132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
package chrony
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import (
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"errors"
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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"time"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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var (
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execCommand = exec.Command // execCommand is used to mock commands in tests.
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)
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type Chrony struct {
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DNSLookup bool `toml:"dns_lookup"`
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path string
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}
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func (*Chrony) Description() string {
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return "Get standard chrony metrics, requires chronyc executable."
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}
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func (*Chrony) SampleConfig() string {
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return `
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## If true, chronyc tries to perform a DNS lookup for the time server.
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# dns_lookup = false
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`
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}
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func (c *Chrony) Gather(acc telegraf.Accumulator) error {
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if len(c.path) == 0 {
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return errors.New("chronyc not found: verify that chrony is installed and that chronyc is in your PATH")
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}
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flags := []string{}
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if !c.DNSLookup {
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flags = append(flags, "-n")
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}
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flags = append(flags, "tracking")
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cmd := execCommand(c.path, flags...)
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out, err := internal.CombinedOutputTimeout(cmd, time.Second*5)
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if err != nil {
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return fmt.Errorf("failed to run command %s: %s - %s", strings.Join(cmd.Args, " "), err, string(out))
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}
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fields, tags, err := processChronycOutput(string(out))
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if err != nil {
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return err
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}
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acc.AddFields("chrony", fields, tags)
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return nil
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}
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// processChronycOutput takes in a string output from the chronyc command, like:
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//
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// Reference ID : 192.168.1.22 (ntp.example.com)
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// Stratum : 3
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// Ref time (UTC) : Thu May 12 14:27:07 2016
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// System time : 0.000020390 seconds fast of NTP time
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// Last offset : +0.000012651 seconds
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// RMS offset : 0.000025577 seconds
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// Frequency : 16.001 ppm slow
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// Residual freq : -0.000 ppm
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// Skew : 0.006 ppm
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// Root delay : 0.001655 seconds
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// Root dispersion : 0.003307 seconds
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// Update interval : 507.2 seconds
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// Leap status : Normal
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//
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// The value on the left side of the colon is used as field name, if the first field on
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// the right side is a float. If it cannot be parsed as float, it is a tag name.
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//
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// Ref time is ignored and all names are converted to snake case.
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//
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// It returns (<fields>, <tags>)
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func processChronycOutput(out string) (map[string]interface{}, map[string]string, error) {
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tags := map[string]string{}
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fields := map[string]interface{}{}
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lines := strings.Split(strings.TrimSpace(out), "\n")
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for _, line := range lines {
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stats := strings.Split(line, ":")
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if len(stats) < 2 {
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return nil, nil, fmt.Errorf("unexpected output from chronyc, expected ':' in %s", out)
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}
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name := strings.ToLower(strings.Replace(strings.TrimSpace(stats[0]), " ", "_", -1))
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// ignore reference time
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if strings.Contains(name, "ref_time") {
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continue
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}
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valueFields := strings.Fields(stats[1])
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if len(valueFields) == 0 {
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return nil, nil, fmt.Errorf("unexpected output from chronyc: %s", out)
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}
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if strings.Contains(strings.ToLower(name), "stratum") {
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tags["stratum"] = valueFields[0]
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continue
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}
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if strings.Contains(strings.ToLower(name), "reference_id") {
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tags["reference_id"] = valueFields[0]
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continue
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}
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value, err := strconv.ParseFloat(valueFields[0], 64)
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if err != nil {
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tags[name] = strings.ToLower(strings.Join(valueFields, " "))
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continue
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}
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if strings.Contains(stats[1], "slow") {
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value = -value
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}
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fields[name] = value
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}
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return fields, tags, nil
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}
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func init() {
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c := Chrony{}
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path, _ := exec.LookPath("chronyc")
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if len(path) > 0 {
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c.path = path
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}
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inputs.Add("chrony", func() telegraf.Input {
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return &c
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})
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}
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