143 lines
3 KiB
Go
143 lines
3 KiB
Go
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//go:generate ../../../tools/readme_config_includer/generator
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package starlark
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import (
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_ "embed"
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"errors"
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"fmt"
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"go.starlark.net/starlark"
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"github.com/influxdata/telegraf"
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common "github.com/influxdata/telegraf/plugins/common/starlark"
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"github.com/influxdata/telegraf/plugins/processors"
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)
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//go:embed sample.conf
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var sampleConfig string
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type Starlark struct {
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common.Common
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results []telegraf.Metric
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}
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func (*Starlark) SampleConfig() string {
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return sampleConfig
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}
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func (s *Starlark) Init() error {
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if err := s.Common.Init(); err != nil {
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return err
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}
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// The source should define an apply function.
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if err := s.AddFunction("apply", &common.Metric{}); err != nil {
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return err
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}
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// Preallocate a slice for return values.
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s.results = make([]telegraf.Metric, 0, 10)
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return nil
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}
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func (*Starlark) Start(telegraf.Accumulator) error {
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return nil
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}
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func (s *Starlark) Add(origMetric telegraf.Metric, acc telegraf.Accumulator) error {
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parameters, found := s.GetParameters("apply")
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if !found {
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return errors.New("the parameters of the apply function could not be found")
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}
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parameters[0].(*common.Metric).Wrap(origMetric)
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returnValue, err := s.Call("apply")
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if err != nil {
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s.LogError(err)
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return err
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}
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switch rv := returnValue.(type) {
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case *starlark.List:
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iter := rv.Iterate()
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defer iter.Done()
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var v starlark.Value
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var origFound bool
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for iter.Next(&v) {
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switch v := v.(type) {
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case *common.Metric:
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m := v.Unwrap()
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if containsMetric(s.results, m) {
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s.Log.Errorf("Duplicate metric reference detected")
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continue
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}
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// Previous metric was found, accept the starlark metric, add
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// the original metric to the accumulator
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if v.ID != 0 {
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origFound = true
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s.results = append(s.results, origMetric)
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acc.AddMetric(origMetric)
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continue
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}
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s.results = append(s.results, m)
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acc.AddMetric(m)
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default:
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s.Log.Errorf("Invalid type returned in list: %s", v.Type())
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}
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}
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// If the script didn't return the original metrics, mark it as
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// successfully handled.
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if !origFound {
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origMetric.Drop()
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}
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// clear results
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for i := range s.results {
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s.results[i] = nil
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}
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s.results = s.results[:0]
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case *common.Metric:
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m := rv.Unwrap()
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// If we got the original metric back, use that and drop the new one.
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// Otherwise mark the original as accepted and use the new metric.
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if rv.ID != 0 {
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acc.AddMetric(origMetric)
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} else {
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origMetric.Accept()
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acc.AddMetric(m)
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}
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case starlark.NoneType:
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origMetric.Drop()
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default:
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return fmt.Errorf("invalid type returned: %T", rv)
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}
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return nil
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}
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func (*Starlark) Stop() {}
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func containsMetric(metrics []telegraf.Metric, target telegraf.Metric) bool {
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for _, m := range metrics {
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if m == target {
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return true
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}
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}
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return false
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}
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func init() {
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processors.AddStreaming("starlark", func() telegraf.StreamingProcessor {
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return &Starlark{
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Common: common.Common{
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StarlarkLoadFunc: common.LoadFunc,
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},
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}
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})
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}
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