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 lombok.AllArgsConstructor;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  import org.apache.bookkeeper.bookie.Bookie;
  import org.apache.bookkeeper.bookie.StateManager;
  import org.apache.bookkeeper.common.util.JsonUtil;
  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;
  
  /**
   * HttpEndpointService that handles readOnly state related http requests.
   * The GET method will get the current readOnly state of the bookie.
   * The PUT method will change the current readOnly state of the bookie if the desired state is
   * different from the current. The request body could be {"readOnly":true/false}. The current
   * or the updated state will be included in the response.
   */
  public class BookieStateReadOnlyService implements HttpEndpointService {
      private final Bookie bookie;
  
      public BookieStateReadOnlyService(Bookie bookie) {
          this.bookie = checkNotNull(bookie);
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
          StateManager stateManager = this.bookie.getStateManager();
  
          if (HttpServer.Method.PUT.equals(request.getMethod())) {
              ReadOnlyState inState = JsonUtil.fromJson(request.getBody(), ReadOnlyState.class);
              if (stateManager.isReadOnly() && !inState.isReadOnly()) {
                  if (stateManager.isForceReadOnly()) {
                      response.setCode(HttpServer.StatusCode.BAD_REQUEST);
                      response.setBody("Bookie is in forceReadOnly mode, cannot transit to writable mode");
                      return response;
                  }
                  stateManager.transitionToWritableMode(true).get();
              } else if (!stateManager.isReadOnly() && inState.isReadOnly()) {
                  if (!stateManager.isReadOnlyModeEnabled()) {
                      response.setCode(HttpServer.StatusCode.BAD_REQUEST);
                      response.setBody("Bookie is disabled ReadOnly mode, cannot transit to readOnly mode");
                      return response;
                  }
                  stateManager.transitionToReadOnlyMode(true).get();
              }
          } else if (!HttpServer.Method.GET.equals(request.getMethod())) {
              response.setCode(HttpServer.StatusCode.NOT_FOUND);
              response.setBody("Unsupported method. Should be GET or PUT method");
              return response;
          }
  
          ReadOnlyState outState = new ReadOnlyState(stateManager.isReadOnly());
          response.setBody(JsonUtil.toJson(outState));
          response.setCode(HttpServer.StatusCode.OK);
  
          return response;
      }
  
      /**
       * The object represent the readOnly state.
       */
      @AllArgsConstructor
      @NoArgsConstructor
      @Data
      public static class ReadOnlyState {
          private boolean readOnly;
      }
  }
  