134 lines
2.6 KiB
Go
134 lines
2.6 KiB
Go
package exec
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import (
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"bytes"
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"fmt"
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"os/exec"
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"sync"
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"github.com/gonuts/go-shellquote"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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"github.com/influxdata/telegraf/plugins/parsers"
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)
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const sampleConfig = `
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### Commands array
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commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
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### measurement name suffix (for separating different commands)
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name_suffix = "_mycollector"
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### Data format to consume. This can be "json", "influx" or "graphite"
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### Each data format has it's own unique set of configuration options, read
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### more about them here:
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### https://github.com/influxdata/telegraf/blob/master/DATA_FORMATS_INPUT.md
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data_format = "influx"
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`
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type Exec struct {
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Commands []string
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Command string
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parser parsers.Parser
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wg sync.WaitGroup
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runner Runner
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errChan chan error
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}
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func NewExec() *Exec {
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return &Exec{
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runner: CommandRunner{},
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}
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}
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type Runner interface {
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Run(*Exec, string) ([]byte, error)
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}
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type CommandRunner struct{}
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func (c CommandRunner) Run(e *Exec, command string) ([]byte, error) {
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split_cmd, err := shellquote.Split(command)
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if err != nil || len(split_cmd) == 0 {
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return nil, fmt.Errorf("exec: unable to parse command, %s", err)
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}
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cmd := exec.Command(split_cmd[0], split_cmd[1:]...)
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var out bytes.Buffer
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cmd.Stdout = &out
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if err := cmd.Run(); err != nil {
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return nil, fmt.Errorf("exec: %s for command '%s'", err, command)
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}
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return out.Bytes(), nil
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}
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func (e *Exec) ProcessCommand(command string, acc telegraf.Accumulator) {
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defer e.wg.Done()
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out, err := e.runner.Run(e, command)
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if err != nil {
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e.errChan <- err
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return
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}
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metrics, err := e.parser.Parse(out)
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if err != nil {
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e.errChan <- err
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} else {
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for _, metric := range metrics {
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acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
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}
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}
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}
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func (e *Exec) SampleConfig() string {
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return sampleConfig
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}
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func (e *Exec) Description() string {
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return "Read metrics from one or more commands that can output to stdout"
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}
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func (e *Exec) SetParser(parser parsers.Parser) {
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e.parser = parser
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}
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func (e *Exec) Gather(acc telegraf.Accumulator) error {
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// Legacy single command support
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if e.Command != "" {
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e.Commands = append(e.Commands, e.Command)
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e.Command = ""
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}
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e.errChan = make(chan error, len(e.Commands))
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e.wg.Add(len(e.Commands))
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for _, command := range e.Commands {
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go e.ProcessCommand(command, acc)
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}
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e.wg.Wait()
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select {
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default:
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close(e.errChan)
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return nil
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case err := <-e.errChan:
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close(e.errChan)
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return err
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}
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}
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func init() {
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inputs.Add("exec", func() telegraf.Input {
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return NewExec()
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})
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}
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