Implementing correct Interested/Uninterested behaviour

[bradleyjkemp]

Hi, I'm going to try and add (more) correct interested/uninterested behaviour i.e. only marking a peer as interested if they actually have a piece that we want. Here was my first idea:
In Torrent.prototype._updateInterest, for each wire iterate through their peerPieces bitfield and mark them as interested if they have any piece which we do not currently have.

Is this too inefficient? It would mean #peers * #pieces complexity but from what I can see _updateInterest isn't called very often so this might not be too much of a problem?

[stale]

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