9 "github.com/anacrolix/missinggo"
11 "github.com/anacrolix/torrent/tracker"
14 // Announces a torrent to a tracker at regular intervals, when peers are
16 type trackerScraper struct {
18 // Causes the trackerScraper to stop running.
21 lastAnnounce trackerAnnounceResult
24 func (ts *trackerScraper) statusLine() string {
26 fmt.Fprintf(&w, "%q\t%s\t%s",
29 na := time.Until(ts.lastAnnounce.Completed.Add(ts.lastAnnounce.Interval))
39 if ts.lastAnnounce.Err != nil {
40 return ts.lastAnnounce.Err.Error()
42 if ts.lastAnnounce.Completed.IsZero() {
45 return fmt.Sprintf("%d peers", ts.lastAnnounce.NumPeers)
50 type trackerAnnounceResult struct {
53 Interval time.Duration
57 func trackerToTorrentPeers(ps []tracker.Peer) (ret []Peer) {
58 ret = make([]Peer, 0, len(ps))
59 for _, p := range ps {
60 ret = append(ret, Peer{
63 Source: peerSourceTracker,
69 // Return how long to wait before trying again. For most errors, we return 5
70 // minutes, a relatively quick turn around for DNS changes.
71 func (me *trackerScraper) announce() (ret trackerAnnounceResult) {
73 ret.Completed = time.Now()
75 ret.Interval = 5 * time.Minute
76 blocked, urlToUse, host, err := me.t.cl.prepareTrackerAnnounceUnlocked(me.url)
82 ret.Err = errors.New("blocked by IP")
86 req := me.t.announceRequest()
88 res, err := tracker.AnnounceHost(urlToUse, &req, host)
93 me.t.AddPeers(trackerToTorrentPeers(res.Peers))
94 ret.NumPeers = len(res.Peers)
95 ret.Interval = time.Duration(res.Interval) * time.Second
99 func (me *trackerScraper) Run() {
102 case <-me.t.closed.LockedChan(&me.t.cl.mu):
104 case <-me.stop.LockedChan(&me.t.cl.mu):
106 case <-me.t.wantPeersEvent.LockedChan(&me.t.cl.mu):
114 intervalChan := time.After(ar.Completed.Add(ar.Interval).Sub(time.Now()))
117 case <-me.t.closed.LockedChan(&me.t.cl.mu):
119 case <-me.stop.LockedChan(&me.t.cl.mu):