telegraf/plugins/inputs/ping/ping_windows.go

211 lines
5.3 KiB
Go
Raw Normal View History

// +build windows
package ping
import (
"errors"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
"os/exec"
"regexp"
"strconv"
"strings"
"sync"
"time"
)
// HostPinger is a function that runs the "ping" function using a list of
// passed arguments. This can be easily switched with a mocked ping function
// for unit test purposes (see ping_test.go)
type HostPinger func(timeout float64, args ...string) (string, error)
type Ping struct {
// Number of pings to send (ping -c <COUNT>)
Count int
// Ping timeout, in seconds. 0 means no timeout (ping -W <TIMEOUT>)
Timeout float64
// URLs to ping
Urls []string
// host ping function
pingHost HostPinger
}
func (s *Ping) Description() string {
return "Ping given url(s) and return statistics"
}
const sampleConfig = `
## urls to ping
urls = ["www.google.com"] # required
## number of pings to send per collection (ping -n <COUNT>)
count = 4 # required
## Ping timeout, in seconds. 0 means default timeout (ping -w <TIMEOUT>)
Timeout = 0
`
func (s *Ping) SampleConfig() string {
return sampleConfig
}
func hostPinger(timeout float64, args ...string) (string, error) {
bin, err := exec.LookPath("ping")
if err != nil {
return "", err
}
c := exec.Command(bin, args...)
out, err := internal.CombinedOutputTimeout(c,
time.Second*time.Duration(timeout+1))
return string(out), err
}
// processPingOutput takes in a string output from the ping command
// based on linux implementation but using regex ( multilanguage support ) ( shouldn't affect the performance of the program )
// It returns (<transmitted packets>, <received packets>, <average response>, <min response>, <max response>)
func processPingOutput(out string) (int, int, int, int, int, error) {
// So find a line contain 3 numbers except reply lines
var stats, aproxs []string = nil, nil
err := errors.New("Fatal error processing ping output")
stat := regexp.MustCompile(`=\W*(\d+)\D*=\W*(\d+)\D*=\W*(\d+)`)
aprox := regexp.MustCompile(`=\W*(\d+)\D*ms\D*=\W*(\d+)\D*ms\D*=\W*(\d+)\D*ms`)
lines := strings.Split(out, "\n")
for _, line := range lines {
if !strings.Contains(line, "TTL") {
if stats == nil {
stats = stat.FindStringSubmatch(line)
}
if stats != nil && aproxs == nil {
aproxs = aprox.FindStringSubmatch(line)
}
}
}
// stats data should contain 4 members: entireExpression + ( Send, Receive, Lost )
if len(stats) != 4 {
return 0, 0, 0, 0, 0, err
}
trans, err := strconv.Atoi(stats[1])
if err != nil {
return 0, 0, 0, 0, 0, err
}
rec, err := strconv.Atoi(stats[2])
if err != nil {
return 0, 0, 0, 0, 0, err
}
// aproxs data should contain 4 members: entireExpression + ( min, max, avg )
if len(aproxs) != 4 {
return trans, rec, 0, 0, 0, err
}
min, err := strconv.Atoi(aproxs[1])
if err != nil {
return trans, rec, 0, 0, 0, err
}
max, err := strconv.Atoi(aproxs[2])
if err != nil {
return trans, rec, 0, 0, 0, err
}
avg, err := strconv.Atoi(aproxs[3])
if err != nil {
return 0, 0, 0, 0, 0, err
}
return trans, rec, avg, min, max, err
}
func (p *Ping) timeout() float64 {
// According to MSDN, default ping timeout for windows is 4 second
// Add also one second interval
if p.Timeout > 0 {
return p.Timeout + 1
}
return 4 + 1
}
// args returns the arguments for the 'ping' executable
func (p *Ping) args(url string) []string {
args := []string{"-n", strconv.Itoa(p.Count)}
if p.Timeout > 0 {
args = append(args, "-w", strconv.FormatFloat(p.Timeout*1000, 'f', 0, 64))
}
args = append(args, url)
return args
}
func (p *Ping) Gather(acc telegraf.Accumulator) error {
var wg sync.WaitGroup
errorChannel := make(chan error, len(p.Urls)*2)
var pendingError error = nil
// Spin off a go routine for each url to ping
for _, url := range p.Urls {
wg.Add(1)
go func(u string) {
defer wg.Done()
args := p.args(u)
totalTimeout := p.timeout() * float64(p.Count)
out, err := p.pingHost(totalTimeout, args...)
// ping host return exitcode != 0 also when there was no response from host
// but command was execute succesfully
if err != nil {
// Combine go err + stderr output
pendingError = errors.New(strings.TrimSpace(out) + ", " + err.Error())
}
tags := map[string]string{"url": u}
trans, rec, avg, min, max, err := processPingOutput(out)
if err != nil {
// fatal error
if pendingError != nil {
errorChannel <- pendingError
}
errorChannel <- err
return
}
// Calculate packet loss percentage
loss := float64(trans-rec) / float64(trans) * 100.0
fields := map[string]interface{}{
"packets_transmitted": trans,
"packets_received": rec,
"percent_packet_loss": loss,
}
if avg > 0 {
fields["average_response_ms"] = avg
}
if min > 0 {
fields["minimum_response_ms"] = min
}
if max > 0 {
fields["maximum_response_ms"] = max
}
acc.AddFields("ping", fields, tags)
}(url)
}
wg.Wait()
close(errorChannel)
// Get all errors and return them as one giant error
errorStrings := []string{}
for err := range errorChannel {
errorStrings = append(errorStrings, err.Error())
}
if len(errorStrings) == 0 {
return nil
}
return errors.New(strings.Join(errorStrings, "\n"))
}
func init() {
inputs.Add("ping", func() telegraf.Input {
return &Ping{pingHost: hostPinger}
})
}