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 org.apache.bookkeeper.tools.cli.commands.bookies;
  
  import static org.apache.bookkeeper.meta.MetadataDrivers.runFunctionWithLedgerManagerFactory;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.util.concurrent.UncheckedExecutionException;
  import java.util.Iterator;
  import lombok.Data;
  import org.apache.bookkeeper.client.BKException;
  import org.apache.bookkeeper.client.BookKeeperAdmin;
  import org.apache.bookkeeper.common.util.JsonUtil;
  import org.apache.bookkeeper.conf.ClientConfiguration;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.meta.LedgerUnderreplicationManager;
  import org.apache.bookkeeper.meta.UnderreplicatedLedger;
  import org.apache.bookkeeper.net.BookieId;
  import org.apache.bookkeeper.tools.cli.helpers.BookieCommand;
  import org.apache.bookkeeper.tools.framework.CliFlags;
  import org.apache.bookkeeper.tools.framework.CliSpec;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A bookie command to retrieve bookies cluster info.
   */
  public class ClusterInfoCommand extends BookieCommand<CliFlags> {
  
      private static final String NAME = "cluster-info";
      private static final String DESC = "Exposes the current info about the cluster of bookies";
      private static final Logger LOG = LoggerFactory.getLogger(ClusterInfoCommand.class);
      private ClusterInfo info;
  
      public ClusterInfoCommand() {
          super(CliSpec.newBuilder()
                  .withName(NAME)
                  .withFlags(new CliFlags())
                  .withDescription(DESC)
                  .build());
      }
  
      @VisibleForTesting
      public static ClusterInfoCommand newClusterInfoCommand() {
          return new ClusterInfoCommand();
      }
  
      /**
       * POJO definition for the cluster info response.
       */
      @Data
      public static class ClusterInfo {
          private boolean auditorElected;
          private String auditorId;
          private boolean clusterUnderReplicated;
          private boolean ledgerReplicationEnabled;
          private int totalBookiesCount;
          private int writableBookiesCount;
          private int readonlyBookiesCount;
          private int unavailableBookiesCount;
      }
  
      @Override
      public boolean apply(ServerConfiguration conf, CliFlags cmdFlags) {
  
          ClientConfiguration clientConfiguration = new ClientConfiguration(conf);
          try (BookKeeperAdmin admin = new BookKeeperAdmin(clientConfiguration)) {
              LOG.info("Starting fill cluster info.");
              info = new ClusterInfo();
              fillUReplicatedInfo(info, conf);
              fillAuditorInfo(info, admin);
              fillBookiesInfo(info, admin);
  
              LOG.info("--------- Cluster Info ---------");
              LOG.info("{}", JsonUtil.toJson(info));
          } catch (Exception e) {
              e.printStackTrace();
          }
  
          return true;
      }
  
      private void fillBookiesInfo(ClusterInfo info, BookKeeperAdmin bka) throws BKException {
          int totalBookiesCount = bka.getAllBookies().size();
          int writableBookiesCount = bka.getAvailableBookies().size();
          int readonlyBookiesCount = bka.getReadOnlyBookies().size();
          int unavailableBookiesCount = totalBookiesCount - writableBookiesCount - readonlyBookiesCount;
  
          info.setTotalBookiesCount(totalBookiesCount);
          info.setWritableBookiesCount(writableBookiesCount);
          info.setReadonlyBookiesCount(readonlyBookiesCount);
          info.setUnavailableBookiesCount(unavailableBookiesCount);
      }
  
      private void fillAuditorInfo(ClusterInfo info, BookKeeperAdmin bka) {
          try {
              BookieId currentAuditor = bka.getCurrentAuditor();
              info.setAuditorElected(currentAuditor != null);
              info.setAuditorId(currentAuditor == null ? "" : currentAuditor.getId());
          } catch (Exception e) {
              LOG.error("Could not get Auditor info", e);
              info.setAuditorElected(false);
              info.setAuditorId("");
          }
      }
  
      private void fillUReplicatedInfo(ClusterInfo info, ServerConfiguration conf) throws Exception {
          runFunctionWithLedgerManagerFactory(conf, mFactory -> {
              try (LedgerUnderreplicationManager underreplicationManager =
                           mFactory.newLedgerUnderreplicationManager()) {
                  Iterator<UnderreplicatedLedger> iter = underreplicationManager.listLedgersToRereplicate(null);
  
                  info.setClusterUnderReplicated(iter.hasNext());
                  info.setLedgerReplicationEnabled(underreplicationManager.isLedgerReplicationEnabled());
              } catch (Exception e) {
                  throw new UncheckedExecutionException(e);
              }
              return null;
          });
      }
  
      @VisibleForTesting
      public ClusterInfo info() {
          return info;
      }
  }
  