11 "github.com/anacrolix/torrent/common"
12 "github.com/anacrolix/torrent/metainfo"
13 pp "github.com/anacrolix/torrent/peer_protocol"
14 "github.com/anacrolix/torrent/segments"
15 "github.com/anacrolix/torrent/webseed"
18 type webseedPeer struct {
20 activeRequests map[Request]webseed.Request
21 requesterCond sync.Cond
25 var _ peerImpl = (*webseedPeer)(nil)
27 func (me *webseedPeer) writeBufferFull() bool {
31 func (me *webseedPeer) connStatusString() string {
35 func (ws *webseedPeer) String() string {
36 return fmt.Sprintf("webseed peer for %q", ws.client.Url)
39 func (ws *webseedPeer) onGotInfo(info *metainfo.Info) {
40 ws.client.FileIndex = segments.NewIndex(common.LengthIterFromUpvertedFiles(info.UpvertedFiles()))
44 func (ws *webseedPeer) writeInterested(interested bool) bool {
48 func (ws *webseedPeer) _cancel(r RequestIndex) bool {
49 active, ok := ws.activeRequests[ws.peer.t.requestIndexToRequest(r)]
52 if !ws.peer.deleteRequest(r) {
53 panic("cancelled webseed request should exist")
55 if ws.peer.actualRequestState.Requests.GetCardinality() == 0 {
56 ws.peer.updateRequests("webseedPeer._cancel")
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) {
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 ws.requestResultHandler(r, webseedRequest)
79 delete(ws.activeRequests, r)
82 func (ws *webseedPeer) requester() {
83 ws.requesterCond.L.Lock()
84 defer ws.requesterCond.L.Unlock()
86 for !ws.peer.closed.IsSet() {
88 ws.peer.actualRequestState.Requests.Iterate(func(x uint32) bool {
89 r := ws.peer.t.requestIndexToRequest(x)
90 if _, ok := ws.activeRequests[r]; ok {
100 ws.requesterCond.Wait()
104 func (ws *webseedPeer) connectionFlags() string {
108 // TODO: This is called when banning peers. Perhaps we want to be able to ban webseeds too. We could
109 // return bool if this is even possible, and if it isn't, skip to the next drop candidate.
110 func (ws *webseedPeer) drop() {}
112 func (ws *webseedPeer) updateRequests(reason string) {
115 func (ws *webseedPeer) onClose() {
116 ws.peer.logger.Print("closing")
117 for _, r := range ws.activeRequests {
120 ws.requesterCond.Broadcast()
123 func (ws *webseedPeer) requestResultHandler(r Request, webseedRequest webseed.Request) {
124 result := <-webseedRequest.Result
125 // We do this here rather than inside receiveChunk, since we want to count errors too. I'm not
126 // sure if we can divine which errors indicate cancellation on our end without hitting the
128 ws.peer.doChunkReadStats(int64(len(result.Bytes)))
130 defer ws.peer.t.cl.unlock()
131 if result.Err != nil {
132 if !errors.Is(result.Err, context.Canceled) {
133 ws.peer.logger.Printf("Request %v rejected: %v", r, result.Err)
135 // We need to filter out temporary errors, but this is a nightmare in Go. Currently a bad
136 // webseed URL can starve out the good ones due to the chunk selection algorithm.
137 const closeOnAllErrors = false
138 if closeOnAllErrors ||
139 strings.Contains(result.Err.Error(), "unsupported protocol scheme") ||
141 var err webseed.ErrBadResponse
142 if !errors.As(result.Err, &err) {
145 return err.Response.StatusCode == http.StatusNotFound
149 ws.peer.remoteRejectedRequest(ws.peer.t.requestIndexFromRequest(r))
152 err := ws.peer.receiveChunk(&pp.Message{
164 func (me *webseedPeer) onNextRequestStateChanged() {
165 me.peer.applyNextRequestState()