chore: change C.PacketAdapter from a struct to an interface

constant/listener.go

@@ -16,26 +16,8 @@ type AdvanceListener interface {
 
 type NewListener interface {
 	Name() string
-	ReCreate(tcpIn chan<- ConnContext,udpIn chan<-*PacketAdapter) error
+	ReCreate(tcpIn chan<- ConnContext, udpIn chan<- PacketAdapter) error
 	Close() error
 	Address() string
 	RawAddress() string
 }
-
-// PacketAdapter is a UDP Packet adapter for socks/redir/tun
-type PacketAdapter struct {
-	UDPPacket
-	metadata *Metadata
-}
-
-func NewPacketAdapter(udppacket UDPPacket,metadata *Metadata)*PacketAdapter{
-return &PacketAdapter{
-	udppacket,
-	metadata,
-}
-}
-
-// Metadata returns destination metadata
-func (s *PacketAdapter) Metadata() *Metadata {
-	return s.metadata
-}