web seeds support

[mafintosh]

we should support web seed, http://en.wikipedia.org/wiki/BitTorrent#Web_seeding

[BastienClement]

WebSeeding support is not only about the specific technology. It's also integrating a webseed-aware piece selection algorithm, because HTTP servers prefer one big data chunk request that lot of small ones like in torrents.

More specifically, this would mean having an algorithm that try to create large gaps in pieces selection that can be filled by one single HTTP request.

Considering this and the fact that webseeds are not so common (at least in my use-cases), I would say other features like rarest-first piece selection algorithm, code refactoring / modularisation and why not uTP and PEX would be more useful features for now, leading to direct performance enhancement in most cases.

[mafintosh]

@galedric agreed that this is low prio - we should the other things first

[transitive-bullshit]

See also webtorrent/webtorrent#67 for a thorough breakdown of web seeding and to hopefully not duplicate work on this.

Note that a webseed-aware piece selection algorithm is not necessary, but rather a nice-to-have. You could implement web seed peers and no special piece selection handling as a first pass and then implement the special-cased piece selection logic secondly; the existing piece reservation mechanic should work well for this purpose.