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package ratelimit
import (
"time"
)
func NewRateLimiter(maxRequests int, window time.Duration) *RateLimiter {
interval := window / time.Duration(maxRequests)
rl := &RateLimiter{
tokens: make(chan struct{}, maxRequests),
done: make(chan struct{}),
}
rl.tokens <- struct{}{}
go func() {
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
select {
case rl.tokens <- struct{}{}:
default:
}
case <-rl.done:
return
}
}
}()
return rl
}
func (r *RateLimiter) Wait() {
<-r.tokens
}
func (r *RateLimiter) Stop() {
close(r.done)
}
func (r *RateLimiter) RemainingRequests() int {
return len(r.tokens)
}
func NewMultiLimiter(limiters ...*RateLimiter) *MultiLimiter {
return &MultiLimiter{
limiters: limiters,
}
}
func (m *MultiLimiter) Wait() {
m.mu.Lock()
defer m.mu.Unlock()
for _, limiter := range m.limiters {
limiter.Wait()
}
}
func (m *MultiLimiter) Stop() {
for _, limiter := range m.limiters {
limiter.Stop()
}
}
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