306 lines
8.4 KiB
Go
306 lines
8.4 KiB
Go
package torrent
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import (
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"container/heap"
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"context"
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"encoding/gob"
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"math/rand"
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"reflect"
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"runtime/pprof"
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"time"
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"unsafe"
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"github.com/RoaringBitmap/roaring"
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"github.com/anacrolix/log"
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"github.com/anacrolix/multiless"
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request_strategy "github.com/anacrolix/torrent/request-strategy"
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)
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func (cl *Client) tickleRequester() {
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cl.updateRequests.Broadcast()
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}
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func (cl *Client) getRequestStrategyInput() request_strategy.Input {
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ts := make([]request_strategy.Torrent, 0, len(cl.torrents))
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for _, t := range cl.torrents {
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if !t.haveInfo() {
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// This would be removed if metadata is handled here. We have to guard against not
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// knowing the piece size. If we have no info, we have no pieces too, so the end result
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// is the same.
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continue
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}
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rst := request_strategy.Torrent{
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InfoHash: t.infoHash,
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ChunksPerPiece: t.chunksPerRegularPiece(),
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}
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if t.storage != nil {
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rst.Capacity = t.storage.Capacity
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}
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rst.Pieces = make([]request_strategy.Piece, 0, len(t.pieces))
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for i := range t.pieces {
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p := &t.pieces[i]
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rst.Pieces = append(rst.Pieces, request_strategy.Piece{
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Request: !t.ignorePieceForRequests(i),
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Priority: p.purePriority(),
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Partial: t.piecePartiallyDownloaded(i),
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Availability: p.availability,
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Length: int64(p.length()),
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NumPendingChunks: int(t.pieceNumPendingChunks(i)),
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IterPendingChunks: &p.undirtiedChunksIter,
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})
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}
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t.iterPeers(func(p *Peer) {
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if p.closed.IsSet() {
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return
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}
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if p.piecesReceivedSinceLastRequestUpdate > p.maxPiecesReceivedBetweenRequestUpdates {
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p.maxPiecesReceivedBetweenRequestUpdates = p.piecesReceivedSinceLastRequestUpdate
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}
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p.piecesReceivedSinceLastRequestUpdate = 0
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rst.Peers = append(rst.Peers, request_strategy.Peer{
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Pieces: *p.newPeerPieces(),
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MaxRequests: p.nominalMaxRequests(),
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ExistingRequests: p.actualRequestState.Requests,
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Choking: p.peerChoking,
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PieceAllowedFast: p.peerAllowedFast,
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DownloadRate: p.downloadRate(),
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Age: time.Since(p.completedHandshake),
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Id: peerId{
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Peer: p,
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ptr: uintptr(unsafe.Pointer(p)),
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},
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})
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})
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ts = append(ts, rst)
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}
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return request_strategy.Input{
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Torrents: ts,
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MaxUnverifiedBytes: cl.config.MaxUnverifiedBytes,
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}
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}
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func init() {
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gob.Register(peerId{})
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}
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type peerId struct {
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*Peer
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ptr uintptr
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}
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func (p peerId) Uintptr() uintptr {
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return p.ptr
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}
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func (p peerId) GobEncode() (b []byte, _ error) {
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*(*reflect.SliceHeader)(unsafe.Pointer(&b)) = reflect.SliceHeader{
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Data: uintptr(unsafe.Pointer(&p.ptr)),
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Len: int(unsafe.Sizeof(p.ptr)),
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Cap: int(unsafe.Sizeof(p.ptr)),
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}
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return
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}
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func (p *peerId) GobDecode(b []byte) error {
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if uintptr(len(b)) != unsafe.Sizeof(p.ptr) {
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panic(len(b))
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}
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ptr := unsafe.Pointer(&b[0])
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p.ptr = *(*uintptr)(ptr)
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log.Printf("%p", ptr)
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dst := reflect.SliceHeader{
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Data: uintptr(unsafe.Pointer(&p.Peer)),
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Len: int(unsafe.Sizeof(p.Peer)),
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Cap: int(unsafe.Sizeof(p.Peer)),
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}
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copy(*(*[]byte)(unsafe.Pointer(&dst)), b)
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return nil
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}
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type RequestIndex = request_strategy.RequestIndex
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type chunkIndexType = request_strategy.ChunkIndex
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type peerRequests struct {
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requestIndexes []RequestIndex
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peer *Peer
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torrentStrategyInput request_strategy.Torrent
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}
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func (p *peerRequests) Len() int {
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return len(p.requestIndexes)
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}
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func (p *peerRequests) Less(i, j int) bool {
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leftRequest := p.requestIndexes[i]
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rightRequest := p.requestIndexes[j]
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t := p.peer.t
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leftPieceIndex := leftRequest / p.torrentStrategyInput.ChunksPerPiece
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rightPieceIndex := rightRequest / p.torrentStrategyInput.ChunksPerPiece
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leftCurrent := p.peer.actualRequestState.Requests.Contains(leftRequest)
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rightCurrent := p.peer.actualRequestState.Requests.Contains(rightRequest)
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pending := func(index RequestIndex, current bool) int {
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ret := t.pendingRequests.Get(index)
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if current {
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ret--
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}
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// I have a hunch that this could trigger for requests for chunks that are choked and not
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// allowed fast, since the current conn shouldn't already be included. It's a very specific
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// circumstance, and if it triggers I will fix it.
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if ret < 0 {
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panic(ret)
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}
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return ret
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}
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ml := multiless.New()
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// Push requests that can't be served right now to the end. But we don't throw them away unless
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// there's a better alternative. This is for when we're using the fast extension and get choked
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// but our requests could still be good when we get unchoked.
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if p.peer.peerChoking {
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ml = ml.Bool(
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!p.peer.peerAllowedFast.Contains(leftPieceIndex),
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!p.peer.peerAllowedFast.Contains(rightPieceIndex),
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)
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}
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ml = ml.Int(
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pending(leftRequest, leftCurrent),
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pending(rightRequest, rightCurrent))
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ml = ml.Bool(!leftCurrent, !rightCurrent)
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ml = ml.Int(
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-int(p.torrentStrategyInput.Pieces[leftPieceIndex].Priority),
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-int(p.torrentStrategyInput.Pieces[rightPieceIndex].Priority),
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)
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ml = ml.Int(
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int(p.torrentStrategyInput.Pieces[leftPieceIndex].Availability),
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int(p.torrentStrategyInput.Pieces[rightPieceIndex].Availability))
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ml = ml.Uint32(leftPieceIndex, rightPieceIndex)
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ml = ml.Uint32(leftRequest, rightRequest)
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return ml.MustLess()
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}
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func (p *peerRequests) Swap(i, j int) {
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p.requestIndexes[i], p.requestIndexes[j] = p.requestIndexes[j], p.requestIndexes[i]
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}
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func (p *peerRequests) Push(x interface{}) {
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p.requestIndexes = append(p.requestIndexes, x.(RequestIndex))
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}
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func (p *peerRequests) Pop() interface{} {
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last := len(p.requestIndexes) - 1
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x := p.requestIndexes[last]
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p.requestIndexes = p.requestIndexes[:last]
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return x
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}
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func (p *Peer) getDesiredRequestState() (desired requestState) {
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input := p.t.cl.getRequestStrategyInput()
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requestHeap := peerRequests{
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peer: p,
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}
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for _, t := range input.Torrents {
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if t.InfoHash == p.t.infoHash {
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requestHeap.torrentStrategyInput = t
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break
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}
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}
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request_strategy.GetRequestablePieces(
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input,
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func(t *request_strategy.Torrent, rsp *request_strategy.Piece, pieceIndex int) {
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if t.InfoHash != p.t.infoHash {
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return
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}
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if !p.peerHasPiece(pieceIndex) {
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return
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}
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allowedFast := p.peerAllowedFast.ContainsInt(pieceIndex)
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rsp.IterPendingChunks.Iter(func(ci request_strategy.ChunkIndex) {
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if !allowedFast {
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// We must signal interest to request this..
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desired.Interested = true
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if p.peerChoking && !p.actualRequestState.Requests.Contains(ci) {
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// We can't request this right now.
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return
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}
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}
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requestHeap.requestIndexes = append(
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requestHeap.requestIndexes,
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p.t.pieceRequestIndexOffset(pieceIndex)+ci)
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})
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},
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)
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heap.Init(&requestHeap)
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for requestHeap.Len() != 0 && desired.Requests.GetCardinality() < uint64(p.nominalMaxRequests()) {
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requestIndex := heap.Pop(&requestHeap).(RequestIndex)
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desired.Requests.Add(requestIndex)
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}
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return
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}
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func (p *Peer) applyNextRequestState() bool {
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if p.needRequestUpdate == "" {
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return true
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}
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var more bool
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pprof.Do(
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context.Background(),
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pprof.Labels("update request", p.needRequestUpdate),
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func(_ context.Context) {
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next := p.getDesiredRequestState()
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more = p.applyRequestState(next)
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},
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)
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return more
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}
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func (p *Peer) applyRequestState(next requestState) bool {
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current := &p.actualRequestState
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if !p.setInterested(next.Interested) {
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return false
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}
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more := true
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cancel := roaring.AndNot(¤t.Requests, &next.Requests)
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cancel.Iterate(func(req uint32) bool {
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more = p.cancel(req)
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return more
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})
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if !more {
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return false
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}
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for _, x := range rand.Perm(int(next.Requests.GetCardinality())) {
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req, err := next.Requests.Select(uint32(x))
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if err != nil {
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panic(err)
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}
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if p.cancelledRequests.Contains(req) {
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// Waiting for a reject or piece message, which will suitably trigger us to update our
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// requests, so we can skip this one with no additional consideration.
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continue
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}
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if maxRequests(current.Requests.GetCardinality()) >= p.nominalMaxRequests() {
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//log.Printf("not assigning all requests [desired=%v, cancelled=%v, current=%v, max=%v]",
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// next.Requests.GetCardinality(),
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// p.cancelledRequests.GetCardinality(),
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// current.Requests.GetCardinality(),
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// p.nominalMaxRequests(),
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//)
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break
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}
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more, err = p.request(req)
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if err != nil {
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panic(err)
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}
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if !more {
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break
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}
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}
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p.updateRequestsTimer.Stop()
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if more {
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p.needRequestUpdate = ""
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if !current.Requests.IsEmpty() {
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p.updateRequestsTimer.Reset(3 * time.Second)
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}
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}
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return more
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}
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