Akka文件上传 - 在收到请求结束前发送2xx'早期'响应

Question

我知道这个问题已在这里提出，但我没有找到任何解决问题的方法。始终保持此警告：在收到请求结束前发送2xx'早期'响应。

这是我的代码：

pathPrefix("upload") {
  (post & extractRequest) { _ => {
    extractRequestContext {
      requestCtx => {
        println(requestCtx.request.toString)
        implicit val materializer = requestCtx.materializer
        implicit val executionContext = requestCtx.executionContext
        fileUpload("file") {
          case (metadata, byteSource) => {

            val completesOnceUploadCompleted: Future[Done] =
              byteSource.runWith(FileIO.toPath(Paths.get(metadata.fileName))).map(
                iores => iores.status.get
              )

            val futureResponseBody = completesOnceUploadCompleted.map(res => res)
            complete(futureResponseBody)
          }
        }
      }
    }
  }

  }
}

请帮我修理一下。

Answer 1

我不确定潜在问题的原因。但是，一个“快速修复”是使用onComplete指令等待写入完成：

pathPrefix("upload") {
  post {    
    extractRequestContext { requestCtx => 
      println(requestCtx.request.toString)
      implicit val materializer = requestCtx.materializer
      implicit val executionContext = requestCtx.executionContext

      fileUpload("file") { (metadata, byteSource) =>

        val writeFileFut : Future[Try[Done]] = 
          byteSource.runWith(FileIO.toPath(Paths.get(metadata.fileName)))
                    .map(_.status)

        onComplete(writeFileFut) {
          case Success(statusTry) => statusTry match {
            case Success(done) => complete(StatusCodes.Ok)
            case Failure(ex) => complete(StatusCodes.InternalServerError -> ex.toString)
          }
          case Failure(ex) => complete(StatusCodes.InternalServerError -> ex.toString)
        }
      }
    }
  }
}