forked from prometheus/node_exporter
/
ntp.go
53 lines (44 loc) · 1.16 KB
/
ntp.go
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// +build !nontp
package collector
import (
"flag"
"fmt"
"time"
"github.com/beevik/ntp"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/log"
)
var (
ntpServer = flag.String("collector.ntp.server", "", "NTP server to use for ntp collector.")
)
type ntpCollector struct {
drift prometheus.Gauge
}
func init() {
Factories["ntp"] = NewNtpCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// the offset between ntp and the current system time.
func NewNtpCollector() (Collector, error) {
if *ntpServer == "" {
return nil, fmt.Errorf("No NTP server specifies, see --ntpServer")
}
return &ntpCollector{
drift: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: Namespace,
Name: "ntp_drift_seconds",
Help: "Time between system time and ntp time.",
}),
}, nil
}
func (c *ntpCollector) Update(ch chan<- prometheus.Metric) (err error) {
t, err := ntp.Time(*ntpServer)
if err != nil {
return fmt.Errorf("Couldn't get ntp drift: %s", err)
}
drift := t.Sub(time.Now())
log.Debugf("Set ntp_drift_seconds: %f", drift.Seconds())
c.drift.Set(drift.Seconds())
c.drift.Collect(ch)
return err
}