Spring 5 webflux如何在Webclient上设置超时

Question

我正在尝试在我的WebClient上设置超时,这是当前代码:

SslContext sslContext = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();

ClientHttpConnector httpConnector = new ReactorClientHttpConnector(opt -> {
    opt.sslContext(sslContext);
    HttpClientOptions option = HttpClientOptions.builder().build();
    opt.from(option);
});
return WebClient.builder().clientConnector(httpConnector).defaultHeader("Authorization", xxxx)
                .baseUrl(this.opusConfig.getBaseURL()).build();

我需要添加超时和汇集策略,我正在考虑这样的事情:

PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
cm.setMaxTotal(this.applicationConfig.getHttpClientMaxPoolSize());
cm.setDefaultMaxPerRoute(this.applicationConfig.getHttpClientMaxPoolSize());
cm.closeIdleConnections(this.applicationConfig.getServerIdleTimeout(), TimeUnit.MILLISECONDS);

RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(this.applicationConfig.getHttpClientSocketTimeout())
        .setConnectTimeout(this.applicationConfig.getHttpClientConnectTimeout())
        .setConnectionRequestTimeout(this.applicationConfig.getHttpClientRequestTimeout()).build();

CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(requestConfig).setConnectionManager(cm).build();

但我无法弄清楚如何在我的webclient中设置httpClient

Answer 1

要设置读取和连接超时,我使用下面的方法,因为SO_TIMEOUT选项不适用于使用NIO的通道(并给出警告Unknown channel option 'SO_TIMEOUT' for channel '[id: 0xa716fcb2]')

ReactorClientHttpConnector connector = new ReactorClientHttpConnector(
          options -> options.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 2000)
                            .compression(true)
                            .afterNettyContextInit(ctx -> {
                                ctx.addHandlerLast(new ReadTimeoutHandler(5000, TimeUnit.MILLISECONDS));
                            }));
return WebClient.builder()
                .clientConnector(connector)
                .build();

Answer 2

WebFlux WebClient不使用Apache Commons HTTP Client.虽然您可以通过自定义实现一个解决方案ClientHttpConnector.现有的ReactorClientHttpConnector是基于Netty.因此,请考虑使用Netty选项配置客户端,例如:

ReactorClientHttpConnector connector =
            new ReactorClientHttpConnector(options ->
                    options.option(ChannelOption.SO_TIMEOUT, this.applicationConfig.getHttpClientConnectTimeout()));

要么

.onChannelInit(channel -> channel.config().setConnectTimeoutMillis(this.applicationConfig.getHttpClientConnectTimeout()))

UPDATE

我们也可以使用ReadTimeoutHandler:

.onChannelInit(channel -> 
        channel.pipeline()
           .addLast(new ReadTimeoutHandler(this.applicationConfig.getHttpClientConnectTimeout())))

Answer 3

在Spring WebFlux 5.1版本中更改了ReactorClientHttpConnector API .

所以我做了以下(Kotlin语法,基于@joshiste示例):

val tcpClient = TcpClient.create()
    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000)
    .doOnConnected { connection ->
        connection.addHandlerLast(ReadTimeoutHandler(10))
            .addHandlerLast(WriteTimeoutHandler(10))
    }

val myWebClient = webClientBuilder
    .clientConnector(ReactorClientHttpConnector(HttpClient.from(tcpClient)))
    .baseUrl(myEndPoint)
    .build()

Answer 4

随着Spring Webflux的更新，以下是一种适用于Java的解决方案（基于Kotlin 的答案）：

TcpClient timeoutClient = TcpClient.create()
    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, SECONDS*1000)
    .doOnConnected(
        c -> c.addHandlerLast(new ReadTimeoutHandler(SECONDS))
              .addHandlerLast(new WriteTimeoutHandler(SECONDS)));
return webClientBuilder.baseUrl(YOUR_URL)
       .clientConnector(new ReactorClientHttpConnector(HttpClient.from(timeoutClient)))
       .build();