通过golang在WebAssembly上的Websocket？

问题描述：

Is it possible to write a Websocket client in wasm over go? I have tried using gorilla/websocket, but no success:

func main() {
    ws := func(this js.Value, inputs []js.Value) interface{} {
        go func() {
            wsDial, r, err := websocket.DefaultDialer.Dial("ws://localhost:3000/ws", nil)
            fmt.Println(wsDial, r, err)
        }()
        return nil
    }

    js.Global().Set("ws", js.FuncOf(ws))

    select {}
}

I get the following error when calling ws():

dial tcp: Protocol not available

是否可以在wasm over上编写Websocket客户端？我尝试使用gorilla / websocket code>，但没有成功： p>

  func main（）{
 ws：= func（this js.Value， 输入[] js.Value）接口{} {
 go func（）{
 wsDial，r，err：= websocket.DefaultDialer.Dial（“ ws：// localhost：3000 / ws”，nil）
 fmt  .Println（wsDial，r，err）
}（）
返回nil 
} 
 
 js.Global（）。Set（“ ws”，js.FuncOf（ws））
 
选择{  } 
} 
  code>  pre> 
 
 调用 ws（） code>时收到以下错误： p> 
 
 
  拨号tcp：协议不可用
  code>  pre> 
  div>

答

I have solved it by retrieving the WebSocket object from the global JavaScript object, which in my case is window because I am running this in a browser. I have used only the "syscall/js" library. It looks like this:

ws := js.Global().Get("WebSocket").New("ws://localhost:8080/ws")

ws.Call("addEventListener", "open", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
    fmt.Println("open")

    ws.Call("send", js.TypedArrayOf([]byte{123}))
    return nil
}))

答

Have a look at the gopherJS websocket library. This one was created to run in the browser (originally js).

I recently saw a youtube video with it being in use in WASM but I couldn't find it any more.

通过golang在WebAssembly上的Websocket？

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