func NewTorrent(torrent string) (metaInfo *bencode.MetaInfo, err os.Error) {
var input io.ReadCloser
if strings.HasPrefix(torrent, "http:") {
// 6g compiler bug prevents us from writing r, _, err :=
var r *http.Response
if r, _, err = http.Get(torrent); err != nil {
return
}
input = r.Body
} else {
if input, err = os.Open(torrent, os.O_RDONLY, 0666); err != nil {
return
}
}
// We need to calcuate the sha1 of the Info map, including every value in the
// map. The easiest way to do this is to read the data using the Decode
// API, and then pick through it manually.
var m interface{}
m, err = bencode.Decode(input)
input.Close()
if err != nil {
err = os.NewError("Couldn't parse torrent file phase 1: " + err.String())
return
}
topMap, ok := m.(map[string]interface{})
if !ok {
err = os.NewError("Couldn't parse torrent file phase 2.")
return
}
infoMap, ok := topMap["info"]
if !ok {
err = os.NewError("Couldn't parse torrent file. info")
return
}
var b bytes.Buffer
if err = bencode.Marshal(&b, infoMap); err != nil {
return
}
hash := sha1.New()
hash.Write(b.Bytes())
var m2 bencode.MetaInfo
err = bencode.Unmarshal(&b, &m2.Info)
if err != nil {
return
}
//log.Println(m2.Info)
m2.Infohash = string(hash.Sum())
m2.Announce = getString(topMap, "announce")
m2.CreationDate = getString(topMap, "creation date")
m2.Comment = getString(topMap, "comment")
m2.CreatedBy = getString(topMap, "created by")
m2.Encoding = getString(topMap, "encoding")
m2.Announce_list = append(getArrayString(topMap, "announce-list"), m2.Announce)
metaInfo = &m2
return
}
func (t *Tracker) Request(num_peers int) (err os.Error) {
// Prepare request to make to the tracker
left := (t.bitfield.Len() - t.bitfield.Count()) * t.pieceLength
if len(t.status) == 0 && !t.completed {
if left == 0 {
t.status = "completed"
}
}
url := fmt.Sprint(t.url,
"?",
"info_hash=", http.URLEscape(t.infohash),
"&peer_id=", http.URLEscape(t.peerId),
"&port=", http.URLEscape(t.port),
"&uploaded=", http.URLEscape(strconv.Itoa64(t.uploaded)),
"&downloaded=", http.URLEscape(strconv.Itoa64(t.downloaded)),
"&left=", http.URLEscape(strconv.Itoa64(left)),
"&numwant=", http.URLEscape(strconv.Itoa(num_peers)),
"&status=", http.URLEscape(t.status),
"&compact=1")
if len(t.trackerId) > 0 {
url += "&tracker_id=" + http.URLEscape(t.trackerId)
}
/*
r, _, err := http.Get(url)
if err != nil {
return
}
defer r.Body.Close()
if r.StatusCode >= 400 {
data, _ := ioutil.ReadAll(r.Body)
reason := "Bad Request " + string(data)
log.Println(reason)
err = os.NewError(reason)
return
}
var tr2 TrackerResponse
err = bencode.Unmarshal(r.Body, &tr2)
r.Body.Close()
if err != nil {
return
}
tr = &tr2
return
*/
response, _, err := http.Get(url)
if err != nil {
return
}
defer response.Body.Close()
// Check if request was succesful
if response.StatusCode != http.StatusOK {
data, _ := ioutil.ReadAll(response.Body)
reason := "Bad Request " + string(data)
err = os.NewError(reason)
return
}
// Create new TrackerResponse and decode the data
var tr bencode.TrackerResponse
err = bencode.Unmarshal(response.Body, &tr)
if err != nil {
return
}
t.interval = tr.Interval
t.min_interval = tr.Min_interval
if len(tr.Tracker_id) > 0 {
t.trackerId = tr.Tracker_id
}
// Obtain new peers list
peers := list.New()
//log.Println("Tracker -> Decoded", len(tr.Peers), "peers")
for i := 0; i < len(tr.Peers); i = i + 6 {
peers.PushFront(fmt.Sprintf("%d.%d.%d.%d:%d", tr.Peers[i+0], tr.Peers[i+1], tr.Peers[i+2], tr.Peers[i+3], binary.BigEndian.Uint16([]byte(tr.Peers[i+4:i+6]))))
//ip := fmt.Sprintf("%d.%d.%d.%d", peers[i+0], peers[i+1], peers[i+2], peers[i+3])
//port := int64(binary.BigEndian.Uint16(peers[i+4:i+6]))
//tracker.Peers = appendPeer(tracker.Peers, Peer{Ip: ip, Port: port})
}
/*for _, peer := range tr.Peers {
peers.PushFront(fmt.Sprintf("%s:%d", peer.Ip, peer.Port))
}*/
//log.Println("Tracker -> Received", msgPeers.Len(), "peers")
// Send the new data to the PeerMgr process
t.trackerMgr.SavePeers(peers)
if t.status == "completed" {
t.completed = true
}
t.status = ""
return
}