130 lines
2.6 KiB
Go
130 lines
2.6 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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"github.com/bitly/go-simplejson"
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"github.com/gonuts/go-shellquote"
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"github.com/influxdb/telegraf/plugins"
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"os/exec"
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"sync"
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)
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const sampleConfig = `
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# specify commands via an array of tables
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[[exec.commands]]
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# the command to run
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command = "/usr/bin/mycollector --foo=bar"
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# name of the command (used as a prefix for measurements)
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name = "mycollector"
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`
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type Command struct {
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Command string
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Name string
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}
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type Exec struct {
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Commands []*Command
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runner Runner
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}
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type Runner interface {
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Run(string, ...string) ([]byte, error)
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}
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type CommandRunner struct {
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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 (c CommandRunner) Run(command string, args ...string) ([]byte, error) {
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cmd := exec.Command(command, args...)
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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) 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 plugins.Accumulator) error {
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var wg sync.WaitGroup
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var outerr error
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for _, c := range e.Commands {
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wg.Add(1)
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go func(c *Command, acc plugins.Accumulator) {
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defer wg.Done()
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outerr = e.gatherCommand(c, acc)
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}(c, acc)
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}
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wg.Wait()
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return outerr
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}
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func (e *Exec) gatherCommand(c *Command, acc plugins.Accumulator) error {
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words, err := shellquote.Split(c.Command)
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if err != nil || len(words) == 0 {
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return fmt.Errorf("exec: unable to parse command, %s", err)
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}
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out, err := e.runner.Run(words[0], words[1:]...)
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if err != nil {
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return err
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}
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jsonOut, err := simplejson.NewJson(out)
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if err != nil {
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return fmt.Errorf("exec: unable to parse output of '%s' as JSON, %s", c.Command, err)
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}
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return processResponse(acc, c.Name, map[string]string{}, jsonOut.Interface())
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}
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func processResponse(acc plugins.Accumulator, prefix string, tags map[string]string, v interface{}) error {
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switch t := v.(type) {
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case map[string]interface{}:
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for k, v := range t {
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if err := processResponse(acc, prefix+"_"+k, tags, v); err != nil {
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return err
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}
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}
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case json.Number:
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value, err := v.(json.Number).Float64()
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if err != nil {
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return err
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}
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acc.Add(prefix, value, tags)
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case bool, string, []interface{}:
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// ignored types
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return nil
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default:
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return fmt.Errorf("exec: got unexpected type %T with value %v (%s)", t, v, prefix)
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}
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return nil
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}
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func init() {
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plugins.Add("exec", func() plugins.Plugin {
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return NewExec()
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})
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}
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