问题
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
回答1:
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
}))
回答2:
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.
来源:https://stackoverflow.com/questions/55750947/websockets-over-webassembly-generated-by-golang