func (t *Torrent) SetMaxEstablishedConns(max int) (oldMax int) {
t.cl.mu.Lock()
defer t.cl.mu.Unlock()
oldMax = t.maxEstablishedConns
t.maxEstablishedConns = max
wcs := slices.HeapInterface(append([]*connection(nil), t.conns...), worseConn)
for len(t.conns) > t.maxEstablishedConns && wcs.Len() > 0 {
t.dropConnection(wcs.Pop().(*connection))
}
t.openNewConns()
return oldMax
}
// The worst connection is one that hasn't been sent, or sent anything useful
// for the longest. A bad connection is one that usually sends us unwanted
// pieces, or has been in worser half of the established connections for more
// than a minute.
func (t *Torrent) worstBadConn() *connection {
wcs := slices.HeapInterface(t.worstUnclosedConns(), worseConn)
for wcs.Len() != 0 {
c := heap.Pop(wcs).(*connection)
if c.UnwantedChunksReceived >= 6 && c.UnwantedChunksReceived > c.UsefulChunksReceived {
return c
}
if wcs.Len() >= (t.maxEstablishedConns+1)/2 {
// Give connections 1 minute to prove themselves.
if time.Since(c.completedHandshake) > time.Minute {
return c
}
}
}
return nil
}