sampler-fork/data/sampler.go

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package data
import (
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"fmt"
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"github.com/sqshq/sampler/config"
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"time"
)
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type Sampler struct {
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consumer *Consumer
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items []*Item
triggers []*Trigger
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triggersChannel chan *Sample
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variables []string
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}
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func NewSampler(consumer *Consumer, items []*Item, triggers []*Trigger, options config.Options, fileVariables map[string]string, rateMs int) Sampler {
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ticker := time.NewTicker(time.Duration(rateMs * int(time.Millisecond)))
sampler := Sampler{
consumer,
items,
triggers,
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make(chan *Sample),
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mergeVariables(fileVariables, options.Environment),
}
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go func() {
for ; true; <-ticker.C {
for _, item := range sampler.items {
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go sampler.sample(item, options)
}
}
}()
go func() {
for {
select {
case sample := <-sampler.triggersChannel:
for _, t := range sampler.triggers {
t.Execute(sample)
}
}
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}
}()
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return sampler
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}
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func (s *Sampler) sample(item *Item, options config.Options) {
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val, err := item.nextValue(s.variables)
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if len(val) > 0 {
sample := &Sample{Label: item.label, Value: val, Color: item.color}
s.consumer.SampleChannel <- sample
s.triggersChannel <- sample
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} else if err != nil {
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s.consumer.AlertChannel <- &Alert{
Title: "SAMPLING FAILURE",
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Text: getErrorMessage(err),
Color: item.color,
}
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}
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}
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// option variables takes precedence over the file variables with the same name
func mergeVariables(fileVariables map[string]string, optionsVariables []string) []string {
result := optionsVariables
for key, value := range fileVariables {
result = append([]string{fmt.Sprintf("%s=%s", key, value)}, result...)
}
return result
}