11 "github.com/anacrolix/dht/v2/krpc"
13 "github.com/anacrolix/torrent/tracker"
16 // Announces a torrent to a tracker at regular intervals, when peers are
18 type trackerScraper struct {
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)
51 type trackerAnnounceResult struct {
54 Interval time.Duration
58 func (me *trackerScraper) getIp() (ip net.IP, err error) {
59 ips, err := net.LookupIP(me.u.Hostname())
64 err = errors.New("no ips")
67 for _, ip = range ips {
68 if me.t.cl.ipIsBlocked(ip) {
83 err = errors.New("no acceptable ips")
87 func (me *trackerScraper) trackerUrl(ip net.IP) string {
90 u.Host = net.JoinHostPort(ip.String(), u.Port())
95 // Return how long to wait before trying again. For most errors, we return 5
96 // minutes, a relatively quick turn around for DNS changes.
97 func (me *trackerScraper) announce(event tracker.AnnounceEvent) (ret trackerAnnounceResult) {
99 ret.Completed = time.Now()
101 ret.Interval = 5 * time.Minute
102 ip, err := me.getIp()
104 ret.Err = fmt.Errorf("error getting ip: %s", err)
108 req := me.t.announceRequest(event)
110 //log.Printf("announcing %s %s to %q", me.t, req.Event, me.u.String())
111 res, err := tracker.Announce{
112 HTTPProxy: me.t.cl.config.HTTPProxy,
113 UserAgent: me.t.cl.config.HTTPUserAgent,
114 TrackerUrl: me.trackerUrl(ip),
116 HostHeader: me.u.Host,
117 ServerName: me.u.Hostname(),
118 UdpNetwork: me.u.Scheme,
119 ClientIp4: krpc.NodeAddr{IP: me.t.cl.config.PublicIp4},
120 ClientIp6: krpc.NodeAddr{IP: me.t.cl.config.PublicIp6},
123 ret.Err = fmt.Errorf("error announcing: %s", err)
126 me.t.AddPeers(Peers(nil).AppendFromTracker(res.Peers))
127 ret.NumPeers = len(res.Peers)
128 ret.Interval = time.Duration(res.Interval) * time.Second
132 func (me *trackerScraper) Run() {
133 defer me.announceStopped()
134 // make sure first announce is a "started"
138 // after first announce, get back to regular "none"
145 interval := ar.Interval
146 if interval < time.Minute {
147 interval = time.Minute
149 wantPeers := me.t.wantPeersEvent.LockedChan(me.t.cl.locker())
152 if interval > time.Minute {
153 interval = time.Minute
160 case <-me.t.closed.LockedChan(me.t.cl.locker()):
164 case <-time.After(time.Until(ar.Completed.Add(interval))):
169 func (me *trackerScraper) announceStopped() {
170 me.announce(tracker.Stopped)