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tracker.go
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/
tracker.go
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package main
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"log"
"math/rand"
"net"
"net/url"
"os"
"strconv"
"time"
)
import "github.com/fzzy/radix/redis"
import "github.com/stathat/go"
const ACTION_CONNECT = 0
const ACTION_ANNOUNCE = 1
const ACTION_SCRAPE = 2
const ACTION_ERROR = 3
const EVENT_NONE = 0
const EVENT_COMPLETED = 1
const EVENT_STARTED = 2
const EVENT_STOPPED = 3
type tracker struct {
url *url.URL
conn *net.UDPConn
connID uint64
maxPeerCount int
}
type trackerResponse struct {
FailureReason string `bencode:"failure reason"`
WarningMessage string `bencode:"warning message"`
Interval uint
MinInterval uint `bencode:"min interval"`
TrackerId string `bencode:"tracker id"`
Complete uint
Incomplete uint
Peers string
Peers6 string
}
func NewTracker(urlStr string, maxPeerCount int) (*tracker, error) {
t := new(tracker)
url, err := url.Parse(urlStr)
if err != nil {
return nil, err
}
t.url = url
t.maxPeerCount = maxPeerCount
return t, nil
}
func (t *tracker) query(infoHashStr string) (*trackerResponse, error) {
switch t.url.Scheme {
case "udp":
return t.scrapeUDP(infoHashStr)
default:
errorMessage := fmt.Sprintf(
"Unknown scheme %v in %v",
t.url.Scheme,
t.url.String(),
)
// log.Println(errorMessage)
return nil, errors.New(errorMessage)
}
}
func (t *tracker) scrapeUDP(infoHashStr string) (*trackerResponse, error) {
serverAddr, err := net.ResolveUDPAddr("udp", t.url.Host)
if err != nil {
return nil, err
}
conn, err := net.DialUDP("udp", nil, serverAddr)
if err != nil {
return nil, err
}
t.conn = conn
defer func() { t.conn.Close() }()
err = t.conn.SetDeadline(time.Now().Add(UDP_TIMEOUT * time.Second))
if err != nil {
return nil, err
}
err = t.connectUDP()
if err != nil {
return nil, err
}
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
return nil, nerr
}
if err != nil {
return nil, err
}
return t.getUDPScrapeResponse(infoHashStr)
}
func (t *tracker) connectUDP() error {
var connReq_connID uint64 = 0x41727101980
var action uint32 = 0
transactionID := rand.Uint32()
connReq := new(bytes.Buffer)
err := binary.Write(connReq, binary.BigEndian, connReq_connID)
if err != nil {
return err
}
err = binary.Write(connReq, binary.BigEndian, action)
if err != nil {
return err
}
err = binary.Write(connReq, binary.BigEndian, transactionID)
if err != nil {
return err
}
_, err = t.conn.Write(connReq.Bytes())
if err != nil {
return err
}
connectionResponseBytes := make([]byte, 16)
var connRespLen int
connRespLen, err = t.conn.Read(connectionResponseBytes)
if err != nil {
return err
}
if connRespLen != 16 {
err = fmt.Errorf("Unexpected response size %d", connRespLen)
return err
}
connResp := bytes.NewBuffer(connectionResponseBytes)
var connRespAction uint32
err = binary.Read(connResp, binary.BigEndian, &connRespAction)
if err != nil {
return err
}
if connRespAction != ACTION_CONNECT {
err = fmt.Errorf("Unexpected response action %d", connRespAction)
return err
}
var connRespTransID uint32
err = binary.Read(connResp, binary.BigEndian, &connRespTransID)
if err != nil {
return err
}
if connRespTransID != transactionID {
return fmt.Errorf(
"Unexpected response transactionID %x != %x",
connRespTransID,
transactionID,
)
}
err = binary.Read(connResp, binary.BigEndian, &t.connID)
if err != nil {
return err
}
return err
}
func (t *tracker) getUDPScrapeResponse(infoHashStr string) (
*trackerResponse,
error,
) {
scrapeRequest := new(bytes.Buffer)
// Connection ID
err := binary.Write(scrapeRequest, binary.BigEndian, t.connID)
if err != nil {
return nil, err
}
// Action
var action uint32 = ACTION_ANNOUNCE
err = binary.Write(scrapeRequest, binary.BigEndian, action)
if err != nil {
return nil, err
}
// Transaction ID
transactionID := rand.Uint32()
err = binary.Write(scrapeRequest, binary.BigEndian, transactionID)
if err != nil {
return nil, err
}
// Info hash
infoHashBytes, _ := hex.DecodeString(infoHashStr)
err = binary.Write(scrapeRequest, binary.BigEndian, infoHashBytes)
if err != nil {
return nil, err
}
// Peer ID
peerId := "-tt" + strconv.Itoa(os.Getpid()) + "_" +
strconv.FormatInt(rand.Int63(), 10)
peerId = peerId[0:20]
err = binary.Write(scrapeRequest, binary.BigEndian, []byte(peerId))
if err != nil {
return nil, err
}
// Downloaded
var downloaded int64 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, downloaded)
if err != nil {
return nil, err
}
// Left
var left int64 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, left)
if err != nil {
return nil, err
}
// Uploaded
var uploaded int64 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, uploaded)
if err != nil {
return nil, err
}
// Event
var event int32 = EVENT_NONE
err = binary.Write(scrapeRequest, binary.BigEndian, event)
if err != nil {
return nil, err
}
// IP address
var ipAddress uint32 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, ipAddress)
if err != nil {
return nil, err
}
// Key
var key int32 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, key)
if err != nil {
return nil, err
}
// Num want
var numWant int32 = 200
err = binary.Write(scrapeRequest, binary.BigEndian, numWant)
if err != nil {
return nil, err
}
// Port
var port int16 = 0
err = binary.Write(scrapeRequest, binary.BigEndian, port)
if err != nil {
return nil, err
}
_, err = t.conn.Write(scrapeRequest.Bytes())
if err != nil {
return nil, err
}
responseBytes := make([]byte, 20+200*6)
responseLen, err := t.conn.Read(responseBytes)
if err != nil {
return nil, err
}
if responseLen < 16 {
return nil, fmt.Errorf("Unexpected response size %d", responseLen)
}
response := bytes.NewBuffer(responseBytes)
// Action
var responseAction uint32
err = binary.Read(response, binary.BigEndian, &responseAction)
if err != nil {
return nil, err
}
if action != ACTION_ANNOUNCE {
return nil, fmt.Errorf("Unexpected response action %d", action)
}
// Transaction ID
var responseTransactionID uint32
err = binary.Read(response, binary.BigEndian, &responseTransactionID)
if err != nil {
return nil, err
}
if transactionID != responseTransactionID {
return nil, fmt.Errorf(
"Unexpected response transactionID %x",
responseTransactionID,
)
}
// Interval
var interval uint32
err = binary.Read(response, binary.BigEndian, &interval)
if err != nil {
return nil, err
}
// Leechers
var leechers uint32
err = binary.Read(response, binary.BigEndian, &leechers)
if err != nil {
return nil, err
}
// Seeders
var seeders uint32
err = binary.Read(response, binary.BigEndian, &seeders)
if err != nil {
return nil, err
}
peerCount := (responseLen - 20) / 6
peerDataBytes := make([]byte, 6*peerCount)
err = binary.Read(response, binary.BigEndian, &peerDataBytes)
if err != nil {
return nil, err
}
return &trackerResponse{
Interval: uint(interval),
Complete: uint(seeders),
Incomplete: uint(leechers),
Peers: string(peerDataBytes),
}, nil
}
func (t *tracker) Process(infohash *Infohash, redisClient *redis.Client) {
app.Debugf("Tracker.Process()", "Processing %s", infohash.RawString())
response, err := t.query(infohash.String())
if err != nil {
app.Debugf("Tracker.Process()", "Error querying %s: %s", infohash.GetTracker().GetURL().String(), err)
stathat.PostEZCount("errors.query-udp-tracker", "lovek323@gmail.com", 1)
RedisCmd(
redisClient,
"SREM",
fmt.Sprintf("torrents.%s.trackers", infohash.String()),
t.url.String(),
)
infohash.UpdateScore(0.5, redisClient)
return
}
peers, err := ParsePeers(response.Peers)
if err != nil {
panic(err)
}
if len(peers) == 0 {
RedisCmd(
redisClient,
"SREM",
fmt.Sprintf("torrents.%s.trackers", infohash.String()),
t.url.String(),
)
infohash.UpdateScore(0.5, redisClient)
}
newPeers := 0
for _, peer := range peers {
if peer.Process(infohash, redisClient) == PEER_NEW {
newPeers++
}
}
var scoreModifier float64
peerThreshold := int(float64(t.maxPeerCount) * float64(TORRENT_MAX_PEER_THRESHOLD))
hasMaxPeers := len(peers) >= t.maxPeerCount
hasEnoughNewPeers := newPeers > peerThreshold
if hasMaxPeers && hasEnoughNewPeers {
scoreModifier = 1.2
} else {
RedisCmd(
redisClient,
"SREM",
fmt.Sprintf("torrents.%s.trackers", infohash.String()),
t.url.String(),
)
scoreModifier = 0.8
}
infohash.UpdateScore(scoreModifier, redisClient)
if newPeers > 0 {
log.Printf(
"P: %03d/%03d H: %s S: %e [%d torrents/hr] [%d peers/hr]\n",
newPeers,
len(peers),
infohash.String(),
infohash.GetScore(),
app.GetTorrentRateCounter().Rate(),
app.GetPeerRateCounter().Rate(),
)
}
}
func (t *tracker) GetURL() *url.URL {
return t.url
}