package tracker import ( "errors" "net/http" "net/url" "github.com/anacrolix/dht/krpc" ) // Marshalled as binary by the UDP client, so be careful making changes. type AnnounceRequest struct { InfoHash [20]byte PeerId [20]byte Downloaded int64 Left uint64 Uploaded int64 // Apparently this is optional. None can be used for announces done at // regular intervals. Event AnnounceEvent IPAddress uint32 Key int32 NumWant int32 // How many peer addresses are desired. -1 for default. Port uint16 } // 82 bytes type AnnounceResponse struct { Interval int32 // Minimum seconds the local peer should wait before next announce. Leechers int32 Seeders int32 Peers []Peer } type AnnounceEvent int32 func (e AnnounceEvent) String() string { // See BEP 3, "event". return []string{"empty", "completed", "started", "stopped"}[e] } const ( None AnnounceEvent = iota Completed // The local peer just completed the torrent. Started // The local peer has just resumed this torrent. Stopped // The local peer is leaving the swarm. ) var ( ErrBadScheme = errors.New("unknown scheme") ) type Announce struct { TrackerUrl string Request AnnounceRequest HostHeader string UserAgent string HttpClient *http.Client UdpNetwork string // If the port is zero, it's assumed to be the same as the Request.Port ClientIp4 krpc.NodeAddr // If the port is zero, it's assumed to be the same as the Request.Port ClientIp6 krpc.NodeAddr } // In an FP language with currying, what order what you put these params? func (me Announce) Do() (res AnnounceResponse, err error) { _url, err := url.Parse(me.TrackerUrl) if err != nil { return } switch _url.Scheme { case "http", "https": return announceHTTP(me, _url) case "udp", "udp4", "udp6": return announceUDP(me, _url) default: err = ErrBadScheme return } }