node_exporter/collector/time.go

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// +build !notime
package collector
import (
"time"
"github.com/golang/glog"
"github.com/prometheus/client_golang/prometheus"
)
type timeCollector struct {
config Config
metric prometheus.Counter
}
func init() {
Factories["time"] = NewTimeCollector
}
// Takes a config struct and prometheus registry and returns a new Collector exposing
// the current system time in seconds since epoch.
func NewTimeCollector(config Config) (Collector, error) {
return &timeCollector{
config: config,
metric: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: Namespace,
Name: "time",
Help: "System time in seconds since epoch (1970).",
}),
}, nil
}
func (c *timeCollector) Update(ch chan<- prometheus.Metric) (err error) {
now := time.Now()
glog.V(1).Infof("Set time: %f", now.Unix())
c.metric.Set(float64(now.Unix()))
c.metric.Collect(ch)
return err
}