mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 20:36:21 +01:00
101 lines
2.5 KiB
Go
101 lines
2.5 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 !noloadavg
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package collector
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import (
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
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)
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type loadavgCollector struct {
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metric []prometheus.Gauge
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}
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func init() {
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Factories["loadavg"] = NewLoadavgCollector
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}
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// Take a prometheus registry and return a new Collector exposing load average.
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func NewLoadavgCollector() (Collector, error) {
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return &loadavgCollector{
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metric: []prometheus.Gauge{
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prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "load1",
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Help: "1m load average.",
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}),
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prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "load5",
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Help: "5m load average.",
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}),
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prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "load15",
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Help: "15m load average.",
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}),
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},
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}, nil
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}
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func (c *loadavgCollector) Update(ch chan<- prometheus.Metric) (err error) {
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loads, err := getLoad()
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if err != nil {
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return fmt.Errorf("couldn't get load: %s", err)
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}
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for i, load := range loads {
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log.Debugf("Set load %d: %f", i, load)
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c.metric[i].Set(load)
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c.metric[i].Collect(ch)
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}
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return err
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}
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// Read loadavg from /proc.
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func getLoad() (loads []float64, err error) {
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data, err := ioutil.ReadFile(procFilePath("loadavg"))
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if err != nil {
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return nil, err
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}
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loads, err = parseLoad(string(data))
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if err != nil {
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return nil, err
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}
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return loads, nil
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}
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// Parse /proc loadavg and return 1m, 5m and 15m.
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func parseLoad(data string) (loads []float64, err error) {
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loads = make([]float64, 3)
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parts := strings.Fields(data)
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if len(parts) >= 3 {
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for i, load := range parts[0:3] {
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loads[i], err = strconv.ParseFloat(load, 64)
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if err != nil {
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return nil, fmt.Errorf("could not parse load '%s': %s", load, err)
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}
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}
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} else {
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return nil, fmt.Errorf("unexpected content in %s", procFilePath("loadavg"))
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}
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return loads, nil
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}
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