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 java.util.Map;
  
  import org.apache.cloudstack.storage.to.VolumeObjectTO;
  import org.libvirt.Connect;
  import org.libvirt.Domain;
  import org.libvirt.LibvirtException;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.RestoreVMSnapshotAnswer;
  import com.cloud.agent.api.RestoreVMSnapshotCommand;
  import com.cloud.agent.api.VMSnapshotTO;
  import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.cloud.vm.VirtualMachine;
  
  @ResourceWrapper(handles =  RestoreVMSnapshotCommand.class)
  public final class LibvirtRestoreVMSnapshotCommandWrapper extends CommandWrapper<RestoreVMSnapshotCommand, Answer, LibvirtComputingResource> {
  
  
      @Override
      public Answer execute(final RestoreVMSnapshotCommand cmd, final LibvirtComputingResource libvirtComputingResource) {
          String vmName = cmd.getVmName();
          List<VolumeObjectTO> listVolumeTo = cmd.getVolumeTOs();
          VirtualMachine.PowerState vmState = VirtualMachine.PowerState.PowerOn;
  
          Domain dm = null;
          try {
              final LibvirtUtilitiesHelper libvirtUtilitiesHelper = libvirtComputingResource.getLibvirtUtilitiesHelper();
              Connect conn = libvirtUtilitiesHelper.getConnection();
              dm = libvirtComputingResource.getDomain(conn, vmName);
  
              if (dm == null) {
                  return new RestoreVMSnapshotAnswer(cmd, false,
                          "Restore VM Snapshot Failed due to can not find vm: " + vmName);
              }
              String xmlDesc = dm.getXMLDesc(0);
  
              List<VMSnapshotTO> snapshots = cmd.getSnapshots();
              Map<Long, VMSnapshotTO> snapshotAndParents = cmd.getSnapshotAndParents();
              for (VMSnapshotTO snapshot: snapshots) {
                  VMSnapshotTO parent = snapshotAndParents.get(snapshot.getId());
                  String vmSnapshotXML = libvirtUtilitiesHelper.generateVMSnapshotXML(snapshot, parent, xmlDesc);
                  logger.debug("Restoring vm snapshot " + snapshot.getSnapshotName() + " on " + vmName + " with XML:\n " + vmSnapshotXML);
                  try {
                      int flags = 1; // VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE = 1
                      if (snapshot.getCurrent()) {
                          flags += 2; // VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT = 2
                      }
                      dm.snapshotCreateXML(vmSnapshotXML, flags);
                  } catch (LibvirtException e) {
                      logger.debug("Failed to restore vm snapshot " + snapshot.getSnapshotName() + " on " + vmName);
                      return new RestoreVMSnapshotAnswer(cmd, false, e.toString());
                  }
              }
  
              return new RestoreVMSnapshotAnswer(cmd, listVolumeTo, vmState);
          } catch (LibvirtException e) {
              String msg = " Restore snapshot failed due to " + e.toString();
              logger.warn(msg, e);
              return new RestoreVMSnapshotAnswer(cmd, false, msg);
          } finally {
              if (dm != null) {
                  try {
                      dm.free();
                  } catch (LibvirtException l) {
                      logger.trace("Ignoring libvirt error.", l);
                  };
              }
          }
      }
  }
  