mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-05 19:44:32 -04:00
216 lines
4.4 KiB
Go
216 lines
4.4 KiB
Go
package kcp
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import (
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"sync"
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"v2ray.com/core/common/alloc"
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)
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type ReceivingWindow struct {
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start uint32
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size uint32
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list []*DataSegment
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}
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func NewReceivingWindow(size uint32) *ReceivingWindow {
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return &ReceivingWindow{
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start: 0,
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size: size,
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list: make([]*DataSegment, size),
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}
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}
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func (this *ReceivingWindow) Size() uint32 {
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return this.size
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}
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func (this *ReceivingWindow) Position(idx uint32) uint32 {
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return (idx + this.start) % this.size
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}
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func (this *ReceivingWindow) Set(idx uint32, value *DataSegment) bool {
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pos := this.Position(idx)
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if this.list[pos] != nil {
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return false
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}
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this.list[pos] = value
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return true
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}
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func (this *ReceivingWindow) Remove(idx uint32) *DataSegment {
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pos := this.Position(idx)
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e := this.list[pos]
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this.list[pos] = nil
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return e
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}
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func (this *ReceivingWindow) RemoveFirst() *DataSegment {
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return this.Remove(0)
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}
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func (this *ReceivingWindow) Advance() {
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this.start++
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if this.start == this.size {
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this.start = 0
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}
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}
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type AckList struct {
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writer SegmentWriter
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timestamps []uint32
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numbers []uint32
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nextFlush []uint32
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}
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func NewAckList(writer SegmentWriter) *AckList {
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return &AckList{
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writer: writer,
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timestamps: make([]uint32, 0, 32),
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numbers: make([]uint32, 0, 32),
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nextFlush: make([]uint32, 0, 32),
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}
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}
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func (this *AckList) Add(number uint32, timestamp uint32) {
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this.timestamps = append(this.timestamps, timestamp)
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this.numbers = append(this.numbers, number)
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this.nextFlush = append(this.nextFlush, 0)
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}
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func (this *AckList) Clear(una uint32) {
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count := 0
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for i := 0; i < len(this.numbers); i++ {
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if this.numbers[i] >= una {
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if i != count {
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this.numbers[count] = this.numbers[i]
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this.timestamps[count] = this.timestamps[i]
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this.nextFlush[count] = this.nextFlush[i]
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}
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count++
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}
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}
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if count < len(this.numbers) {
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this.numbers = this.numbers[:count]
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this.timestamps = this.timestamps[:count]
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this.nextFlush = this.nextFlush[:count]
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}
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}
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func (this *AckList) Flush(current uint32, rto uint32) {
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seg := NewAckSegment()
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for i := 0; i < len(this.numbers) && !seg.IsFull(); i++ {
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if this.nextFlush[i] <= current {
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seg.PutNumber(this.numbers[i])
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seg.PutTimestamp(this.timestamps[i])
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this.nextFlush[i] = current + rto/2
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}
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}
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if seg.Count > 0 {
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this.writer.Write(seg)
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seg.Release()
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}
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}
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type ReceivingWorker struct {
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sync.RWMutex
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conn *Connection
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leftOver *alloc.Buffer
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window *ReceivingWindow
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acklist *AckList
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nextNumber uint32
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windowSize uint32
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}
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func NewReceivingWorker(kcp *Connection) *ReceivingWorker {
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worker := &ReceivingWorker{
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conn: kcp,
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window: NewReceivingWindow(kcp.Config.GetReceivingBufferSize()),
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windowSize: kcp.Config.GetReceivingInFlightSize(),
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}
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worker.acklist = NewAckList(worker)
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return worker
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}
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func (this *ReceivingWorker) ProcessSendingNext(number uint32) {
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this.Lock()
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defer this.Unlock()
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this.acklist.Clear(number)
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}
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func (this *ReceivingWorker) ProcessSegment(seg *DataSegment) {
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this.Lock()
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defer this.Unlock()
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number := seg.Number
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idx := number - this.nextNumber
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if idx >= this.windowSize {
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return
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}
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this.acklist.Clear(seg.SendingNext)
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this.acklist.Add(number, seg.Timestamp)
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if !this.window.Set(idx, seg) {
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seg.Release()
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}
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}
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func (this *ReceivingWorker) Read(b []byte) int {
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this.Lock()
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defer this.Unlock()
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total := 0
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if this.leftOver != nil {
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nBytes := copy(b, this.leftOver.Value)
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if nBytes < this.leftOver.Len() {
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this.leftOver.SliceFrom(nBytes)
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return nBytes
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}
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this.leftOver.Release()
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this.leftOver = nil
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total += nBytes
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}
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for total < len(b) {
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seg := this.window.RemoveFirst()
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if seg == nil {
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break
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}
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this.window.Advance()
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this.nextNumber++
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nBytes := copy(b[total:], seg.Data.Value)
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total += nBytes
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if nBytes < seg.Data.Len() {
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seg.Data.SliceFrom(nBytes)
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this.leftOver = seg.Data
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seg.Data = nil
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seg.Release()
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break
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}
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seg.Release()
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}
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return total
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}
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func (this *ReceivingWorker) Flush(current uint32) {
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this.Lock()
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defer this.Unlock()
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this.acklist.Flush(current, this.conn.roundTrip.Timeout())
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}
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func (this *ReceivingWorker) Write(seg Segment) {
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ackSeg := seg.(*AckSegment)
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ackSeg.Conv = this.conn.conv
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ackSeg.ReceivingNext = this.nextNumber
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ackSeg.ReceivingWindow = this.nextNumber + this.windowSize
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if this.conn.state == StateReadyToClose {
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ackSeg.Option = SegmentOptionClose
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}
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this.conn.output.Write(ackSeg)
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}
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func (this *ReceivingWorker) CloseRead() {
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}
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