mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-28 06:59:44 -08:00
101 lines
2.1 KiB
Go
101 lines
2.1 KiB
Go
// +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/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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procMemInfo = "/proc/meminfo"
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memInfoSubsystem = "memory"
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)
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type meminfoCollector struct {
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config Config
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metrics map[string]prometheus.Gauge
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}
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func init() {
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Factories["meminfo"] = NewMeminfoCollector
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}
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// Takes a config struct and prometheus registry and returns a new Collector exposing
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// memory stats.
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func NewMeminfoCollector(config Config) (Collector, error) {
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return &meminfoCollector{
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config: config,
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metrics: map[string]prometheus.Gauge{},
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}, 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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glog.V(1).Infof("Set node_mem: %#v", memInfo)
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for k, v := range memInfo {
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if _, ok := c.metrics[k]; !ok {
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c.metrics[k] = prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: memInfoSubsystem,
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Name: k,
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Help: k + " from /proc/meminfo.",
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})
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}
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c.metrics[k].Set(v)
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c.metrics[k].Collect(ch)
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}
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return err
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}
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func getMemInfo() (map[string]float64, error) {
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file, err := os.Open(procMemInfo)
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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 %s: %s", procMemInfo, 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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