mirror of
https://github.com/KusakabeShi/EtherGuard-VPN.git
synced 2024-11-28 10:13:07 +01:00
315 lines
7.7 KiB
Go
315 lines
7.7 KiB
Go
package path
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import (
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"fmt"
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"math"
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"sync"
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"time"
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"github.com/KusakabeSi/EtherGuardVPN/config"
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yaml "gopkg.in/yaml.v2"
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)
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const Infinity = float64(99999)
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func (g *IG) GetCurrentTime() time.Time {
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return time.Now().Round(0)
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}
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// A Graph is the interface implemented by graphs that
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// this algorithm can run on.
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type Graph interface {
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Vertices() map[config.Vertex]bool
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Neighbors(v config.Vertex) []config.Vertex
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Weight(u, v config.Vertex) float64
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}
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type Latency struct {
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ping float64
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time time.Time
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}
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type Fullroute struct {
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Dist config.DistTable `json:"total distance"`
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Next config.NextHopTable `json:"next hop"`
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}
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// IG is a graph of integers that satisfies the Graph interface.
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type IG struct {
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Vert map[config.Vertex]bool
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edges map[config.Vertex]map[config.Vertex]Latency
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edgelock *sync.RWMutex
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JitterTolerance float64
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JitterToleranceMultiplier float64
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NodeReportTimeout time.Duration
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SuperNodeInfoTimeout time.Duration
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RecalculateCoolDown time.Duration
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RecalculateTime time.Time
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dlTable config.DistTable
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nhTable config.NextHopTable
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NhTableHash [32]byte
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NhTableExpire time.Time
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IsSuperMode bool
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}
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func S2TD(secs float64) time.Duration {
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return time.Duration(secs * float64(time.Second))
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}
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func NewGraph(num_node int, IsSuperMode bool, theconfig config.GraphRecalculateSetting) *IG {
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g := IG{
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edgelock: &sync.RWMutex{},
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JitterTolerance: theconfig.JitterTolerance,
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JitterToleranceMultiplier: theconfig.JitterToleranceMultiplier,
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NodeReportTimeout: S2TD(theconfig.NodeReportTimeout),
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RecalculateCoolDown: S2TD(theconfig.RecalculateCoolDown),
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}
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g.Vert = make(map[config.Vertex]bool, num_node)
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g.edges = make(map[config.Vertex]map[config.Vertex]Latency, num_node)
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g.IsSuperMode = IsSuperMode
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return &g
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}
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func (g *IG) GetWeightType(x float64) (y float64) {
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x = math.Abs(x)
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y = x
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if g.JitterTolerance > 0.001 && g.JitterToleranceMultiplier > 1 {
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t := g.JitterTolerance
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r := g.JitterToleranceMultiplier
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y = math.Pow(math.Ceil(math.Pow(x/t, 1/r)), r) * t
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}
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return y
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}
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func (g *IG) ShouldUpdate(u config.Vertex, v config.Vertex, newval float64) bool {
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oldval := math.Abs(g.Weight(u, v) * 1000)
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newval = math.Abs(newval * 1000)
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if g.IsSuperMode {
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if g.JitterTolerance > 0.001 && g.JitterToleranceMultiplier >= 1 {
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diff := math.Abs(newval - oldval)
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x := math.Max(oldval, newval)
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t := g.JitterTolerance
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r := g.JitterToleranceMultiplier
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return diff > t+x*(r-1) // https://www.desmos.com/calculator/raoti16r5n
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}
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return oldval == newval
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} else {
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return g.GetWeightType(oldval) == g.GetWeightType(newval)
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}
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}
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func (g *IG) RecalculateNhTable(checkchange bool) (changed bool) {
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if g.RecalculateTime.Add(g.RecalculateCoolDown).Before(time.Now()) {
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dist, next := FloydWarshall(g)
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changed = false
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if checkchange {
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CheckLoop:
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for src, dsts := range next {
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for dst, old_next := range dsts {
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nexthop := g.Next(src, dst)
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if old_next != nexthop {
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changed = true
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break CheckLoop
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}
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}
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}
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}
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g.dlTable, g.nhTable = dist, next
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g.NhTableExpire = time.Now().Add(g.NodeReportTimeout)
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g.RecalculateTime = time.Now()
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}
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return
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}
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func (g *IG) UpdateLentancy(u, v config.Vertex, dt time.Duration, checkchange bool) (changed bool) {
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g.edgelock.Lock()
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g.Vert[u] = true
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g.Vert[v] = true
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w := float64(dt) / float64(time.Second)
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if _, ok := g.edges[u]; !ok {
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g.edges[u] = make(map[config.Vertex]Latency)
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}
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g.edges[u][v] = Latency{
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ping: w,
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time: time.Now(),
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}
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g.edgelock.Unlock()
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if g.ShouldUpdate(u, v, w) {
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changed = g.RecalculateNhTable(checkchange)
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}
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return
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}
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func (g IG) Vertices() map[config.Vertex]bool {
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vr := make(map[config.Vertex]bool)
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g.edgelock.RLock()
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defer g.edgelock.RUnlock()
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for k, v := range g.Vert { //copy a new list
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vr[k] = v
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}
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return vr
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}
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func (g IG) Neighbors(v config.Vertex) (vs []config.Vertex) {
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g.edgelock.RLock()
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defer g.edgelock.RUnlock()
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for k := range g.edges[v] { //copy a new list
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vs = append(vs, k)
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}
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return vs
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}
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func (g IG) Next(u, v config.Vertex) *config.Vertex {
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if _, ok := g.nhTable[u]; !ok {
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return nil
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}
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if _, ok := g.nhTable[u][v]; !ok {
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return nil
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}
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return g.nhTable[u][v]
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}
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func (g IG) Weight(u, v config.Vertex) float64 {
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g.edgelock.RLock()
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defer g.edgelock.RUnlock()
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if _, ok := g.edges[u]; !ok {
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g.edgelock.RUnlock()
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g.edgelock.Lock()
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g.edges[u] = make(map[config.Vertex]Latency)
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g.edgelock.Unlock()
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g.edgelock.RLock()
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return Infinity
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}
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if _, ok := g.edges[u][v]; !ok {
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return Infinity
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}
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if time.Now().After(g.edges[u][v].time.Add(g.NodeReportTimeout)) {
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return Infinity
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}
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return g.edges[u][v].ping
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}
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func FloydWarshall(g Graph) (dist config.DistTable, next config.NextHopTable) {
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vert := g.Vertices()
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dist = make(config.DistTable)
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next = make(config.NextHopTable)
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for u, _ := range vert {
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dist[u] = make(map[config.Vertex]float64)
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next[u] = make(map[config.Vertex]*config.Vertex)
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for v, _ := range vert {
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dist[u][v] = Infinity
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}
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dist[u][u] = 0
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for _, v := range g.Neighbors(u) {
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w := g.Weight(u, v)
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if w < Infinity {
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v := v
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dist[u][v] = w
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next[u][v] = &v
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}
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}
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}
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for k, _ := range vert {
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for i, _ := range vert {
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for j, _ := range vert {
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if dist[i][k] < Infinity && dist[k][j] < Infinity {
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if dist[i][j] > dist[i][k]+dist[k][j] {
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dist[i][j] = dist[i][k] + dist[k][j]
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next[i][j] = next[i][k]
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}
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}
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}
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}
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}
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return dist, next
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}
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func Path(u, v config.Vertex, next config.NextHopTable) (path []config.Vertex) {
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if next[u][v] == nil {
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return []config.Vertex{}
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}
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path = []config.Vertex{u}
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for u != v {
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u = *next[u][v]
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path = append(path, u)
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}
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return path
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}
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func (g *IG) SetNHTable(nh config.NextHopTable, table_hash [32]byte) { // set nhTable from supernode
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g.nhTable = nh
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g.NhTableHash = table_hash
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g.NhTableExpire = time.Now().Add(g.SuperNodeInfoTimeout)
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}
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func (g *IG) GetNHTable(checkChange bool) config.NextHopTable {
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if time.Now().After(g.NhTableExpire) {
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g.RecalculateNhTable(checkChange)
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}
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return g.nhTable
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}
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func (g *IG) GetDtst() config.DistTable {
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return g.dlTable
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}
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func (g *IG) GetEdges() (edges map[config.Vertex]map[config.Vertex]float64) {
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vert := g.Vertices()
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edges = make(map[config.Vertex]map[config.Vertex]float64, len(vert))
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for src, _ := range vert {
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edges[src] = make(map[config.Vertex]float64, len(vert))
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for dst, _ := range vert {
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if src != dst {
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edges[src][dst] = g.Weight(src, dst)
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}
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}
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}
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return
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}
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func (g *IG) GetBoardcastList(id config.Vertex) (tosend map[config.Vertex]bool) {
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tosend = make(map[config.Vertex]bool)
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for _, element := range g.nhTable[id] {
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tosend[*element] = true
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}
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return
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}
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func (g *IG) GetBoardcastThroughList(self_id config.Vertex, in_id config.Vertex, src_id config.Vertex) (tosend map[config.Vertex]bool) {
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tosend = make(map[config.Vertex]bool)
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for check_id, _ := range g.GetBoardcastList(self_id) {
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for _, path_node := range Path(src_id, check_id, g.nhTable) {
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if path_node == self_id && check_id != in_id {
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tosend[check_id] = true
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continue
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}
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}
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}
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return
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}
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func Solve() {
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var g IG
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//g.Init()
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g.UpdateLentancy(1, 2, S2TD(0.5), false)
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g.UpdateLentancy(2, 1, S2TD(0.5), false)
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g.UpdateLentancy(2, 3, S2TD(2), false)
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g.UpdateLentancy(3, 2, S2TD(2), false)
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g.UpdateLentancy(2, 4, S2TD(0.7), false)
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g.UpdateLentancy(4, 2, S2TD(2), false)
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dist, next := FloydWarshall(g)
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fmt.Println("pair\tdist\tpath")
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for u, m := range dist {
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for v, d := range m {
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if u != v {
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fmt.Printf("%d -> %d\t%3f\t%s\n", u, v, d, fmt.Sprint(Path(u, v, next)))
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}
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}
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}
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fmt.Print("Finish")
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rr, _ := yaml.Marshal(Fullroute{
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Dist: dist,
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Next: next,
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})
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fmt.Print(string(rr))
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}
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