Update echo.go

app/echo.go

@@ -1,11 +1,24 @@
 package main
 
 import (
+	"fmt"
+	"time"
 	"net/http"
 
 	"github.com/gorilla/websocket"
 )
 
+var upgrader = websocket.Upgrader{
+    ReadBufferSize:  1024,
+    WriteBufferSize: 1024,
+    CheckOrigin: func(r *http.Request) bool {
+		if r.Header.Get("origin") == "https://statbate.com" {
+			return true
+		}
+		return false
+	},
+}
+
 var (
 	wsClients = make(map[*websocket.Conn]struct{})
 
@@ -13,37 +26,68 @@ var (
 		Count chan int
 		Send  chan []byte
 		Add   chan *websocket.Conn
+		Del   chan *websocket.Conn
 	}{
 		Count: make(chan int, 100),
 		Send:  make(chan []byte, 100),
 		Add:   make(chan *websocket.Conn, 100),
+		Del:   make(chan *websocket.Conn, 100),
 	}
 )
 
 func broadcast() {
+	ticker := time.NewTicker(30 * time.Second)
 	for {
 		select {
 		case conn := <-ws.Add:
 			wsClients[conn] = struct{}{}
 
+		case conn := <-ws.Del:
+			delete(wsClients, conn)
+
 		case <-ws.Count:
 			ws.Count <- len(wsClients)
 
 		case message := <-ws.Send:
-			for conn := range wsClients {
-				if err := conn.WriteMessage(1, message); err != nil {
-					conn.Close()
-					delete(wsClients, conn)
-				}
-			}
+			sendMessage(message)				
+			
+		case <-ticker.C:
+			sendMessage([]byte("ping"))
+		}
+	}
+}
+
+func sendMessage(message []byte) {
+	for conn := range wsClients {
+		if err := conn.WriteMessage(1, message); err != nil {
+			conn.Close()
+			delete(wsClients, conn)
 		}
 	}
 }
 
 func wsHandler(w http.ResponseWriter, r *http.Request) {
-	conn, err := websocket.Upgrade(w, r, w.Header(), 1024, 1024)
+	conn, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
 		return
 	}
-	ws.Add <- conn
+	go readWS(conn)
+}
+
+func readWS(conn *websocket.Conn) {
+	defer conn.Close()
+	
+	ws.Add <- conn
+	
+	defer func() {
+		ws.Del <- conn
+	}()
+	
+	for {
+		_, _, err := conn.ReadMessage()
+		if err != nil {
+			fmt.Println("readWS", err.Error())
+			return
+		}
+	}
 }