mirror of
https://github.com/prometheus/node_exporter.git
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54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// +build !nontp
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package collector
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import (
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"flag"
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"fmt"
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"time"
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"github.com/beevik/ntp"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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ntpServer = flag.String("ntpServer", "", "NTP server to use for ntp collector.")
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)
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type ntpCollector struct {
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drift prometheus.Gauge
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}
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func init() {
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Factories["ntp"] = NewNtpCollector
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}
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// Takes a config struct and prometheus registry and returns a new Collector exposing
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// the offset between ntp and the current system time.
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func NewNtpCollector(config Config) (Collector, error) {
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if *ntpServer == "" {
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return nil, fmt.Errorf("No NTP server specifies, see --ntpServer")
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}
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return &ntpCollector{
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drift: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "ntp_drift_seconds",
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Help: "Time between system time and ntp time.",
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}),
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}, nil
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}
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func (c *ntpCollector) Update(ch chan<- prometheus.Metric) (err error) {
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t, err := ntp.Time(*ntpServer)
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if err != nil {
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return fmt.Errorf("Couldn't get ntp drift: %s", err)
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}
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drift := t.Sub(time.Now())
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glog.V(1).Infof("Set ntp_drift_seconds: %f", drift.Seconds())
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c.drift.Set(drift.Seconds())
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c.drift.Collect(ch)
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return err
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}
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