128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
// +build linux
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package kernel
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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// /proc/stat file line prefixes to gather stats on:
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var (
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interrupts = []byte("intr")
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context_switches = []byte("ctxt")
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processes_forked = []byte("processes")
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disk_pages = []byte("page")
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boot_time = []byte("btime")
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)
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type Kernel struct {
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statFile string
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entropyStatFile string
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}
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func (k *Kernel) Description() string {
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return "Get kernel statistics from /proc/stat"
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}
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func (k *Kernel) SampleConfig() string { return "" }
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func (k *Kernel) Gather(acc telegraf.Accumulator) error {
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data, err := k.getProcStat()
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if err != nil {
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return err
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}
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entropyData, err := ioutil.ReadFile(k.entropyStatFile)
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if err != nil {
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return err
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}
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entropyString := string(entropyData)
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entropyValue, err := strconv.ParseInt(strings.TrimSpace(entropyString), 10, 64)
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if err != nil {
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return err
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}
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fields := make(map[string]interface{})
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fields["entropy_avail"] = int64(entropyValue)
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dataFields := bytes.Fields(data)
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for i, field := range dataFields {
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switch {
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case bytes.Equal(field, interrupts):
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m, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
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if err != nil {
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return err
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}
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fields["interrupts"] = int64(m)
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case bytes.Equal(field, context_switches):
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m, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
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if err != nil {
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return err
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}
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fields["context_switches"] = int64(m)
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case bytes.Equal(field, processes_forked):
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m, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
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if err != nil {
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return err
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}
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fields["processes_forked"] = int64(m)
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case bytes.Equal(field, boot_time):
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m, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
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if err != nil {
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return err
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}
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fields["boot_time"] = int64(m)
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case bytes.Equal(field, disk_pages):
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in, err := strconv.ParseInt(string(dataFields[i+1]), 10, 64)
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if err != nil {
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return err
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}
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out, err := strconv.ParseInt(string(dataFields[i+2]), 10, 64)
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if err != nil {
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return err
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}
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fields["disk_pages_in"] = int64(in)
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fields["disk_pages_out"] = int64(out)
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}
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}
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acc.AddCounter("kernel", fields, map[string]string{})
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return nil
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}
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func (k *Kernel) getProcStat() ([]byte, error) {
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if _, err := os.Stat(k.statFile); os.IsNotExist(err) {
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return nil, fmt.Errorf("kernel: %s does not exist!", k.statFile)
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} else if err != nil {
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return nil, err
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}
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data, err := ioutil.ReadFile(k.statFile)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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func init() {
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inputs.Add("kernel", func() telegraf.Input {
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return &Kernel{
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statFile: "/proc/stat",
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entropyStatFile: "/proc/sys/kernel/random/entropy_avail",
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}
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})
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}
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