content: /*
   * Copyright 1999-2020 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.nacos.core.controller.v3;
  
  import com.alibaba.nacos.api.annotation.NacosApi;
  import com.alibaba.nacos.api.model.response.ServerLoaderMetrics;
  import com.alibaba.nacos.api.model.v2.ErrorCode;
  import com.alibaba.nacos.api.model.v2.Result;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.core.remote.Connection;
  import com.alibaba.nacos.core.service.NacosServerLoaderService;
  import com.alibaba.nacos.core.utils.WebUtils;
  import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
  import com.alibaba.nacos.plugin.auth.constant.ApiType;
  import jakarta.servlet.http.HttpServletRequest;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  
  import java.util.Map;
  
  import static com.alibaba.nacos.core.utils.Commons.NACOS_ADMIN_CORE_CONTEXT_V3;
  
  /**
   * controller to control server loader v3.
   *
   * @author yunye
   * @since 3.0.0
   */
  @NacosApi
  @RestController
  @RequestMapping(NACOS_ADMIN_CORE_CONTEXT_V3 + "/loader")
  @SuppressWarnings("PMD.MethodTooLongRule")
  public class ServerLoaderControllerV3 {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(ServerLoaderControllerV3.class);
      
      private final NacosServerLoaderService serverLoaderService;
      
      public ServerLoaderControllerV3(NacosServerLoaderService serverLoaderService) {
          this.serverLoaderService = serverLoaderService;
      }
      
      /**
       * Get current clients.
       *
       * @return state json.
       */
      @GetMapping("/current")
      @Secured(resource = NACOS_ADMIN_CORE_CONTEXT_V3 + "/loader", action = ActionTypes.READ, apiType = ApiType.ADMIN_API)
      public Result<Map<String, Connection>> currentClients() {
          return Result.success(serverLoaderService.getAllClients());
      }
      
      /**
       * Rebalance the number of sdk connections on the current server.
       *
       * @return state json.
       */
      @Secured(resource = NACOS_ADMIN_CORE_CONTEXT_V3
              + "/loader", action = ActionTypes.WRITE, apiType = ApiType.ADMIN_API)
      @PostMapping("/reloadCurrent")
      public Result<String> reloadCount(@RequestParam Integer count,
              @RequestParam(value = "redirectAddress", required = false) String redirectAddress) {
          serverLoaderService.reloadCount(count, redirectAddress);
          return Result.success();
      }
      
      /**
       * According to the total number of sdk connections of all nodes in the nacos cluster, intelligently balance the
       * number of sdk connections of each node in the nacos cluster.
       *
       * @return state json.
       */
      @PostMapping("/smartReloadCluster")
      @Secured(resource = NACOS_ADMIN_CORE_CONTEXT_V3
              + "/loader", action = ActionTypes.WRITE, apiType = ApiType.ADMIN_API)
      public Result<String> smartReload(HttpServletRequest request,
              @RequestParam(value = "loaderFactor", defaultValue = "0.1f") String loaderFactorStr) {
          LOGGER.info("Smart reload request receive,requestIp={}", WebUtils.getRemoteIp(request));
          float loaderFactor = Float.parseFloat(loaderFactorStr);
          if (!serverLoaderService.smartReload(loaderFactor)) {
              return Result.failure(ErrorCode.SERVER_ERROR, "Smart reload failed, please try again later.");
          }
          return Result.success();
      }
      
      /**
       * Send a ConnectResetRequest to this connection according to the sdk connection ID.
       *
       * @return state json.
       */
      @PostMapping("/reloadClient")
      @Secured(resource = NACOS_ADMIN_CORE_CONTEXT_V3
              + "/loader", action = ActionTypes.WRITE, apiType = ApiType.ADMIN_API)
      public Result<String> reloadSingle(@RequestParam String connectionId,
              @RequestParam(value = "redirectAddress", required = false) String redirectAddress) {
          serverLoaderService.reloadClient(connectionId, redirectAddress);
          return Result.success();
      }
      
      /**
       * Get current clients.
       *
       * @return state json.
       */
      @GetMapping("/cluster")
      @Secured(resource = NACOS_ADMIN_CORE_CONTEXT_V3 + "/loader", action = ActionTypes.READ, apiType = ApiType.ADMIN_API)
      public Result<ServerLoaderMetrics> loaderMetrics() {
          return Result.success(serverLoaderService.getServerLoaderMetrics());
      }
  }
  