mirror of
https://github.com/prometheus/node_exporter.git
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922e74d58f
Named return variables should only be used to describe the returned type further, e.g. `err error` doesn't add any new information and is just stutter.
79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
// 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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"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, stratum typedDesc
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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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// NewNtpCollector returns a new Collector exposing the offset between ntp and
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// the current system time.
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func NewNtpCollector() (Collector, error) {
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warnDeprecated("ntp")
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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: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "ntp", "drift_seconds"),
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"Time between system time and ntp time.",
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nil, nil,
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), prometheus.GaugeValue},
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stratum: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "ntp", "stratum"),
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"NTP server stratum.",
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nil, nil,
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), prometheus.GaugeValue},
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}, nil
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}
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func (c *ntpCollector) Update(ch chan<- prometheus.Metric) error {
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resp, err := ntp.Query(*ntpServer, *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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driftSeconds := resp.ClockOffset.Seconds()
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log.Debugf("Set ntp_drift_seconds: %f", driftSeconds)
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ch <- c.drift.mustNewConstMetric(driftSeconds)
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stratum := float64(resp.Stratum)
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log.Debugf("Set ntp_stratum: %f", stratum)
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ch <- c.stratum.mustNewConstMetric(stratum)
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return nil
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}
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