Introduce Packet to unify TCP and UDP communication

common/net/packet.go

@@ -0,0 +1,53 @@
+package net
+
+type Packet interface {
+	Destination() Destination
+	Chunk() []byte // First chunk of this commnunication
+	MoreChunks() bool
+}
+
+func NewTCPPacket(dest Destination) *TCPPacket {
+	return &TCPPacket{
+		basePacket: basePacket{destination: dest},
+	}
+}
+
+func NewUDPPacket(dest Destination, data []byte) *UDPPacket {
+	return &UDPPacket{
+		basePacket: basePacket{destination: dest},
+		data:       data,
+	}
+}
+
+type basePacket struct {
+	destination Destination
+}
+
+func (base basePacket) Destination() Destination {
+	return base.destination
+}
+
+type TCPPacket struct {
+	basePacket
+}
+
+func (packet *TCPPacket) Chunk() []byte {
+	return nil
+}
+
+func (packet *TCPPacket) MoreChunks() bool {
+	return true
+}
+
+type UDPPacket struct {
+	basePacket
+	data []byte
+}
+
+func (packet *UDPPacket) Chunk() []byte {
+	return packet.data
+}
+
+func (packet *UDPPacket) MoreChunks() bool {
+	return false
+}