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71 lines
2.0 KiB
71 lines
2.0 KiB
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +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/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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var (
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ntpServer = flag.String("collector.ntp.server", "", "NTP server to use for ntp collector.")
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ntpProtocolVersion = flag.Int("collector.ntp.protocol-version", 4, "NTP protocol version")
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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 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() (Collector, error) {
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if *ntpServer == "" {
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return nil, fmt.Errorf("no NTP server specified, see -collector.ntp.server")
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}
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if *ntpProtocolVersion < 2 || *ntpProtocolVersion > 4 {
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return nil, fmt.Errorf("invalid NTP protocol version %d; must be 2, 3, or 4", *ntpProtocolVersion)
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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.TimeV(*ntpServer, byte(*ntpProtocolVersion))
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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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log.Debugf("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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