How to non-blockingly listen to a server-side websocket in Go

Question content

I use https://pkg.go.dev/golang.org/x/net/websocket to create a server-side websocket. All communication through it is in json format. So my code contains:

func wsHandler(ws *websocket.Conn) {
    var evnt event
    websocket.JSON.Receive(ws, &evnt)
    …

However, this blocks until the client closes the connection. I know this websocket package predates context (and I know there are newer websocket packages), but still - is there really no way to wait for incoming frames in a non-blocking way?

Correct answer

This blocks until the client closes the connection.

The easiest way to handle concurrent blocking operations is to give them a goroutine. Goroutines, unlike processes or threads, are essentially "free".

func wsHandler(ws *websocket.Conn) {
    go func() {
      var evnt event
      websocket.JSON.Receive(ws, &evnt)
      ....
   }()
}

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