92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package tracker
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import (
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"context"
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"errors"
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"net/http"
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"net/url"
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"time"
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"github.com/anacrolix/dht/v2/krpc"
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)
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// Marshalled as binary by the UDP client, so be careful making changes.
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type AnnounceRequest struct {
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InfoHash [20]byte
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PeerId [20]byte
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Downloaded int64
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Left int64 // If less than 0, math.MaxInt64 will be used for HTTP trackers instead.
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Uploaded int64
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// Apparently this is optional. None can be used for announces done at
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// regular intervals.
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Event AnnounceEvent
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IPAddress uint32
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Key int32
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NumWant int32 // How many peer addresses are desired. -1 for default.
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Port uint16
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} // 82 bytes
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type AnnounceResponse struct {
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Interval int32 // Minimum seconds the local peer should wait before next announce.
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Leechers int32
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Seeders int32
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Peers []Peer
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}
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type AnnounceEvent int32
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func (e AnnounceEvent) String() string {
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// See BEP 3, "event".
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return []string{"empty", "completed", "started", "stopped"}[e]
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}
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const (
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None AnnounceEvent = iota
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Completed // The local peer just completed the torrent.
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Started // The local peer has just resumed this torrent.
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Stopped // The local peer is leaving the swarm.
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)
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var (
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ErrBadScheme = errors.New("unknown scheme")
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)
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type Announce struct {
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TrackerUrl string
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Request AnnounceRequest
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HostHeader string
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HTTPProxy func(*http.Request) (*url.URL, error)
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ServerName string
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UserAgent string
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UdpNetwork string
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// If the port is zero, it's assumed to be the same as the Request.Port.
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ClientIp4 krpc.NodeAddr
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// If the port is zero, it's assumed to be the same as the Request.Port.
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ClientIp6 krpc.NodeAddr
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Context context.Context
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}
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func (me Announce) Do() (res AnnounceResponse, err error) {
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_url, err := url.Parse(me.TrackerUrl)
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if err != nil {
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return
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}
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if me.Context == nil {
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// This is just to maintain the old behaviour that should be a timeout of 15s. Users can
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// override it by providing their own Context. See comments elsewhere about longer timeouts
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// acting as rate limiting overloaded trackers.
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ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
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defer cancel()
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me.Context = ctx
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}
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switch _url.Scheme {
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case "http", "https":
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return announceHTTP(me, _url)
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case "udp", "udp4", "udp6":
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return announceUDP(me, _url)
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default:
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err = ErrBadScheme
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return
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}
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}
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