http.Handle("/", websocket.Handler(EchoServer) Can EchoServer Get another parameter other than ws?
go, websocket
Solution
I assume what you want here is a consistent `string` parameter that is returned for all connections to /. There are a couple of approaches I've used. (None of these specific code samples have been tested; I can pull some real code if they don't compile.)
One is to let the data be the receiver. I use this a most often with a struct, but any parameter will do. This only works for a single parameter (but you could of course put multiple parameters in a struct). I like this approach when the parameter is "object like." (Generally a struct that has other methods on it.)
type echoStuff string
var hey echoStuff = "Hey!"
http.Handle("/", websocket.Handler(hey.EchoServer))
err := http.ListenAndServe(":8081", nil)
CheckError(err)
func (msg echoStuff) Echoserver(ws *websocket.Conn) {
fmt.Println("Client Connected")
_ := websocket.JSON.Send(ws, msg);
}
Another way is with a closure. I like this approach when the parameter is "data like." (Something like a string or other simple data. Note how this approach doesn't require creating a local type.)
func WebSocketServer() {
http.Handle("/", echoHandler("Hey!"))
err := http.ListenAndServe(":8081", nil)
CheckError(err)
}
func echoHandler(msg string) websocket.Handler {
return func(ws *Conn) {
Echoserver(ws, msg)
}
}
Problem
I have opened a websocket server to send data to web component, ``` func WebSocketServer() { http.Handle("/", websocket.Handler(Echoserver)) err := http.ListenAndServe(":8081", nil) CheckError(err) } ``` I would like to pass an additionnal argument (msg, of type String) to the handlerfunction (Echoserver). ``` func Echoserver(ws *websocket.Conn, msg String) { fmt.Println("Client Connected") _ := websocket.JSON.Send(ws, msg); } } ``` Is it possible to do this with the syntax above? How do you call Echoserver with the additionnal parameter ?