详解Spring Cloud Gateway 数据库存储路由信息的扩展方案

动态路由背景

​ 无论你在使用Zuul还是Spring Cloud Gateway 的时候，官方文档提供的方案总是基于配置文件配置的方式

例如：

 # zuul 的配置形式
 routes:
  pig-auth:
   path: /auth
@Slf4j
@AllArgsConstructor
@Service("sysRouteConfService")
public class SysRouteConfServiceImpl extends ServiceImpl implements SysRouteConfService {
  private final RedisTemplate redisTemplate;
  private final ApplicationEventPublisher applicationEventPublisher;

  
  @Override
  public List routes() {
    SysRouteConf condition = new SysRouteConf();
    condition.setDelFlag(CommonConstant.STATUS_NORMAL);
    return baseMapper.selectList(new EntityWrapper<>(condition));
  }

  
  @Override
  public Mono editRoutes(JSonArray routes) {
    // 清空Redis 缓存
    Boolean result = redisTemplate.delete(CommonConstant.ROUTE_KEY);
    log.info("清空网关路由 {} ", result);

    // 遍历修改的routes，保存到Redis
    List routeDefinitionVoList = new ArrayList<>();
    routes.forEach(value -> {
      log.info("更新路由 ->{}", value);
      RouteDefinitionVo vo = new RouteDefinitionVo();
      Map map = (Map) value;

      Object id = map.get("routeId");
      if (id != null) {
 vo.setId(String.valueOf(id));
      }

      Object predicates = map.get("predicates");
      if (predicates != null) {
 JSonArray predicatesArray = (JSONArray) predicates;
 List predicateDefinitionList =
   predicatesArray.toList(PredicateDefinition.class);
 vo.setPredicates(predicateDefinitionList);
      }

      Object filters = map.get("filters");
      if (filters != null) {
 JSonArray filtersArray = (JSONArray) filters;
 List filterDefinitionList
   = filtersArray.toList(FilterDefinition.class);
 vo.setFilters(filterDefinitionList);
      }

      Object uri = map.get("uri");
      if (uri != null) {
 vo.setUri(URI.create(String.valueOf(uri)));
      }

      Object order = map.get("order");
      if (order != null) {
 vo.setOrder(Integer.parseInt(String.valueOf(order)));
      }

      redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class));
      redisTemplate.opsForHash().put(CommonConstant.ROUTE_KEY, vo.getId(), vo);
      routeDefinitionVoList.add(vo);
    });

    // 逻辑删除全部
    SysRouteConf condition = new SysRouteConf();
    condition.setDelFlag(CommonConstant.STATUS_NORMAL);
    this.delete(new EntityWrapper<>(condition));

    //插入生效路由
    List routeConfList = routeDefinitionVoList.stream().map(vo -> {
      SysRouteConf routeConf = new SysRouteConf();
      routeConf.setRouteId(vo.getId());
      routeConf.setFilters(JSONUtil.toJsonStr(vo.getFilters()));
      routeConf.setPredicates(JSONUtil.toJsonStr(vo.getPredicates()));
      routeConf.setOrder(vo.getOrder());
      routeConf.setUri(vo.getUri().toString());
      return routeConf;
    }).collect(Collectors.toList());
    this.insertBatch(routeConfList);
    log.debug("更新网关路由结束 ");

    this.applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this));
    return Mono.empty();
  }
}

网关自定义RedisRouteDefinitionRepository

 @Slf4j
 @Component
 @AllArgsConstructor
 public class RedisRouteDefinitionWriter implements RouteDefinitionRepository {
   private final RedisTemplate redisTemplate;
 
   @Override
   public Mono save(Mono route) {
     return route.flatMap(r -> {
RouteDefinitionVo vo = new RouteDefinitionVo();
BeanUtils.copyProperties(r, vo);
log.info("保存路由信息{}", vo);
redisTemplate.opsForHash().put(CommonConstant.ROUTE_KEY, r.getId(), vo);
return Mono.empty();
     });
   }
   @Override
   public Mono delete(Mono routeId) {
     routeId.subscribe(id -> {
log.info("删除路由信息{}", id);
redisTemplate.opsForHash().delete(CommonConstant.ROUTE_KEY, id);
     });
     return Mono.empty();
   }
 
   @Override
   public Flux getRouteDefinitions() {
     redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class));
     List values = redisTemplate.opsForHash().values(CommonConstant.ROUTE_KEY);
     List definitionList = new ArrayList<>();
     values.forEach(vo -> {
RouteDefinition routeDefinition = new RouteDefinition();
BeanUtils.copyProperties(vo, routeDefinition);
definitionList.add(vo);
     });
     log.debug("redis 中路由定义条数： {}， {}", definitionList.size(), definitionList);
     return Flux.fromIterable(definitionList);
   }
 }

3.库表定义

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