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package rate
import "time"
type Limiter struct {
limit float64
rate float64
lastRefill time.Time
tokens float64
}
// rate refills limiter rate tokens per second
func NewLimiter(rate float64, limit float64) Limiter {
return Limiter{
limit: limit,
rate: rate,
lastRefill: time.Now().UTC(),
tokens: limit,
}
}
func (rl *Limiter) Fill() {
rl.update()
rl.tokens = rl.limit
}
func (rl *Limiter) SetRate(rate float64) {
rl.update()
rl.rate = rate
}
func (rl *Limiter) SetLimit(limit float64) {
rl.update()
rl.limit = limit
}
func (rl *Limiter) Take(tokens float64) bool {
rl.update()
has := rl.Has(tokens)
if has {
rl.tokens -= tokens
return true
}
return false
}
func (rl *Limiter) Has(tokens float64) bool {
rl.update()
return rl.tokens >= tokens
}
func (rl *Limiter) update() {
lastRefill := rl.lastRefill
rl.lastRefill = time.Now().UTC()
rl.tokens += min(time.Since(lastRefill).Seconds()*rl.rate, rl.limit)
}
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