Spring集成Webflux异常处理

如果在spring集成webflux流中发生异常,异常本身(带有stacktrace)将通过MessagePublishingErrorHandler作为有效负载发送回调用方,它使用来自“errorChannel”头的错误通道,而不是默认的错误通道。

如何设置类似的错误处理程序 WebExceptionHandler ? 我想生成一个Http状态码,可能还有一个 DefaultErrorAttributes

简单地定义一个从 errorChannel fluxErrorChannel ,但它似乎也没有用作错误通道,错误不会在我的 errorFlow :

@Bean
public IntegrationFlow fooRestFlow() {
    return IntegrationFlows.from(
            WebFlux.inboundGateway("/foo")
                    .requestMapping(r -> r.methods(HttpMethod.POST))
                    .requestPayloadType(Map.class)
                    .errorChannel(fluxErrorChannel()))
            .channel(bazFlow().getInputChannel())
            .get();
}

@Bean
public MessageChannel fluxErrorChannel() {
    return MessageChannels.flux().get();
}

@Bean
public IntegrationFlow errorFlow() {
    return IntegrationFlows.from(fluxErrorChannel())
            .transform(source -> source)
            .enrichHeaders(h -> h.header(HttpHeaders.STATUS_CODE, HttpStatus.BAD_GATEWAY))
            .get();
}

@Bean
public IntegrationFlow bazFlow() {
    return f -> f.split(Map.class, map -> map.get("items"))
            .channel(MessageChannels.flux())
            .<String>handle((p, h) -> throw new RuntimeException())
            .aggregate();
}

更新

MessagingGatewaySupport.doSendAndReceiveMessageReactive 在WebFlux.inboundGateway上定义的错误通道从不用于设置错误通道,而错误通道始终是 replyChannel 正在创建的 here :

FutureReplyChannel replyChannel = new FutureReplyChannel();

Message<?> requestMessage = MutableMessageBuilder.fromMessage(message)
    .setReplyChannel(replyChannel)
    .setHeader(this.messagingTemplate.getSendTimeoutHeader(), null)
    .setHeader(this.messagingTemplate.getReceiveTimeoutHeader(), null)
    .setErrorChannel(replyChannel)
    .build();

originalErrorChannelHandler 在里面 Mono.fromFuture ,但在我的例子中,错误通道是空的。此外,还有 onErrorResume

return Mono.fromFuture(replyChannel.messageFuture)
    .doOnSubscribe(s -> {
        if (!error && this.countsEnabled) {
            this.messageCount.incrementAndGet();
        }
    })
    .<Message<?>>map(replyMessage ->
        MessageBuilder.fromMessage(replyMessage)
            .setHeader(MessageHeaders.REPLY_CHANNEL, originalReplyChannelHeader)
            .setHeader(MessageHeaders.ERROR_CHANNEL, originalErrorChannelHeader)
            .build())
    .onErrorResume(t -> error ? Mono.error(t) : handleSendError(requestMessage, t));

这是如何运作的?