mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 20:36:21 +01:00
92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
// Copyright 2015 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
// +build !nofilefd
|
|
|
|
package collector
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"strconv"
|
|
|
|
"github.com/go-kit/kit/log"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
const (
|
|
fileFDStatSubsystem = "filefd"
|
|
)
|
|
|
|
type fileFDStatCollector struct {
|
|
logger log.Logger
|
|
}
|
|
|
|
func init() {
|
|
registerCollector(fileFDStatSubsystem, defaultEnabled, NewFileFDStatCollector)
|
|
}
|
|
|
|
// NewFileFDStatCollector returns a new Collector exposing file-nr stats.
|
|
func NewFileFDStatCollector(logger log.Logger) (Collector, error) {
|
|
return &fileFDStatCollector{logger}, nil
|
|
}
|
|
|
|
func (c *fileFDStatCollector) Update(ch chan<- prometheus.Metric) error {
|
|
fileFDStat, err := parseFileFDStats(procFilePath("sys/fs/file-nr"))
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get file-nr: %s", err)
|
|
}
|
|
for name, value := range fileFDStat {
|
|
v, err := strconv.ParseFloat(value, 64)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid value %s in file-nr: %s", value, err)
|
|
}
|
|
ch <- prometheus.MustNewConstMetric(
|
|
prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, fileFDStatSubsystem, name),
|
|
fmt.Sprintf("File descriptor statistics: %s.", name),
|
|
nil, nil,
|
|
),
|
|
prometheus.GaugeValue, v,
|
|
)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func parseFileFDStats(filename string) (map[string]string, error) {
|
|
file, err := os.Open(filename)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer file.Close()
|
|
|
|
content, err := ioutil.ReadAll(file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
parts := bytes.Split(bytes.TrimSpace(content), []byte("\u0009"))
|
|
if len(parts) < 3 {
|
|
return nil, fmt.Errorf("unexpected number of file stats in %q", filename)
|
|
}
|
|
|
|
var fileFDStat = map[string]string{}
|
|
// The file-nr proc is only 1 line with 3 values.
|
|
fileFDStat["allocated"] = string(parts[0])
|
|
// The second value is skipped as it will always be zero in linux 2.6.
|
|
fileFDStat["maximum"] = string(parts[2])
|
|
|
|
return fileFDStat, nil
|
|
}
|