mirror of
https://github.com/prometheus/node_exporter.git
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4b0986fcee
This collects usage information (per-user) on the Linux kernel keyring See: https://man7.org/linux/man-pages/man7/keyrings.7.html It is disabled by default because cardinality is one-per user. Signed-off-by: Robert Zimmerman <rzimmerman@cloudflare.com>
112 lines
3 KiB
Go
112 lines
3 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build linux && !nokey_users
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// +build linux,!nokey_users
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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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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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keyUsersSubsystem = "keys"
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)
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var (
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// See https://man7.org/linux/man-pages/man7/keyrings.7.html
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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+)$`)
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)
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type keyUsersCollector struct {
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logger log.Logger
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}
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type keyUsersEntry struct {
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uid int64
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name string
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}
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func init() {
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registerCollector("key_users", defaultDisabled, NewKeyUsersCollector)
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}
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func NewKeyUsersCollector(logger log.Logger) (Collector, error) {
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return &keyUsersCollector{logger}, nil
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}
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func (c *keyUsersCollector) Update(ch chan<- prometheus.Metric) error {
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keyUsers, err := c.getKeyUsers()
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if err != nil {
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return fmt.Errorf("couldn't get key-users: %w", err)
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}
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level.Debug(c.logger).Log("msg", "Set node_keys", "keyUsers", keyUsers)
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for k, v := range keyUsers {
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(namespace, keyUsersSubsystem, k.name),
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fmt.Sprintf("Key utilization field %s.", k.name),
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[]string{"uid"}, nil,
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),
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prometheus.GaugeValue, v, strconv.FormatInt(int64(k.uid), 10),
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)
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}
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return nil
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}
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func (c *keyUsersCollector) getKeyUsers() (map[keyUsersEntry]float64, error) {
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file, err := os.Open(procFilePath("key-users"))
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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 parseKeyUsers(file)
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}
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func parseKeyUsers(r io.Reader) (map[keyUsersEntry]float64, error) {
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var scanner = bufio.NewScanner(r)
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var keyUsersInfo = map[keyUsersEntry]float64{}
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for scanner.Scan() {
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line := scanner.Text()
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match := keyUsersLineRegex.FindStringSubmatch(line)
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names := keyUsersLineRegex.SubexpNames()
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if len(match) != len(names) {
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return nil, fmt.Errorf("invalid line in key-users: %s", line)
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}
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uid, err := strconv.ParseInt(match[1], 10, 32)
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if err != nil {
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return nil, fmt.Errorf("invalid UID in key-users: %s", match[0])
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}
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for i := 2; i < len(names); i++ {
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v, err := strconv.ParseInt(match[i], 10, 64)
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if err != nil {
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return nil, fmt.Errorf("invalid metric '%s' in key-users: %s", names[i], match[i])
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}
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keyUsersInfo[keyUsersEntry{uid, names[i]}] = float64(v)
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}
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}
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return keyUsersInfo, scanner.Err()
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}
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