mirror of
https://tildegit.org/solderpunk/molly-brown
synced 2024-05-13 16:46:03 +02:00
51 lines
829 B
Go
51 lines
829 B
Go
package main
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import (
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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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mu sync.Mutex
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bucket map[string]int
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rate int
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burst int
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}
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func newRateLimiter(rate int, burst int) RateLimiter {
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var rl = new(RateLimiter)
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rl.bucket = make(map[string]int)
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rl.rate = rate
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rl.burst = burst
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// Leak periodically
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go func () {
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for(true) {
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rl.mu.Lock()
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for addr, drips := range rl.bucket {
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if drips <= rate {
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delete(rl.bucket, addr)
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} else {
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rl.bucket[addr] = drips - rl.rate
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}
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}
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rl.mu.Unlock()
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time.Sleep(time.Second)
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}
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}()
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return *rl
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}
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func (rl *RateLimiter) Allowed(addr string) (int, bool) {
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rl.mu.Lock()
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defer rl.mu.Unlock()
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drips, present := rl.bucket[addr]
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if !present {
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rl.bucket[addr] = 1
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return 1, true
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}
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drips += 1
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rl.bucket[addr] = drips
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return drips, drips < rl.burst
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}
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