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add thread-safe tockenbucket touch() function #42

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add thread-safe tockenbucket touch() function #42

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27 changes: 17 additions & 10 deletions tokenbucket/bucket.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package tokenbucket

import (
"math/rand"
"sync/atomic"
"time"
)

Expand Down Expand Up @@ -43,19 +44,25 @@ func New(num int, rate float64, depth uint64) *Filter {

func (b *Filter) touch(it *item) bool {
now := uint64(time.Now().UnixNano())
delta := now - it.prev
it.credit += delta
it.prev = now
oldPrev := atomic.LoadUint64(&it.prev)
oldCredit := atomic.LoadUint64(&it.credit)

if it.credit > b.creditMax {
it.credit = b.creditMax
}
delta := now - oldPrev
defer atomic.StoreUint64(&it.prev, now)

newCredit := oldCredit + delta
allow := false

if it.credit > b.touchCost {
it.credit -= b.touchCost
return true
if newCredit > b.creditMax {
newCredit = b.creditMax
}
return false
if newCredit > b.touchCost {
newCredit -= b.touchCost
allow = true
}
atomic.StoreUint64(&it.credit, newCredit)

return allow
}

// Touch finds the token bucket for d, takes a token out of it and reports if
Expand Down