telegraf/plugins/inputs/wireless/wireless_linux.go

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2018-10-29 22:57:39 +00:00
// +build linux
package wireless
import (
"bytes"
"io/ioutil"
"log"
"os"
"path"
"strconv"
"strings"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
// default host proc path
const defaultHostProc = "/proc"
// env host proc variable name
const envProc = "HOST_PROC"
// length of wireless interface fields
const interfaceFieldLength = 10
var newLineByte = []byte("\n")
type wirelessInterface struct {
Interface string
Status int64
Link int64
Level int64
Noise int64
Nwid int64
Crypt int64
Frag int64
Retry int64
Misc int64
Beacon int64
}
// Gather collects the wireless information.
func (w *Wireless) Gather(acc telegraf.Accumulator) error {
// load proc path, get default value if config value and env variable are empty
w.loadPath()
wirelessPath := path.Join(w.HostProc, "net", "wireless")
table, err := ioutil.ReadFile(wirelessPath)
if err != nil {
return err
}
interfaces, err := loadWirelessTable(table)
if err != nil {
return err
}
for _, w := range interfaces {
tags := map[string]string{
"interface": w.Interface,
}
fieldsG := map[string]interface{}{
"status": w.Status,
"link": w.Link,
"level": w.Level,
"noise": w.Noise,
}
fieldsC := map[string]interface{}{
"nwid": w.Nwid,
"crypt": w.Crypt,
"frag": w.Frag,
"retry": w.Retry,
"misc": w.Misc,
"beacon": w.Beacon,
}
acc.AddGauge("wireless", fieldsG, tags)
acc.AddCounter("wireless", fieldsC, tags)
}
return nil
}
func loadWirelessTable(table []byte) ([]*wirelessInterface, error) {
var w []*wirelessInterface
lines := bytes.Split(table, newLineByte)
// iterate over interfaces
for i := 2; i < len(lines); i = i + 1 {
if len(lines[i]) == 0 {
continue
}
values := make([]int64, 0, interfaceFieldLength)
fields := strings.Fields(string(lines[i]))
for j := 1; j < len(fields); j = j + 1 {
v, err := strconv.ParseInt(strings.Trim(fields[j], "."), 10, 64)
if err != nil {
return nil, err
}
values = append(values, v)
}
if len(values) != interfaceFieldLength {
log.Printf("E! [input.wireless] invalid length of interface values")
continue
}
w = append(w, &wirelessInterface{
Interface: strings.Trim(fields[0], ":"),
Status: values[0],
Link: values[1],
Level: values[2],
Noise: values[3],
Nwid: values[4],
Crypt: values[5],
Frag: values[6],
Retry: values[7],
Misc: values[8],
Beacon: values[9],
})
}
return w, nil
}
// loadPath can be used to read path firstly from config
// if it is empty then try read from env variable
func (w *Wireless) loadPath() {
if w.HostProc == "" {
w.HostProc = proc(envProc, defaultHostProc)
}
}
// proc can be used to read file paths from env
func proc(env, path string) string {
// try to read full file path
if p := os.Getenv(env); p != "" {
return p
}
// return default path
return path
}
func init() {
inputs.Add("wireless", func() telegraf.Input {
return &Wireless{}
})
}