go websocket example

go-websocket.go

package main

import (
	"log"
	"net/http"

	"github.com/gorilla/mux"
	"github.com/gorilla/websocket"
)

var clients = make(map[*websocket.Conn]bool)

var upgrader = websocket.Upgrader{
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

func main() {
	router := mux.NewRouter()
	router.HandleFunc("/ws", wsHandler)

	log.Fatal(http.ListenAndServe(":8000", router))
}

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

	if err != nil {
		log.Fatal(err)
	}

	// register client
	clients[ws] = true
	log.Println(len(clients))
}