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tracker_scraper.go
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tracker_scraper.go
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package torrent
import (
"bytes"
"errors"
"fmt"
"net"
"net/url"
"time"
"github.com/anacrolix/dht/v2/krpc"
"github.com/anacrolix/log"
"github.com/anacrolix/missinggo"
"github.com/anacrolix/torrent/tracker"
)
// Announces a torrent to a tracker at regular intervals, when peers are
// required.
type trackerScraper struct {
u url.URL
// Causes the trackerScraper to stop running.
stop missinggo.Event
t *Torrent
lastAnnounce trackerAnnounceResult
}
func (ts *trackerScraper) statusLine() string {
var w bytes.Buffer
fmt.Fprintf(&w, "%q\t%s\t%s",
ts.u.String(),
func() string {
na := time.Until(ts.lastAnnounce.Completed.Add(ts.lastAnnounce.Interval))
if na > 0 {
na /= time.Second
na *= time.Second
return na.String()
} else {
return "anytime"
}
}(),
func() string {
if ts.lastAnnounce.Err != nil {
return ts.lastAnnounce.Err.Error()
}
if ts.lastAnnounce.Completed.IsZero() {
return "never"
}
return fmt.Sprintf("%d peers", ts.lastAnnounce.NumPeers)
}(),
)
return w.String()
}
type trackerAnnounceResult struct {
Err error
NumPeers int
Interval time.Duration
Completed time.Time
}
func (me *trackerScraper) getIp() (ip net.IP, err error) {
ips, err := net.LookupIP(me.u.Hostname())
if err != nil {
return
}
if len(ips) == 0 {
err = errors.New("no ips")
return
}
for _, ip = range ips {
if me.t.cl.ipIsBlocked(ip) {
continue
}
switch me.u.Scheme {
case "udp4":
if ip.To4() == nil {
continue
}
case "udp6":
if ip.To4() != nil {
continue
}
}
return
}
err = errors.New("no acceptable ips")
return
}
func (me *trackerScraper) trackerUrl(ip net.IP) string {
u := me.u
if u.Port() != "" {
u.Host = net.JoinHostPort(ip.String(), u.Port())
}
return u.String()
}
// Return how long to wait before trying again. For most errors, we return 5
// minutes, a relatively quick turn around for DNS changes.
func (me *trackerScraper) announce() (ret trackerAnnounceResult) {
defer func() {
ret.Completed = time.Now()
}()
ret.Interval = 5 * time.Minute
ip, err := me.getIp()
if err != nil {
ret.Err = fmt.Errorf("error getting ip: %s", err)
return
}
me.t.cl.lock()
req := me.t.announceRequest()
me.t.cl.unlock()
me.t.logger.WithDefaultLevel(log.Debug).Printf("announcing to %q: %#v", me.u.String(), req)
res, err := tracker.Announce{
HTTPProxy: me.t.cl.config.HTTPProxy,
UserAgent: me.t.cl.config.HTTPUserAgent,
TrackerUrl: me.trackerUrl(ip),
Request: req,
HostHeader: me.u.Host,
ServerName: me.u.Hostname(),
UdpNetwork: me.u.Scheme,
ClientIp4: krpc.NodeAddr{IP: me.t.cl.config.PublicIp4},
ClientIp6: krpc.NodeAddr{IP: me.t.cl.config.PublicIp6},
}.Do()
me.t.logger.WithDefaultLevel(log.Debug).Printf("announce to %q returned %#v: %v", me.u.String(), res, err)
if err != nil {
ret.Err = fmt.Errorf("error announcing: %s", err)
return
}
me.t.AddPeers(Peers(nil).AppendFromTracker(res.Peers))
ret.NumPeers = len(res.Peers)
ret.Interval = time.Duration(res.Interval) * time.Second
return
}
func (me *trackerScraper) Run() {
for {
ar := me.announce()
me.t.cl.lock()
me.lastAnnounce = ar
me.t.cl.unlock()
wait:
interval := ar.Interval
if interval < time.Minute {
interval = time.Minute
}
wantPeers := me.t.wantPeersEvent.LockedChan(me.t.cl.locker())
select {
case <-wantPeers:
if interval > time.Minute {
interval = time.Minute
}
wantPeers = nil
default:
}
select {
case <-me.t.closed.LockedChan(me.t.cl.locker()):
return
case <-me.stop.LockedChan(me.t.cl.locker()):
return
case <-wantPeers:
goto wait
case <-time.After(time.Until(ar.Completed.Add(interval))):
}
}
}