mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-27 02:53:02 +01:00
c23b76bfbb
* Bump exporter-toolkit to the latest release. * Use new toolkit landing page function. * Update kingpin flags. Signed-off-by: Ben Kochie <superq@gmail.com>
219 lines
5.5 KiB
Go
219 lines
5.5 KiB
Go
// Copyright 2022 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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package collector
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/alecthomas/kingpin/v2"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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var (
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sysctlInclude = kingpin.Flag("collector.sysctl.include", "Select sysctl metrics to include").Strings()
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sysctlIncludeInfo = kingpin.Flag("collector.sysctl.include-info", "Select sysctl metrics to include as info metrics").Strings()
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sysctlInfoDesc = prometheus.NewDesc(prometheus.BuildFQName(namespace, "sysctl", "info"), "sysctl info", []string{"name", "value", "index"}, nil)
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)
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type sysctlCollector struct {
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fs procfs.FS
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logger log.Logger
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sysctls []*sysctl
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}
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func init() {
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registerCollector("sysctl", defaultDisabled, NewSysctlCollector)
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}
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func NewSysctlCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open sysfs: %w", err)
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}
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c := &sysctlCollector{
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logger: logger,
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fs: fs,
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sysctls: []*sysctl{},
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}
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for _, include := range *sysctlInclude {
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sysctl, err := newSysctl(include, true)
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if err != nil {
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return nil, err
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}
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c.sysctls = append(c.sysctls, sysctl)
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}
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for _, include := range *sysctlIncludeInfo {
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sysctl, err := newSysctl(include, false)
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if err != nil {
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return nil, err
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}
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c.sysctls = append(c.sysctls, sysctl)
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}
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return c, nil
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}
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func (c *sysctlCollector) Update(ch chan<- prometheus.Metric) error {
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for _, sysctl := range c.sysctls {
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metrics, err := c.newMetrics(sysctl)
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if err != nil {
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return err
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}
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for _, metric := range metrics {
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ch <- metric
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}
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}
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return nil
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}
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func (c *sysctlCollector) newMetrics(s *sysctl) ([]prometheus.Metric, error) {
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var (
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values interface{}
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length int
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err error
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)
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if s.numeric {
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values, err = c.fs.SysctlInts(s.name)
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if err != nil {
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return nil, fmt.Errorf("error obtaining sysctl info: %w", err)
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}
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length = len(values.([]int))
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} else {
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values, err = c.fs.SysctlStrings(s.name)
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if err != nil {
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return nil, fmt.Errorf("error obtaining sysctl info: %w", err)
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}
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length = len(values.([]string))
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}
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switch length {
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case 0:
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return nil, fmt.Errorf("sysctl %s has no values", s.name)
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case 1:
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if len(s.keys) > 0 {
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return nil, fmt.Errorf("sysctl %s has only one value, but expected %v", s.name, s.keys)
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}
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return []prometheus.Metric{s.newConstMetric(values)}, nil
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default:
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if len(s.keys) == 0 {
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return s.newIndexedMetrics(values), nil
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}
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if length != len(s.keys) {
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return nil, fmt.Errorf("sysctl %s has %d keys but only %d defined in f lag", s.name, length, len(s.keys))
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}
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return s.newMappedMetrics(values)
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}
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}
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type sysctl struct {
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numeric bool
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name string
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keys []string
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}
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func newSysctl(include string, numeric bool) (*sysctl, error) {
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parts := strings.SplitN(include, ":", 2)
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s := &sysctl{
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numeric: numeric,
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name: parts[0],
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}
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if len(parts) == 2 {
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s.keys = strings.Split(parts[1], ",")
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s.name = parts[0]
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}
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return s, nil
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}
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func (s *sysctl) metricName() string {
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return SanitizeMetricName(s.name)
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}
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func (s *sysctl) newConstMetric(v interface{}) prometheus.Metric {
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if s.numeric {
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return prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "sysctl", s.metricName()),
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fmt.Sprintf("sysctl %s", s.name),
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nil, nil),
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prometheus.UntypedValue,
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float64(v.([]int)[0]))
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}
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return prometheus.MustNewConstMetric(
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sysctlInfoDesc,
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prometheus.GaugeValue,
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1.0,
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s.name,
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v.([]string)[0],
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"0",
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)
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}
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func (s *sysctl) newIndexedMetrics(v interface{}) []prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "sysctl", s.metricName()),
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fmt.Sprintf("sysctl %s", s.name),
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[]string{"index"}, nil,
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)
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switch values := v.(type) {
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case []int:
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metrics := make([]prometheus.Metric, len(values))
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for i, n := range values {
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metrics[i] = prometheus.MustNewConstMetric(desc, prometheus.UntypedValue, float64(n), strconv.Itoa(i))
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}
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return metrics
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case []string:
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metrics := make([]prometheus.Metric, len(values))
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for i, str := range values {
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metrics[i] = prometheus.MustNewConstMetric(sysctlInfoDesc, prometheus.GaugeValue, 1.0, s.name, str, strconv.Itoa(i))
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}
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return metrics
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default:
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panic(fmt.Sprintf("unexpected type %T", values))
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}
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}
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func (s *sysctl) newMappedMetrics(v interface{}) ([]prometheus.Metric, error) {
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switch values := v.(type) {
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case []int:
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metrics := make([]prometheus.Metric, len(values))
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for i, n := range values {
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key := s.keys[i]
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "sysctl", s.metricName()+"_"+key),
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fmt.Sprintf("sysctl %s, field %d", s.name, i),
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nil,
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nil,
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)
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metrics[i] = prometheus.MustNewConstMetric(desc, prometheus.UntypedValue, float64(n))
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}
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return metrics, nil
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case []string:
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return nil, fmt.Errorf("mapped sysctl string values not supported")
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default:
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return nil, fmt.Errorf("unexpected type %T", values)
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}
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}
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