You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.0 KiB
84 lines
2.0 KiB
// +build !nofilefd
|
|
|
|
package collector
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
fileFDStatSubsystem = "filefd"
|
|
)
|
|
|
|
type fileFDStatCollector struct {
|
|
metrics map[string]prometheus.Gauge
|
|
}
|
|
|
|
func init() {
|
|
Factories[fileFDStatSubsystem] = NewFileFDStatCollector
|
|
}
|
|
|
|
// NewFileFDStatCollector returns a new Collector exposing file-nr stats.
|
|
func NewFileFDStatCollector() (Collector, error) {
|
|
return &fileFDStatCollector{
|
|
metrics: map[string]prometheus.Gauge{},
|
|
}, nil
|
|
}
|
|
|
|
func (c *fileFDStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
|
|
fileFDStat, err := getFileFDStats(procFilePath("sys/fs/file-nr"))
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get file-nr: %s", err)
|
|
}
|
|
for name, value := range fileFDStat {
|
|
if _, ok := c.metrics[name]; !ok {
|
|
c.metrics[name] = prometheus.NewGauge(
|
|
prometheus.GaugeOpts{
|
|
Namespace: Namespace,
|
|
Subsystem: fileFDStatSubsystem,
|
|
Name: name,
|
|
Help: fmt.Sprintf("File descriptor statistics: %s.", name),
|
|
},
|
|
)
|
|
v, err := strconv.ParseFloat(value, 64)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid value %s in file-nr: %s", value, err)
|
|
}
|
|
c.metrics[name].Set(v)
|
|
}
|
|
}
|
|
for _, m := range c.metrics {
|
|
m.Collect(ch)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func getFileFDStats(fileName string) (map[string]string, error) {
|
|
file, err := os.Open(fileName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer file.Close()
|
|
return parseFileFDStats(file, fileName)
|
|
}
|
|
|
|
func parseFileFDStats(r io.Reader, fileName string) (map[string]string, error) {
|
|
var scanner = bufio.NewScanner(r)
|
|
scanner.Scan()
|
|
// The file-nr proc file is separated by tabs, not spaces.
|
|
line := strings.Split(string(scanner.Text()), "\u0009")
|
|
var fileFDStat = map[string]string{}
|
|
// The file-nr proc is only 1 line with 3 values.
|
|
fileFDStat["allocated"] = line[0]
|
|
// The second value is skipped as it will alwasy be zero in linux 2.6.
|
|
fileFDStat["maximum"] = line[2]
|
|
|
|
return fileFDStat, nil
|
|
}
|