132 lines
4.0 KiB
Go
132 lines
4.0 KiB
Go
// +build !nonative
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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/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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procDiskStats = "/proc/diskstats"
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)
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type diskStat struct {
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name string
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metric prometheus.Metric
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documentation string
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}
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var (
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ignoredDevices = flag.String("diskstatsIgnoredDevices", "^(ram|loop|(h|s|xv)d[a-z])\\d+$", "Regexp of devices to ignore for diskstats.")
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// Docs from https://www.kernel.org/doc/Documentation/iostats.txt
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diskStatsMetrics = []diskStat{
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{"reads_completed", prometheus.NewCounter(), "The total number of reads completed successfully."},
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{"reads_merged", prometheus.NewCounter(), "The number of reads merged. See https://www.kernel.org/doc/Documentation/iostats.txt"},
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{"sectors_read", prometheus.NewCounter(), "The total number of sectors read successfully."},
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{"read_time_ms", prometheus.NewCounter(), "the total number of milliseconds spent by all reads."},
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{"writes_completed", prometheus.NewCounter(), "The total number of writes completed successfully."},
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{"writes_merged", prometheus.NewCounter(), "The number of writes merged. See https://www.kernel.org/doc/Documentation/iostats.txt"},
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{"sectors_written", prometheus.NewCounter(), "The total number of sectors written successfully."},
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{"write_time_ms", prometheus.NewCounter(), "This is the total number of milliseconds spent by all writes."},
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{"io_now", prometheus.NewGauge(), "The number of I/Os currently in progress."},
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{"io_time_ms", prometheus.NewCounter(), "Milliseconds spent doing I/Os."},
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{"io_time_weighted", prometheus.NewCounter(), "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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)
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type diskstatsCollector struct {
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registry prometheus.Registry
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config Config
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ignoredDevicesPattern *regexp.Regexp
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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 config struct and prometheus registry and returns a new Collector exposing
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// disk device stats.
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func NewDiskstatsCollector(config Config, registry prometheus.Registry) (Collector, error) {
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c := diskstatsCollector{
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config: config,
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registry: registry,
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ignoredDevicesPattern: regexp.MustCompile(*ignoredDevices),
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}
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for _, v := range diskStatsMetrics {
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registry.Register(
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"node_disk_"+v.name,
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v.documentation,
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prometheus.NilLabels,
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v.metric,
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)
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}
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return &c, nil
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}
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func (c *diskstatsCollector) Update() (updates int, err error) {
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diskStats, err := getDiskStats()
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if err != nil {
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return updates, 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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glog.V(1).Infof("Ignoring device: %s", dev)
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continue
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}
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for k, value := range stats {
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updates++
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return updates, fmt.Errorf("Invalid value %s in diskstats: %s", value, err)
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}
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labels := map[string]string{"device": dev}
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counter, ok := diskStatsMetrics[k].metric.(prometheus.Counter)
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if ok {
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counter.Set(labels, v)
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} else {
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var gauge = diskStatsMetrics[k].metric.(prometheus.Gauge)
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gauge.Set(labels, v)
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}
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}
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}
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return updates, 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(procDiskStats)
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if err != nil {
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return nil, err
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}
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return parseDiskStats(file)
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}
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func parseDiskStats(r io.ReadCloser) (map[string]map[int]string, error) {
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defer r.Close()
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diskStats := map[string]map[int]string{}
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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parts := strings.Fields(string(scanner.Text()))
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if len(parts) != len(diskStatsMetrics)+3 { // we strip major, minor and dev
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return nil, fmt.Errorf("Invalid line in %s: %s", procDiskStats, 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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}
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return diskStats, nil
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}
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