Question

升级到Web套接字在播放框架中是抽象的。如何手动实现？

我使用播放框架创建了一个Web套接字应用程序。我可以在Web套接字客户端和服务器（已创建）之间建立连接但是升级到Web套接字已由play-framework抽象化了。

def chatSystem(): WebSocket = WebSocket.acceptOrResult[String, String] { request =>
    Future.successful{
      AuthenticationService.doBasicAuthentication(request.headers) match {
        case Results.Ok => Right(ActorFlow.actorRef { out => ChatServiceActor.props(out) })
        case _ => Left(Unauthorized)
      }
    }
  }

URL : ws://localhost:9000/chatSystem/test123

在建立连接之前，我需要做以下事情，

如果Websocket服务器无法识别URL路径中的userId，则它应发送状态为404的HTTP响应并中止WebSocket连接

如果Websocket服务器不同意使用客户机提供的子协议之一，则它必须完成不带Sec-WebSocket-Protocol标头的响应的Web套接字握手，然后立即关闭WebSocket连接。

>

我不确定如何手动执行逻辑，以便将升级响应发送到客户端，然后建立Web套接字连接。

Answer 1

遗憾的是，我认为这是不可能的，我能够检测到WebSocket是Handler，并且玩游戏期望实现路由的方法返回Handler，所以，从理论上讲，如果您可以构建一个返回Handler的方法，该方法是将RequestHeader转换为另一个Handler（例如trait CustomHandler extends (RequestHeader => Handler) with Handler）的函数，那么您将能够创建一个实例来检查是否应该建立Web套接字连接。

但是，如果这样做，则在发出请求时会出现异常，希望我缺少一个关键细节，我建议在他们的github上打开一个票证：

我的堆栈跟踪是：

akka.http.impl.util.One2OneBidiFlow$OutputTruncationException: Inner flow was completed without producing result elements for 1 outstanding elements
    at akka.http.impl.util.One2OneBidiFlow$OutputTruncationException$.apply(One2OneBidiFlow.scala:22)
    at akka.http.impl.util.One2OneBidiFlow$OutputTruncationException$.apply(One2OneBidiFlow.scala:22)
    at akka.http.impl.util.One2OneBidiFlow$One2OneBidi$$anon$1$$anon$4.onUpstreamFinish(One2OneBidiFlow.scala:97)
    at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:504)
    at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:378)
    at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:588)
    at akka.stream.impl.fusing.GraphInterpreterShell$AsyncInput.execute(ActorGraphInterpreter.scala:472)
    at akka.stream.impl.fusing.GraphInterpreterShell.processEvent(ActorGraphInterpreter.scala:563)
    at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:745)
    at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:760)
    at akka.actor.Actor.aroundReceive(Actor.scala:517)
    at akka.actor.Actor.aroundReceive$(Actor.scala:515)
    at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:670)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:588)
    at akka.actor.ActorCell.invoke(ActorCell.scala:557)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
    at akka.dispatch.Mailbox.run(Mailbox.scala:225)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
    at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
akka.http.impl.util.One2OneBidiFlow$OutputTruncationException: Inner flow was completed without producing result elements for 1 outstanding elements
    at akka.http.impl.util.One2OneBidiFlow$OutputTruncationException$.apply(One2OneBidiFlow.scala:22)
    at akka.http.impl.util.One2OneBidiFlow$OutputTruncationException$.apply(One2OneBidiFlow.scala:22)
    at akka.http.impl.util.One2OneBidiFlow$One2OneBidi$$anon$1$$anon$4.onUpstreamFinish(One2OneBidiFlow.scala:97)
    at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:504)
    at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:378)
    at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:588)
    at akka.stream.impl.fusing.GraphInterpreterShell$AsyncInput.execute(ActorGraphInterpreter.scala:472)
    at akka.stream.impl.fusing.GraphInterpreterShell.processEvent(ActorGraphInterpreter.scala:563)
    at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:745)
    at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:760)

Play Framework-手动升级到Web套接字

1 个答案: