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.alibaba.jstorm.callback.impl;
  
  import com.alibaba.jstorm.blobstore.BlobStore;
  import com.alibaba.jstorm.blobstore.BlobStoreUtils;
  import com.alibaba.jstorm.callback.BaseCallback;
  import com.alibaba.jstorm.cluster.StormBase;
  import com.alibaba.jstorm.cluster.StormClusterState;
  import com.alibaba.jstorm.cluster.StormConfig;
  import com.alibaba.jstorm.cluster.StormStatus;
  import com.alibaba.jstorm.daemon.nimbus.NimbusData;
  import com.alibaba.jstorm.daemon.nimbus.StatusType;
  import com.alibaba.jstorm.task.upgrade.GrayUpgradeConfig;
  import com.google.common.collect.Sets;
  import java.util.Set;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * @author wange
   * @since 24/02/2017
   */
  public class RollbackTransitionCallback extends BaseCallback {
      private final Logger LOG = LoggerFactory.getLogger(getClass());
  
      private NimbusData data;
      private String topologyId;
  
      public RollbackTransitionCallback(NimbusData data, String topologyId) {
          this.data = data;
          this.topologyId = topologyId;
      }
  
      @Override
      public <T> Object execute(T... args) {
          LOG.warn("Some workers are dead during upgrade, upgrade fails, rolling back...");
          try {
              StormBase stormBase = data.getStormClusterState().storm_base(topologyId, null);
              if (stormBase.getStatus().getStatusType() == StatusType.rollback) {
                  LOG.warn("Topology {} is already rolling back, skip.", topologyId);
                  return null;
              }
  
              StormClusterState stormClusterState = data.getStormClusterState();
              BlobStore blobStore = data.getBlobStore();
              GrayUpgradeConfig upgradeConfig = (GrayUpgradeConfig) stormClusterState.get_gray_upgrade_conf(topologyId);
              if (upgradeConfig != null) {
                  String codeKeyBak = StormConfig.master_stormcode_bak_key(topologyId);
                  LOG.info("Restoring storm code with key:{}", codeKeyBak);
                  BlobStoreUtils.updateBlob(blobStore, StormConfig.master_stormcode_key(topologyId),
                          blobStore.getBlob(codeKeyBak));
  
                  String stormJarKeyBak = StormConfig.master_stormjar_bak_key(topologyId);
                  LOG.info("Restoring storm jar with key:{}", stormJarKeyBak);
                  BlobStoreUtils.updateBlob(blobStore, StormConfig.master_stormjar_key(topologyId),
                          blobStore.getBlob(stormJarKeyBak));
  
                  upgradeConfig.setRollback(true);
                  stormClusterState.set_gray_upgrade_conf(topologyId, upgradeConfig);
  
                  Set<String> upgradedWorkers = Sets.newHashSet(stormClusterState.get_upgraded_workers(topologyId));
                  if (upgradedWorkers.size() > 0) {
                      LOG.info("Setting rollback workers:{}", upgradedWorkers);
                      for (String upgradedWorker : upgradedWorkers) {
                          stormClusterState.add_upgrading_worker(topologyId, upgradedWorker);
                      }
                  }
              } else {
                  LOG.warn("Cannot get upgrade config, aborting...");
              }
  
              return new StormStatus(StatusType.rollback);
          } catch (Exception ex) {
              LOG.error("Failed to call RollbackTransitionCallback!", ex);
          }
          return null;
      }
  }
  