Micronaut ReadTimeoutException

Question

我有一个提供REST API的Grails 4应用程序。其中一个endpoint有时会出现以下异常而失败：

io.micronaut.http.client.exceptions.ReadTimeoutException: Read Timeout
    at io.micronaut.http.client.exceptions.ReadTimeoutException.<clinit>(ReadTimeoutException.java:26)
    at io.micronaut.http.client.DefaultHttpClient$10.exceptionCaught(DefaultHttpClient.java:1917)
    at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:297)
    at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:276)
    at io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:268)
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireExceptionCaught(CombinedChannelDuplexHandler.java:426)
    at io.netty.channel.ChannelHandlerAdapter.exceptionCaught(ChannelHandlerAdapter.java:92)
    at io.netty.channel.CombinedChannelDuplexHandler$1.fireExceptionCaught(CombinedChannelDuplexHandler.java:147)
    at io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:143)
    at io.netty.channel.CombinedChannelDuplexHandler.exceptionCaught(CombinedChannelDuplexHandler.java:233)
    at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:297)
    at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:276)
    at io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:268)
    at io.netty.handler.timeout.ReadTimeoutHandler.readTimedOut(ReadTimeoutHandler.java:98)
    at io.netty.handler.timeout.ReadTimeoutHandler.channelIdle(ReadTimeoutHandler.java:90)
    at io.netty.handler.timeout.IdleStateHandler$ReaderIdleTimeoutTask.run(IdleStateHandler.java:505)
    at io.netty.handler.timeout.IdleStateHandler$AbstractIdleTask.run(IdleStateHandler.java:477)
    at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38)
    at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:127)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:405)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:834)

endpoint使用micronaut http客户端调用其他系统。远程系统需要很长时间才能响应，导致ReadTimeOutException。

以下是调用远程服务的代码：

class RemoteTaskService implements GrailsConfigurationAware {

    String taskStepperUrl

    // initializes fields from configuration
    void setConfiguration(Config config) {
        taskStepperUrl = config.getProperty('services.stepper')
    }

    private BlockingHttpClient getTaskClient() {
        HttpClient.create(taskStepperUrl.toURL()).toBlocking()
    }

    List<Map> loadTasksByProject(long projectId) {
        try {
            retrieveRemoteList("/api/tasks?projectId=${projectId}")
        } catch(HttpClientResponseException e) {
            log.error("Loading tasks of project failed with status: ${e.status.code}: ${e.message}")
            throw new NotFoundException("No tasks found for project ${projectId}")
        }
    }

    private List<Map> retrieveRemoteList(String path) {
        HttpRequest request = HttpRequest.GET(path)
        HttpResponse<List> response = taskClient.exchange(request, List) as HttpResponse<List>
        response.body()
    }
}

我尝试在application.yml中使用以下配置解决它：

micronaut:
    server:
        read-timeout: 30

和

micronaut.http.client.read-timeout: 30

...没有成功。尽管我进行了配置，但在调用endpoint后10秒左右仍然会发生超时。

如何更改超文本传输协议其余客户端的读取超时持续时间？

Answer 1

在我的例子中，我是从一个客户端流式传输一个文件

java prettyprint-override">  @Get(value = "${service-path}", processes = APPLICATION_OCTET_STREAM)
  Flowable<byte[]> fullImportStream();

所以当我得到这个时，我的第一个冲动是增加读取超时值。但是，对于流式传输场景，应用的属性是文档中所述的读取空闲超时时间https://docs.micronaut.io/latest/guide/configurationreference.html#io.micronaut.http.client.DefaultHttpClientConfiguration

Answer 2

配置值似乎没有注入到手动创建的http客户端中。

解决方案是在创建时配置HttpClient，设置readTimeout持续时间：

private BlockingHttpClient getTaskClient() {
    HttpClientConfiguration configuration = new DefaultHttpClientConfiguration()
    configuration.readTimeout = Duration.ofSeconds(30)
    new DefaultHttpClient(taskStepperUrl.toURL(), configuration).toBlocking()
}

Answer 3

micronaut.http.client.read-timeout需要持续时间，所以您应该在值中添加一个测量单位，如30，30m或30h。