go-websockets-talk/code/main.go

package main

import (
	"fmt"
	"net/http"
	"strconv"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func websocketConnection(w http.ResponseWriter, r *http.Request) {
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		_, _ = fmt.Fprint(w, "You must use the web socket protocol to connect to this endpoint.", err)
		return
	}

	defer ws.Close()

	for {
		_, p, err := ws.ReadMessage()
		if err != nil {
			handleDisconnection(ws)
			break
		}

		msg := string(p)
		handleIncomingMessage(ws, msg)
	}
}

const port = 8080

func main() {
	http.HandleFunc("/websocket", websocketConnection)
	http.Handle("/", http.FileServer(http.Dir("./static")))

	fmt.Println("Chat server opening on port", port)
	err := http.ListenAndServe(":"+strconv.Itoa(port), nil)
	if err != nil {
		_ = fmt.Errorf("Server could not start up: %s", err.Error())
	}
}