content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.cli.fsadmin.report;
  
  import alluxio.client.meta.MetaMasterClient;
  import alluxio.grpc.BuildVersion;
  import alluxio.grpc.NetAddress;
  import alluxio.grpc.ProxyStatus;
  
  import java.io.IOException;
  import java.io.PrintStream;
  import java.time.Instant;
  import java.time.ZoneId;
  import java.time.format.DateTimeFormatter;
  import java.time.format.FormatStyle;
  import java.util.List;
  import java.util.Locale;
  
  /**
   * Prints information about proxy instances in the cluster.
   */
  public class ProxyCommand {
    private final MetaMasterClient mMetaMasterClient;
    private final PrintStream mPrintStream;
  
    public static final DateTimeFormatter DATETIME_FORMAT =
            DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT).ofPattern("yyyyMMdd-HHmmss")
                    .withLocale(Locale.getDefault()).withZone(ZoneId.systemDefault());
  
    /**
     * Creates a new instance of {@link ProxyCommand}.
     *
     * @param metaMasterClient the client to talk to the master with
     * @param printStream the stream to print to
     */
    public ProxyCommand(MetaMasterClient metaMasterClient, PrintStream printStream) {
      mMetaMasterClient = metaMasterClient;
      mPrintStream = printStream;
    }
  
    /**
     * Runs a proxy report command.
     *
     * @return 0 on success, 1 otherwise
     */
    public int run() throws IOException {
      String[] header = new String[]{"Address", "State", "Start Time", "Last Heartbeat Time",
          "Version", "Revision"};
  
      try {
        List<ProxyStatus> allProxyStatus = mMetaMasterClient.listProxyStatus();
        int liveCount = 0;
        int lostCount = 0;
        int maxAddressLength = 24;
        for (ProxyStatus proxyStatus : allProxyStatus) {
          String state = proxyStatus.getState();
          if (state.equals("ACTIVE")) {
            liveCount++;
          } else if (state.equals("LOST")) {
            lostCount++;
          }
          NetAddress address = proxyStatus.getAddress();
          String addressStr = address.getHost() + ":" + address.getRpcPort();
          if (maxAddressLength < addressStr.length()) {
            maxAddressLength = addressStr.length();
          }
        }
        mPrintStream.printf("%s Proxy instances in the cluster, %s serving and %s lost%n%n",
                liveCount + lostCount, liveCount, lostCount);
  
        String format = "%-" + maxAddressLength + "s %-8s %-16s %-20s %-32s %-8s%n";
        mPrintStream.printf(format, header);
        for (ProxyStatus proxyStatus : allProxyStatus) {
          NetAddress address = proxyStatus.getAddress();
          BuildVersion version = proxyStatus.getVersion();
          mPrintStream.printf(format,
                  address.getHost() + ":" + address.getRpcPort(),
                  proxyStatus.getState(),
                  DATETIME_FORMAT.format(Instant.ofEpochMilli(proxyStatus.getStartTime())),
                  DATETIME_FORMAT.format(Instant.ofEpochMilli(proxyStatus.getLastHeartbeatTime())),
                  version.getVersion(), version.getRevision());
        }
        return 0;
      } catch (Exception e) {
        e.printStackTrace();
        return 1;
      }
    }
  }
  