/
ping.go
78 lines (74 loc) · 1.4 KB
/
ping.go
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package main
import (
"errors"
"log"
"net"
"strings"
"sync"
)
type PingCheckResult struct {
rtt int64
up bool
err error
}
func IsIPv4(ad string) bool {
return len(ad) > 0 && !strings.Contains(ad, ":")
}
func PingCheck(host string) (rtt int64, up bool, err error) {
var addr []net.IP
addr, err = net.LookupIP(host)
if err != nil {
return -1, false, nil
}
if len(addr) == 0 {
return -1, false, errors.New("host has no A/AAAA records")
}
rtt = -1
up = false
err = nil
for i := uint32(0); i < Config.Checks.PingRetryCount; i++ {
c := make(chan PingCheckResult)
go func() {
var wg sync.WaitGroup
for _, ad := range addr {
if ad != nil {
adstr := ad.String()
if IsIPv4(adstr) {
wg.Add(1)
go func() {
var pingRes PingCheckResult
pingRes.rtt, pingRes.up, pingRes.err = Ping(adstr, true)
c <- pingRes
wg.Done()
}()
} else {
wg.Add(1)
go func() {
var pingRes PingCheckResult
pingRes.rtt, pingRes.up, pingRes.err = Ping(adstr, false)
c <- pingRes
wg.Done()
}()
}
}
}
wg.Wait()
close(c)
}()
for pingRes := range c {
if pingRes.err != nil {
log.Printf("[ERROR] %v", pingRes.err)
} else {
if pingRes.up {
if !up {
up = pingRes.up
rtt = pingRes.rtt
} else if pingRes.rtt < rtt {
rtt = pingRes.rtt
}
}
}
}
}
return
}