telegraf/plugins/inputs/system/kernel_vmstat.go

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// +build linux
package system
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"strconv"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
type KernelVmstat struct {
statFile string
}
func (k *KernelVmstat) Description() string {
return "Get kernel statistics from /proc/vmstat"
}
func (k *KernelVmstat) SampleConfig() string {
return ""
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}
func (k *KernelVmstat) Gather(acc telegraf.Accumulator) error {
data, err := k.getProcVmstat()
if err != nil {
return err
}
fields := make(map[string]interface{})
dataFields := bytes.Fields(data)
for i, field := range dataFields {
// dataFields is an array of {"stat1_name", "stat1_value", "stat2_name",
// "stat2_value", ...}
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// We only want the even number index as that contain the stat name.
if i%2 == 0 {
// Convert the stat value into an integer.
m, err := strconv.Atoi(string(dataFields[i+1]))
if err != nil {
return err
}
fields[string(field)] = int64(m)
}
}
acc.AddFields("kernel_vmstat", fields, map[string]string{})
return nil
}
func (k *KernelVmstat) getProcVmstat() ([]byte, error) {
if _, err := os.Stat(k.statFile); os.IsNotExist(err) {
return nil, fmt.Errorf("kernel_vmstat: %s does not exist!", k.statFile)
} else if err != nil {
return nil, err
}
data, err := ioutil.ReadFile(k.statFile)
if err != nil {
return nil, err
}
return data, nil
}
func init() {
inputs.Add("kernel_vmstat", func() telegraf.Input {
return &KernelVmstat{
statFile: "/proc/vmstat",
}
})
}