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Springboot v2.0.0.M6 WebClient进行多次重复的HTTP POST调用

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我使用的是spring-boot版本2.0.0.M6 . 我需要从spring-boot应用程序发出异步HTTP调用说APP1到另一个应用程序（播放框架）说APP2 . 因此，如果我需要从APP1到APP2进行20次不同的异步调用，APP2会收到20个请求，其中很少是重复请求，这意味着这些重复请求替换了几个不同的请求 . 预期：

api/v1/call/1
api/v1/call/2
api/v1/call/3
api/v1/call/4

实际：

api/v1/call/1
api/v1/call/2
api/v1/call/4
api/v1/call/4

我正在使用Spring反应式WebClient .

下面是build.gradle中的spring boot版本

buildscript {
ext {
    springBootVersion = '2.0.0.M6'
    //springBootVersion = '2.0.0.BUILD-SNAPSHOT'
}
repositories {
    mavenCentral()
    maven { url "https://repo.spring.io/snapshot" }
    maven { url "https://repo.spring.io/milestone" }
    maven {url "https://plugins.gradle.org/m2/"}
}
dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    classpath("se.transmode.gradle:gradle-docker:1.2")


}
}

我的WebClient init片段

private WebClient webClient = WebClient.builder()
        .clientConnector(new ReactorClientHttpConnector((HttpClientOptions.Builder builder) -> builder.disablePool()))
        .build();

我的POST方法

public <T> Mono<JsonNode> postClient(String url, T postData) {
    return Mono.subscriberContext().flatMap(ctx -> {
        String cookieString = ctx.getOrDefault(Constants.SubscriberContextConstnats.COOKIES, StringUtils.EMPTY);
        URI uri = URI.create(url);
        return webClient.post().uri(uri).body(BodyInserters.fromObject(postData)).header(HttpHeaders.COOKIE, cookieString)
          .exchange().flatMap(clientResponse ->
          {
              return clientResponse.bodyToMono(JsonNode.class);
          })
         .onErrorMap(err -> new TurtleException(err.getMessage(), err))
         .doOnSuccess(jsonData -> {
         });
    });
}

调用此postClient方法的代码

private void getResultByKey(PremiumRequestHandler request, String key, BrokerConfig brokerConfig) {

    /* Live calls for the insurers */
    LOG.info("[PREMIUM SERVICE] LIVE CALLLLL MADE FOR: " + key + " AND REQUEST ID: " + request.getRequestId());

    String uri = brokerConfig.getHostUrl() + verticalResolver.determineResultUrl(request.getVertical()) + key;
    LOG.info("[PREMIUM SERVICE] LIVE CALL WITH URI : " + uri + " FOR REQUEST ID: " + request.getRequestId());
    Mono<PremiumResponse> premiumResponse = reactiveWebClient.postClient(uri, request.getPremiumRequest())
            .map(json -> PlatformUtils.mapToClass(json, PremiumResponse.class));

    premiumResponse.subscribe(resp -> {
        resp.getPremiumResults().forEach(result -> {
            LOG.info("Key " + result.getKey());

            repository.getResultRepoRawType(request.getVertical())
                    .save(result).subscribe();
            saveResult.subscriberContext(ctx -> {

                MultiBrokerMongoDBFactory.setDatabaseNameForCurrentThread(brokerConfig.getBroker());
                return ctx;
            }).subscribe();
        });
    }, error -> {
        LOG.info("[PREMIUM SERVICE] ERROR RECIEVED FOR " + key + " AND REQUEST ID" + request.getRequestId() + " > " + error.getMessage());
    });

}

如果将日志放在客户端代码的终点，则无法在该点看到多个请求 .

可能是WebClient中的一个错误，其中URI在多线程环境中被交换 .

尝试改变WebClient，仍然会交换URI

请帮忙 .

Git Repo添加github.com/praveenk007/ps-demo

java spring-boot spring-webflux

1 回答

  • 0

    加上我的一些观察：

    webClient.get() 或 webClient.post() 总是在每次调用 URI 的调用时返回新 DefaultRequestBodyUriSpec ，我认为它看起来不像 URI 被交换 .

    class DefaultWebClient implements WebClient {

..
    @Override
    public RequestHeadersUriSpec<?> get() {
        return methodInternal(HttpMethod.GET);
    }
    @Override
    public RequestBodyUriSpec post() {
        return methodInternal(HttpMethod.POST);
    }


..


    @Override
    public Mono<ClientResponse> exchange() {
        ClientRequest request = (this.inserter != null ?
                initRequestBuilder().body(this.inserter).build() :
                initRequestBuilder().build());
        return exchangeFunction.exchange(request).switchIfEmpty(NO_HTTP_CLIENT_RESPONSE_ERROR);
    }

    private ClientRequest.Builder initRequestBuilder() {
        URI uri = (this.uri != null ? this.uri : uriBuilderFactory.expand(""));
        return ClientRequest.create(this.httpMethod, uri)
                .headers(headers -> headers.addAll(initHeaders()))
                .cookies(cookies -> cookies.addAll(initCookies()))
                .attributes(attributes -> attributes.putAll(this.attributes));
    }
..
}

    和 methodInternal 方法如下所示

    @SuppressWarnings("unchecked")
private RequestBodyUriSpec methodInternal(HttpMethod httpMethod) {
    return new DefaultRequestBodyUriSpec(httpMethod);
}

    此外，在同时发出实际请求时，会创建新的 ClientRequest .

    类来源

    https://github.com/spring-projects/spring-framework/blob/master/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClient.java

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