11 "github.com/anacrolix/dht/v2/krpc"
12 "github.com/anacrolix/log"
14 "github.com/anacrolix/torrent/tracker"
17 // Announces a torrent to a tracker at regular intervals, when peers are
19 type trackerScraper struct {
22 lastAnnounce trackerAnnounceResult
25 type torrentTrackerAnnouncer interface {
30 func (me trackerScraper) URL() url.URL {
34 func (ts *trackerScraper) statusLine() string {
36 fmt.Fprintf(&w, "%q\t%s\t%s",
39 na := time.Until(ts.lastAnnounce.Completed.Add(ts.lastAnnounce.Interval))
49 if ts.lastAnnounce.Err != nil {
50 return ts.lastAnnounce.Err.Error()
52 if ts.lastAnnounce.Completed.IsZero() {
55 return fmt.Sprintf("%d peers", ts.lastAnnounce.NumPeers)
61 type trackerAnnounceResult struct {
64 Interval time.Duration
68 func (me *trackerScraper) getIp() (ip net.IP, err error) {
69 ips, err := net.LookupIP(me.u.Hostname())
74 err = errors.New("no ips")
77 for _, ip = range ips {
78 if me.t.cl.ipIsBlocked(ip) {
93 err = errors.New("no acceptable ips")
97 func (me *trackerScraper) trackerUrl(ip net.IP) string {
100 u.Host = net.JoinHostPort(ip.String(), u.Port())
105 // Return how long to wait before trying again. For most errors, we return 5
106 // minutes, a relatively quick turn around for DNS changes.
107 func (me *trackerScraper) announce(event tracker.AnnounceEvent) (ret trackerAnnounceResult) {
109 ret.Completed = time.Now()
111 ret.Interval = time.Minute
112 ip, err := me.getIp()
114 ret.Err = fmt.Errorf("error getting ip: %s", err)
118 req := me.t.announceRequest(event)
120 me.t.logger.WithValues(log.Debug).Printf("announcing to %q: %#v", me.u.String(), req)
121 res, err := tracker.Announce{
122 HTTPProxy: me.t.cl.config.HTTPProxy,
123 UserAgent: me.t.cl.config.HTTPUserAgent,
124 TrackerUrl: me.trackerUrl(ip),
126 HostHeader: me.u.Host,
127 ServerName: me.u.Hostname(),
128 UdpNetwork: me.u.Scheme,
129 ClientIp4: krpc.NodeAddr{IP: me.t.cl.config.PublicIp4},
130 ClientIp6: krpc.NodeAddr{IP: me.t.cl.config.PublicIp6},
133 ret.Err = fmt.Errorf("error announcing: %s", err)
136 me.t.AddPeers(Peers(nil).AppendFromTracker(res.Peers))
137 ret.NumPeers = len(res.Peers)
138 ret.Interval = time.Duration(res.Interval) * time.Second
142 func (me *trackerScraper) Run() {
143 defer me.announceStopped()
144 // make sure first announce is a "started"
148 // after first announce, get back to regular "none"
155 // Make sure we don't announce for at least a minute since the last one.
156 interval := ar.Interval
157 if interval < time.Minute {
158 interval = time.Minute
162 wantPeers := me.t.wantPeersEvent.C()
163 closed := me.t.closed.C()
166 // If we want peers, reduce the interval to the minimum.
169 if interval > time.Minute {
170 interval = time.Minute
172 // Now we're at the minimum, don't trigger on it anymore.
181 // Recalculate the interval.
183 case <-time.After(time.Until(ar.Completed.Add(interval))):
188 func (me *trackerScraper) announceStopped() {
189 me.announce(tracker.Stopped)