Let users autoseed bittorrent downloads

[calumapplepie]

Some users, myself included, like too seed the files we download from bittorrent. It would be nice if kiwix could provide a UI to let us do this.

I know that this would require changes in the library package as well, and will be filing an issue there, too

[kelson42]

See kiwix/libkiwix#424

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.

[kelson42]

The infrastructure is finally ready for this: we have a working BitTorrent ecosystem with Tracker, superseeder and community ready to seed.

For the moment, The tracker URL is not shared in the Metalink file, but this could be done anytime on-demand. Once that done, aria2c will start immediatly to use BitTorrent for both downloading and uploading. See kiwix/operations#380

Considering that we can allow users to upload their content without having control and information about what is going on, we need to implement this feature first.

Therefor I propose to implement a first version of the feature like following:

• Considering that bootstrapping the download is slower with BitTorrent than with Metalink, we should implement something at the progressbar to make the progressbar progressing a bit during this time (otherwise the user will have the feeling that the download does not start)
• Per default, it should not allow any upload and use BitTorrent only for downloads
• Boolean option "Allow other Kiwix users to copy my books" with the hint "Allow upload of my books via BitTorrent (this is legal)" should be created with following sub-options:
  • Port, should be configured per default to the one used by Aria2c
  • Maximum speed in KB (default should 0 - no limit)
  • A text showing how much data has been share so far.