/*
    *
    * 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 org.apache.hadoop.hbase.replication.master;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.Abortable;
  import org.apache.hadoop.hbase.HBaseConfiguration;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceStability;
  import org.apache.hadoop.hbase.replication.ReplicationSerDeHelper;
  import org.apache.hadoop.hbase.exceptions.DeserializationException;
  import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
  import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
  import org.apache.hadoop.hbase.replication.ReplicationStateZKBase;
  import org.apache.hadoop.hbase.zookeeper.ZKUtil;
  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
  import org.apache.zookeeper.KeeperException;
  
  import java.io.IOException;
  import java.util.List;
  
  /**
   * This class is used to upgrade TableCFs from HBase 1.0, 1.1, 1.2, 1.3 to HBase 1.4 or 2.x.
   * It will be removed in HBase 3.x. See HBASE-11393
   */
  @InterfaceAudience.Private
  @InterfaceStability.Unstable
  public class TableCFsUpdater extends ReplicationStateZKBase {
  
    private static final Log LOG = LogFactory.getLog(TableCFsUpdater.class);
  
    public TableCFsUpdater(ZooKeeperWatcher zookeeper,
                           Configuration conf, Abortable abortable) {
      super(zookeeper, conf, abortable);
    }
  
    public void update() {
      List<String> znodes = null;
      try {
        znodes = ZKUtil.listChildrenNoWatch(this.zookeeper, this.peersZNode);
      } catch (KeeperException e) {
        LOG.error("Failed to get peers znode", e);
      }
      if (znodes != null) {
        for (String peerId : znodes) {
          if (!update(peerId)) {
            LOG.error("upgrade tableCFs failed for peerId=" + peerId);
          }
        }
      }
    }
  
    public boolean update(String peerId) {
      String tableCFsNode = getTableCFsNode(peerId);
      try {
        if (ZKUtil.checkExists(zookeeper, tableCFsNode) != -1) {
          String peerNode = getPeerNode(peerId);
          ReplicationPeerConfig rpc = getReplicationPeerConig(peerNode);
          // We only need to copy data from tableCFs node to rpc Node the first time hmaster start.
          if (rpc.getTableCFsMap() == null || rpc.getTableCFsMap().size() == 0) {
            // we copy TableCFs node into PeerNode
            LOG.info("copy tableCFs into peerNode:" + peerId);
            ZooKeeperProtos.TableCF[] tableCFs =
                    ReplicationSerDeHelper.parseTableCFs(
                            ZKUtil.getData(this.zookeeper, tableCFsNode));
            rpc.setTableCFsMap(ReplicationSerDeHelper.convert2Map(tableCFs));
            ZKUtil.setData(this.zookeeper, peerNode,
                    ReplicationSerDeHelper.toByteArray(rpc));
          } else {
            LOG.info("No tableCFs in peerNode:" + peerId);
          }
        }
      } catch (KeeperException e) {
        LOG.warn("NOTICE!! Update peerId failed, peerId=" + peerId, e);
        return false;
      } catch (InterruptedException e) {
        LOG.warn("NOTICE!! Update peerId failed, peerId=" + peerId, e);
        return false;
      } catch (IOException e) {
        LOG.warn("NOTICE!! Update peerId failed, peerId=" + peerId, e);
        return false;
     }
     return true;
   }
 
   private ReplicationPeerConfig getReplicationPeerConig(String peerNode)
           throws KeeperException, InterruptedException {
     byte[] data = null;
     data = ZKUtil.getData(this.zookeeper, peerNode);
     if (data == null) {
       LOG.error("Could not get configuration for " +
               "peer because it doesn't exist. peer=" + peerNode);
       return null;
     }
     try {
       return ReplicationSerDeHelper.parsePeerFrom(data);
     } catch (DeserializationException e) {
       LOG.warn("Failed to parse cluster key from peer=" + peerNode);
       return null;
     }
   }
 
   private static void printUsageAndExit() {
     System.err.printf("Usage: bin/hbase org.apache.hadoop.hbase.replication.master.TableCFsUpdater [options]");
     System.err.println(" where [options] are:");
     System.err.println("  -h|-help    Show this help and exit.");
     System.err.println("  update      Copy table-cfs to replication peer config");
     System.err.println();
     System.exit(1);
   }
 
   public static void main(String[] args) throws Exception {
     if (args.length != 1) {
       printUsageAndExit();
     }
     if (args[0].equals("-help") || args[0].equals("-h")) {
       printUsageAndExit();
     } else if (args[0].equals("update")) {
       Configuration conf = HBaseConfiguration.create();
       ZooKeeperWatcher zkw = new ZooKeeperWatcher(conf, "TableCFsUpdater", null);
       try {
         TableCFsUpdater tableCFsUpdater = new TableCFsUpdater(zkw, conf, null);
         tableCFsUpdater.update();
       } finally {
         zkw.close();
       }
     } else {
       printUsageAndExit();
     }
   }
 }