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.Maps;
  import java.math.RoundingMode;
  import java.text.DecimalFormat;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import org.apache.bookkeeper.client.BookKeeper;
  import org.apache.bookkeeper.client.BookieInfoReader;
  import org.apache.bookkeeper.common.util.JsonUtil;
  import org.apache.bookkeeper.conf.ClientConfiguration;
  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.net.BookieId;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle Bookkeeper list bookie info related http request.
   *
   * <p>The GET method will get the disk usage of all bookies in this bookkeeper cluster.
   * Output would be like this:
   *  {
   *    "bookieAddress" : {free: xxx, total: xxx}",
   *    "bookieAddress" : {free: xxx, total: xxx},
   *    ...
   *    "clusterInfo" : {total_free: xxx, total: xxx}"
   *  }
   */
  public class ListBookieInfoService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(ListBookieInfoService.class);
  
      protected ServerConfiguration conf;
  
      public ListBookieInfoService(ServerConfiguration conf) {
          checkNotNull(conf);
          this.conf = conf;
      }
  
      String getReadable(long val) {
          String[] unit = {"", "KB", "MB", "GB", "TB" };
          int cnt = 0;
          double d = val;
          while (d >= 1000 && cnt < unit.length - 1) {
              d = d / 1000;
              cnt++;
          }
          DecimalFormat df = new DecimalFormat("#.###");
          df.setRoundingMode(RoundingMode.DOWN);
          return cnt > 0 ? "(" + df.format(d) + unit[cnt] + ")" : unit[cnt];
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
  
          if (HttpServer.Method.GET == request.getMethod()) {
              ClientConfiguration clientConf = new ClientConfiguration(conf);
              clientConf.setDiskWeightBasedPlacementEnabled(true);
              BookKeeper bk = new BookKeeper(clientConf);
  
              Map<BookieId, BookieInfoReader.BookieInfo> map = bk.getBookieInfo();
              if (map.size() == 0) {
                  bk.close();
                  response.setCode(HttpServer.StatusCode.NOT_FOUND);
                  response.setBody("Not found any Bookie info.");
                  return response;
              }
  
              /**
               * output:
               *  {
               *    "bookieAddress" : {free: xxx, total: xxx}",
               *    "bookieAddress" : {free: xxx, total: xxx},
               *    ...
               *    "clusterInfo" : {total_free: xxx, total: xxx}"
               *  }
               */
              LinkedHashMap<String, String> output = Maps.newLinkedHashMapWithExpectedSize(map.size());
              Long totalFree = 0L, total = 0L;
              for (Map.Entry<BookieId, BookieInfoReader.BookieInfo> infoEntry : map.entrySet()) {
                  BookieInfoReader.BookieInfo bInfo = infoEntry.getValue();
                  output.put(infoEntry.getKey().toString(),
                      ": {Free: " + bInfo.getFreeDiskSpace() + getReadable(bInfo.getFreeDiskSpace())
                      + ", Total: " + bInfo.getTotalDiskSpace() + getReadable(bInfo.getTotalDiskSpace()) + "},");
                  totalFree += bInfo.getFreeDiskSpace();
                  total += bInfo.getTotalDiskSpace();
              }
              output.put("ClusterInfo: ",
                  "{Free: " + totalFree + getReadable(totalFree)
                  + ", Total: " + total + getReadable(total) + "}");
  
              bk.close();
  
              String jsonResponse = JsonUtil.toJson(output);
              if (LOG.isDebugEnabled()) {
                  LOG.debug("output body:" + jsonResponse);
              }
              response.setBody(jsonResponse);
              response.setCode(HttpServer.StatusCode.OK);
              return response;
          } else {
              response.setCode(HttpServer.StatusCode.NOT_FOUND);
              response.setBody("Not found method. Should be GET method");
              return response;
          }
      }
  }
  