gorrent

Features

• Single-file torrent download
• UDP & HTTP trackers
• Uploading pieces
• DHT, PeX and Magnet links

How it Works

1. Peers discovery
   1. parse a .torrent file
   2. retrieve peers info(i.e. IP, port) from UDP/HTTP trackers
2. Download from peers
   1. start a TCP connection
   2. complete BitTorrent peer protocol handshake
   3. exchange messages
      • interpreting different types of messages
      • manage concurrency & state
      • pipelining requests
   4. assemble data

References

• BEP-3: The BitTorrent Protocol Specification
• Bittorrent Protocol Specification v1.0
• A toy torrent client written in golang
• Building a BitTorrent client from the ground up in Go
• BEP-15: UDP Tracker Protocol for BitTorrent
• BitTorrent’s Future: DHT, PEX, and Magnet Links Explained