你能刷新或重新显示未刷新的telnet输入吗?

时间:2015-01-17 22:52:38

标签: scala telnet tcpserver akka-io

我正在写一个基于旧学校文本的telnet服务器,现在是Scala的一个美化聊天室,基于Akka actor的IO。发生的事情是客户端客户端将开始输入内容然后事件将发生,当它被写入时,它会清除已经输入的任何内容。在下面的示例中,Tom已经开始输入“say你好吗?”但弗雷德在他只输入了“说如何”之后就到了,这个输入就被消灭了:

Tom > say How ar
Fred has arrived.
Tom > 

有没有办法让telnet重新显示它还没有刷新的输出缓冲区呢?

这是服务器:

class TcpServer(port: Int) extends Actor {
  import TcpServer._
  import context.system

  val log = Logging(system, this)
  var connectionNum: Int = 1

  log.info(STARTING_SERVER)

  IO(Tcp) ! Bind(self, new InetSocketAddress("0.0.0.0", port))

  def receive = {
    case b @ Bound(localAddress) =>
      log.info(PORT_BOUND, localAddress)
    case c @ Connected(remote, local) =>
      log.info(CONNECTION_ACCEPTED)
      context.actorOf(ConnectionHandler.connectionProps(sender()), s"conn$connectionNum")
      connectionNum += 1
    case CommandFailed(_: Bind) =>
      log.error(BINDING_FAILED)
      context stop self
  }
}

这是ConnectionHandler,它的伴随对象,以及它使用的消息案例类:

class ConnectionHandler(connection: ActorRef) extends Actor {
  import context._

  val log = Logging(context.system, this)

  connection ! Register(self)

  var delegate = actorOf(Props[LoginHandler], "login")
  watch(delegate)

  def receive = {
    case Received(data) =>
      val dataString = data.utf8String.trim
      log.info("Received data from connection: {}", dataString)
      delegate ! Input(dataString)

    case Output(content) =>
      connection ! Write(ByteString(content))

    case LoggedIn(user) =>
      unwatch(delegate)
      delegate ! PoisonPill

      delegate = actorOf(UserHandler.connectionProps(user), user.name.toLowerCase)
      watch(delegate)

    case Terminated =>
      log.warning("User delegate died unexpectedly.")
      connection ! ConfirmedClose

    case CloseConnection(message) =>
      connection ! Write(ByteString(message + "\n"))
      connection ! ConfirmedClose
      log.info("User quit.")

    case ConfirmedClosed =>
      log.info("Connection closed.")
      stop(self)

    case PeerClosed =>
      log.info("Connection closed by client.")
      stop(self)
  }
}

object ConnectionHandler {
  def connectionProps(connection: ActorRef): Props = Props(new ConnectionHandler(connection))
}

case class Input(input: String)
case class Output(output: String)
case class LoggedIn(user: User)
case class CloseConnection(message: String)

1 个答案:

答案 0 :(得分:0)

好的,在最终正确地表达我的谷歌查询之后,我发现了我需要的东西: Force telnet client into character mode

基本的解决方案是我在一个时间模式下强迫客户进入角色,并回复我关心的角色。这样做的好处是,现在我可以完成标签完成,命令历史记录,并且不会显示密码。

以下是相关的代码段:

val controlString = ByteString('\u00ff','\u00fb','\u0001','\u00ff','\u00fb','\u0003','\u00ff','\u00fc','\u0022')

connection ! Write(controlString)