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 static org.apache.bookkeeper.bookie.BookieShell.listFilesAndSort;
  
  import com.google.common.collect.Maps;
  import java.io.File;
  import java.util.List;
  import java.util.Map;
  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.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle Bookkeeper list disk files related http request.
   *
   * <p>The GET method will list all bookie files of type journal|entrylog|index in this bookie.
   * The output would be like this:
   *  {
   *    "journal files" : "filename1 \t ...",
   *    "entrylog files" : "filename1 \t ...",
   *    "index files" : "filename1 \t ..."
   *  }
   */
  public class ListDiskFilesService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(ListDiskFilesService.class);
  
      protected ServerConfiguration conf;
  
      public ListDiskFilesService(ServerConfiguration conf) {
          checkNotNull(conf);
          this.conf = conf;
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
          Map<String, String> params = request.getParams();
  
          if (HttpServer.Method.GET == request.getMethod()) {
              /**
               * output:
               *  {
               *    "journal files" : "filename \t ...",
               *    "entrylog files" : "filename \t ...",
               *    "index files" : "filename \t ..."
               *  }
               */
              Map<String, String> output = Maps.newHashMap();
  
              boolean journal = params != null
                  && params.containsKey("file_type")
                  && params.get("file_type").equals("journal");
              boolean entrylog = params != null
                  && params.containsKey("file_type")
                  && params.get("file_type").equals("entrylog");
              boolean index = params != null
                  && params.containsKey("file_type")
                  && params.get("file_type").equals("index");
              boolean all = false;
  
              if (!journal && !entrylog && !index && !all) {
                  all = true;
              }
  
              if (all || journal) {
                  File[] journalDirs = conf.getJournalDirs();
                  List<File> journalFiles = listFilesAndSort(journalDirs, "txn");
                  StringBuilder files = new StringBuilder();
                  for (File journalFile : journalFiles) {
                      files.append(journalFile.getName()).append("\t");
                  }
                  output.put("journal files", files.toString());
              }
  
              if (all || entrylog) {
                  File[] ledgerDirs = conf.getLedgerDirs();
                  List<File> ledgerFiles = listFilesAndSort(ledgerDirs, "log");
                  StringBuilder files = new StringBuilder();
                  for (File ledgerFile : ledgerFiles) {
                      files.append(ledgerFile.getName()).append("\t");
                  }
                  output.put("entrylog files", files.toString());
              }
  
              if (all || index) {
                  File[] indexDirs = (conf.getIndexDirs() == null) ? conf.getLedgerDirs() : conf.getIndexDirs();
                  List<File> indexFiles = listFilesAndSort(indexDirs, "idx");
                  StringBuilder files = new StringBuilder();
                  for (File indexFile : indexFiles) {
                      files.append(indexFile.getName()).append("\t");
                  }
                  output.put("index files", files.toString());
              }
  
              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;
          }
      }
  }
  