138 lines
3.2 KiB
Go
138 lines
3.2 KiB
Go
package unbound
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import (
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"bufio"
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"bytes"
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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/filter"
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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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type runner func(cmdName string, Timeout internal.Duration, UseSudo bool) (*bytes.Buffer, error)
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// Unbound is used to store configuration values
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type Unbound struct {
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Binary string
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Timeout internal.Duration
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UseSudo bool
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filter filter.Filter
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run runner
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}
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var defaultBinary = "/usr/sbin/unbound-control"
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var defaultTimeout = internal.Duration{Duration: time.Second}
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var sampleConfig = `
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## If running as a restricted user you can prepend sudo for additional access:
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#use_sudo = false
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## The default location of the unbound-control binary can be overridden with:
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binary = "/usr/sbin/unbound-control"
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## The default timeout of 1s can be overriden with:
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timeout = "1s"
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## Use the builtin fielddrop/fieldpass telegraf filters in order to keep/remove specific fields
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fieldpass = ["total_*", "num_*","time_up", "mem_*"]
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`
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func (s *Unbound) Description() string {
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return "A plugin to collect stats from Unbound - a validating, recursive, and caching DNS resolver"
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}
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// SampleConfig displays configuration instructions
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func (s *Unbound) SampleConfig() string {
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return sampleConfig
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}
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// Shell out to unbound_stat and return the output
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func unboundRunner(cmdName string, Timeout internal.Duration, UseSudo bool) (*bytes.Buffer, error) {
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cmdArgs := []string{"stats_noreset"}
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cmd := exec.Command(cmdName, cmdArgs...)
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if UseSudo {
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cmdArgs = append([]string{cmdName}, cmdArgs...)
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cmd = exec.Command("sudo", cmdArgs...)
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}
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var out bytes.Buffer
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cmd.Stdout = &out
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err := internal.RunTimeout(cmd, Timeout.Duration)
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if err != nil {
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return &out, fmt.Errorf("error running unbound-control: %s", err)
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}
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return &out, nil
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}
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// Gather collects stats from unbound-control and adds them to the Accumulator
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//
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// All the dots in stat name will replaced by underscores. Histogram statistics will not be collected.
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func (s *Unbound) Gather(acc telegraf.Accumulator) error {
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// Always exclude histrogram statistics
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stat_excluded := []string{"histogram.*"}
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filter_excluded, err := filter.Compile(stat_excluded)
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if err != nil {
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return err
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}
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out, err := s.run(s.Binary, s.Timeout, s.UseSudo)
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if err != nil {
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return fmt.Errorf("error gathering metrics: %s", err)
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}
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// Process values
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fields := make(map[string]interface{})
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scanner := bufio.NewScanner(out)
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for scanner.Scan() {
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cols := strings.Split(scanner.Text(), "=")
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// Check split correctness
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if len(cols) != 2 {
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continue
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}
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stat := cols[0]
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value := cols[1]
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// Filter value
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if filter_excluded.Match(stat) {
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continue
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}
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field := strings.Replace(stat, ".", "_", -1)
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fields[field], err = strconv.ParseFloat(value, 64)
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if err != nil {
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acc.AddError(fmt.Errorf("Expected a numerical value for %s = %v\n",
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stat, value))
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}
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}
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acc.AddFields("unbound", fields, nil)
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return nil
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}
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func init() {
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inputs.Add("unbound", func() telegraf.Input {
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return &Unbound{
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run: unboundRunner,
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Binary: defaultBinary,
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Timeout: defaultTimeout,
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UseSudo: false,
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}
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})
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}
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