telegraf/plugins/exec/exec.go

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package exec
import (
"bytes"
"encoding/json"
"fmt"
"os/exec"
"github.com/gonuts/go-shellquote"
"github.com/influxdb/telegraf/internal"
"github.com/influxdb/telegraf/plugins"
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)
const sampleConfig = `
# the command to run
command = "/usr/bin/mycollector --foo=bar"
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# name of the command (used as a prefix for measurements)
name = "mycollector"
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`
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type Exec struct {
Command string
Name string
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runner Runner
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}
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type Runner interface {
Run(*Exec) ([]byte, error)
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}
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type CommandRunner struct{}
func (c CommandRunner) Run(e *Exec) ([]byte, error) {
split_cmd, err := shellquote.Split(e.Command)
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if err != nil || len(split_cmd) == 0 {
return nil, fmt.Errorf("exec: unable to parse command, %s", err)
}
cmd := exec.Command(split_cmd[0], split_cmd[1:]...)
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var out bytes.Buffer
cmd.Stdout = &out
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("exec: %s for command '%s'", err, e.Command)
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}
return out.Bytes(), nil
}
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func NewExec() *Exec {
return &Exec{runner: CommandRunner{}}
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}
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func (e *Exec) SampleConfig() string {
return sampleConfig
}
func (e *Exec) Description() string {
return "Read flattened metrics from one or more commands that output JSON to stdout"
}
func (e *Exec) Gather(acc plugins.Accumulator) error {
out, err := e.runner.Run(e)
if err != nil {
return err
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}
var jsonOut interface{}
err = json.Unmarshal(out, &jsonOut)
if err != nil {
return fmt.Errorf("exec: unable to parse output of '%s' as JSON, %s",
e.Command, err)
}
f := internal.JSONFlattener{}
err = f.FlattenJSON("", jsonOut)
if err != nil {
return err
}
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var msrmnt_name string
if e.Name == "" {
msrmnt_name = "exec"
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} else {
msrmnt_name = "exec_" + e.Name
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}
acc.AddFields(msrmnt_name, f.Fields, nil)
return nil
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}
func init() {
plugins.Add("exec", func() plugins.Plugin {
return NewExec()
})
}