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53 lines
864 B
53 lines
864 B
package redis
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import (
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"sync/atomic"
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"time"
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)
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type rateLimiter struct {
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v int64
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_closed int64
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}
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func newRateLimiter(limit time.Duration, bucketSize int) *rateLimiter {
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rl := &rateLimiter{
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v: int64(bucketSize),
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}
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go rl.loop(limit, int64(bucketSize))
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return rl
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}
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func (rl *rateLimiter) loop(limit time.Duration, bucketSize int64) {
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for {
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if rl.closed() {
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break
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}
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if v := atomic.LoadInt64(&rl.v); v < bucketSize {
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atomic.AddInt64(&rl.v, 1)
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}
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time.Sleep(limit)
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}
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}
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func (rl *rateLimiter) Check() bool {
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for {
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if v := atomic.LoadInt64(&rl.v); v > 0 {
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if atomic.CompareAndSwapInt64(&rl.v, v, v-1) {
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return true
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}
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} else {
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return false
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}
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}
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}
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func (rl *rateLimiter) Close() error {
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atomic.StoreInt64(&rl._closed, 1)
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return nil
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}
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func (rl *rateLimiter) closed() bool {
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return atomic.LoadInt64(&rl._closed) == 1
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}
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