145 lines
3.4 KiB
Go
145 lines
3.4 KiB
Go
package torrent
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"strings"
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"sync"
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"github.com/anacrolix/torrent/common"
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"github.com/anacrolix/torrent/metainfo"
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pp "github.com/anacrolix/torrent/peer_protocol"
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"github.com/anacrolix/torrent/segments"
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"github.com/anacrolix/torrent/webseed"
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)
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type webseedPeer struct {
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client webseed.Client
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activeRequests map[Request]webseed.Request
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requesterCond sync.Cond
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peer Peer
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}
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var _ peerImpl = (*webseedPeer)(nil)
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func (me *webseedPeer) writeBufferFull() bool {
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return false
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}
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func (me *webseedPeer) connStatusString() string {
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return me.client.Url
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}
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func (ws *webseedPeer) String() string {
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return fmt.Sprintf("webseed peer for %q", ws.client.Url)
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}
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func (ws *webseedPeer) onGotInfo(info *metainfo.Info) {
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ws.client.FileIndex = segments.NewIndex(common.LengthIterFromUpvertedFiles(info.UpvertedFiles()))
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ws.client.Info = info
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}
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func (ws *webseedPeer) writeInterested(interested bool) bool {
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return true
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}
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func (ws *webseedPeer) _cancel(r Request) {
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active, ok := ws.activeRequests[r]
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if ok {
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active.Cancel()
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}
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}
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func (ws *webseedPeer) intoSpec(r Request) webseed.RequestSpec {
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return webseed.RequestSpec{ws.peer.t.requestOffset(r), int64(r.Length)}
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}
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func (ws *webseedPeer) _request(r Request) {
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ws.requesterCond.Signal()
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}
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func (ws *webseedPeer) doRequest(r Request) {
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webseedRequest := ws.client.NewRequest(ws.intoSpec(r))
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ws.activeRequests[r] = webseedRequest
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func() {
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ws.requesterCond.L.Unlock()
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defer ws.requesterCond.L.Lock()
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ws.requestResultHandler(r, webseedRequest)
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}()
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delete(ws.activeRequests, r)
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}
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func (ws *webseedPeer) requester() {
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ws.requesterCond.L.Lock()
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defer ws.requesterCond.L.Unlock()
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start:
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for !ws.peer.closed.IsSet() {
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for r := range ws.peer.requests {
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if _, ok := ws.activeRequests[r]; ok {
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continue
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}
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ws.doRequest(r)
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goto start
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}
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ws.requesterCond.Wait()
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}
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}
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func (ws *webseedPeer) connectionFlags() string {
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return "WS"
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}
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// TODO: This is called when banning peers. Perhaps we want to be able to ban webseeds too. We could
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// return bool if this is even possible, and if it isn't, skip to the next drop candidate.
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func (ws *webseedPeer) drop() {}
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func (ws *webseedPeer) updateRequests() {
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}
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func (ws *webseedPeer) onClose() {
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ws.peer.logger.Print("closing")
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for _, r := range ws.activeRequests {
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r.Cancel()
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}
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ws.requesterCond.Broadcast()
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}
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func (ws *webseedPeer) requestResultHandler(r Request, webseedRequest webseed.Request) {
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result := <-webseedRequest.Result
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ws.peer.t.cl.lock()
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defer ws.peer.t.cl.unlock()
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if result.Err != nil {
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if !errors.Is(result.Err, context.Canceled) {
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ws.peer.logger.Printf("Request %v rejected: %v", r, result.Err)
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}
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// We need to filter out temporary errors, but this is a nightmare in Go. Currently a bad
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// webseed URL can starve out the good ones due to the chunk selection algorithm.
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const closeOnAllErrors = false
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if closeOnAllErrors ||
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strings.Contains(result.Err.Error(), "unsupported protocol scheme") ||
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func() bool {
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var err webseed.ErrBadResponse
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if !errors.As(result.Err, &err) {
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return false
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}
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return err.Response.StatusCode == http.StatusNotFound
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}() {
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ws.peer.close()
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} else {
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ws.peer.remoteRejectedRequest(r)
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}
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} else {
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err := ws.peer.receiveChunk(&pp.Message{
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Type: pp.Piece,
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Index: r.Index,
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Begin: r.Begin,
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Piece: result.Bytes,
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})
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if err != nil {
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panic(err)
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}
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}
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}
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