mirror of
https://github.com/prometheus/node_exporter.git
synced 2025-08-20 18:33:52 -07:00
eac396c637
This suffers from the same concurrency bug as the netstat one: https://github.com/prometheus/node_exporter/issues/280
105 lines
2.5 KiB
Go
105 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 !nomeminfo
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"regexp"
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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/common/log"
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)
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const (
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memInfoSubsystem = "memory"
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)
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type meminfoCollector struct{}
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func init() {
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Factories["meminfo"] = NewMeminfoCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// memory stats.
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func NewMeminfoCollector() (Collector, error) {
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return &meminfoCollector{}, nil
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}
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func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
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memInfo, err := getMemInfo()
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if err != nil {
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return fmt.Errorf("couldn't get meminfo: %s", err)
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}
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log.Debugf("Set node_mem: %#v", memInfo)
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for k, v := range memInfo {
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, memInfoSubsystem, k),
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fmt.Sprintf("Memory information field %s.", k),
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nil, nil,
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),
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prometheus.GaugeValue, v,
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)
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}
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return nil
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}
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func getMemInfo() (map[string]float64, error) {
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file, err := os.Open(procFilePath("meminfo"))
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return parseMemInfo(file)
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}
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func parseMemInfo(r io.Reader) (map[string]float64, error) {
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var (
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memInfo = map[string]float64{}
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scanner = bufio.NewScanner(r)
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re = regexp.MustCompile("\\((.*)\\)")
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)
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for scanner.Scan() {
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line := scanner.Text()
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parts := strings.Fields(string(line))
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fv, err := strconv.ParseFloat(parts[1], 64)
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if err != nil {
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return nil, fmt.Errorf("invalid value in meminfo: %s", err)
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}
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switch len(parts) {
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case 2: // no unit
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case 3: // has unit, we presume kB
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fv *= 1024
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default:
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return nil, fmt.Errorf("invalid line in meminfo: %s", line)
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}
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key := parts[0][:len(parts[0])-1] // remove trailing : from key
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// Active(anon) -> Active_anon
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key = re.ReplaceAllString(key, "_${1}")
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memInfo[key] = fv
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}
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return memInfo, nil
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}
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