124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
package interrupts
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import (
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"bufio"
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"fmt"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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"io"
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"os"
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"strconv"
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"strings"
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)
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type Interrupts struct{}
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type IRQ struct {
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ID string
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Type string
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Device string
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Total int64
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Cpus []int64
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}
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func NewIRQ(id string) *IRQ {
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return &IRQ{ID: id, Cpus: []int64{}}
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}
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const sampleConfig = `
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## To filter which IRQs to collect, make use of tagpass / tagdrop, i.e.
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# [inputs.interrupts.tagdrop]
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# irq = [ "NET_RX", "TASKLET" ]
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`
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func (s *Interrupts) Description() string {
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return "This plugin gathers interrupts data from /proc/interrupts and /proc/softirqs."
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}
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func (s *Interrupts) SampleConfig() string {
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return sampleConfig
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}
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func parseInterrupts(r io.Reader) ([]IRQ, error) {
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var irqs []IRQ
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var cpucount int
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scanner := bufio.NewScanner(r)
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if scanner.Scan() {
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cpus := strings.Fields(scanner.Text())
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if cpus[0] != "CPU0" {
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return nil, fmt.Errorf("Expected first line to start with CPU0, but was %s", scanner.Text())
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}
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cpucount = len(cpus)
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}
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if !strings.HasSuffix(fields[0], ":") {
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continue
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}
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irqid := strings.TrimRight(fields[0], ":")
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irq := NewIRQ(irqid)
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irqvals := fields[1:len(fields)]
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for i := 0; i < cpucount; i++ {
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if i < len(irqvals) {
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irqval, err := strconv.ParseInt(irqvals[i], 10, 64)
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if err != nil {
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return irqs, fmt.Errorf("Unable to parse %q from %q: %s", irqvals[i], scanner.Text(), err)
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}
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irq.Cpus = append(irq.Cpus, irqval)
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}
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}
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for _, irqval := range irq.Cpus {
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irq.Total += irqval
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}
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_, err := strconv.ParseInt(irqid, 10, 64)
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if err == nil && len(fields) >= cpucount+2 {
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irq.Type = fields[cpucount+1]
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irq.Device = strings.Join(fields[cpucount+2:], " ")
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} else if len(fields) > cpucount {
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irq.Type = strings.Join(fields[cpucount+1:], " ")
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}
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irqs = append(irqs, *irq)
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}
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if scanner.Err() != nil {
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return nil, fmt.Errorf("Error scanning file: %s", scanner.Err())
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}
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return irqs, nil
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}
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func gatherTagsFields(irq IRQ) (map[string]string, map[string]interface{}) {
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tags := map[string]string{"irq": irq.ID, "type": irq.Type, "device": irq.Device}
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fields := map[string]interface{}{"total": irq.Total}
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for i := 0; i < len(irq.Cpus); i++ {
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cpu := fmt.Sprintf("CPU%d", i)
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fields[cpu] = irq.Cpus[i]
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}
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return tags, fields
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}
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func (s *Interrupts) Gather(acc telegraf.Accumulator) error {
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for measurement, file := range map[string]string{"interrupts": "/proc/interrupts", "soft_interrupts": "/proc/softirqs"} {
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f, err := os.Open(file)
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if err != nil {
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acc.AddError(fmt.Errorf("Could not open file: %s", file))
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continue
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}
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defer f.Close()
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irqs, err := parseInterrupts(f)
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if err != nil {
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acc.AddError(fmt.Errorf("Parsing %s: %s", file, err))
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continue
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}
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for _, irq := range irqs {
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tags, fields := gatherTagsFields(irq)
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acc.AddFields(measurement, fields, tags)
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}
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}
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return nil
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}
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func init() {
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inputs.Add("interrupts", func() telegraf.Input {
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return &Interrupts{}
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})
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}
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