一文读懂Reactive Feign：底层请求调用原理及实现细节

我要做个有钱人20202024-04-02 15:36

### 文章目录

  • [@[TOC](文章目录)](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)
  • [前言](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)
  • [概述](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)
  • [二、问题原因分析](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)
  • [三、问题解决](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)
  • [总结](#文章目录 @TOC 前言 概述 二、问题原因分析 三、问题解决 总结)

前言

最近在编写调度框架，构思引入一个类型为"远程服务调用"的调度任务，该任务，主要用于实现远程服务 + 微服务请求调用。任务内容，大体分为两部分，第一部分，通过读取调度配置信息，获取远程服务请求信息后，进行请求调用；另一部分，通过取号服务，获取分布式序号，唯一标识调度结果，并存储。

系统基于WebFlux搭建，于是选择Reactive Feign + WebClient，进行服务调用。

概述

基于该调度任务的定位，自然而然，引入了Reactive Feign + WebClient。于是，在代码中，分别配置Reactive Feign、WebClient.Builder、LoadBalanced注解标记的WebClient.Builder。其中将LoadBalanced注解标记的bean，添加了@Primary注解标记。

java 复制代码 
@Bean
@Primary
@LoadBalanced
public WebClient.Builder microServiceWebClient() {
    return WebClient.builder();
}

@Bean
public WebClient.Builder normalWebClient() {
    return WebClient.builder();
}

启动项目，并当调度任务，调度到基于微服务进行请求的远程服务时，灾难的一刻发生了，请求出现如下错误。

java 复制代码 
reactor.core.Exceptions$ErrorCallbackNotImplemented: feign.FeignException$ServiceUnavailable: [503 Service Unavailable] during [GET] to [http://192.168.0.101:10001/sequence/distributeSequenceController/id] [SequenceFeign#distributeSequence()]: [LoadBalancer does not contain an instance for the service 192.168.0.101]
Caused by: feign.FeignException$ServiceUnavailable: [503 Service Unavailable] during [GET] to [http://192.168.0.101:10001/sequence/distributeSequenceController/id] [SequenceFeign#distributeSequence()]: [LoadBalancer does not contain an instance for the service 192.168.0.101]
	at feign.FeignException.serverErrorStatus(FeignException.java:256) ~[feign-core-11.8.jar:na]
	at feign.FeignException.errorStatus(FeignException.java:197) ~[feign-core-11.8.jar:na]
	at feign.FeignException.errorStatus(FeignException.java:185) ~[feign-core-11.8.jar:na]
	at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:92) ~[feign-core-11.8.jar:na]
	at reactivefeign.client.statushandler.ReactiveStatusHandlers$1.lambda$decode$0(ReactiveStatusHandlers.java:49) ~[feign-reactor-core-3.2.6.jar:na]
	at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:106) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onNext(FluxDefaultIfEmpty.java:101) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onNext(FluxDefaultIfEmpty.java:101) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:299) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFilterFuseable$FilterFuseableConditionalSubscriber.onNext(FluxFilterFuseable.java:337) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoCollect$CollectSubscriber.onComplete(MonoCollect.java:160) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onComplete(FluxOnAssembly.java:549) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2400) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.request(FluxOnAssembly.java:649) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoCollect$CollectSubscriber.onSubscribe(MonoCollect.java:104) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onSubscribe(FluxOnAssembly.java:633) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxJust.subscribe(FluxJust.java:68) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:64) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:157) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:180) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:854) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onNext(FluxMap.java:224) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:74) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:539) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:151) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:122) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:98) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:44) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drainAsync(FluxFlattenIterable.java:421) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.drain(FluxFlattenIterable.java:686) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFlattenIterable$FlattenIterableSubscriber.onNext(FluxFlattenIterable.java:250) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:74) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:249) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.complete(MonoIgnoreThen.java:292) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onNext(MonoIgnoreThen.java:187) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:236) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.onComplete(MonoIgnoreThen.java:203) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onComplete(MonoIgnoreElements.java:89) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onComplete(FluxDematerialize.java:121) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:91) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onNext(FluxDematerialize.java:44) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable$IterableSubscription.fastPath(FluxIterable.java:340) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable$IterableSubscription.request(FluxIterable.java:227) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.request(FluxDematerialize.java:127) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.request(FluxPeek.java:138) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreElements$IgnoreElementsSubscriber.onSubscribe(MonoIgnoreElements.java:72) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onSubscribe(FluxPeek.java:171) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxDematerialize$DematerializeSubscriber.onSubscribe(FluxDematerialize.java:77) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:165) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:87) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Mono.subscribe(Mono.java:4455) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.subscribeNext(MonoIgnoreThen.java:263) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:51) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:157) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:129) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.DrainUtils.postCompleteDrain(DrainUtils.java:132) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.DrainUtils.postComplete(DrainUtils.java:187) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxMaterialize$MaterializeSubscriber.onComplete(FluxMaterialize.java:141) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxTake$TakeSubscriber.onComplete(FluxTake.java:153) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxTake$TakeSubscriber.onNext(FluxTake.java:133) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.SerializedSubscriber.onNext(SerializedSubscriber.java:99) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.onNext(FluxTimeout.java:180) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:129) ~[reactor-core-3.4.24.jar:3.4.24]
	at org.springframework.cloud.commons.publisher.FluxFirstNonEmptyEmitting$FirstNonEmptyEmittingSubscriber.onComplete(FluxFirstNonEmptyEmitting.java:325) ~[spring-cloud-commons-3.1.4.jar:3.1.4]
	at reactor.core.publisher.FluxSubscribeOn$SubscribeOnSubscriber.onComplete(FluxSubscribeOn.java:166) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Operators.complete(Operators.java:137) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:148) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:87) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Flux.subscribe(Flux.java:8526) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:200) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMapMany.subscribeOrReturn(MonoFlatMapMany.java:49) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.Flux.subscribe(Flux.java:8512) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:200) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.MonoFlatMapMany.subscribeOrReturn(MonoFlatMapMany.java:49) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxFromMonoOperator.subscribe(FluxFromMonoOperator.java:76) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.publisher.FluxSubscribeOn$SubscribeOnSubscriber.run(FluxSubscribeOn.java:194) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:84) ~[reactor-core-3.4.24.jar:3.4.24]
	at reactor.core.scheduler.WorkerTask.call(WorkerTask.java:37) ~[reactor-core-3.4.24.jar:3.4.24]
	at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) ~[na:na]
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:na]
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]
	at java.base/java.lang.Thread.run(Thread.java:842) ~[na:na]

这篇博文，主要通过解决这个异常，来解密Reactive Feign底层调用原理。

二、问题原因分析

上述异常，是使用如下Feign，进行服务调用时，抛出来的。而且服务实例名称为"distribute-sequence"，而不是"192.168.0.101"，而且，这个明明是服务实例的部署地址。

java 复制代码 
@ReactiveFeignClient("distribute-sequence")
public interface DistributeSequenceFeignClient {

    @GetMapping("sequence/distributeSequenceController/id/{number}")
    Mono<Map<String, Object>> createSequenceId(@PathVariable("number") Integer number);
}

那么，就有了一个问题，上述Feign调用时，内部经历了什么，导致服务实例名称，被转换成服务真实地址后，再进行微服务调用？仔细分析一后，大体会形成如下猜想

Feign执行期间，经历两次，首先通过负载均衡算法，获取真实请求地址。也就是将distribute-sequence，得到了192.168.0.101:8081，这个服务实例地址。

然后，在尝试通过192.168.0.101，进行负载均衡算法，获取服务实例。

那么，为什么只需要一次负载均衡算法，就能得到服务实例的地址，在这里，会出现两次？通过阅读代码，发现了如下代码片段（为了不打乱问题分析思路，会在后续博文中，介绍发现过程）

java 复制代码 
// LoadBalancerPublisherClient.java类内容
private final ReactiveLoadBalancer<ServiceInstance> reactiveLoadBalancer;

@Override
public Publisher<Object> executeRequest(ReactiveHttpRequest request) {
    return Mono.from(reactiveLoadBalancer.choose())
            .flatMapMany(serviceInstanceResponse -> {
                URI lbUrl = reconstructURI(serviceInstanceResponse.getServer(), request.uri());
                ReactiveHttpRequest lbRequest = new ReactiveHttpRequest(request, lbUrl);
                return publisherClient.executeRequest(lbRequest);
            });
}

// MonoPublisherHttpClient.java内容
@Override
public Mono<Object> executeRequest(ReactiveHttpRequest request) {
	Mono<ReactiveHttpResponse> response = Mono.defer(() -> reactiveHttpClient.executeRequest(request));
	return response.flatMap(resp -> Mono.from(resp.body()));
}

// WebReactiveHttpClient
private final WebClient webClient;

@Override
public Mono<ReactiveHttpResponse<P>> executeRequest(ReactiveHttpRequest request) {
	return webClient.method(HttpMethod.valueOf(request.method()))
			.uri(request.uri())
			.headers(httpHeaders -> setUpHeaders(request, httpHeaders))
			.body(provideBody(request))
			.exchange()
			.onErrorMap(ex -> {
				Throwable errorMapped = errorMapper.apply(request, ex);
				if(errorMapped != null){
					return errorMapped;
				} else {
					return new ReactiveFeignException(ex, request);
				}
			})
			.map(response -> toReactiveHttpResponse(request, response));
}

上述源码内容，有点跳跃，这里坐下简短介绍。

Feign，基于反射机制，通过LoadBalancerPublisherClient.executeRequest进行请求调用。其内部，先通过ReactiveLoadBalancer，进行负载均衡，选择服务实例。然后，通过WebReactiveHttpClient，进行请求调用，并将响应结果，通过MonoPublisherHttpClient，包装后，返回。

通过观察WebReactiveHttpClient，发现其内部，通过WebClient进行服务请求调用。到这里，上述的问题，就可以解答了。

Reactive，首先选择负载均衡算法，得到服务实例后，在通过WebClient，进行服务请求调用。而在上述配置中，由于LoadBanlanced注解标记的WebClient.Builder，使用了Primary注解标记，导致这里的WebClient，也会进行一次负载均衡算法后，在进行服务调用。从而导致，仅需一次负载均衡算法的服务调用，现在变成了两次，从而出现如上错误。

三、问题解决

通过上述分析，不难发现，第一次reactiveLoadBalancer.choose()负载均衡算法，无法改变。现在只能改变第二次的webclient服务调用，让其在请求调用时，不再负载均衡，那么上述问题，就能迎刃而解。现在只需要，将WebClient.Builder配置，进行一个简单修改，将普通的WebClient.Builder，设置成Primary即可。

java 复制代码 
@Bean
@LoadBalanced
public WebClient.Builder microServiceWebClient() {
    return WebClient.builder();
}

@Bean
@Primary
public WebClient.Builder normalWebClient() {
    return WebClient.builder();
}

总结

Reactive Feign进行请求调用时，其内部，首先通过ReactiveLoadBalancer，选择服务实例，然后，在通过WebClient进行服务调用。那么，针对需要在运行时，才能确定服务调用地址时，那么就不大方便通过Feign定义请求接口。此时，需要借助WebClient，进行服务调用。此时，不配置使用LoadBalanced注解标记的WebClient.Builder，或者将普通的WebClient.Builder Bean，设置为Primary。

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