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limiter.go
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limiter.go
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package conn
import (
"sort"
"sync/atomic"
limiter "github.com/dolfly/core/limiter/conn"
)
type llimiter struct {
limit int
current int64
}
func NewLimiter(n int) limiter.Limiter {
return &llimiter{limit: n}
}
func (l *llimiter) Limit() int {
return l.limit
}
func (l *llimiter) Allow(n int) bool {
if atomic.AddInt64(&l.current, int64(n)) > int64(l.limit) {
if n > 0 {
atomic.AddInt64(&l.current, -int64(n))
}
return false
}
return true
}
type limiterGroup struct {
limiters []limiter.Limiter
}
func newLimiterGroup(limiters ...limiter.Limiter) *limiterGroup {
sort.Slice(limiters, func(i, j int) bool {
return limiters[i].Limit() < limiters[j].Limit()
})
return &limiterGroup{limiters: limiters}
}
func (l *limiterGroup) Allow(n int) (b bool) {
var i int
for i = range l.limiters {
if b = l.limiters[i].Allow(n); !b {
break
}
}
if !b && i > 0 && n > 0 {
for i := range l.limiters[:i] {
l.limiters[i].Allow(-n)
}
}
return
}
func (l *limiterGroup) Limit() int {
if len(l.limiters) == 0 {
return 0
}
return l.limiters[0].Limit()
}