304 lines
7.0 KiB
Go
304 lines
7.0 KiB
Go
package kcp
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import (
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"bytes"
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"container/list"
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"encoding/binary"
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"fmt"
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"math/rand"
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"sync"
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"testing"
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"time"
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)
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func iclock() int32 {
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return int32((time.Now().UnixNano() / 1000000) & 0xffffffff)
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}
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type DelayPacket struct {
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_ptr []byte
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_size int
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_ts int32
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}
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func (p *DelayPacket) Init(size int, src []byte) {
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p._ptr = make([]byte, size)
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p._size = size
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copy(p._ptr, src[:size])
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}
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func (p *DelayPacket) ptr() []byte { return p._ptr }
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func (p *DelayPacket) size() int { return p._size }
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func (p *DelayPacket) ts() int32 { return p._ts }
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func (p *DelayPacket) setts(ts int32) { p._ts = ts }
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type DelayTunnel struct{ *list.List }
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type Random *rand.Rand
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type LatencySimulator struct {
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current int32
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lostrate, rttmin, rttmax, nmax int
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p12 DelayTunnel
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p21 DelayTunnel
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r12 *rand.Rand
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r21 *rand.Rand
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}
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// lostrate: 往返一周丢包率的百分比，默认 10%
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// rttmin：rtt最小值，默认 60
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// rttmax：rtt最大值，默认 125
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//func (p *LatencySimulator)Init(int lostrate = 10, int rttmin = 60, int rttmax = 125, int nmax = 1000):
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func (p *LatencySimulator) Init(lostrate, rttmin, rttmax, nmax int) {
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p.r12 = rand.New(rand.NewSource(9))
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p.r21 = rand.New(rand.NewSource(99))
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p.p12 = DelayTunnel{list.New()}
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p.p21 = DelayTunnel{list.New()}
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p.current = iclock()
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p.lostrate = lostrate / 2 // 上面数据是往返丢包率，单程除以2
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p.rttmin = rttmin / 2
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p.rttmax = rttmax / 2
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p.nmax = nmax
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}
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// 发送数据
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// peer - 端点0/1，从0发送，从1接收；从1发送从0接收
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func (p *LatencySimulator) send(peer int, data []byte, size int) int {
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rnd := 0
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if peer == 0 {
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rnd = p.r12.Intn(100)
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} else {
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rnd = p.r21.Intn(100)
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}
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//println("!!!!!!!!!!!!!!!!!!!!", rnd, p.lostrate, peer)
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if rnd < p.lostrate {
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return 0
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}
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pkt := &DelayPacket{}
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pkt.Init(size, data)
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p.current = iclock()
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delay := p.rttmin
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if p.rttmax > p.rttmin {
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delay += rand.Int() % (p.rttmax - p.rttmin)
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}
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pkt.setts(p.current + int32(delay))
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if peer == 0 {
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p.p12.PushBack(pkt)
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} else {
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p.p21.PushBack(pkt)
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}
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return 1
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}
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// 接收数据
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func (p *LatencySimulator) recv(peer int, data []byte, maxsize int) int32 {
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var it *list.Element
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if peer == 0 {
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it = p.p21.Front()
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if p.p21.Len() == 0 {
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return -1
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}
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} else {
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it = p.p12.Front()
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if p.p12.Len() == 0 {
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return -1
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}
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}
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pkt := it.Value.(*DelayPacket)
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p.current = iclock()
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if p.current < pkt.ts() {
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return -2
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}
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if maxsize < pkt.size() {
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return -3
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}
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if peer == 0 {
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p.p21.Remove(it)
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} else {
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p.p12.Remove(it)
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}
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maxsize = pkt.size()
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copy(data, pkt.ptr()[:maxsize])
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return int32(maxsize)
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}
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//=====================================================================
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//=====================================================================
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// 模拟网络
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var vnet *LatencySimulator
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// 测试用例
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func test(mode int) {
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// 创建模拟网络：丢包率10%，Rtt 60ms~125ms
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vnet = &LatencySimulator{}
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vnet.Init(10, 60, 125, 1000)
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// 创建两个端点的 kcp对象，第一个参数 conv是会话编号，同一个会话需要相同
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// 最后一个是 user参数，用来传递标识
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output1 := func(buf []byte, size int) {
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if vnet.send(0, buf, size) != 1 {
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}
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}
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output2 := func(buf []byte, size int) {
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if vnet.send(1, buf, size) != 1 {
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}
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}
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kcp1 := NewKCP(0x11223344, output1)
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kcp2 := NewKCP(0x11223344, output2)
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current := uint32(iclock())
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slap := current + 20
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index := 0
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next := 0
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var sumrtt uint32
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count := 0
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maxrtt := 0
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// 配置窗口大小：平均延迟200ms，每20ms发送一个包，
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// 而考虑到丢包重发，设置最大收发窗口为128
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kcp1.WndSize(128, 128)
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kcp2.WndSize(128, 128)
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// 判断测试用例的模式
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if mode == 0 {
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// 默认模式
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kcp1.NoDelay(0, 10, 0, 0)
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kcp2.NoDelay(0, 10, 0, 0)
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} else if mode == 1 {
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// 普通模式，关闭流控等
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kcp1.NoDelay(0, 10, 0, 1)
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kcp2.NoDelay(0, 10, 0, 1)
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} else {
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// 启动快速模式
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// 第二个参数 nodelay-启用以后若干常规加速将启动
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// 第三个参数 interval为内部处理时钟，默认设置为 10ms
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// 第四个参数 resend为快速重传指标，设置为2
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// 第五个参数 为是否禁用常规流控，这里禁止
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kcp1.NoDelay(1, 10, 2, 1)
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kcp2.NoDelay(1, 10, 2, 1)
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}
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buffer := make([]byte, 2000)
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var hr int32
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ts1 := iclock()
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for {
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time.Sleep(1 * time.Millisecond)
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current = uint32(iclock())
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kcp1.Update()
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kcp2.Update()
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// 每隔 20ms，kcp1发送数据
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for ; current >= slap; slap += 20 {
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buf := new(bytes.Buffer)
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binary.Write(buf, binary.LittleEndian, uint32(index))
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index++
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binary.Write(buf, binary.LittleEndian, uint32(current))
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// 发送上层协议包
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kcp1.Send(buf.Bytes())
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//println("now", iclock())
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}
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// 处理虚拟网络：检测是否有udp包从p1->p2
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for {
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hr = vnet.recv(1, buffer, 2000)
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if hr < 0 {
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break
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}
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// 如果 p2收到udp，则作为下层协议输入到kcp2
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kcp2.Input(buffer[:hr], true, false)
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}
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// 处理虚拟网络：检测是否有udp包从p2->p1
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for {
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hr = vnet.recv(0, buffer, 2000)
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if hr < 0 {
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break
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}
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// 如果 p1收到udp，则作为下层协议输入到kcp1
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kcp1.Input(buffer[:hr], true, false)
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//println("@@@@", hr, r)
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}
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// kcp2接收到任何包都返回回去
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for {
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hr = int32(kcp2.Recv(buffer[:10]))
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// 没有收到包就退出
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if hr < 0 {
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break
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}
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// 如果收到包就回射
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buf := bytes.NewReader(buffer)
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var sn uint32
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binary.Read(buf, binary.LittleEndian, &sn)
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kcp2.Send(buffer[:hr])
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}
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// kcp1收到kcp2的回射数据
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for {
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hr = int32(kcp1.Recv(buffer[:10]))
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buf := bytes.NewReader(buffer)
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// 没有收到包就退出
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if hr < 0 {
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break
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}
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var sn uint32
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var ts, rtt uint32
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binary.Read(buf, binary.LittleEndian, &sn)
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binary.Read(buf, binary.LittleEndian, &ts)
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rtt = uint32(current) - ts
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if sn != uint32(next) {
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// 如果收到的包不连续
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//for i:=0;i<8 ;i++ {
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//println("---", i, buffer[i])
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//}
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println("ERROR sn ", count, "<->", next, sn)
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return
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}
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next++
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sumrtt += rtt
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count++
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if rtt > uint32(maxrtt) {
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maxrtt = int(rtt)
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}
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//println("[RECV] mode=", mode, " sn=", sn, " rtt=", rtt)
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}
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if next > 100 {
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break
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}
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}
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ts1 = iclock() - ts1
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names := []string{"default", "normal", "fast"}
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fmt.Printf("%s mode result (%dms):\n", names[mode], ts1)
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fmt.Printf("avgrtt=%d maxrtt=%d\n", int(sumrtt/uint32(count)), maxrtt)
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}
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func TestNetwork(t *testing.T) {
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test(0) // 默认模式，类似 TCP：正常模式，无快速重传，常规流控
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test(1) // 普通模式，关闭流控等
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test(2) // 快速模式，所有开关都打开，且关闭流控
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}
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func BenchmarkFlush(b *testing.B) {
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kcp := NewKCP(1, func(buf []byte, size int) {})
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kcp.snd_buf = make([]segment, 32)
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for k := range kcp.snd_buf {
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kcp.snd_buf[k].xmit = 1
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kcp.snd_buf[k].resendts = currentMs() + 10000
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}
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b.ResetTimer()
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b.ReportAllocs()
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var mu sync.Mutex
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for i := 0; i < b.N; i++ {
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mu.Lock()
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kcp.flush(false)
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mu.Unlock()
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}
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}
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