64 lines
1.1 KiB
Go
64 lines
1.1 KiB
Go
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package amoClient
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import (
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"context"
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"sync"
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"time"
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)
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type RateLimiter struct {
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requests chan struct{}
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done chan struct{}
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maxRequests int
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interval time.Duration
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mutex sync.Mutex
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cancel context.CancelFunc
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}
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func NewRateLimiter(ctx context.Context, maxRequests int, interval time.Duration) *RateLimiter {
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limiter := &RateLimiter{
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requests: make(chan struct{}, maxRequests),
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done: make(chan struct{}),
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maxRequests: maxRequests,
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interval: interval,
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}
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ctx, cancel := context.WithCancel(ctx)
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limiter.cancel = cancel
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go limiter.start(ctx)
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return limiter
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}
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func (limiter *RateLimiter) start(ctx context.Context) {
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ticker := time.NewTicker(limiter.interval)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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limiter.mutex.Lock()
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for i := 0; i < len(limiter.requests); i++ {
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<-limiter.requests
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}
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limiter.mutex.Unlock()
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case <-ctx.Done():
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return
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}
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}
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}
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func (limiter *RateLimiter) Check() bool {
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select {
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case limiter.requests <- struct{}{}:
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return true
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default:
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return false
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}
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}
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func (limiter *RateLimiter) Stop(ctx context.Context) error {
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limiter.cancel()
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return nil
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}
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