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.v2;
  
  import java.util.Date;
  import java.util.List;
  
  import com.alibaba.csp.sentinel.dashboard.auth.AuthAction;
  import com.alibaba.csp.sentinel.dashboard.auth.AuthService;
  import com.alibaba.csp.sentinel.dashboard.auth.AuthService.PrivilegeType;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
  import com.alibaba.csp.sentinel.dashboard.repository.rule.InMemoryRuleRepositoryAdapter;
  import com.alibaba.csp.sentinel.dashboard.rule.DynamicRuleProvider;
  import com.alibaba.csp.sentinel.dashboard.rule.DynamicRulePublisher;
  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.beans.factory.annotation.Qualifier;
  import org.springframework.web.bind.annotation.DeleteMapping;
  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.PutMapping;
  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;
  
  /**
   * Flow rule controller (v2).
   *
   * @author Eric Zhao
   * @since 1.4.0
   */
  @RestController
  @RequestMapping(value = "/v2/flow")
  public class FlowControllerV2 {
  
      private final Logger logger = LoggerFactory.getLogger(FlowControllerV2.class);
  
      @Autowired
      private InMemoryRuleRepositoryAdapter<FlowRuleEntity> repository;
  
      @Autowired
      @Qualifier("flowRuleDefaultProvider")
      private DynamicRuleProvider<List<FlowRuleEntity>> ruleProvider;
      @Autowired
      @Qualifier("flowRuleDefaultPublisher")
      private DynamicRulePublisher<List<FlowRuleEntity>> rulePublisher;
  
      @GetMapping("/rules")
      @AuthAction(PrivilegeType.READ_RULE)
      public Result<List<FlowRuleEntity>> apiQueryMachineRules(@RequestParam String app) {
  
          if (StringUtil.isEmpty(app)) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
          try {
              List<FlowRuleEntity> rules = ruleProvider.getRules(app);
              if (rules != null && !rules.isEmpty()) {
                  for (FlowRuleEntity entity : rules) {
                      entity.setApp(app);
                      if (entity.getClusterConfig() != null && entity.getClusterConfig().getFlowId() != null) {
                          entity.setId(entity.getClusterConfig().getFlowId());
                      }
                  }
              }
              rules = repository.saveAll(rules);
              return Result.ofSuccess(rules);
          } catch (Throwable throwable) {
              logger.error("Error when querying flow rules", throwable);
              return Result.ofThrowable(-1, throwable);
          }
      }
  
      private <R> Result<R> checkEntityInternal(FlowRuleEntity entity) {
          if (entity == null) {
              return Result.ofFail(-1, "invalid body");
          }
          if (StringUtil.isBlank(entity.getApp())) {
              return Result.ofFail(-1, "app can't be null or empty");
          }
          if (StringUtil.isBlank(entity.getLimitApp())) {
              return Result.ofFail(-1, "limitApp can't be null or empty");
          }
          if (StringUtil.isBlank(entity.getResource())) {
              return Result.ofFail(-1, "resource can't be null or empty");
          }
          if (entity.getGrade() == null) {
              return Result.ofFail(-1, "grade can't be null");
          }
          if (entity.getGrade() != 0 && entity.getGrade() != 1) {
              return Result.ofFail(-1, "grade must be 0 or 1, but " + entity.getGrade() + " got");
          }
          if (entity.getCount() == null || entity.getCount() < 0) {
              return Result.ofFail(-1, "count should be at lease zero");
          }
          if (entity.getStrategy() == null) {
              return Result.ofFail(-1, "strategy can't be null");
          }
          if (entity.getStrategy() != 0 && StringUtil.isBlank(entity.getRefResource())) {
              return Result.ofFail(-1, "refResource can't be null or empty when strategy!=0");
          }
          if (entity.getControlBehavior() == null) {
              return Result.ofFail(-1, "controlBehavior can't be null");
          }
          int controlBehavior = entity.getControlBehavior();
          if (controlBehavior == 1 && entity.getWarmUpPeriodSec() == null) {
              return Result.ofFail(-1, "warmUpPeriodSec can't be null when controlBehavior==1");
          }
          if (controlBehavior == 2 && entity.getMaxQueueingTimeMs() == null) {
              return Result.ofFail(-1, "maxQueueingTimeMs can't be null when controlBehavior==2");
          }
          if (entity.isClusterMode() && entity.getClusterConfig() == null) {
              return Result.ofFail(-1, "cluster config should be valid");
          }
          return null;
      }
  
      @PostMapping("/rule")
      @AuthAction(value = AuthService.PrivilegeType.WRITE_RULE)
      public Result<FlowRuleEntity> apiAddFlowRule(@RequestBody FlowRuleEntity entity) {
  
          Result<FlowRuleEntity> checkResult = checkEntityInternal(entity);
          if (checkResult != null) {
              return checkResult;
          }
          entity.setId(null);
          Date date = new Date();
          entity.setGmtCreate(date);
          entity.setGmtModified(date);
          entity.setLimitApp(entity.getLimitApp().trim());
          entity.setResource(entity.getResource().trim());
          try {
              entity = repository.save(entity);
              publishRules(entity.getApp());
          } catch (Throwable throwable) {
              logger.error("Failed to add flow rule", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          return Result.ofSuccess(entity);
      }
  
      @PutMapping("/rule/{id}")
      @AuthAction(AuthService.PrivilegeType.WRITE_RULE)
  
      public Result<FlowRuleEntity> apiUpdateFlowRule(@PathVariable("id") Long id,
                                                      @RequestBody FlowRuleEntity entity) {
          if (id == null || id <= 0) {
              return Result.ofFail(-1, "Invalid id");
          }
          FlowRuleEntity oldEntity = repository.findById(id);
          if (oldEntity == null) {
              return Result.ofFail(-1, "id " + id + " does not exist");
          }
          if (entity == null) {
              return Result.ofFail(-1, "invalid body");
          }
  
          entity.setApp(oldEntity.getApp());
          entity.setIp(oldEntity.getIp());
          entity.setPort(oldEntity.getPort());
          Result<FlowRuleEntity> checkResult = checkEntityInternal(entity);
          if (checkResult != null) {
              return checkResult;
          }
  
          entity.setId(id);
          Date date = new Date();
          entity.setGmtCreate(oldEntity.getGmtCreate());
          entity.setGmtModified(date);
          try {
              entity = repository.save(entity);
              if (entity == null) {
                  return Result.ofFail(-1, "save entity fail");
              }
              publishRules(oldEntity.getApp());
          } catch (Throwable throwable) {
              logger.error("Failed to update flow rule", throwable);
              return Result.ofThrowable(-1, throwable);
          }
          return Result.ofSuccess(entity);
      }
  
      @DeleteMapping("/rule/{id}")
      @AuthAction(PrivilegeType.DELETE_RULE)
      public Result<Long> apiDeleteRule(@PathVariable("id") Long id) {
          if (id == null || id <= 0) {
              return Result.ofFail(-1, "Invalid id");
          }
          FlowRuleEntity oldEntity = repository.findById(id);
          if (oldEntity == null) {
              return Result.ofSuccess(null);
          }
  
          try {
              repository.delete(id);
              publishRules(oldEntity.getApp());
          } catch (Exception e) {
              return Result.ofFail(-1, e.getMessage());
          }
          return Result.ofSuccess(id);
      }
  
      private void publishRules(/*@NonNull*/ String app) throws Exception {
          List<FlowRuleEntity> rules = repository.findAllByApp(app);
          rulePublisher.publish(app, rules);
      }
  }
  