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
- DispatcherHandler 接管用户请求
RoutePredicateHandlerMapping 路由匹配
- 根据RouteLocator获取 RouteDefinitionLocator
- 返回多个RouteDefinitionLocator.getRouteDefinitions()的路由定义信息
- 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
- 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
- 网关模块重写RouteDefinitionRepository，getRouteDefinitions（）取Redis中读取即可实现
- 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
