telegraf/plugins/inputs/interrupts/interrupts.go

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