mirror of
https://github.com/prometheus/node_exporter.git
synced 2025-03-05 21:00:12 -08:00
112 lines
3 KiB
Go
112 lines
3 KiB
Go
|
// Copyright 2023 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.
|
||
|
|
|
||
|
|
//go:build linux && !nokey_users
|
||
|
|
// +build linux,!nokey_users
|
||
|
|
|
||
|
|
package collector
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"os"
|
||
|
|
"regexp"
|
||
|
|
"strconv"
|
||
|
|
|
||
|
|
"github.com/go-kit/log"
|
||
|
|
"github.com/go-kit/log/level"
|
||
|
|
"github.com/prometheus/client_golang/prometheus"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
keyUsersSubsystem = "keys"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
// See https://man7.org/linux/man-pages/man7/keyrings.7.html
|
||
|
|
keyUsersLineRegex = regexp.MustCompile(`^\s*(?P<uid>\d+):\s+(?P<usage>\d+)\s+(?P<nkeys>\d+)/(?P<nikeys>\d+)\s+(?P<qnkeys>\d+)/(?P<maxkeys>\d+)\s+(?P<qnbytes>\d+)/(?P<maxbytes>\d+)$`)
|
||
|
|
)
|
||
|
|
|
||
|
|
type keyUsersCollector struct {
|
||
|
|
logger log.Logger
|
||
|
|
}
|
||
|
|
|
||
|
|
type keyUsersEntry struct {
|
||
|
|
uid int64
|
||
|
|
name string
|
||
|
|
}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
registerCollector("key_users", defaultDisabled, NewKeyUsersCollector)
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewKeyUsersCollector(logger log.Logger) (Collector, error) {
|
||
|
|
return &keyUsersCollector{logger}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *keyUsersCollector) Update(ch chan<- prometheus.Metric) error {
|
||
|
|
keyUsers, err := c.getKeyUsers()
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("couldn't get key-users: %w", err)
|
||
|
|
}
|
||
|
|
level.Debug(c.logger).Log("msg", "Set node_keys", "keyUsers", keyUsers)
|
||
|
|
for k, v := range keyUsers {
|
||
|
|
ch <- prometheus.MustNewConstMetric(
|
||
|
|
prometheus.NewDesc(
|
||
|
|
prometheus.BuildFQName(namespace, keyUsersSubsystem, k.name),
|
||
|
|
fmt.Sprintf("Key utilization field %s.", k.name),
|
||
|
|
[]string{"uid"}, nil,
|
||
|
|
),
|
||
|
|
prometheus.GaugeValue, v, strconv.FormatInt(int64(k.uid), 10),
|
||
|
|
)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *keyUsersCollector) getKeyUsers() (map[keyUsersEntry]float64, error) {
|
||
|
|
file, err := os.Open(procFilePath("key-users"))
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
defer file.Close()
|
||
|
|
|
||
|
|
return parseKeyUsers(file)
|
||
|
|
}
|
||
|
|
|
||
|
|
func parseKeyUsers(r io.Reader) (map[keyUsersEntry]float64, error) {
|
||
|
|
var scanner = bufio.NewScanner(r)
|
||
|
|
var keyUsersInfo = map[keyUsersEntry]float64{}
|
||
|
|
|
||
|
|
for scanner.Scan() {
|
||
|
|
line := scanner.Text()
|
||
|
|
match := keyUsersLineRegex.FindStringSubmatch(line)
|
||
|
|
names := keyUsersLineRegex.SubexpNames()
|
||
|
|
if len(match) != len(names) {
|
||
|
|
return nil, fmt.Errorf("invalid line in key-users: %s", line)
|
||
|
|
}
|
||
|
|
uid, err := strconv.ParseInt(match[1], 10, 32)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("invalid UID in key-users: %s", match[0])
|
||
|
|
}
|
||
|
|
for i := 2; i < len(names); i++ {
|
||
|
|
v, err := strconv.ParseInt(match[i], 10, 64)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("invalid metric '%s' in key-users: %s", names[i], match[i])
|
||
|
|
}
|
||
|
|
keyUsersInfo[keyUsersEntry{uid, names[i]}] = float64(v)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return keyUsersInfo, scanner.Err()
|
||
|
|
}
|