telegraf/plugins/inputs/trig/trig.go

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package trig
import (
"math"
"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
type Trig struct {
x float64
Amplitude float64
}
var TrigConfig = `
## Set the amplitude
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amplitude = 10.0
`
func (s *Trig) SampleConfig() string {
return TrigConfig
}
func (s *Trig) Description() string {
return "Inserts sine and cosine waves for demonstration purposes"
}
func (s *Trig) Gather(acc telegraf.Accumulator) error {
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sinner := math.Sin((s.x*math.Pi)/5.0) * s.Amplitude
cosinner := math.Cos((s.x*math.Pi)/5.0) * s.Amplitude
fields := make(map[string]interface{})
fields["sine"] = sinner
fields["cosine"] = cosinner
tags := make(map[string]string)
s.x += 1.0
acc.AddFields("trig", fields, tags)
return nil
}
func init() {
inputs.Add("trig", func() telegraf.Input { return &Trig{x: 0.0} })
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}