155 lines
3.4 KiB
Go
155 lines
3.4 KiB
Go
// +build !windows
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package varnish
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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"
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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/registry/inputs"
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)
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type runner func(cmdName string) (*bytes.Buffer, error)
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// Varnish is used to store configuration values
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type Varnish struct {
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Stats []string
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Binary string
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filter filter.Filter
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run runner
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}
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var defaultStats = []string{"MAIN.cache_hit", "MAIN.cache_miss", "MAIN.uptime"}
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var defaultBinary = "/usr/bin/varnishstat"
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var sampleConfig = `
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## The default location of the varnishstat binary can be overridden with:
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binary = "/usr/bin/varnishstat"
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## By default, telegraf gather stats for 3 metric points.
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## Setting stats will override the defaults shown below.
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## Glob matching can be used, ie, stats = ["MAIN.*"]
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## stats may also be set to ["*"], which will collect all stats
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stats = ["MAIN.cache_hit", "MAIN.cache_miss", "MAIN.uptime"]
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`
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func (s *Varnish) Description() string {
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return "A plugin to collect stats from Varnish HTTP Cache"
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}
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// SampleConfig displays configuration instructions
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func (s *Varnish) SampleConfig() string {
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return sampleConfig
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}
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// Shell out to varnish_stat and return the output
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func varnishRunner(cmdName string) (*bytes.Buffer, error) {
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cmdArgs := []string{"-1"}
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cmd := exec.Command(cmdName, cmdArgs...)
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var out bytes.Buffer
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cmd.Stdout = &out
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err := internal.RunTimeout(cmd, time.Millisecond*200)
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if err != nil {
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return &out, fmt.Errorf("error running varnishstat: %s", err)
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}
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return &out, nil
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}
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// Gather collects the configured stats from varnish_stat and adds them to the
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// Accumulator
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//
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// The prefix of each stat (eg MAIN, MEMPOOL, LCK, etc) will be used as a
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// 'section' tag and all stats that share that prefix will be reported as fields
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// with that tag
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func (s *Varnish) Gather(acc telegraf.Accumulator) error {
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if s.filter == nil {
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var err error
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if len(s.Stats) == 0 {
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s.filter, err = filter.Compile(defaultStats)
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} else {
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// legacy support, change "all" -> "*":
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if s.Stats[0] == "all" {
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s.Stats[0] = "*"
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}
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s.filter, err = filter.Compile(s.Stats)
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}
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if err != nil {
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return err
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}
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}
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out, err := s.run(s.Binary)
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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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sectionMap := make(map[string]map[string]interface{})
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scanner := bufio.NewScanner(out)
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for scanner.Scan() {
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cols := strings.Fields(scanner.Text())
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if len(cols) < 2 {
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continue
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}
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if !strings.Contains(cols[0], ".") {
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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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if s.filter != nil && !s.filter.Match(stat) {
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continue
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}
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parts := strings.SplitN(stat, ".", 2)
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section := parts[0]
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field := parts[1]
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// Init the section if necessary
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if _, ok := sectionMap[section]; !ok {
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sectionMap[section] = make(map[string]interface{})
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}
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sectionMap[section][field], err = strconv.ParseUint(value, 10, 64)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Expected a numeric value for %s = %v\n",
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stat, value)
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}
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}
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for section, fields := range sectionMap {
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tags := map[string]string{
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"section": section,
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}
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if len(fields) == 0 {
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continue
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}
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acc.AddFields("varnish", fields, tags)
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}
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return nil
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}
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func init() {
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inputs.Add("varnish", func() telegraf.Input {
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return &Varnish{
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run: varnishRunner,
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Stats: defaultStats,
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Binary: defaultBinary,
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}
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})
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}
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