telegraf/plugins/inputs/exec/exec.go

111 lines
2.3 KiB
Go

package exec
import (
"bytes"
"encoding/json"
"fmt"
"os/exec"
"time"
"github.com/gonuts/go-shellquote"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
const sampleConfig = `
# the command to run
command = "/usr/bin/mycollector --foo=bar"
# Data format to consume. This can be "json" or "influx" (line-protocol)
# NOTE json only reads numerical measurements, strings and booleans are ignored.
data_format = "json"
# measurement name suffix (for separating different commands)
name_suffix = "_mycollector"
`
type Exec struct {
Command string
DataFormat string
runner Runner
}
type Runner interface {
Run(*Exec) ([]byte, error)
}
type CommandRunner struct{}
func (c CommandRunner) Run(e *Exec) ([]byte, error) {
split_cmd, err := shellquote.Split(e.Command)
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:]...)
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)
}
return out.Bytes(), nil
}
func NewExec() *Exec {
return &Exec{runner: CommandRunner{}}
}
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 telegraf.Accumulator) error {
out, err := e.runner.Run(e)
if err != nil {
return err
}
switch e.DataFormat {
case "", "json":
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
}
acc.AddFields("exec", f.Fields, nil)
case "influx":
now := time.Now()
metrics, err := telegraf.ParseMetrics(out)
for _, metric := range metrics {
acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), now)
}
return err
default:
return fmt.Errorf("Unsupported data format: %s. Must be either json "+
"or influx.", e.DataFormat)
}
return nil
}
func init() {
inputs.Add("exec", func() telegraf.Input {
return NewExec()
})
}