akka-http：带有流程的完整请求 [英] akka-http: complete request with flow

问题描述

假设我已经建立了一个任意复杂的 Flow [HttpRequest，HttpResponse，Unit] 。

Assume I have set up an arbitrarily complex Flow[HttpRequest, HttpResponse, Unit].

我已经可以使用上述流程来处理传入请求了

I can already use said flow to handle incoming requests with

Http().bindAndHandle(flow, "0.0.0.0", 8080)

现在我想利用现有指令（例如 logRequestResult（ my-service）{...}
）添加日志记录？我想我正在寻找另一个指令，类似于

Now I would like to add logging, leveraging some existing directive, like logRequestResult("my-service"){...} Is there a way to combine this directive with my flow? I guess I am looking for another directive, something along the lines of

def completeWithFlow(flow: Flow): Route

这可能吗？

NB：logRequestResult是一个例子，我的问题适用于任何可能有用的指令。

N.B.: logRequestResult is an example, my question applies to any Directive one might find useful.

推荐答案

提出一种（也许是唯一的）方法连接和实现新流程，并将提取的请求提供给它。下面的示例

Turns out one (and maybe the only) way is to wire and materialize a new flow, and feed the extracted request to it. Example below

  val myFlow: Flow[HttpRequest, HttpResponse, NotUsed] = ???

  val route =
    get {
      logRequestResult("my-service") {
        extract(_.request) { req ⇒
          val futureResponse = Source.single(req).via(myFlow).runWith(Sink.head)
          complete(futureResponse)
        }
      }
    }

  Http().bindAndHandle(route, "127.0.0.1", 9000)

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