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redo kcp.SendingWindow

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This commit is contained in:
Darien Raymond 2018-07-08 21:08:17 +02:00
parent bbeae5be48
commit a8b0660df0
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GPG Key ID: 7251FFA14BB18169
2 changed files with 47 additions and 124 deletions
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129
transport/internet/kcp/sending.go
View File

@ -1,6 +1,7 @@
package kcp
import (
"container/list"
"sync"
"v2ray.com/core/common"
@ -8,31 +9,15 @@ import (
)
type SendingWindow struct {
start uint32
cap uint32
len uint32
last uint32
data []DataSegment
inuse []bool
prev []uint32
next []uint32
cache *list.List
totalInFlightSize uint32
writer SegmentWriter
onPacketLoss func(uint32)
}
func NewSendingWindow(size uint32, writer SegmentWriter, onPacketLoss func(uint32)) *SendingWindow {
func NewSendingWindow(writer SegmentWriter, onPacketLoss func(uint32)) *SendingWindow {
window := &SendingWindow{
start: 0,
cap: size,
len: 0,
last: 0,
data: make([]DataSegment, size),
prev: make([]uint32, size),
next: make([]uint32, size),
inuse: make([]bool, size),
cache: list.New(),
writer: writer,
onPacketLoss: onPacketLoss,
}
@ -43,82 +28,42 @@ func (sw *SendingWindow) Release() {
if sw == nil {
return
}
sw.len = 0
for _, seg := range sw.data {
for sw.cache.Len() > 0 {
seg := sw.cache.Front().Value.(*DataSegment)
seg.Release()
sw.cache.Remove(sw.cache.Front())
}
}
func (sw *SendingWindow) Len() int {
return int(sw.len)
func (sw *SendingWindow) Len() uint32 {
return uint32(sw.cache.Len())
}
func (sw *SendingWindow) IsEmpty() bool {
return sw.len == 0
}
func (sw *SendingWindow) Size() uint32 {
return sw.cap
}
func (sw *SendingWindow) IsFull() bool {
return sw.len == sw.cap
return sw.cache.Len() == 0
}
func (sw *SendingWindow) Push(number uint32) *buf.Buffer {
pos := (sw.start + sw.len) % sw.cap
sw.data[pos].Number = number
sw.data[pos].timeout = 0
sw.data[pos].transmit = 0
sw.inuse[pos] = true
if sw.len > 0 {
sw.next[sw.last] = pos
sw.prev[pos] = sw.last
}
sw.last = pos
sw.len++
return sw.data[pos].Data()
seg := NewDataSegment()
seg.Number = number
sw.cache.PushBack(seg)
return seg.Data()
}
func (sw *SendingWindow) FirstNumber() uint32 {
return sw.data[sw.start].Number
return sw.cache.Front().Value.(*DataSegment).Number
}
func (sw *SendingWindow) Clear(una uint32) {
for !sw.IsEmpty() && sw.data[sw.start].Number < una {
sw.Remove(0)
for !sw.IsEmpty() {
seg := sw.cache.Front().Value.(*DataSegment)
if seg.Number >= una {
break
}
}
func (sw *SendingWindow) Remove(idx uint32) bool {
if sw.IsEmpty() {
return false
seg.Release()
sw.cache.Remove(sw.cache.Front())
}
pos := (sw.start + idx) % sw.cap
if !sw.inuse[pos] {
return false
}
sw.inuse[pos] = false
sw.totalInFlightSize--
if pos == sw.start && pos == sw.last {
sw.len = 0
sw.start = 0
sw.last = 0
} else if pos == sw.start {
delta := sw.next[pos] - sw.start
if sw.next[pos] < sw.start {
delta = sw.next[pos] + sw.cap - sw.start
}
sw.start = sw.next[pos]
sw.len -= delta
} else if pos == sw.last {
sw.last = sw.prev[pos]
} else {
sw.next[sw.prev[pos]] = sw.next[pos]
sw.prev[sw.next[pos]] = sw.prev[pos]
}
return true
}
func (sw *SendingWindow) HandleFastAck(number uint32, rto uint32) {
@ -143,8 +88,9 @@ func (sw *SendingWindow) Visit(visitor func(seg *DataSegment) bool) {
return
}
for i := sw.start; ; i = sw.next[i] {
if !visitor(&sw.data[i]) || i == sw.last {
for e := sw.cache.Front(); e != nil; e = e.Next() {
seg := e.Value.(*DataSegment)
if !visitor(seg) {
break
}
}
@ -186,6 +132,23 @@ func (sw *SendingWindow) Flush(current uint32, rto uint32, maxInFlightSize uint3
}
}
func (sw *SendingWindow) Remove(number uint32) bool {
if sw.IsEmpty() {
return false
}
for e := sw.cache.Front(); e != nil; e = e.Next() {
seg := e.Value.(*DataSegment)
if seg.Number > number {
return false
} else if seg.Number == number {
return true
}
}
return false
}
type SendingWorker struct {
sync.RWMutex
conn *Connection
@ -195,6 +158,7 @@ type SendingWorker struct {
remoteNextNumber uint32
controlWindow uint32
fastResend uint32
windowSize uint32
firstUnacknowledgedUpdated bool
closed bool
}
@ -205,8 +169,9 @@ func NewSendingWorker(kcp *Connection) *SendingWorker {
fastResend: 2,
remoteNextNumber: 32,
controlWindow: kcp.Config.GetSendingInFlightSize(),
windowSize: kcp.Config.GetSendingBufferSize(),
}
worker.window = NewSendingWindow(kcp.Config.GetSendingBufferSize(), worker, worker.OnPacketLoss)
worker.window = NewSendingWindow(worker, worker.OnPacketLoss)
return worker
}
@ -247,7 +212,7 @@ func (w *SendingWorker) processAck(number uint32) bool {
return false
}
removed := w.window.Remove(number - w.firstUnacknowledged)
removed := w.window.Remove(number)
if removed {
w.FindFirstUnacknowledged()
}
@ -299,7 +264,7 @@ func (w *SendingWorker) Push(f buf.Supplier) bool {
return false
}
if w.window.IsFull() {
if w.window.Len() > w.windowSize {
return false
}

42
transport/internet/kcp/sending_test.go
View File

@ -1,42 +0,0 @@
package kcp_test
import (
"testing"
. "v2ray.com/core/transport/internet/kcp"
. "v2ray.com/ext/assert"
)
func TestSendingWindow(t *testing.T) {
assert := With(t)
window := NewSendingWindow(5, nil, nil)
window.Push(0)
window.Push(1)
window.Push(2)
assert(window.Len(), Equals, 3)
window.Remove(1)
assert(window.Len(), Equals, 3)
assert(window.FirstNumber(), Equals, uint32(0))
window.Remove(0)
assert(window.Len(), Equals, 1)
assert(window.FirstNumber(), Equals, uint32(2))
window.Remove(0)
assert(window.Len(), Equals, 0)
window.Push(4)
assert(window.Len(), Equals, 1)
assert(window.FirstNumber(), Equals, uint32(4))
window.Push(5)
assert(window.Len(), Equals, 2)
window.Remove(1)
assert(window.Len(), Equals, 2)
window.Remove(0)
assert(window.Len(), Equals, 0)
}