add cache for groups and clients, http sending message remains to be add

main.go

@@ -10,10 +10,12 @@ func main() {
 	InitDatabase(context.Background())
 	srv := &wsServer{
 		OnOpen: func(c *Client) {
+			AddOrUpdateConnectedClientToCache(&mu, c)
 			log.Println("client connected")
 		},
 		OnClose: func(c *Client, err error) {
 			log.Println("client disconnected:", err)
+			RemoveConnectedClientFromCache(&mu, c)
 		},
 		OnMessage: func(c *Client, msg map[string]any) {
 			log.Printf("received: %v\n", msg)
@@ -27,8 +29,10 @@ func main() {
 
 	http.Handle("/ws", srv)
 	log.Println("server listening on :8080")
-	http.HandleFunc("POST /register", RegisterHandler)
-	http.HandleFunc("POST /login", LoginHandler)
-	http.HandleFunc("POST /create/group", CreateGroupHandler)
+	http.HandleFunc("POST /new/account", RegisterHandler)
+	http.HandleFunc("POST /new/token", LoginHandler)
+	http.HandleFunc("POST /new/group", CreateGroupHandler)
+	http.HandleFunc("POST /new/messageto/{groupid}", SendMessageHandler)
+
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }