content: /*
   * Copyright 1999-2018 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.dashboard.controller.cluster;
  
  import java.util.List;
  import java.util.Optional;
  import java.util.concurrent.ExecutionException;
  
  import com.alibaba.csp.sentinel.cluster.ClusterStateManager;
  import com.alibaba.csp.sentinel.dashboard.client.CommandNotFoundException;
  import com.alibaba.csp.sentinel.dashboard.discovery.AppManagement;
  import com.alibaba.csp.sentinel.util.StringUtil;
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.JSONObject;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.SentinelVersion;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.request.ClusterClientModifyRequest;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.request.ClusterModifyRequest;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.request.ClusterServerModifyRequest;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.state.AppClusterClientStateWrapVO;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.state.AppClusterServerStateWrapVO;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.state.ClusterUniversalStatePairVO;
  import com.alibaba.csp.sentinel.dashboard.domain.cluster.state.ClusterUniversalStateVO;
  import com.alibaba.csp.sentinel.dashboard.service.ClusterConfigService;
  import com.alibaba.csp.sentinel.dashboard.util.ClusterEntityUtils;
  import com.alibaba.csp.sentinel.dashboard.util.VersionUtils;
  import com.alibaba.csp.sentinel.dashboard.domain.Result;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestBody;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  @RestController
  @RequestMapping(value = "/cluster")
  public class ClusterConfigController {
  
      private final Logger logger = LoggerFactory.getLogger(ClusterConfigController.class);
  
      private final SentinelVersion version140 = new SentinelVersion().setMajorVersion(1).setMinorVersion(4);
  
      @Autowired
      private AppManagement appManagement;
  
      @Autowired
      private ClusterConfigService clusterConfigService;
  
      @PostMapping("/config/modify_single")
      public Result<Boolean> apiModifyClusterConfig(@RequestBody String payload) {
          if (StringUtil.isBlank(payload)) {
              return Result.ofFail(-1, "empty request body");
          }
          try {
              JSONObject body = JSON.parseObject(payload);
              if (body.containsKey(KEY_MODE)) {
                  int mode = body.getInteger(KEY_MODE);
                  switch (mode) {
                      case ClusterStateManager.CLUSTER_CLIENT:
                          ClusterClientModifyRequest data = JSON.parseObject(payload, ClusterClientModifyRequest.class);
                          Result<Boolean> res = checkValidRequest(data);
                          if (res != null) {
                              return res;
                          }
                          clusterConfigService.modifyClusterClientConfig(data).get();
                          return Result.ofSuccess(true);
                      case ClusterStateManager.CLUSTER_SERVER:
                          ClusterServerModifyRequest d = JSON.parseObject(payload, ClusterServerModifyRequest.class);
                          Result<Boolean> r = checkValidRequest(d);
                          if (r != null) {
                              return r;
                          }
                          // TODO: bad design here, should refactor!
                          clusterConfigService.modifyClusterServerConfig(d).get();
                          return Result.ofSuccess(true);
                      default:
                          return Result.ofFail(-1, "invalid mode");
                  }
              }
              return Result.ofFail(-1, "invalid parameter");
          } catch (ExecutionException ex) {
              logger.error("Error when modifying cluster config", ex.getCause());
              return errorResponse(ex);
          } catch (Throwable ex) {
              logger.error("Error when modifying cluster config", ex);
              return Result.ofFail(-1, ex.getMessage());
          }
      }
  
      private <T> Result<T> errorResponse(ExecutionException ex) {
          if (isNotSupported(ex.getCause())) {
              return unsupportedVersion();
          } else {
              return Result.ofThrowable(-1, ex.getCause());
          }
      }
  
      @GetMapping("/state_single")
      public Result<ClusterUniversalStateVO> apiGetClusterState(@RequestParam String app,
                                                                @RequestParam String ip,
                                                                @RequestParam Integer port) {
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app cannot be null or empty");
          }
          if (StringUtil.isEmpty(ip)) {
              return Result.ofFail(-1, "ip cannot be null or empty");
          }
          if (port == null || port <= 0) {
              return Result.ofFail(-1, "Invalid parameter: port");
          }
          if (!checkIfSupported(app, ip, port)) {
              return unsupportedVersion();
          }
          try {
              return clusterConfigService.getClusterUniversalState(app, ip, port)
                  .thenApply(Result::ofSuccess)
                  .get();
          } catch (ExecutionException ex) {
              logger.error("Error when fetching cluster state", ex.getCause());
              return errorResponse(ex);
          } catch (Throwable throwable) {
              logger.error("Error when fetching cluster state", throwable);
              return Result.ofFail(-1, throwable.getMessage());
          }
      }
  
      @GetMapping("/server_state/{app}")
      public Result<List<AppClusterServerStateWrapVO>> apiGetClusterServerStateOfApp(@PathVariable String app) {
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app cannot be null or empty");
          }
          try {
              return clusterConfigService.getClusterUniversalState(app)
                  .thenApply(ClusterEntityUtils::wrapToAppClusterServerState)
                  .thenApply(Result::ofSuccess)
                  .get();
          } catch (ExecutionException ex) {
              logger.error("Error when fetching cluster server state of app: " + app, ex.getCause());
              return errorResponse(ex);
          } catch (Throwable throwable) {
              logger.error("Error when fetching cluster server state of app: " + app, throwable);
              return Result.ofFail(-1, throwable.getMessage());
          }
      }
  
      @GetMapping("/client_state/{app}")
      public Result<List<AppClusterClientStateWrapVO>> apiGetClusterClientStateOfApp(@PathVariable String app) {
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app cannot be null or empty");
          }
          try {
              return clusterConfigService.getClusterUniversalState(app)
                  .thenApply(ClusterEntityUtils::wrapToAppClusterClientState)
                  .thenApply(Result::ofSuccess)
                  .get();
          } catch (ExecutionException ex) {
              logger.error("Error when fetching cluster token client state of app: " + app, ex.getCause());
              return errorResponse(ex);
          } catch (Throwable throwable) {
              logger.error("Error when fetching cluster token client state of app: " + app, throwable);
              return Result.ofFail(-1, throwable.getMessage());
          }
      }
  
      @GetMapping("/state/{app}")
      public Result<List<ClusterUniversalStatePairVO>> apiGetClusterStateOfApp(@PathVariable String app) {
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app cannot be null or empty");
          }
          try {
              return clusterConfigService.getClusterUniversalState(app)
                  .thenApply(Result::ofSuccess)
                  .get();
          } catch (ExecutionException ex) {
              logger.error("Error when fetching cluster state of app: " + app, ex.getCause());
              return errorResponse(ex);
          } catch (Throwable throwable) {
              logger.error("Error when fetching cluster state of app: " + app, throwable);
              return Result.ofFail(-1, throwable.getMessage());
          }
      }
  
      private boolean isNotSupported(Throwable ex) {
          return ex instanceof CommandNotFoundException;
      }
  
      private boolean checkIfSupported(String app, String ip, int port) {
          try {
              return Optional.ofNullable(appManagement.getDetailApp(app))
                  .flatMap(e -> e.getMachine(ip, port))
                  .flatMap(m -> VersionUtils.parseVersion(m.getVersion())
                      .map(v -> v.greaterOrEqual(version140)))
                  .orElse(true);
              // If error occurred or cannot retrieve machine info, return true.
          } catch (Exception ex) {
              return true;
          }
      }
  
      private Result<Boolean> checkValidRequest(ClusterModifyRequest request) {
          if (StringUtil.isEmpty(request.getApp())) {
              return Result.ofFail(-1, "app cannot be empty");
          }
          if (StringUtil.isEmpty(request.getIp())) {
              return Result.ofFail(-1, "ip cannot be empty");
          }
          if (request.getPort() == null || request.getPort() < 0) {
              return Result.ofFail(-1, "invalid port");
          }
          if (request.getMode() == null || request.getMode() < 0) {
              return Result.ofFail(-1, "invalid mode");
          }
          if (!checkIfSupported(request.getApp(), request.getIp(), request.getPort())) {
              return unsupportedVersion();
          }
          return null;
      }
  
      private <R> Result<R> unsupportedVersion() {
          return Result.ofFail(4041, "Sentinel client not supported for cluster flow control (unsupported version or dependency absent)");
      }
  
      private static final String KEY_MODE = "mode";
  }
  