func RunTorrents(flags *TorrentFlags, torrentFiles []string) (err error) {
conChan, listenPort, err := ListenForPeerConnections(flags)
if err != nil {
log.Println("Couldn't listen for peers connection: ", err)
return
}
quitChan := listenSigInt()
createChan := make(chan string, flags.MaxActive)
startChan := make(chan *TorrentSession, 1)
doneChan := make(chan *TorrentSession, 1)
var dhtNode dht.DHT
if flags.UseDHT {
dhtNode = *startDHT(flags.Port)
}
torrentSessions := make(map[string]*TorrentSession)
go func() {
for torrentFile := range createChan {
ts, err := NewTorrentSession(flags, torrentFile, uint16(listenPort))
if err != nil {
log.Println("Couldn't create torrent session for "+torrentFile+" .", err)
doneChan <- &TorrentSession{}
} else {
log.Printf("Created torrent session for %s", ts.M.Info.Name)
startChan <- ts
}
}
}()
torrentQueue := []string{}
if len(torrentFiles) > flags.MaxActive {
torrentQueue = torrentFiles[flags.MaxActive:]
}
for i, torrentFile := range torrentFiles {
if i < flags.MaxActive {
createChan <- torrentFile
} else {
break
}
}
lpd := &Announcer{}
if flags.UseLPD {
lpd, err = NewAnnouncer(uint16(listenPort))
if err != nil {
log.Println("Couldn't listen for Local Peer Discoveries: ", err)
flags.UseLPD = false
}
}
theWorldisEnding := false
mainLoop:
for {
select {
case ts := <-startChan:
if !theWorldisEnding {
ts.dht = &dhtNode
if flags.UseLPD {
lpd.Announce(ts.M.InfoHash)
}
torrentSessions[ts.M.InfoHash] = ts
log.Printf("Starting torrent session for %s", ts.M.Info.Name)
go func(t *TorrentSession) {
t.DoTorrent()
doneChan <- t
}(ts)
}
case ts := <-doneChan:
if ts.M != nil {
delete(torrentSessions, ts.M.InfoHash)
if flags.UseLPD {
lpd.StopAnnouncing(ts.M.InfoHash)
}
}
if !theWorldisEnding && len(torrentQueue) > 0 {
createChan <- torrentQueue[0]
torrentQueue = torrentQueue[1:]
continue mainLoop
}
if len(torrentSessions) == 0 {
break mainLoop
}
case <-quitChan:
theWorldisEnding = true
for _, ts := range torrentSessions {
go ts.Quit()
}
case c := <-conChan:
// log.Printf("New bt connection for ih %x", c.Infohash)
if ts, ok := torrentSessions[c.Infohash]; ok {
ts.AcceptNewPeer(c)
}
case dhtPeers := <-dhtNode.PeersRequestResults:
for key, peers := range dhtPeers {
if ts, ok := torrentSessions[string(key)]; ok {
// log.Printf("Received %d DHT peers for torrent session %x\n", len(peers), []byte(key))
for _, peer := range peers {
peer = dht.DecodePeerAddress(peer)
ts.HintNewPeer(peer)
}
} else {
log.Printf("Received DHT peer for an unknown torrent session %x\n", []byte(key))
}
}
case announce := <-lpd.Announces:
hexhash, err := hex.DecodeString(announce.Infohash)
if err != nil {
log.Println("Err with hex-decoding:", err)
}
if ts, ok := torrentSessions[string(hexhash)]; ok {
// log.Printf("Received LPD announce for ih %s", announce.Infohash)
ts.HintNewPeer(announce.Peer)
}
}
}
if flags.UseDHT {
dhtNode.Stop()
}
return
}
