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.server.http.service;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import com.google.common.collect.Lists;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Predicate;
  import org.apache.bookkeeper.common.util.JsonUtil;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.http.HttpServer;
  import org.apache.bookkeeper.http.service.HttpEndpointService;
  import org.apache.bookkeeper.http.service.HttpServiceRequest;
  import org.apache.bookkeeper.http.service.HttpServiceResponse;
  import org.apache.bookkeeper.meta.LedgerManagerFactory;
  import org.apache.bookkeeper.meta.LedgerUnderreplicationManager;
  import org.apache.bookkeeper.meta.UnderreplicatedLedger;
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle Bookkeeper list under replicated ledger related http request.
   *
   * <p>The GET method will list all ledger_ids of under replicated ledger.
   * User can filer wanted ledger by set parameter "missingreplica" and "excludingmissingreplica"
   */
  public class ListUnderReplicatedLedgerService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(ListUnderReplicatedLedgerService.class);
  
      protected ServerConfiguration conf;
      private final LedgerManagerFactory ledgerManagerFactory;
  
      public ListUnderReplicatedLedgerService(ServerConfiguration conf, LedgerManagerFactory ledgerManagerFactory) {
          checkNotNull(conf);
          this.conf = conf;
          this.ledgerManagerFactory = ledgerManagerFactory;
      }
  
      /*
       * Print the node which holds the auditor lock.
       */
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
          // parameter as this: ?missingreplica=<bookie_address>&excludingmissingreplica=<bookid_address>
          Map<String, String> params = request.getParams();
  
          if (HttpServer.Method.GET == request.getMethod()) {
              final String includingBookieId;
              final String excludingBookieId;
              boolean printMissingReplica = false;
  
              if (params != null && params.containsKey("missingreplica")) {
                  includingBookieId = params.get("missingreplica");
              } else {
                  includingBookieId = null;
              }
              if (params != null && params.containsKey("excludingmissingreplica")) {
                  excludingBookieId = params.get("excludingmissingreplica");
              } else {
                  excludingBookieId = null;
              }
              if (params != null && params.containsKey("printmissingreplica")) {
                  printMissingReplica = true;
              }
              Predicate<List<String>> predicate = null;
              if (!StringUtils.isBlank(includingBookieId) && !StringUtils.isBlank(excludingBookieId)) {
                  predicate = replicasList -> (replicasList.contains(includingBookieId)
                    && !replicasList.contains(excludingBookieId));
              } else if (!StringUtils.isBlank(includingBookieId)) {
                  predicate = replicasList -> replicasList.contains(includingBookieId);
              } else if (!StringUtils.isBlank(excludingBookieId)) {
                  predicate = replicasList -> !replicasList.contains(excludingBookieId);
              }
  
              try {
                  boolean hasURLedgers = false;
                  List<Long> outputLedgers = null;
                  Map<Long, List<String>> outputLedgersWithMissingReplica = null;
                  LedgerUnderreplicationManager underreplicationManager =
                      ledgerManagerFactory.newLedgerUnderreplicationManager();
                  Iterator<UnderreplicatedLedger> iter = underreplicationManager.listLedgersToRereplicate(predicate);
  
                  hasURLedgers = iter.hasNext();
                  if (hasURLedgers) {
                      if (printMissingReplica) {
                          outputLedgersWithMissingReplica = new LinkedHashMap<Long, List<String>>();
                      } else {
                          outputLedgers = Lists.newArrayList();
                      }
                  }
                  while (iter.hasNext()) {
                      if (printMissingReplica) {
                          UnderreplicatedLedger underreplicatedLedger = iter.next();
                          outputLedgersWithMissingReplica.put(underreplicatedLedger.getLedgerId(),
                                  underreplicatedLedger.getReplicaList());
                      } else {
                          outputLedgers.add(iter.next().getLedgerId());
                      }
                  }
                  if (!hasURLedgers) {
                      response.setCode(HttpServer.StatusCode.NOT_FOUND);
                      response.setBody("No under replicated ledgers found");
                      return response;
                  } else {
                      response.setCode(HttpServer.StatusCode.OK);
                      String jsonResponse = JsonUtil
                              .toJson(printMissingReplica ? outputLedgersWithMissingReplica : outputLedgers);
                      if (LOG.isDebugEnabled()) {
                          LOG.debug("output body: " + jsonResponse);
                      }
                      response.setBody(jsonResponse);
                      return response;
                  }
              } catch (Exception e) {
                  LOG.error("Exception occurred while listing under replicated ledgers", e);
                  response.setCode(HttpServer.StatusCode.NOT_FOUND);
                  response.setBody("Exception when get." + e.getMessage());
                  return response;
              }
          } else {
              response.setCode(HttpServer.StatusCode.NOT_FOUND);
              response.setBody("Not found method. Should be GET method");
              return response;
          }
      }
  }
  