check versions

cart-packet-queue.go

@@ -12,6 +12,8 @@ type CartPacketQueue struct {
 	expectedPackages map[uint32]*CartListener
 }
 
+const CurrentPacketVersion = 2
+
 type CartListener map[CartId]chan []byte
 
 func NewCartPacketQueue(connection net.Conn) *CartPacketQueue {
@@ -36,6 +38,14 @@ func (p *CartPacketQueue) HandleConnection(connection net.Conn) error {
 			log.Printf("Error receiving packet: %v\n", err)
 			return err
 		}
+		if packet.Version != CurrentPacketVersion {
+			log.Printf("Error receiving packet: %v\n", err)
+			continue
+		}
+		if packet.DataLength == 0 {
+			go p.HandleData(packet.MessageType, packet.Id, []byte{})
+			continue
+		}
 		data, err := GetPacketData(connection, packet.DataLength)
 		if err != nil {
 			log.Printf("Error receiving packet data: %v\n", err)