11 "github.com/anacrolix/dht/krpc"
12 "github.com/anacrolix/torrent/tracker"
15 // Announces a torrent to a tracker at regular intervals, when peers are
17 type trackerScraper struct {
20 lastAnnounce trackerAnnounceResult
23 func (ts *trackerScraper) statusLine() string {
25 fmt.Fprintf(&w, "%q\t%s\t%s",
28 na := time.Until(ts.lastAnnounce.Completed.Add(ts.lastAnnounce.Interval))
38 if ts.lastAnnounce.Err != nil {
39 return ts.lastAnnounce.Err.Error()
41 if ts.lastAnnounce.Completed.IsZero() {
44 return fmt.Sprintf("%d peers", ts.lastAnnounce.NumPeers)
50 type trackerAnnounceResult struct {
53 Interval time.Duration
57 func (me *trackerScraper) getIp() (ip net.IP, err error) {
58 ips, err := net.LookupIP(me.u.Hostname())
63 err = errors.New("no ips")
66 for _, ip = range ips {
67 if me.t.cl.ipIsBlocked(ip) {
82 err = errors.New("no acceptable ips")
86 func (me *trackerScraper) trackerUrl(ip net.IP) string {
89 u.Host = net.JoinHostPort(ip.String(), u.Port())
94 // Return how long to wait before trying again. For most errors, we return 5
95 // minutes, a relatively quick turn around for DNS changes.
96 func (me *trackerScraper) announce(event tracker.AnnounceEvent) (ret trackerAnnounceResult) {
98 ret.Completed = time.Now()
100 ret.Interval = 5 * time.Minute
101 ip, err := me.getIp()
103 ret.Err = fmt.Errorf("error getting ip: %s", err)
107 req := me.t.announceRequest(event)
109 //log.Printf("announcing %s %s to %q", me.t, req.Event, me.u.String())
110 res, err := tracker.Announce{
111 HTTPProxy: me.t.cl.config.HTTPProxy,
112 UserAgent: me.t.cl.config.HTTPUserAgent,
113 TrackerUrl: me.trackerUrl(ip),
115 HostHeader: me.u.Host,
116 ServerName: me.u.Hostname(),
117 UdpNetwork: me.u.Scheme,
118 ClientIp4: krpc.NodeAddr{IP: me.t.cl.config.PublicIp4},
119 ClientIp6: krpc.NodeAddr{IP: me.t.cl.config.PublicIp6},
122 ret.Err = fmt.Errorf("error announcing: %s", err)
125 me.t.AddPeers(Peers(nil).AppendFromTracker(res.Peers))
126 ret.NumPeers = len(res.Peers)
127 ret.Interval = time.Duration(res.Interval) * time.Second
131 func (me *trackerScraper) Run() {
132 defer me.announceStopped()
133 // make sure first announce is a "started"
137 // after first announce, get back to regular "none"
144 interval := ar.Interval
145 if interval < time.Minute {
146 interval = time.Minute
148 wantPeers := me.t.wantPeersEvent.LockedChan(me.t.cl.locker())
151 if interval > time.Minute {
152 interval = time.Minute
159 case <-me.t.closed.LockedChan(me.t.cl.locker()):
163 case <-time.After(time.Until(ar.Completed.Add(interval))):
168 func (me *trackerScraper) announceStopped() {
169 me.announce(tracker.Stopped)