COMP4621-Protocol

An application-level reliable network protocol upon UDP, a final project of COMP4721

Functionalities

Reliable data transfer(both sender side and receiver side): resistant to disordering, packet loss and corruption.
Batch ACK
Basic timeout and retransmit
0RTT Handshaking

int 4 bytes, big endian data 4 + n bytes, first 4 byte is its pure data length

Packet

int seq_num
int ack_num
int chk_sum
data payload

adaptors.py: interface Socket and its implementations like DebugSocket(prints received and sent data), DropoutSocket(drops packets randomly), CorruptedSocket(shuffles individual packets probabilistically), ArraySocket(for manually construct packets), DisorderSocket(shuffle packets probabilistically), and UdtAdaptor(utilizes udt.py here)
tools.py: some tools, including ByteBuf and print_info(print with mutex for testing)
packet.py: packet format
protocol.py: core code is implemented here. It should be rdt.py but I finished it before rdt.py template was released. I am too lazy to rename it.
receiver.py
sender.py
udt.py