11 "github.com/RoaringBitmap/roaring"
12 "github.com/anacrolix/log"
13 "github.com/anacrolix/torrent/metainfo"
14 pp "github.com/anacrolix/torrent/peer_protocol"
15 "github.com/anacrolix/torrent/webseed"
18 type webseedPeer struct {
19 // First field for stats alignment.
22 activeRequests map[Request]webseed.Request
23 requesterCond sync.Cond
24 // Number of requester routines.
28 var _ peerImpl = (*webseedPeer)(nil)
30 func (me *webseedPeer) connStatusString() string {
34 func (ws *webseedPeer) String() string {
35 return fmt.Sprintf("webseed peer for %q", ws.client.Url)
38 func (ws *webseedPeer) onGotInfo(info *metainfo.Info) {
39 ws.client.SetInfo(info)
40 // There should be probably be a callback in Client instead, so it can remove pieces at its whim
42 ws.client.Pieces.Iterate(func(x uint32) bool {
43 ws.peer.t.incPieceAvailability(pieceIndex(x))
48 func (ws *webseedPeer) writeInterested(interested bool) bool {
52 func (ws *webseedPeer) _cancel(r RequestIndex) bool {
53 if active, ok := ws.activeRequests[ws.peer.t.requestIndexToRequest(r)]; ok {
55 // The requester is running and will handle the result.
58 // There should be no requester handling this, so no further events will occur.
62 func (ws *webseedPeer) intoSpec(r Request) webseed.RequestSpec {
63 return webseed.RequestSpec{ws.peer.t.requestOffset(r), int64(r.Length)}
66 func (ws *webseedPeer) _request(r Request) bool {
67 ws.requesterCond.Signal()
71 func (ws *webseedPeer) doRequest(r Request) error {
72 webseedRequest := ws.client.NewRequest(ws.intoSpec(r))
73 ws.activeRequests[r] = webseedRequest
75 ws.requesterCond.L.Unlock()
76 defer ws.requesterCond.L.Lock()
77 return ws.requestResultHandler(r, webseedRequest)
79 delete(ws.activeRequests, r)
83 func (ws *webseedPeer) requester(i int) {
84 ws.requesterCond.L.Lock()
85 defer ws.requesterCond.L.Unlock()
87 for !ws.peer.closed.IsSet() {
89 ws.peer.requestState.Requests.Iterate(func(x uint32) bool {
90 r := ws.peer.t.requestIndexToRequest(x)
91 if _, ok := ws.activeRequests[r]; ok {
94 err := ws.doRequest(r)
95 ws.requesterCond.L.Unlock()
96 if err != nil && !errors.Is(err, context.Canceled) {
97 log.Printf("requester %v: error doing webseed request %v: %v", i, r, err)
100 if errors.Is(err, webseed.ErrTooFast) {
101 time.Sleep(time.Duration(rand.Int63n(int64(10 * time.Second))))
103 ws.requesterCond.L.Lock()
109 ws.requesterCond.Wait()
113 func (ws *webseedPeer) connectionFlags() string {
117 // TODO: This is called when banning peers. Perhaps we want to be able to ban webseeds too. We could
118 // return bool if this is even possible, and if it isn't, skip to the next drop candidate.
119 func (ws *webseedPeer) drop() {}
121 func (ws *webseedPeer) handleUpdateRequests() {
122 // Because this is synchronous, webseed peers seem to get first dibs on newly prioritized
126 defer ws.peer.t.cl.unlock()
127 ws.peer.maybeUpdateActualRequestState()
131 func (ws *webseedPeer) onClose() {
132 ws.peer.logger.Levelf(log.Debug, "closing")
133 // Just deleting them means we would have to manually cancel active requests.
134 ws.peer.cancelAllRequests()
135 ws.peer.t.iterPeers(func(p *Peer) {
136 if p.isLowOnRequests() {
137 p.updateRequests("webseedPeer.onClose")
140 ws.requesterCond.Broadcast()
143 func (ws *webseedPeer) requestResultHandler(r Request, webseedRequest webseed.Request) error {
144 result := <-webseedRequest.Result
145 close(webseedRequest.Result) // one-shot
146 // We do this here rather than inside receiveChunk, since we want to count errors too. I'm not
147 // sure if we can divine which errors indicate cancellation on our end without hitting the
149 if len(result.Bytes) != 0 || result.Err == nil {
150 // Increment ChunksRead and friends
151 ws.peer.doChunkReadStats(int64(len(result.Bytes)))
153 ws.peer.readBytes(int64(len(result.Bytes)))
155 defer ws.peer.t.cl.unlock()
156 if ws.peer.t.closed.IsSet() {
162 case errors.Is(err, context.Canceled):
163 case errors.Is(err, webseed.ErrTooFast):
164 case ws.peer.closed.IsSet():
166 ws.peer.logger.Printf("Request %v rejected: %v", r, result.Err)
167 // // Here lies my attempt to extract something concrete from Go's error system. RIP.
168 // cfg := spew.NewDefaultConfig()
169 // cfg.DisableMethods = true
170 // cfg.Dump(result.Err)
171 log.Printf("closing %v", ws)
174 if !ws.peer.remoteRejectedRequest(ws.peer.t.requestIndexFromRequest(r)) {
175 panic("invalid reject")
179 err = ws.peer.receiveChunk(&pp.Message{
191 func (me *webseedPeer) peerPieces() *roaring.Bitmap {
192 return &me.client.Pieces
195 func (cn *webseedPeer) peerHasAllPieces() (all, known bool) {
196 if !cn.peer.t.haveInfo() {
199 return cn.client.Pieces.GetCardinality() == uint64(cn.peer.t.numPieces()), true