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/** serviceId: pig-auth stripPrefix: true # gateway 的配置形式 routes: - id: pigx-auth uri: lb://pigx-auth predicates: - Path=/auth/** filters: - ValidateCodeGatewayFilter 

配置更改需要重启服务，不能满足实际生产过程中的动态刷新、实时变更的业务需求。

​ 基于以上分析 pig已经提供了基于Zuul版本的动态路由功能，附Git 地址传送门,效果如下图可以实时配置修改刷新。

Spring Cloud Gateway 路由加载源码

1. DispatcherHandler 接管用户请求
2. RoutePredicateHandlerMapping 路由匹配
   1. 根据RouteLocator获取 RouteDefinitionLocator
   2. 返回多个RouteDefinitionLocator.getRouteDefinitions()的路由定义信息
3. FilteringWebHandler执行路由定义中的filter 最后路由到具体的业务服务中

Spring Cloud Gateway 默认动态路由实现

GatewayControllerEndpoint 基于actuate端点的默认实现，支持JVM 级别的动态路由，不能序列化存储

// 上图动态路由的信息保存的默认实现是基于内存的实现 public class InMemoryRouteDefinitionRepository implements RouteDefinitionRepository { private final Map<String, RouteDefinition> routes = synchronizedMap(new LinkedHashMap<String, RouteDefinition>()); @Override public Mono<Void> save(Mono<RouteDefinition> route){} @Override public Mono<Void> delete(Mono<String> routeId){} @Override public Flux<RouteDefinition> getRouteDefinitions(){} } 

扩展基于Mysql + Redis存储分布式动态组件

为什么使用Mysql的同时，又要使用Redis？

1. spring cloud gateway 基于webflux 背压，暂时不支持mysql 数据库
2. redis-reactive 支持 spring cloud gateway 的背压，同时还可以实现分布式，高性能

扩展思路

1. 增加一个路由管理模块，参考GatewayControllerEndpoint实现，启动时加载数据库中配置文件到Redis
2. 网关模块重写RouteDefinitionRepository，getRouteDefinitions（）取Redis中读取即可实现
3. 前端配合 json-view 类似插件，直接修改展示。

具体实现

1. 路由管理模块核心处理逻辑，获取路由和更新路由

/** * @author lengleng * @date 2018年11月06日10:27:55 * <p> * 动态路由处理类 */ @Slf4j @AllArgsConstructor @Service("sysRouteConfService") public class SysRouteConfServiceImpl extends ServiceImpl<SysRouteConfMapper, SysRouteConf> implements SysRouteConfService { private final RedisTemplate redisTemplate; private final ApplicationEventPublisher applicationEventPublisher; /** * 获取全部路由 * <p> * RedisRouteDefinitionWriter.java * PropertiesRouteDefinitionLocator.java * * @return */ @Override public List<SysRouteConf> routes() { SysRouteConf condition = new SysRouteConf(); condition.setDelFlag(CommonConstant.STATUS_NORMAL); return baseMapper.selectList(new EntityWrapper<>(condition)); } /** * 更新路由信息 * * @param routes 路由信息 * @return */ @Override public Mono<Void> 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<RouteDefinitionVo> routeDefinitionVoList = new ArrayList<>(); routes.forEach(value -> { log.info("更新路由 ->{}", value); RouteDefinitionVo vo = new RouteDefinitionVo(); Map<String, Object> 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<PredicateDefinition> predicateDefinitionList = predicatesArray.toList(PredicateDefinition.class); vo.setPredicates(predicateDefinitionList); } Object filters = map.get("filters"); if (filters != null) { JSONArray filtersArray = (JSONArray) filters; List<FilterDefinition> 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<SysRouteConf> 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(); } } 

2. 网关自定义RedisRouteDefinitionRepository

   /** * @author lengleng * @date 2018/10/31 * <p> * redis 保存路由信息，优先级比配置文件高 */ @Slf4j @Component @AllArgsConstructor public class RedisRouteDefinitionWriter implements RouteDefinitionRepository { private final RedisTemplate redisTemplate; @Override public Mono<Void> save(Mono<RouteDefinition> 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<Void> delete(Mono<String> routeId) { routeId.subscribe(id -> { log.info("删除路由信息{}", id); redisTemplate.opsForHash().delete(CommonConstant.ROUTE_KEY, id); }); return Mono.empty(); } /** * 动态路由入口 * * @return */ @Override public Flux<RouteDefinition> getRouteDefinitions() { redisTemplate.setHashValueSerializer(new Jackson2JsonRedisSerializer<>(RouteDefinitionVo.class)); List<RouteDefinitionVo> values = redisTemplate.opsForHash().values(CommonConstant.ROUTE_KEY); List<RouteDefinition> 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