如何在phoenix中从websocket传输中获取客户端数据(IP、主机名)？

defmodule MyApp.Websocket do
  use GenServer

  def start_link() do
    GenServer.start_link(__MODULE__, [])
  end

  def init(state) do
    {:ok, state}
  end

  def handle_info({:websocket, conn, message}, state) do
    ip = Phoenix.Endpoint.remote_ip(conn)
    host = Phoenix.Endpoint.remote_host(conn)

    # 在这里可以对接收到的消息进行处理
    # ...

    {:noreply, state}
  end
end

defmodule MyAppWeb do
  # ...

  def socket("/socket", _params) do
    {:ok, _, socket} = MyApp.Websocket.start_link()
    {:ok, socket}
  end

  # ...
end

let socket = new WebSocket("ws://localhost:4000/socket");

socket.onopen = function(event) {
  // 连接成功后发送数据
  socket.send("Hello, Phoenix!");
};

socket.onmessage = function(event) {
  // 处理接收到的消息
  console.log(event.data);
};

socket.onclose = function(event) {
  // 连接关闭时的处理
};