95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
package exec
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os/exec"
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"github.com/gonuts/go-shellquote"
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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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const sampleConfig = `
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# NOTE This plugin only reads numerical measurements, strings and booleans
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# will be ignored.
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# the command to run
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command = "/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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`
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type Exec struct {
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Command string
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runner Runner
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}
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type Runner interface {
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Run(*Exec) ([]byte, error)
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}
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type CommandRunner struct{}
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func (c CommandRunner) Run(e *Exec) ([]byte, error) {
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split_cmd, err := shellquote.Split(e.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, e.Command)
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}
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return out.Bytes(), nil
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}
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func NewExec() *Exec {
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return &Exec{runner: CommandRunner{}}
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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 flattened metrics from one or more commands that output JSON to stdout"
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}
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func (e *Exec) Gather(acc inputs.Accumulator) error {
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out, err := e.runner.Run(e)
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if err != nil {
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return err
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}
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var jsonOut interface{}
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err = json.Unmarshal(out, &jsonOut)
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if err != nil {
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return fmt.Errorf("exec: unable to parse output of '%s' as JSON, %s",
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e.Command, err)
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}
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f := internal.JSONFlattener{}
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err = f.FlattenJSON("", jsonOut)
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if err != nil {
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return err
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}
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acc.AddFields("exec", f.Fields, nil)
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return nil
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}
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func init() {
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inputs.Add("exec", func() inputs.Input {
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return NewExec()
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})
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}
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