content: /*
   * Copyright 1999-2019 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.command.handler;
  
  import com.alibaba.csp.sentinel.command.CommandHandler;
  import com.alibaba.csp.sentinel.command.CommandHandlerProvider;
  import com.alibaba.csp.sentinel.command.CommandRequest;
  import com.alibaba.csp.sentinel.command.CommandResponse;
  import com.alibaba.csp.sentinel.command.annotation.CommandMapping;
  import com.alibaba.fastjson.JSONArray;
  import com.alibaba.fastjson.JSONObject;
  
  import java.util.Map;
  
  /**
   * <p>
   * List all available command handlers by request: </br>
   * {@code curl http://ip:commandPort/api}
   * </p>
   *
   * @author houyi
   * @since 1.5.0
   */
  @CommandMapping(name = "api", desc = "get all available command handlers")
  public class ApiCommandHandler implements CommandHandler<String> {
  
      @Override
      public CommandResponse<String> handle(CommandRequest request) {
          Map<String, CommandHandler> handlers = CommandHandlerProvider.getInstance().namedHandlers();
          JSONArray array = new JSONArray();
          if (handlers.isEmpty()) {
              return CommandResponse.ofSuccess(array.toJSONString());
          }
          for (CommandHandler handler : handlers.values()) {
              CommandMapping commandMapping = handler.getClass().getAnnotation(CommandMapping.class);
              if (commandMapping == null) {
                  continue;
              }
              String api = commandMapping.name();
              String desc = commandMapping.desc();
              JSONObject obj = new JSONObject();
              obj.put("url", "/" + api);
              obj.put("desc", desc);
              array.add(obj);
          }
          return CommandResponse.ofSuccess(array.toJSONString());
      }
  
  }
  