https://github.com/jakkusakura/comp4621-protocol

An application-level reliable network protocol upon UDP, a final project of COMP4721
https://github.com/jakkusakura/comp4621-protocol

Last synced: 13 days ago
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An application-level reliable network protocol upon UDP, a final project of COMP4721

• Host: GitHub
• URL: https://github.com/jakkusakura/comp4621-protocol
• Owner: JakkuSakura
• License: mit
• Created: 2020-09-10T06:32:35.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-11-06T14:32:45.000Z (about 4 years ago)
• Last Synced: 2023-11-25T05:21:23.471Z (about 1 year ago)
• Language: Python
• Size: 654 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# 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

## Protocol

### Data Types

`int` 4 bytes, big endian

`data` 4 + n bytes, first 4 byte is its pure data length

### Packets

Packet

```

int seq_num

int ack_num

int chk_sum

data payload

```

 

## Architecture

- 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