComputingResource.getInterfaces(conn, vmName);
  
          for (final InterfaceDef pluggedNic : pluggedNics) {
              if (pluggedNic.getMacAddress().equalsIgnoreCase(nic.getMac())) {
                  oldPluggedNic = pluggedNic;
              }
          }
  
          return oldPluggedNic;
      }
  }
  