renaming plugins -> inputs

plugins/inputs/exec/exec.go

@@ -0,0 +1,91 @@
+package exec
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"os/exec"
+
+	"github.com/gonuts/go-shellquote"
+
+	"github.com/influxdb/telegraf/internal"
+	"github.com/influxdb/telegraf/plugins/inputs"
+)
+
+const sampleConfig = `
+  # the command to run
+  command = "/usr/bin/mycollector --foo=bar"
+
+  # measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+`
+
+type Exec struct {
+	Command 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 inputs.Accumulator) error {
+	out, err := e.runner.Run(e)
+	if err != nil {
+		return err
+	}
+
+	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)
+	return nil
+}
+
+func init() {
+	inputs.Add("exec", func() inputs.Input {
+		return NewExec()
+	})
+}