Albirew/nyaa-pantsu
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nyaa-pantsu/service/scraper/scraper.go

209 lignes
4,3 Kio
Go
Brut Vue normale Historique

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package scraperService
import (
"github.com/ewhal/nyaa/config"
"github.com/ewhal/nyaa/db"
"github.com/ewhal/nyaa/model"
"github.com/ewhal/nyaa/util/log"
"net"
"net/url"
"time"
)
// MTU yes this is the ipv6 mtu
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const MTU = 1500
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// max number of scrapes per packet
const ScrapesPerPacket = 74
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// bittorrent scraper
type Scraper struct {
done chan int
sendQueue chan *SendEvent
recvQueue chan *RecvEvent
errQueue chan error
trackers map[string]*Bucket
ticker *time.Ticker
cleanup *time.Ticker
interval time.Duration
PacketsPerSecond uint
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}
func New(conf *config.ScraperConfig) (sc *Scraper, err error) {
sc = &Scraper{
done: make(chan int),
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sendQueue: make(chan *SendEvent, 1024),
recvQueue: make(chan *RecvEvent, 1024),
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errQueue: make(chan error),
trackers: make(map[string]*Bucket),
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ticker: time.NewTicker(time.Second),
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interval: time.Second * time.Duration(conf.IntervalSeconds),
cleanup: time.NewTicker(time.Second),
}
if sc.PacketsPerSecond == 0 {
sc.PacketsPerSecond = 10
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}
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for idx := range conf.Trackers {
err = sc.AddTracker(&conf.Trackers[idx])
if err != nil {
break
}
}
return
}
func (sc *Scraper) AddTracker(conf *config.ScrapeConfig) (err error) {
var u *url.URL
u, err = url.Parse(conf.URL)
if err == nil {
var ips []net.IP
ips, err = net.LookupIP(u.Hostname())
if err == nil {
// TODO: use more than 1 ip ?
addr := &net.UDPAddr{
IP: ips[0],
}
addr.Port, err = net.LookupPort("udp", u.Port())
if err == nil {
sc.trackers[addr.String()] = NewBucket(addr)
}
}
}
return
}
func (sc *Scraper) Close() (err error) {
close(sc.sendQueue)
close(sc.recvQueue)
close(sc.errQueue)
sc.ticker.Stop()
sc.done <- 1
return
}
func (sc *Scraper) runRecv(pc net.PacketConn) {
for {
var buff [MTU]byte
n, from, err := pc.ReadFrom(buff[:])
if err == nil {
log.Debugf("got %d from %s", n, from)
sc.recvQueue <- &RecvEvent{
From: from,
Data: buff[:n],
}
} else {
sc.errQueue <- err
}
}
}
func (sc *Scraper) runSend(pc net.PacketConn) {
for {
ev, ok := <-sc.sendQueue
if !ok {
return
}
log.Debugf("write %d to %s", len(ev.Data), ev.To)
pc.WriteTo(ev.Data, ev.To)
}
}
func (sc *Scraper) RunWorker(pc net.PacketConn) (err error) {
go sc.runRecv(pc)
go sc.runSend(pc)
for {
var bucket *Bucket
ev, ok := <-sc.recvQueue
if !ok {
break
}
tid, err := ev.TID()
action, err := ev.Action()
log.Debugf("transaction = %d action = %d", tid, action)
if err == nil {
bucket, ok = sc.trackers[ev.From.String()]
if ok && bucket != nil {
bucket.VisitTransaction(tid, func(t *Transaction) {
if t == nil {
log.Warnf("no transaction %d", tid)
} else {
if t.GotData(ev.Data) {
err := t.Sync()
if err != nil {
log.Warnf("failed to sync swarm: %s", err)
}
t.Done()
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log.Debugf("transaction %d done", tid)
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} else {
sc.sendQueue <- t.SendEvent(ev.From)
}
}
})
} else {
log.Warnf("bucket not found for %s", ev.From)
}
}
}
return
}
func (sc *Scraper) Run() {
for {
select {
case <-sc.ticker.C:
sc.Scrape(sc.PacketsPerSecond)
break
case <-sc.cleanup.C:
sc.removeStale()
break
}
}
}
func (sc *Scraper) removeStale() {
for k := range sc.trackers {
sc.trackers[k].ForEachTransaction(func(tid uint32, t *Transaction) {
if t == nil || t.IsTimedOut() {
sc.trackers[k].Forget(tid)
}
})
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}
}
func (sc *Scraper) Scrape(packets uint) {
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now := time.Now().Add(0 - sc.interval)
// only scrape torretns uploaded within 90 days
oldest := now.Add(0 - (time.Hour * 24 * 90))
rows, err := db.ORM.Raw("SELECT torrent_id, torrent_hash FROM torrents WHERE last_scrape IS NULL OR last_scrape < ? AND date > ? ORDER BY torrent_id DESC LIMIT ?", now, oldest, packets*ScrapesPerPacket).Rows()
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if err == nil {
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counter := 0
var scrape [ScrapesPerPacket]model.Torrent
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for rows.Next() {
idx := counter % ScrapesPerPacket
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rows.Scan(&scrape[idx].ID, &scrape[idx].Hash)
counter++
if idx == 0 {
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for _, b := range sc.trackers {
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t := b.NewTransaction(scrape[:])
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sc.sendQueue <- t.SendEvent(b.Addr)
}
}
}
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rows.Close()
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} else {
log.Warnf("failed to select torrents for scrape: %s", err)
}
}
func (sc *Scraper) Wait() {
<-sc.done
}