requesting.go

   1 package torrent
   2
   3 import (
   4         "time"
   5         "unsafe"
   6
   7         "github.com/anacrolix/missinggo/v2/bitmap"
   8
   9         "github.com/anacrolix/chansync"
  10         request_strategy "github.com/anacrolix/torrent/request-strategy"
  11 )
  12
  13 func (cl *Client) requester() {
  14         for {
  15                 update := func() chansync.Signaled {
  16                         cl.lock()
  17                         defer cl.unlock()
  18                         cl.doRequests()
  19                         return cl.updateRequests.Signaled()
  20                 }()
  21                 select {
  22                 case <-cl.closed.Done():
  23                         return
  24                 case <-time.After(100 * time.Millisecond):
  25                 }
  26                 select {
  27                 case <-cl.closed.Done():
  28                         return
  29                 case <-update:
  30                 case <-time.After(time.Second):
  31                 }
  32         }
  33 }
  34
  35 func (cl *Client) tickleRequester() {
  36         cl.updateRequests.Broadcast()
  37 }
  38
  39 func (cl *Client) doRequests() {
  40         ts := make([]request_strategy.Torrent, 0, len(cl.torrents))
  41         for _, t := range cl.torrents {
  42                 rst := request_strategy.Torrent{
  43                         StableId: uintptr(unsafe.Pointer(t)),
  44                 }
  45                 if t.storage != nil {
  46                         rst.Capacity = t.storage.Capacity
  47                 }
  48                 rst.Pieces = make([]request_strategy.Piece, 0, len(t.pieces))
  49                 for i := range t.pieces {
  50                         p := &t.pieces[i]
  51                         rst.Pieces = append(rst.Pieces, request_strategy.Piece{
  52                                 Request:           !t.ignorePieceForRequests(i),
  53                                 Priority:          p.purePriority(),
  54                                 Partial:           t.piecePartiallyDownloaded(i),
  55                                 Availability:      p.availability,
  56                                 Length:            int64(p.length()),
  57                                 NumPendingChunks:  int(t.pieceNumPendingChunks(i)),
  58                                 IterPendingChunks: p.iterUndirtiedChunks,
  59                         })
  60                 }
  61                 t.iterPeers(func(p *Peer) {
  62                         if p.closed.IsSet() {
  63                                 return
  64                         }
  65                         if p.piecesReceivedSinceLastRequestUpdate > p.maxPiecesReceivedBetweenRequestUpdates {
  66                                 p.maxPiecesReceivedBetweenRequestUpdates = p.piecesReceivedSinceLastRequestUpdate
  67                         }
  68                         p.piecesReceivedSinceLastRequestUpdate = 0
  69                         rst.Peers = append(rst.Peers, request_strategy.Peer{
  70                                 HasPiece:    p.peerHasPiece,
  71                                 MaxRequests: p.nominalMaxRequests(),
  72                                 HasExistingRequest: func(r request_strategy.Request) bool {
  73                                         _, ok := p.actualRequestState.Requests[r]
  74                                         return ok
  75                                 },
  76                                 Choking: p.peerChoking,
  77                                 PieceAllowedFast: func(i pieceIndex) bool {
  78                                         return p.peerAllowedFast.Contains(bitmap.BitIndex(i))
  79                                 },
  80                                 DownloadRate: p.downloadRate(),
  81                                 Age:          time.Since(p.completedHandshake),
  82                                 Id: peerId{
  83                                         Peer: p,
  84                                         ptr:  uintptr(unsafe.Pointer(p)),
  85                                 },
  86                         })
  87                 })
  88                 ts = append(ts, rst)
  89         }
  90         nextPeerStates := request_strategy.Run(request_strategy.Input{
  91                 Torrents:           ts,
  92                 MaxUnverifiedBytes: cl.config.MaxUnverifiedBytes,
  93         })
  94         for p, state := range nextPeerStates {
  95                 setPeerNextRequestState(p, state)
  96         }
  97 }
  98
  99 type peerId struct {
 100         *Peer
 101         ptr uintptr
 102 }
 103
 104 func (p peerId) Uintptr() uintptr {
 105         return p.ptr
 106 }
 107
 108 func setPeerNextRequestState(_p request_strategy.PeerId, rp request_strategy.PeerNextRequestState) {
 109         p := _p.(peerId).Peer
 110         p.nextRequestState = rp
 111         p.onNextRequestStateChanged()
 112 }
 113
 114 func (p *Peer) applyNextRequestState() bool {
 115         next := p.nextRequestState
 116         current := p.actualRequestState
 117         if !p.setInterested(next.Interested) {
 118                 return false
 119         }
 120         for req := range current.Requests {
 121                 if _, ok := next.Requests[req]; !ok {
 122                         if !p.cancel(req) {
 123                                 return false
 124                         }
 125                 }
 126         }
 127         for req := range next.Requests {
 128                 more, err := p.request(req)
 129                 if err != nil {
 130                         panic(err)
 131                 } /* else {
 132                         log.Print(req)
 133                 } */
 134                 if !more {
 135                         return false
 136                 }
 137         }
 138         return true
 139 }