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" title="Spring Cloud">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?

  • spring cloud gateway 基于webflux 背压,暂时不支持mysql 数据库
  • Redis-reactive 支持 spring cloudgateway 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

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();

}

}

网关自定义RedisRouteDefinitionRepository

@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();

}

@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

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