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pingtest.go
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pingtest.go
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package main
//output logs to console or to loggly
//pool output and bulk post every X seconds, default to 10
//json log format:
//TODO
import (
"fmt"
"net"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/grahamgreen/goutils"
"github.com/tatsushid/go-fastping"
"gopkg.in/urfave/cli.v1"
log "github.com/sirupsen/logrus"
)
const (
version = "0.2.0"
step = 1
heartbeat = 2 * step
)
type response struct {
addr *net.IPAddr
rtt time.Duration
}
type host struct {
name string
ip net.IP
}
func main() {
var logfile string
app := cli.NewApp()
app.Version = version
app.Name = "PingTest"
app.Usage = "testing the pings"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "logfile, l",
Value: "/var/log/pingtest.log",
Usage: "Log output to `FILE`",
Destination: &logfile,
},
}
app.Action = func(context *cli.Context) {
f, err := os.OpenFile(logfile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
fmt.Errorf("error opening file: %v", err)
}
defer f.Close()
log.SetFormatter(&log.JSONFormatter{})
log.SetOutput(f)
log.SetLevel(log.InfoLevel)
log.Info("Starting PingTest")
hosts := make(map[string]*host)
for _, val := range context.Args() {
split := strings.Split(val, ":")
theHost := host{}
if len(split) == 1 {
theHost = host{name: split[0], ip: net.ParseIP(split[0])}
} else {
theHost = host{name: split[0], ip: net.ParseIP(split[1])}
}
hosts[theHost.ip.String()] = &theHost
}
results := make(map[string]*response)
rttChan := make(chan *response, 6)
failChan := make(chan *host, 6)
go func() {
for {
select {
case res := <-rttChan:
if host, ok := hosts[res.addr.String()]; ok {
log.WithFields(log.Fields{
"rtt": res.rtt.Seconds(),
"host": host.name,
"fail": 0,
}).Info("success")
}
case host := <-failChan:
log.WithFields(log.Fields{
"rtt": 0,
"host": host.name,
"fail": 1,
}).Info("fail")
}
}
}()
pinger := fastping.NewPinger()
for _, aHost := range hosts {
addr, err := net.ResolveIPAddr("ip4:icmp", aHost.ip.String())
goutils.Check(err)
results[addr.String()] = nil
pinger.AddIPAddr(addr)
}
onRecv, onIdle := make(chan *response), make(chan bool)
pinger.OnRecv = func(addr *net.IPAddr, rtt time.Duration) {
onRecv <- &response{addr: addr, rtt: rtt}
}
pinger.OnIdle = func() {
onIdle <- true
}
pinger.MaxRTT = time.Second
pinger.RunLoop()
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
signal.Notify(c, syscall.SIGTERM)
loop:
for {
select {
case <-c:
log.Debug("Got interrupted; stopping ping test")
break loop
case res := <-onRecv:
if _, ok := results[res.addr.String()]; ok {
results[res.addr.String()] = res
}
case <-onIdle:
for hostIP, r := range results {
if r == nil {
failChan <- hosts[hostIP]
} else {
rttChan <- r
}
}
case <-pinger.Done():
if err := pinger.Err(); err != nil {
fmt.Println("ping failed:", err)
}
break loop
}
}
signal.Stop(c)
pinger.Stop()
}
app.Run(os.Args)
}