package main
import (
"log"
"net/http"
"github.com/gorilla/websocket"
)
var clients = make(map[*websocket.Conn]bool) // connected clients
var broadcast = make(chan Message) // broadcast channel
// Configure the upgrader
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
}
// Define our message object
type Message struct {
Email string `json:"email"`
Username string `json:"username"`
Message string `json:"message"`
}
func main() {
// Create a simple file server
fs := http.FileServer(http.Dir("../public"))
http.Handle("/", fs)
// Configure websocket route
http.HandleFunc("/ws", handleConnections)
// Start listening for incoming chat messages
go handleMessages()
// Start the server on localhost port 8000 and log any errors
log.Println("http server started on :8000")
err := http.ListenAndServe(":8000", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
}
func handleConnections(w http.ResponseWriter, r *http.Request) {
// Upgrade initial GET request to a websocket
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Fatal(err)
}
// Make sure we close the connection when the function returns
defer ws.Close()
// Register our new client
clients[ws] = true
for {
var msg Message
// Read in a new message as JSON and map it to a Message object
err := ws.ReadJSON(&msg)
if err != nil {
log.Printf("error: %v", err)
delete(clients, ws)
break
}
// Send the newly received message to the broadcast channel
broadcast <- msg
}
}
func handleMessages() {
for {
// Grab the next message from the broadcast channel
msg := <-broadcast
// Send it out to every client that is currently connected
for client := range clients {
err := client.WriteJSON(msg)
if err != nil {
log.Printf("error: %v", err)
client.Close()
delete(clients, client)
}
}
}
}