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probe.go
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probe.go
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package main
import (
"fmt"
"log"
"strings"
"time"
)
type Probe struct {
Servers []*Server
Interval time.Duration
fastestServer *Server
}
type Server struct {
Address string
P *pinger
Stat *Stat
Scorer Scorer
}
func (s *Server) String() string {
return fmt.Sprintf("server:%s stats in recent %d pings:average latency:%s package drop rate:%f%%", s.P.Address, s.Stat.Count, s.Stat.AverageLatency().String(), s.Stat.DropRate()*100)
}
func (p *Probe) GetFastestServer() string {
return p.fastestServer.Address
}
func (p *Probe) getFastestServer() *Server {
max := p.Servers[0]
//stat := p.Servers[0].Stat
maxscore := p.Servers[0].Scorer.Score()
for _, v := range p.Servers {
debugOut(v)
if score := v.Scorer.Score(); score > maxscore {
maxscore = score
max = v
}
}
debugOut("max:", max.Address)
return max
}
func NewProbe(config *Config) *Probe {
p := new(Probe)
length := len(config.Servers)
if length <= 0 {
log.Fatal("server list empty")
}
p.Servers = make([]*Server, length)
var version ICMPVersion
if config.IPv6 {
version = ICMPv6
} else {
version = ICMPv4
}
p.Interval = time.Duration(config.Interval) * time.Millisecond
for i, v := range config.Servers {
addr := CutPort(v)
p.Servers[i] = &Server{
Address: v,
P: NewPinger(addr, config.Timeout, config.PayloadSize, version),
Stat: NewStat(config.HistorySize, nil),
}
if config.Lua == "" {
p.Servers[i].Scorer = NewDefaultScorer(p.Servers[i])
} else {
var err error
p.Servers[i].Scorer, err = NewLuaScorer(p.Servers[i], config.Lua)
if err != nil {
log.Fatal(err)
}
}
}
p.fastestServer = p.Servers[0]
return p
}
func CutPort(addr string) string {
return strings.Split(addr, ":")[0]
}
func (p *Probe) Start() {
go func() {
for {
p.fastestServer = p.getFastestServer()
time.Sleep(time.Second)
}
}()
for _, v := range p.Servers {
go func(v *Server) {
ticker := time.Tick(p.Interval)
for _ = range ticker {
go func() {
latency, err := v.P.Ping()
v.Stat.AddResult(latency, err != nil)
}()
}
}(v)
}
}