长生不老药凤凰频道

问题描述

我是elixir和phoenix的新手，正在尝试使用phoenix后端和js前端来设置频道。我已经设置了频道，但收到了重复发生的Ranch侦听器错误（反复出现相同的错误循环）。

[info] CONNECTED TO SenseiWeb.UserSocket in 138µs
  Transport: :websocket
  Serializer: Phoenix.socket.V2.JSONSerializer
  Parameters: %{"vsn" => "2.0.0"}
[error] Ranch listener SenseiWeb.Endpoint.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.519.0> exit with reason: {:undef,[{SenseiWeb.SymbolChannel,:child_spec,[{SenseiWeb.Endpoint,{#PID<0.519.0>,#Reference<0.1115078885.25165827.139445>}}],[]},{Phoenix.Channel.Server,:join,4,[file: 'lib/phoenix/channel/server.ex',line: 25]},{Phoenix.socket,:handle_in,[file: 'lib/phoenix/socket.ex',line: 617]},{Phoenix.Endpoint.Cowboy2Handler,:websocket_handle,2,[file: 'lib/phoenix/endpoint/cowboy2_handler.ex',line: 175]},{:cowboy_websocket,:handler_call,6,[file: '/Users/ndshah82/projects/sensei-Trader-elixir/deps/cowboy/src/cowboy_websocket.erl',line: 528]},{:cowboy_http,:loop,1,[file: '/Users/ndshah82/projects/sensei-Trader-elixir/deps/cowboy/src/cowboy_http.erl',line: 254]},{:proc_lib,:init_p_do_apply,3,[file: 'proc_lib.erl',line: 226]}]}

defmodule SenseiWeb.UserSocket do
  use Phoenix.socket

  channel "symbols:*",SenseiWeb.SymbolChannel
  @impl true
  def connect(_params,socket,_connect_info) do
    {:ok,assign(socket,:user_id,1)}
  end

  @impl true
  def id(socket),do: "users_socket:#{socket.assigns.user_id}"
end

defmodule SenseiWeb.SymbolChartsChannel do
  use SenseiWeb,:channel

  def join("symbols:charts",_params,socket) do
    {:ok,socket}
  end

  def handle_info("update_symbols",socket) do
    push(socket,"ping",%{count: 1})
    { :noreply,:count,1) }
  end

  def handle_in("update_symbols",_,"update_symbols",%{val: 1})
    {:noreply,socket}
  end
end

const Symbol = {
  init(socket,addSymbolButton) {
    if(!addSymbolButton) {
      return
    }

    const channel = socket.channel("symbols:charts",{abc: 1})

    channel.on("update_symbols",resp => console.log(resp))

    channel.join()
      .receive("ok",({messages}) => console.log("catching up",messages) )
      .receive("error",({reason}) => console.log("Failed join",reason) )
      .receive("timeout",() => console.log("Networking issue. Still waiting..."))
}

解决方法

在您的SenseiWeb.UserSocket中，该语句

channel "symbols:*",SenseiWeb.SymbolChannel

应该是

channel "symbols:*",SenseiWeb.SymbolChartsChannel

顺便说一句，错误原因

{:undef,[{SenseiWeb.SymbolChannel,:child_spec,...}]}

告诉您“模块” SenseiWeb.SymbolChannel（仅是原子:"Elixir.SenseiWeb.SymbolChannel"）没有名为:child_spec的功能。您要么忘记在频道模块中添加行use SenseiWeb,:channel（不是您的情况），要么SenseiWeb.SymbolChannel本身不是模块。