spring cloud gateway使用 uri: lb://方式配置时,服务名的特殊要求

网友投稿 222 2023-02-10

在gateway中配置uri配置有三种方式，包括

第一种：ws(websocket)方式: uri: ws://localhost:9000

第二种：http方式: uri: http://localhost:8130/

第三种：lb(注册中心中服务名字)方式: uri: lb://brilliance-consumer

其中ws和http方式不容易出错，因为http格式比较固定，但是lb方式比较灵活自由。不考虑网关，只考虑服务时，服务名命名时比较自由，都能启动被访问，被注册到注册中心，但是如果提供给gateway使用时，就会对服务命名方式有特殊要求了。

能被gateway的lb方式识别到的命名规则为：

"[a-zA-Z]([a-zA-Z]|\\d|\\+|\\.|-)*:.*"

这也意味着，java命名规范中可以使用的英文下划线（"_"）不能被识别,而我命名为：brilliance_consumer，刚好带下划线，改为brilliance-consumer后则可以正常通过网关访问自己项目。

如果名字中有非*“a-zA-Z:.”*规则字符，则会报错，

规则见包org.springframework.cloud.gateway.filter中的类RouteToRequestUrlFilter：

报异常信息为：

java.lang.IllegalStateException: Invalid host: lb://brilliance_consumer

at org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter.filter(RouteToRequestUrlFilter.java:86) ~[spring-cloud-gateway-server-2.2.6.RELEASE.jar:2.2.6.RELEASE]

Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:

Error has been observed at the following site(s):

|_ checkpoint ⇢ org.springframework.web.cors.reactive.CorsWebFilter [DefaultWebFilterChain]

|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]

|_ checkpoint ⇢ HTTP GET "/api/product/productDetail" [ExceptionHandlingWebHandler]

Stack trace:

at org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter.filter(RouteToRequestUrlFilter.java:86) ~[spring-cloud-gateway-server-2.2.6.RELEASE.jar:2.2.6.RELEASE]

at org.springframework.cloud.gateway.handler.FilteringWebHandler$GatewayFilterAdapter.filter(FilteringWebHandler.java:138) ~[spring-cloud-gateway-server-2.2.6.RELEASE.jar:2.2.6.RELEASE]

at org.springframework.cloud.gateway.filter.OrderedGatewayFilter.filter(OrderedGatewayFilter.java:44) ~[spring-cloud-gateway-server-2.2.6.RELEASE.jar:2.2.6.RELEASE]

at org.springframework.cloud.gateway.handler.FilteringWebHandler$DefaultGatewayFilterChain.lambda$filter$0(FilteringWebHandler.java:118) ~[spring-cloud-gateway-server-2.2.6.RELEASE.jar:2.2.6.RELEASE]

at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) [reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Mono.subscribe(Mono.java:4252) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Mono.subscribe(Mono.java:4252) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:274) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:851) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:144) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:274) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:851) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:173) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1782) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onNext(MonoFilterWhen.java:140) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2344) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoFilterWhen$MonoFilterWhenMain.onSubscribe(MonoFilterWhen.java:103) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Mono.subscribe(Mono.java:4252) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:441) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onNext(FluxConcatMap.java:243) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:91) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:38) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxIterable$IterableSubscription.slowPath(FluxIterable.java:267) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:225) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:120) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:228) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:70) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:161) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:86) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.InternalFluxOperator.subscribe(InternalFluxOperator.java:62) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxDefer.subscribe(FluxDefer.java:54) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.Mono.subscribe(Mono.java:4252) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:441) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]

at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:211) ~[reactor-core-3.3.12.RELEASE.jar:3.3.12.RELEASE]