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 {
20 activeRequests map[Request]webseed.Request
21 requesterCond sync.Cond
23 // Number of requester routines.
27 var _ peerImpl = (*webseedPeer)(nil)
29 func (me *webseedPeer) connStatusString() string {
33 func (ws *webseedPeer) String() string {
34 return fmt.Sprintf("webseed peer for %q", ws.client.Url)
37 func (ws *webseedPeer) onGotInfo(info *metainfo.Info) {
38 ws.client.SetInfo(info)
39 // There should be probably be a callback in Client instead, so it can remove pieces at its whim
41 ws.client.Pieces.Iterate(func(x uint32) bool {
42 ws.peer.t.incPieceAvailability(pieceIndex(x))
47 func (ws *webseedPeer) writeInterested(interested bool) bool {
51 func (ws *webseedPeer) _cancel(r RequestIndex) {
52 active, ok := ws.activeRequests[ws.peer.t.requestIndexToRequest(r)]
56 if !ws.peer.deleteRequest(r) {
57 panic("cancelled webseed request should exist")
59 if ws.peer.isLowOnRequests() {
60 ws.peer.updateRequests("webseedPeer._cancel")
64 func (ws *webseedPeer) intoSpec(r Request) webseed.RequestSpec {
65 return webseed.RequestSpec{ws.peer.t.requestOffset(r), int64(r.Length)}
68 func (ws *webseedPeer) _request(r Request) bool {
69 ws.requesterCond.Signal()
73 func (ws *webseedPeer) doRequest(r Request) error {
74 webseedRequest := ws.client.NewRequest(ws.intoSpec(r))
75 ws.activeRequests[r] = webseedRequest
77 ws.requesterCond.L.Unlock()
78 defer ws.requesterCond.L.Lock()
79 return ws.requestResultHandler(r, webseedRequest)
81 delete(ws.activeRequests, r)
85 func (ws *webseedPeer) requester(i int) {
86 ws.requesterCond.L.Lock()
87 defer ws.requesterCond.L.Unlock()
89 for !ws.peer.closed.IsSet() {
91 ws.peer.actualRequestState.Requests.Iterate(func(x uint32) bool {
92 r := ws.peer.t.requestIndexToRequest(x)
93 if _, ok := ws.activeRequests[r]; ok {
96 err := ws.doRequest(r)
97 ws.requesterCond.L.Unlock()
98 if err != nil && !errors.Is(err, context.Canceled) {
99 log.Printf("requester %v: error doing webseed request %v: %v", i, r, err)
102 if errors.Is(err, webseed.ErrTooFast) {
103 time.Sleep(time.Duration(rand.Int63n(int64(10 * time.Second))))
105 ws.requesterCond.L.Lock()
111 ws.requesterCond.Wait()
115 func (ws *webseedPeer) connectionFlags() string {
119 // TODO: This is called when banning peers. Perhaps we want to be able to ban webseeds too. We could
120 // return bool if this is even possible, and if it isn't, skip to the next drop candidate.
121 func (ws *webseedPeer) drop() {}
123 func (ws *webseedPeer) handleUpdateRequests() {
124 // Because this is synchronous, webseed peers seem to get first dibs on newly prioritized
128 defer ws.peer.t.cl.unlock()
129 ws.peer.maybeUpdateActualRequestState()
133 func (ws *webseedPeer) onClose() {
134 ws.peer.logger.WithLevel(log.Debug).Print("closing")
135 ws.peer.deleteAllRequests()
136 for _, r := range ws.activeRequests {
139 ws.requesterCond.Broadcast()
142 func (ws *webseedPeer) requestResultHandler(r Request, webseedRequest webseed.Request) error {
143 result := <-webseedRequest.Result
144 close(webseedRequest.Result) // one-shot
145 // We do this here rather than inside receiveChunk, since we want to count errors too. I'm not
146 // sure if we can divine which errors indicate cancellation on our end without hitting the
148 if len(result.Bytes) != 0 || result.Err == nil {
149 // Increment ChunksRead and friends
150 ws.peer.doChunkReadStats(int64(len(result.Bytes)))
152 ws.peer.readBytes(int64(len(result.Bytes)))
154 defer ws.peer.t.cl.unlock()
155 if ws.peer.t.closed.IsSet() {
161 case errors.Is(err, context.Canceled):
162 case errors.Is(err, webseed.ErrTooFast):
163 case ws.peer.closed.IsSet():
165 ws.peer.logger.Printf("Request %v rejected: %v", r, result.Err)
166 // // Here lies my attempt to extract something concrete from Go's error system. RIP.
167 // cfg := spew.NewDefaultConfig()
168 // cfg.DisableMethods = true
169 // cfg.Dump(result.Err)
170 log.Printf("closing %v", ws)
173 ws.peer.remoteRejectedRequest(ws.peer.t.requestIndexFromRequest(r))
176 err = ws.peer.receiveChunk(&pp.Message{
188 func (me *webseedPeer) isLowOnRequests() bool {
189 return me.peer.actualRequestState.Requests.GetCardinality() < uint64(me.maxRequests)
192 func (me *webseedPeer) peerPieces() *roaring.Bitmap {
193 return &me.client.Pieces
196 func (cn *webseedPeer) peerHasAllPieces() (all, known bool) {
197 if !cn.peer.t.haveInfo() {
200 return cn.client.Pieces.GetCardinality() == uint64(cn.peer.t.numPieces()), true