simble.go

func wsHandler(w http.ResponseWriter, r *http.Request) {
	conn, err := upgrader.Upgrade(w, r, nil)
	logFatalError(err)

	clients[conn] = redisClient.Subscribe(*channelName)
	n, err := redisClient.Publish(*channelName, "x").Result()
	browsers := strconv.FormatInt(n, 10)

	for client := range clients {
		logFatalError(err)

		err = client.WriteMessage(websocket.TextMessage, []byte(browsers))
		if err != nil {
			log.Println("client gone")
			delete(clients, client)
		}
	}
}