extension support

[madd512]

I made this thing support extensions. Thoughts?

[feross]

Yes, this is good idea. Without this, the only way to use a custom protocol extension is to send a PR to webtorrent core, or to use bittorrent-protocol directly and build your own client.

However, I'd rather emit 'wire' as an event than pass it in as an option to the WebTorrent constructor, because we currently don't have any on* style options – those are all events. I'll make this change to your PR.

Eventually, we might want to add an extensions option to the constructor to make it easier than:

var MyExtension = require('./my-extension')

torrent.on('wire', function (wire) {
  wire.use(MyExtension)
})

[feross]

Released as 0.50.0.

[madd512]

👍

I wasn't super happy with the onWire option. I was thinking maybe client.use(Extension) but this works too.