85 lines
2.0 KiB
Go
85 lines
2.0 KiB
Go
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// +build !nofilefd
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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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"github.com/prometheus/client_golang/prometheus"
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"io"
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"os"
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"strconv"
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"strings"
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)
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const (
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procFileFDStat = "/proc/sys/fs/file-nr"
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fileFDStatSubsystem = "filefd"
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)
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type fileFDStatCollector struct {
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metrics map[string]prometheus.Gauge
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}
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func init() {
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Factories[fileFDStatSubsystem] = NewFileFDStatCollector
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}
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// NewFileFDStatCollector returns a new Collector exposing file-nr stats.
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func NewFileFDStatCollector() (Collector, error) {
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return &fileFDStatCollector{
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metrics: map[string]prometheus.Gauge{},
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}, nil
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}
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func (c *fileFDStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
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fileFDStat, err := getFileFDStats(procFileFDStat)
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if err != nil {
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return fmt.Errorf("couldn't get file-nr: %s", err)
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}
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for name, value := range fileFDStat {
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if _, ok := c.metrics[name]; !ok {
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c.metrics[name] = prometheus.NewGauge(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: fileFDStatSubsystem,
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Name: name,
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Help: fmt.Sprintf("filefd %s from %s.", name, procFileFDStat),
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},
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)
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("invalid value %s in file-nr: %s", value, err)
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}
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c.metrics[name].Set(v)
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}
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}
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for _, m := range c.metrics {
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m.Collect(ch)
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}
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return err
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}
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func getFileFDStats(fileName string) (map[string]string, error) {
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file, err := os.Open(fileName)
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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 parseFileFDStats(file, fileName)
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}
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func parseFileFDStats(r io.Reader, fileName string) (map[string]string, error) {
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var scanner = bufio.NewScanner(r)
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scanner.Scan()
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// The file-nr proc file is separated by tabs, not spaces.
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line := strings.Split(string(scanner.Text()), "\u0009")
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var fileFDStat = map[string]string{}
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// The file-nr proc is only 1 line with 3 values.
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fileFDStat["allocated"] = line[0]
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// The second value is skipped as it will alwasy be zero in linux 2.6.
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fileFDStat["maximum"] = line[2]
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return fileFDStat, nil
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}
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