mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-20 07:26:08 +01:00
268 lines
7.2 KiB
Go
268 lines
7.2 KiB
Go
// Copyright 2015 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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// +build !nodiskstats
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package collector
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import (
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"bufio"
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"flag"
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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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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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const (
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diskSubsystem = "disk"
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diskSectorSize uint64 = 512
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)
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var (
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ignoredDevices = flag.String("collector.diskstats.ignored-devices", "^(ram|loop|fd|(h|s|v|xv)d[a-z])\\d+$", "Regexp of devices to ignore for diskstats.")
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)
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type diskstatsCollector struct {
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ignoredDevicesPattern *regexp.Regexp
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metrics []prometheus.Collector
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}
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func init() {
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Factories["diskstats"] = NewDiskstatsCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// disk device stats.
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func NewDiskstatsCollector() (Collector, error) {
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var diskLabelNames = []string{"device"}
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return &diskstatsCollector{
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ignoredDevicesPattern: regexp.MustCompile(*ignoredDevices),
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// Docs from https://www.kernel.org/doc/Documentation/iostats.txt
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metrics: []prometheus.Collector{
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "reads_completed",
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Help: "The total number of reads completed successfully.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "reads_merged",
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Help: "The number of reads merged. See https://www.kernel.org/doc/Documentation/iostats.txt.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "sectors_read",
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Help: "The total number of sectors read successfully.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "read_time_ms",
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Help: "The total number of milliseconds spent by all reads.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "writes_completed",
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Help: "The total number of writes completed successfully.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "writes_merged",
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Help: "The number of writes merged. See https://www.kernel.org/doc/Documentation/iostats.txt.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "sectors_written",
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Help: "The total number of sectors written successfully.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "write_time_ms",
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Help: "This is the total number of milliseconds spent by all writes.",
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},
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diskLabelNames,
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),
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prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "io_now",
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Help: "The number of I/Os currently in progress.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "io_time_ms",
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Help: "Milliseconds spent doing I/Os.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "io_time_weighted",
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Help: "The weighted # of milliseconds spent doing I/Os. See https://www.kernel.org/doc/Documentation/iostats.txt.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "bytes_read",
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Help: "The total number of bytes read successfully.",
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},
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diskLabelNames,
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),
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prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Subsystem: diskSubsystem,
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Name: "bytes_written",
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Help: "The total number of bytes written successfully.",
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},
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diskLabelNames,
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),
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},
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}, nil
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}
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func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) (err error) {
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procDiskStats := procFilePath("diskstats")
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diskStats, err := getDiskStats()
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if err != nil {
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return fmt.Errorf("couldn't get diskstats: %s", err)
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}
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for dev, stats := range diskStats {
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if c.ignoredDevicesPattern.MatchString(dev) {
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log.Debugf("Ignoring device: %s", dev)
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continue
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}
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if len(stats) != len(c.metrics) {
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return fmt.Errorf("invalid line for %s for %s", procDiskStats, dev)
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}
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for k, value := range stats {
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("invalid value %s in diskstats: %s", value, err)
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}
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if counter, ok := c.metrics[k].(*prometheus.CounterVec); ok {
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counter.WithLabelValues(dev).Set(v)
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} else if gauge, ok := c.metrics[k].(*prometheus.GaugeVec); ok {
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gauge.WithLabelValues(dev).Set(v)
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} else {
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return fmt.Errorf("unexpected collector %d", k)
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}
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}
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}
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for _, c := range c.metrics {
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c.Collect(ch)
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}
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return err
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}
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func getDiskStats() (map[string]map[int]string, error) {
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file, err := os.Open(procFilePath("diskstats"))
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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 parseDiskStats(file)
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}
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func convertDiskSectorsToBytes(sectorCount string) (string, error) {
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sectors, err := strconv.ParseUint(sectorCount, 10, 64)
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if err != nil {
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return "", err
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}
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return strconv.FormatUint(sectors*diskSectorSize, 10), nil
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}
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func parseDiskStats(r io.Reader) (map[string]map[int]string, error) {
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var (
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diskStats = map[string]map[int]string{}
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scanner = bufio.NewScanner(r)
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)
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for scanner.Scan() {
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parts := strings.Fields(string(scanner.Text()))
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if len(parts) < 4 { // we strip major, minor and dev
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return nil, fmt.Errorf("invalid line in %s: %s", procFilePath("diskstats"), scanner.Text())
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}
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dev := parts[2]
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diskStats[dev] = map[int]string{}
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for i, v := range parts[3:] {
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diskStats[dev][i] = v
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}
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bytesRead, err := convertDiskSectorsToBytes(diskStats[dev][2])
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if err != nil {
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return nil, fmt.Errorf("invalid value for sectors read in %s: %s", procFilePath("diskstats"), scanner.Text())
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}
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diskStats[dev][11] = bytesRead
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bytesWritten, err := convertDiskSectorsToBytes(diskStats[dev][6])
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if err != nil {
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return nil, fmt.Errorf("invalid value for sectors written in %s: %s", procFilePath("diskstats"), scanner.Text())
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}
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diskStats[dev][12] = bytesWritten
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}
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return diskStats, nil
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}
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