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Server functionality for HBase
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/**
 *
 * 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.zookeeper;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import java.util.Properties;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooKeeperMain;

/**
 * Tool for running ZookeeperMain from HBase by  reading a ZooKeeper server
 * from HBase XML configuration.
 */
public class ZooKeeperMainServer {
  private static final String SERVER_ARG = "-server";

  public String parse(final Configuration c) {
    // Note that we do not simply grab the property
    // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
    // user may be using a zoo.cfg file.
    Properties zkProps = ZKConfig.makeZKProps(c);
    String clientPort = null;
    List hosts = new ArrayList();
    for (Entry entry: zkProps.entrySet()) {
      String key = entry.getKey().toString().trim();
      String value = entry.getValue().toString().trim();
      if (key.startsWith("server.")) {
        String[] parts = value.split(":");
        hosts.add(parts[0]);
      } else if (key.endsWith("clientPort")) {
        clientPort = value;
      }
    }
    if (hosts.isEmpty() || clientPort == null) return null;
    StringBuilder host = new StringBuilder();
    for (int i = 0; i < hosts.size(); i++) {
      if (i > 0)  host.append("," + hosts.get(i));
      else host.append(hosts.get(i));
      host.append(":");
      host.append(clientPort);
    }
    return host.toString();
  }

  /**
   * ZooKeeper 3.4.6 broke being able to pass commands on command line.
   * See ZOOKEEPER-1897.  This class is a hack to restore this faclity.
   */
  private static class HACK_UNTIL_ZOOKEEPER_1897_ZooKeeperMain extends ZooKeeperMain {
    public HACK_UNTIL_ZOOKEEPER_1897_ZooKeeperMain(String[] args)
    throws IOException, InterruptedException {
      super(args);
    }

    /**
     * Run the command-line args passed.  Calls System.exit when done.
     * @throws KeeperException
     * @throws IOException
     * @throws InterruptedException
     */
    void runCmdLine() throws KeeperException, IOException, InterruptedException {
      processCmd(this.cl);
      System.exit(0);
    }
  }

  /**
   * @param args
   * @return True if argument strings have a '-server' in them.
   */
  private static boolean hasServer(final String args[]) {
    return args.length > 0 && args[0].equals(SERVER_ARG);
  }

  /**
   * @param args
   * @return True if command-line arguments were passed.
   */
  private static boolean hasCommandLineArguments(final String args[]) {
    if (hasServer(args)) {
      if (args.length < 2) throw new IllegalStateException("-server param but no value");
      return args.length > 2;
    }
    return args.length > 0;
  }

  /**
   * Run the tool.
   * @param args Command line arguments. First arg is path to zookeepers file.
   */
  public static void main(String args[]) throws Exception {
    String [] newArgs = args;
    if (!hasServer(args)) {
      // Add the zk ensemble from configuration if none passed on command-line.
      Configuration conf = HBaseConfiguration.create();
      String hostport = new ZooKeeperMainServer().parse(conf);
      if (hostport != null && hostport.length() > 0) {
        newArgs = new String[args.length + 2];
        System.arraycopy(args, 0, newArgs, 2, args.length);
        newArgs[0] = "-server";
        newArgs[1] = hostport;
      }
    }
    // If command-line arguments, run our hack so they are executed.
    if (hasCommandLineArguments(args)) {
      HACK_UNTIL_ZOOKEEPER_1897_ZooKeeperMain zkm =
        new HACK_UNTIL_ZOOKEEPER_1897_ZooKeeperMain(newArgs);
      zkm.runCmdLine();
    } else {
      ZooKeeperMain.main(newArgs);
    }
  }
}