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;
  
  import java.util.Date;
  import java.util.List;
  
  import com.alibaba.csp.sentinel.dashboard.auth.AuthAction;
  import com.alibaba.csp.sentinel.dashboard.auth.AuthService.PrivilegeType;
  import com.alibaba.csp.sentinel.dashboard.discovery.AppManagement;
  import com.alibaba.csp.sentinel.dashboard.repository.rule.RuleRepository;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.SystemRuleEntity;
  import com.alibaba.csp.sentinel.dashboard.discovery.MachineInfo;
  import com.alibaba.csp.sentinel.dashboard.client.SentinelApiClient;
  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.RequestMapping;
  import org.springframework.web.bind.annotation.RestController;
  
  /**
   * @author leyou(lihao)
   */
  @RestController
  @RequestMapping("/system")
  public class SystemController {
  
      private final Logger logger = LoggerFactory.getLogger(SystemController.class);
  
      @Autowired
      private RuleRepository<SystemRuleEntity, Long> repository;
      @Autowired
      private SentinelApiClient sentinelApiClient;
      @Autowired
      private AppManagement appManagement;
  
      private <R> Result<R> checkBasicParams(String app, String ip, Integer port) {
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
          if (StringUtil.isEmpty(ip)) {
              return Result.ofFail(-1, "ip can't be null or empty");
          }
          if (port == null) {
              return Result.ofFail(-1, "port can't be null");
          }
          if (!appManagement.isValidMachineOfApp(app, ip)) {
              return Result.ofFail(-1, "given ip does not belong to given app");
          }
          if (port <= 0 || port > 65535) {
              return Result.ofFail(-1, "port should be in (0, 65535)");
          }
          return null;
      }
  
      @GetMapping("/rules.json")
      @AuthAction(PrivilegeType.READ_RULE)
      public Result<List<SystemRuleEntity>> apiQueryMachineRules(String app, String ip,
                                                                 Integer port) {
          Result<List<SystemRuleEntity>> checkResult = checkBasicParams(app, ip, port);
          if (checkResult != null) {
              return checkResult;
          }
          try {
              List<SystemRuleEntity> rules = sentinelApiClient.fetchSystemRuleOfMachine(app, ip, port);
              rules = repository.saveAll(rules);
              return Result.ofSuccess(rules);
          } catch (Throwable throwable) {
              logger.error("Query machine system rules error", throwable);
              return Result.ofThrowable(-1, throwable);
          }
      }
  
      private int countNotNullAndNotNegative(Number... values) {
          int notNullCount = 0;
          for (int i = 0; i < values.length; i++) {
              if (values[i] != null && values[i].doubleValue() >= 0) {
                  notNullCount++;
              }
          }
          return notNullCount;
      }
  
      @RequestMapping("/new.json")
      @AuthAction(PrivilegeType.WRITE_RULE)
      public Result<SystemRuleEntity> apiAdd(String app, String ip, Integer port,
                                             Double highestSystemLoad, Double highestCpuUsage, Long avgRt,
                                             Long maxThread, Double qps) {
  
          Result<SystemRuleEntity> checkResult = checkBasicParams(app, ip, port);
          if (checkResult != null) {
              return checkResult;
          }
  
          int notNullCount = countNotNullAndNotNegative(highestSystemLoad, avgRt, maxThread, qps, highestCpuUsage);
          if (notNullCount != 1) {
              return Result.ofFail(-1, "only one of [highestSystemLoad, avgRt, maxThread, qps,highestCpuUsage] "
                  + "value must be set > 0, but " + notNullCount + " values get");
          }
          if (null != highestCpuUsage && highestCpuUsage > 1) {
              return Result.ofFail(-1, "highestCpuUsage must between [0.0, 1.0]");
          }
          SystemRuleEntity entity = new SystemRuleEntity();
          entity.setApp(app.trim());
          entity.setIp(ip.trim());
          entity.setPort(port);
          // -1 is a fake value
          if (null != highestSystemLoad) {
              entity.setHighestSystemLoad(highestSystemLoad);
          } else {
              entity.setHighestSystemLoad(-1D);
          }
  
          if (null != highestCpuUsage) {
              entity.setHighestCpuUsage(highestCpuUsage);
          } else {
              entity.setHighestCpuUsage(-1D);
          }
  
          if (avgRt != null) {
              entity.setAvgRt(avgRt);
          } else {
              entity.setAvgRt(-1L);
          }
          if (maxThread != null) {
              entity.setMaxThread(maxThread);
          } else {
              entity.setMaxThread(-1L);
          }
          if (qps != null) {
              entity.setQps(qps);
          } else {
              entity.setQps(-1D);
          }
          Date date = new Date();
          entity.setGmtCreate(date);
          entity.setGmtModified(date);
          try {
              entity = repository.save(entity);
          } catch (Throwable throwable) {
              logger.error("Add SystemRule error", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          if (!publishRules(app, ip, port)) {
              logger.warn("Publish system rules fail after rule add");
          }
          return Result.ofSuccess(entity);
      }
  
      @GetMapping("/save.json")
      @AuthAction(PrivilegeType.WRITE_RULE)
      public Result<SystemRuleEntity> apiUpdateIfNotNull(Long id, String app, Double highestSystemLoad,
              Double highestCpuUsage, Long avgRt, Long maxThread, Double qps) {
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
          SystemRuleEntity entity = repository.findById(id);
          if (entity == null) {
              return Result.ofFail(-1, "id " + id + " dose not exist");
          }
  
          if (StringUtil.isNotBlank(app)) {
              entity.setApp(app.trim());
          }
          if (highestSystemLoad != null) {
              if (highestSystemLoad < 0) {
                  return Result.ofFail(-1, "highestSystemLoad must >= 0");
              }
              entity.setHighestSystemLoad(highestSystemLoad);
          }
          if (highestCpuUsage != null) {
              if (highestCpuUsage < 0) {
                  return Result.ofFail(-1, "highestCpuUsage must >= 0");
              }
              if (highestCpuUsage > 1) {
                  return Result.ofFail(-1, "highestCpuUsage must <= 1");
              }
              entity.setHighestCpuUsage(highestCpuUsage);
          }
          if (avgRt != null) {
              if (avgRt < 0) {
                  return Result.ofFail(-1, "avgRt must >= 0");
              }
              entity.setAvgRt(avgRt);
          }
          if (maxThread != null) {
              if (maxThread < 0) {
                  return Result.ofFail(-1, "maxThread must >= 0");
              }
              entity.setMaxThread(maxThread);
          }
          if (qps != null) {
              if (qps < 0) {
                  return Result.ofFail(-1, "qps must >= 0");
              }
              entity.setQps(qps);
          }
          Date date = new Date();
          entity.setGmtModified(date);
          try {
              entity = repository.save(entity);
          } catch (Throwable throwable) {
              logger.error("save error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          if (!publishRules(entity.getApp(), entity.getIp(), entity.getPort())) {
              logger.info("publish system rules fail after rule update");
          }
          return Result.ofSuccess(entity);
      }
  
      @RequestMapping("/delete.json")
      @AuthAction(PrivilegeType.DELETE_RULE)
      public Result<?> delete(Long id) {
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
          SystemRuleEntity oldEntity = repository.findById(id);
          if (oldEntity == null) {
              return Result.ofSuccess(null);
          }
          try {
              repository.delete(id);
          } catch (Throwable throwable) {
              logger.error("delete error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          if (!publishRules(oldEntity.getApp(), oldEntity.getIp(), oldEntity.getPort())) {
              logger.info("publish system rules fail after rule delete");
          }
          return Result.ofSuccess(id);
      }
  
      private boolean publishRules(String app, String ip, Integer port) {
          List<SystemRuleEntity> rules = repository.findAllByMachine(MachineInfo.of(app, ip, port));
          return sentinelApiClient.setSystemRuleOfMachine(app, ip, port, rules);
      }
  }
  