148 lines
2.9 KiB
Go
148 lines
2.9 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/gonuts/go-shellquote"
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"github.com/influxdb/telegraf/plugins"
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"math"
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"os/exec"
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"sync"
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"time"
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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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# Only run this command if it has been at least this many
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# seconds since it last ran
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interval = 10
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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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clock Clock
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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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Interval int
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lastRunAt time.Time
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}
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type Runner interface {
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Run(*Command) ([]byte, error)
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}
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type Clock interface {
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Now() time.Time
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}
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type CommandRunner struct{}
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type RealClock struct{}
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func (c CommandRunner) Run(command *Command) ([]byte, error) {
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command.lastRunAt = time.Now()
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split_cmd, err := shellquote.Split(command.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, command.Command)
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}
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return out.Bytes(), nil
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}
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func (c RealClock) Now() time.Time {
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return time.Now()
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}
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func NewExec() *Exec {
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return &Exec{runner: CommandRunner{}, clock: RealClock{}}
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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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secondsSinceLastRun := 0.0
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if c.lastRunAt.Unix() == 0 { // means time is uninitialized
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secondsSinceLastRun = math.Inf(1)
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} else {
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secondsSinceLastRun = (e.clock.Now().Sub(c.lastRunAt)).Seconds()
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}
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if secondsSinceLastRun >= float64(c.Interval) {
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out, err := e.runner.Run(c)
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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", c.Command, err)
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}
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processResponse(acc, c.Name, map[string]string{}, jsonOut)
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}
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return nil
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}
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func processResponse(acc plugins.Accumulator, prefix string, tags map[string]string, v interface{}) {
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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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processResponse(acc, prefix+"_"+k, tags, v)
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}
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case float64:
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acc.Add(prefix, v, tags)
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}
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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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