mirror of
https://github.com/prometheus/node_exporter.git
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118 lines
2.5 KiB
Go
118 lines
2.5 KiB
Go
// +build !nointerrupts
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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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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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procInterrupts = "/proc/interrupts"
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)
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type interruptsCollector struct {
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metric *prometheus.CounterVec
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}
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func init() {
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Factories["interrupts"] = NewInterruptsCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// interrupts stats
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func NewInterruptsCollector() (Collector, error) {
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return &interruptsCollector{
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metric: prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Name: "interrupts",
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Help: "Interrupt details from /proc/interrupts.",
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},
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[]string{"CPU", "type", "info", "devices"},
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),
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}, nil
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}
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func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) (err error) {
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interrupts, err := getInterrupts()
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if err != nil {
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return fmt.Errorf("Couldn't get interrupts: %s", err)
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}
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for name, interrupt := range interrupts {
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for cpuNo, value := range interrupt.values {
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fv, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("Invalid value %s in interrupts: %s", value, err)
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}
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labels := prometheus.Labels{
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"CPU": strconv.Itoa(cpuNo),
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"type": name,
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"info": interrupt.info,
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"devices": interrupt.devices,
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}
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c.metric.With(labels).Set(fv)
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}
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}
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c.metric.Collect(ch)
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return err
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}
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type interrupt struct {
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info string
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devices string
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values []string
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}
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func getInterrupts() (map[string]interrupt, error) {
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file, err := os.Open(procInterrupts)
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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 parseInterrupts(file)
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}
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func parseInterrupts(r io.Reader) (map[string]interrupt, error) {
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var (
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interrupts = map[string]interrupt{}
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scanner = bufio.NewScanner(r)
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)
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if !scanner.Scan() {
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return nil, fmt.Errorf("%s empty", procInterrupts)
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}
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cpuNum := len(strings.Fields(string(scanner.Text()))) // one header per cpu
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for scanner.Scan() {
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line := scanner.Text()
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parts := strings.Fields(string(line))
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if len(parts) < cpuNum+2 { // irq + one column per cpu + details,
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continue // we ignore ERR and MIS for now
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}
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intName := parts[0][:len(parts[0])-1] // remove trailing :
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intr := interrupt{
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values: parts[1:cpuNum],
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}
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if _, err := strconv.Atoi(intName); err == nil { // numeral interrupt
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intr.info = parts[cpuNum+1]
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intr.devices = strings.Join(parts[cpuNum+2:], " ")
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} else {
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intr.info = strings.Join(parts[cpuNum+1:], " ")
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}
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interrupts[intName] = intr
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}
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return interrupts, nil
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}
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