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.client.SentinelApiClient;
  import com.alibaba.csp.sentinel.dashboard.discovery.MachineInfo;
  import com.alibaba.csp.sentinel.dashboard.auth.AuthService.PrivilegeType;
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.DegradeRuleEntity;
  import com.alibaba.csp.sentinel.dashboard.domain.Result;
  import com.alibaba.csp.sentinel.dashboard.repository.rule.InMemDegradeRuleStore;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.http.MediaType;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  /**
   * @author leyou
   */
  @Controller
  @RequestMapping(value = "/degrade", produces = MediaType.APPLICATION_JSON_VALUE)
  public class DegradeController {
  
      private final Logger logger = LoggerFactory.getLogger(DegradeController.class);
  
      @Autowired
      private InMemDegradeRuleStore repository;
      @Autowired
      private SentinelApiClient sentinelApiClient;
  
      @ResponseBody
      @RequestMapping("/rules.json")
      @AuthAction(PrivilegeType.READ_RULE)
      public Result<List<DegradeRuleEntity>> queryMachineRules(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");
          }
          try {
              List<DegradeRuleEntity> rules = sentinelApiClient.fetchDegradeRuleOfMachine(app, ip, port);
              rules = repository.saveAll(rules);
              return Result.ofSuccess(rules);
          } catch (Throwable throwable) {
              logger.error("queryApps error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
      }
  
      @ResponseBody
      @RequestMapping("/new.json")
      @AuthAction(PrivilegeType.WRITE_RULE)
      public Result<DegradeRuleEntity> add(String app, String ip, Integer port, String limitApp, String resource,
                                           Double count, Integer timeWindow, Integer grade) {
          if (StringUtil.isBlank(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
          if (StringUtil.isBlank(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 (StringUtil.isBlank(limitApp)) {
              return Result.ofFail(-1, "limitApp can't be null or empty");
          }
          if (StringUtil.isBlank(resource)) {
              return Result.ofFail(-1, "resource can't be null or empty");
          }
          if (count == null) {
              return Result.ofFail(-1, "count can't be null");
          }
          if (timeWindow == null) {
              return Result.ofFail(-1, "timeWindow can't be null");
          }
          if (grade == null) {
              return Result.ofFail(-1, "grade can't be null");
          }
          if (grade < RuleConstant.DEGRADE_GRADE_RT || grade > RuleConstant.DEGRADE_GRADE_EXCEPTION_COUNT) {
              return Result.ofFail(-1, "Invalid grade: " + grade);
          }
          DegradeRuleEntity entity = new DegradeRuleEntity();
          entity.setApp(app.trim());
          entity.setIp(ip.trim());
          entity.setPort(port);
          entity.setLimitApp(limitApp.trim());
          entity.setResource(resource.trim());
          entity.setCount(count);
          entity.setTimeWindow(timeWindow);
          entity.setGrade(grade);
          Date date = new Date();
          entity.setGmtCreate(date);
          entity.setGmtModified(date);
          try {
              entity = repository.save(entity);
          } catch (Throwable throwable) {
              logger.error("add error:", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          if (!publishRules(app, ip, port)) {
              logger.info("publish degrade rules fail after rule add");
          }
          return Result.ofSuccess(entity);
      }
  
      @ResponseBody
      @RequestMapping("/save.json")
      @AuthAction(PrivilegeType.WRITE_RULE)
      public Result<DegradeRuleEntity> updateIfNotNull(Long id, String app, String limitApp, String resource,
                                                       Double count, Integer timeWindow, Integer grade) {
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
          if (grade != null) {
              if (grade < RuleConstant.DEGRADE_GRADE_RT || grade > RuleConstant.DEGRADE_GRADE_EXCEPTION_COUNT) {
                  return Result.ofFail(-1, "Invalid grade: " + grade);
              }
          }
          DegradeRuleEntity 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 (StringUtil.isNotBlank(limitApp)) {
              entity.setLimitApp(limitApp.trim());
          }
          if (StringUtil.isNotBlank(resource)) {
              entity.setResource(resource.trim());
          }
          if (count != null) {
              entity.setCount(count);
          }
          if (timeWindow != null) {
              entity.setTimeWindow(timeWindow);
          }
          if (grade != null) {
              entity.setGrade(grade);
          }
          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 degrade rules fail after rule update");
          }
          return Result.ofSuccess(entity);
      }
  
      @ResponseBody
      @RequestMapping("/delete.json")
      @AuthAction(PrivilegeType.DELETE_RULE)
      public Result<Long> delete(Long id) {
          if (id == null) {
              return Result.ofFail(-1, "id can't be null");
          }
  
          DegradeRuleEntity 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 degrade rules fail after rule delete");
          }
          return Result.ofSuccess(id);
      }
  
      private boolean publishRules(String app, String ip, Integer port) {
          List<DegradeRuleEntity> rules = repository.findAllByMachine(MachineInfo.of(app, ip, port));
          return sentinelApiClient.setDegradeRuleOfMachine(app, ip, port, rules);
      }
  }
  