SpringCloud Gateway使用redis实现动态路由的方法
1. 将 actuator 端点暴露出来
management:
endpoints:
web:
exposure:
include: "*"
2. redis 配置
https://www.jb51.net/article/203766.htm
3. 将原内存路由持久化到 redis
@Component public class RedisRouteDefinitionRepository implements RouteDefinitionRepository { /** * hash存储的key */ public static final String GATEWAY_ROUTES = "gateway_dynamic_route"; @Resource private StringRedisTemplate redisTemplate; /** * 获取路由信息 * @return */ @Override public Flux<RouteDefinition> getRouteDefinitions() { List<RouteDefinition> routeDefinitions = new ArrayList<>(); redisTemplate.opsForHash().values(GATEWAY_ROUTES).stream() .forEach(routeDefinition -> routeDefinitions.add(JSON.parseObject(routeDefinition.toString(), RouteDefinition.class))); return Flux.fromIterable(routeDefinitions); } @Override public Mono<Void> save(Mono<RouteDefinition> route) { return route.flatMap(routeDefinition -> { redisTemplate.opsForHash().put(GATEWAY_ROUTES, routeDefinition.getId(), JSONObject.toJSONString(routeDefinition)); return Mono.empty(); }); } @Override public Mono<Void> delete(Mono<String> routeId) { return routeId.flatMap(id -> { if (redisTemplate.opsForHash().hasKey(GATEWAY_ROUTES, id)) { redisTemplate.opsForHash().delete(GATEWAY_ROUTES, id); return Mono.empty(); } return Mono.defer(() -> Mono.error(new NotFoundException("route definition is not found, routeId:" + routeId))); }); } }
4. 重写动态路由服务
@Service public class GatewayDynamicRouteService implements ApplicationEventPublisherAware { @Resource private RedisRouteDefinitionRepository redisRouteDefinitionRepository; private ApplicationEventPublisher applicationEventPublisher; /** * 增加路由 * @param routeDefinition * @return */ public int add(RouteDefinition routeDefinition) { redisRouteDefinitionRepository.save(Mono.just(routeDefinition)).subscribe(); applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this)); return 1; } /** * 更新 * @param routeDefinition * @return */ public int update(RouteDefinition routeDefinition) { redisRouteDefinitionRepository.delete(Mono.just(routeDefinition.getId())); redisRouteDefinitionRepository.save(Mono.just(routeDefinition)).subscribe(); applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this)); return 1; } /** * 删除 * @param id * @return */ public Mono<ResponseEntity<Object>> delete(String id) { return redisRouteDefinitionRepository.delete(Mono.just(id)).then(Mono.defer(() -> Mono.just(ResponseEntity.ok().build()))) .onErrorResume(t -> t instanceof NotFoundException, t -> Mono.just(ResponseEntity.notFound().build())); } @Override public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) { this.applicationEventPublisher = applicationEventPublisher; } }
5. 对外暴露接口
@RestController @RequestMapping("/gateway") public class GatewayDynamicRouteController { @Resource private GatewayDynamicRouteService gatewayDynamicRouteService; @PostMapping("/add") public String create(@RequestBody RouteDefinition entity) { int result = gatewayDynamicRouteService.add(entity); return String.valueOf(result); } @PostMapping("/update") public String update(@RequestBody RouteDefinition entity) { int result = gatewayDynamicRouteService.update(entity); return String.valueOf(result); } @DeleteMapping("/delete/{id}") public Mono<ResponseEntity<Object>> delete(@PathVariable String id) { return gatewayDynamicRouteService.delete(id); } }
测试
测试前删除我们配置的静态路由,因为静态路由和 redis 动态路由同时存在时取并集。
访问 http://localhost:2000/actuator/gateway/routes , 可以看到只有默认路由。
[ { "route_id": "CompositeDiscoveryClient_consul", "route_definition": { "id": "CompositeDiscoveryClient_consul", "predicates": [ { "name": "Path", "args": { "pattern": "/consul/**" } } ], "filters": [ { "name": "RewritePath", "args": { "regexp": "/consul/(?<remaining>.*)", "replacement": "/${remaining}" } } ], "uri": "lb://consul", "order": 0 }, "order": 0 }, { "route_id": "CompositeDiscoveryClient_idc-gateway", "route_definition": { "id": "CompositeDiscoveryClient_idc-gateway", "predicates": [ { "name": "Path", "args": { "pattern": "/idc-gateway/**" } } ], "filters": [ { "name": "RewritePath", "args": { "regexp": "/idc-gateway/(?<remaining>.*)", "replacement": "/${remaining}" } } ], "uri": "lb://idc-gateway", "order": 0 }, "order": 0 }, { "route_id": "CompositeDiscoveryClient_idc-provider1", "route_definition": { "id": "CompositeDiscoveryClient_idc-provider1", "predicates": [ { "name": "Path", "args": { "pattern": "/idc-provider1/**" } } ], "filters": [ { "name": "RewritePath", "args": { "regexp": "/idc-provider1/(?<remaining>.*)", "replacement": "/${remaining}" } } ], "uri": "lb://idc-provider1", "order": 0 }, "order": 0 }, { "route_id": "CompositeDiscoveryClient_idc-provider2", "route_definition": { "id": "CompositeDiscoveryClient_idc-provider2", "predicates": [ { "name": "Path", "args": { "pattern": "/idc-provider2/**" } } ], "filters": [ { "name": "RewritePath", "args": { "regexp": "/idc-provider2/(?<remaining>.*)", "replacement": "/${remaining}" } } ], "uri": "lb://idc-provider2", "order": 0 }, "order": 0 } ]
这个时候访问 http://192.168.124.5:2000/idc-provider1/provider1/1 根据结果可以推测能正确路由到 provider1, 测试结果一致。
创建 provider1 路由,将路径设置为 /p1/**,测试是否生效。
POST 请求 http://localhost:2000/gateway/add
{ "id":"provider1", "predicates":[ { "name":"Path", "args":{ "_genkey_0":"/p1/**" } }, { "name":"RemoteAddr", "args":{ "_genkey_0":"192.168.124.5/16" } } ], "filters":[ { "name":"StripPrefix", "args":{ "_genkey_0":"1" } } ], "uri":"lb://idc-provider1", "order":0 }
查看 redis 存储,或者请求 http://localhost:2000/actuator/gateway/routes , 都可以看到配置成功。
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