BitTorrent client in Go

Initially based off of a blog post from Jesse Li to implement the [OG BitTorrent protocol][BEP0003].

Public Domain (aka Legal) Torrents for Testing

• Ubuntu Server LTS via torrent
  • single file torrent
• [NASA Torrents][nasa-torrents], in particular these images from the Mars Viking Orbiter.
  • multi-file torrent
  • magnet link as well

Supports

• Original Spec ([BEP0003][])
  • Multi-file .torrent files
  • Original and Compact Peer List formats ([BEP0023][])

TODO

• Implement ‘endgame mode’ as described in [BEP0003][] for downloading the last few pieces
• Seeding in OG .torrent protocol
• Magnet links - might go w/ udp trackers
  • UDP Trackers ([BEP0015][])
    • can acquire a list of peers (ip & port) from a UDP tracker url
  • UDP Extensions ([BEP0041][])
  • Extension to download metadata from peers ([BEP0009][])
• DHT
• PEX
• Fast Extension ([BEP0006][])
• Announce list - i.e. Multitracker Metadata Extension ([BEP0012])
• uTorrent Transport Protocol ([BEP0029][])
• Some pretty terminal visual of pieces being downloaded?

[BEP0003]: http://bittorrent.org/beps/bep_0003.html ‘original bittorrent spec’
[BEP0015]: http://bittorrent.org/beps/bep_0015.html ‘UDP Trackers’
[BEP0009]: http://bittorrent.org/beps/bep_0009.html ‘Extension for Peers to Send Metadata Files’
[BEP0041]: http://bittorrent.org/beps/bep_0041.html ‘UDP Extensions’
[BEP0012]: http://bittorrent.org/beps/bep_0012.html ‘Multitracker Metadata Extension’
[nasa-torrents]: https://academictorrents.com/collection/nasa-datasets ‘Archives of NASA torrents’

[BEP0023]: http://bittorrent.org/beps/bep_0023.html ‘Compact Peer Lists’
[BEP0006]: http://bittorrent.org/beps/bep_0006.html ‘Fast Extension’
[BEP0029]: http://bittorrent.org/beps/bep_0029.html ‘uTorrent Transport Protocol’