echo(event: dever.websocket.MessageEvent.Read(message), socket: dever.system.WebSocket) () {
  dever.websocket.send(socket, message)
}

echo(event: dever.websocket.MessageEvent.Failed(message), socket: dever.system.WebSocket) () {
  fail(dever.websocket.MessageEvent.Failed(message))
}

route(request: dever.http.Request, reply: dever.system.HttpReply) () {
  socket = dever.websocket.accept(reply, dever.websocket.defaultLimits())
  each(echo, dever.websocket.messages(socket), socket)
}

serve(listener: dever.system.Listener) () {
  dever.http.serveLive(route, listener, dever.http.defaultLimits(), dever.http.defaultLiveLimits())
}

received(state: dever.websocket.ReceiveState.Read(message)) (answer: Bool) {
  answer = message == dever.websocket.Message.Text("你好")
}

received(state: dever.websocket.ReceiveState.End) (answer: Bool) {
  answer = false
}

verify() (answer: Bool) {
  listener = dever.net.listen("127.0.0.1", 0)
  server = run(serve(listener))
  socket = dever.websocket.connect("127.0.0.1", dever.net.port(listener), "/echo", dever.websocket.defaultLimits())
  dever.websocket.send(socket, dever.websocket.Message.Text("你好"))
  answer = received(dever.websocket.receive(socket))
  dever.net.closeListener(listener)
  dever.websocket.close(socket, 1000, "结束")
  wait(server)
}

opened() (answer: Bool) {
  listener = dever.net.listen("127.0.0.1", 0)
  server = run(serve(listener))
  url = "ws://127.0.0.1:" + int.toText(dever.net.port(listener)) + "/echo"
  socket = dever.websocket.open(url, dever.tls.system(), dever.websocket.defaultLimits())
  dever.websocket.send(socket, dever.websocket.Message.Text("你好"))
  answer = received(dever.websocket.receive(socket))
  dever.websocket.close(socket, 1000, "")
  dever.net.closeListener(listener)
  wait(server)
}

invalid() () {
  socket = dever.websocket.connect("hostname", 80, "/", dever.websocket.defaultLimits())
  dever.websocket.close(socket, 1000, "")
}

sendText(socket: dever.system.WebSocket, text: Text) () {
  dever.websocket.send(socket, dever.websocket.Message.Text(text))
}

sendBinary(socket: dever.system.WebSocket, data: Bytes) () {
  dever.websocket.send(socket, dever.websocket.Message.Binary(data))
}

sendMessage(socket: dever.system.WebSocket, message: dever.websocket.Message) () {
  dever.websocket.send(socket, message)
}