forked from go-graphite/go-carbon
/
throttle.go
69 lines (54 loc) · 996 Bytes
/
throttle.go
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package persister
import (
"time"
"github.com/lomik/go-carbon/helper"
)
type ThrottleTicker struct {
helper.Stoppable
C chan bool
}
func NewThrottleTicker(ratePerSec int) *ThrottleTicker {
t := &ThrottleTicker{
C: make(chan bool, ratePerSec),
}
t.Start()
if ratePerSec <= 0 {
close(t.C)
return t
}
t.Go(func(exit chan bool) {
defer close(t.C)
delimeter := ratePerSec
chunk := 1
if ratePerSec > 1000 {
minRemainder := ratePerSec
for i := 100; i < 1000; i++ {
if ratePerSec%i < minRemainder {
delimeter = i
minRemainder = ratePerSec % delimeter
}
}
chunk = ratePerSec / delimeter
}
step := time.Duration(1e9/delimeter) * time.Nanosecond
ticker := time.NewTicker(step)
defer ticker.Stop()
LOOP:
for {
select {
case <-ticker.C:
for i := 0; i < chunk; i++ {
select {
case t.C <- true:
//pass
case <-exit:
break LOOP
}
}
case <-exit:
break LOOP
}
}
})
return t
}