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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package v1 | ||
|
|
||
| import ( | ||
| "runtime" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
| ) | ||
|
|
||
| type token struct { | ||
| rps uint32 | ||
| lastUse time.Time | ||
| } | ||
|
|
||
| type TokensBucket struct { | ||
| maxRPS uint32 | ||
| mux sync.Mutex | ||
| tokens map[string]*token | ||
| unusedTokenTime time.Duration | ||
| checkTokenTime time.Duration | ||
| cancel atomic.Bool | ||
| } | ||
|
|
||
| func NewTokensBucket(maxRPS uint32, unusedTokenTime, checkTokenTime time.Duration) *TokensBucket { | ||
| bucket := &TokensBucket{ | ||
| maxRPS: maxRPS, | ||
| tokens: map[string]*token{}, | ||
| unusedTokenTime: unusedTokenTime, | ||
| checkTokenTime: checkTokenTime, | ||
| } | ||
|
|
||
| go bucket.deleteUnusedToken() | ||
| runtime.SetFinalizer(bucket, destructBasket) | ||
| return bucket | ||
| } | ||
|
|
||
| func (m *TokensBucket) Obtain(id string) { | ||
| m.mux.Lock() | ||
| defer m.mux.Unlock() | ||
|
|
||
| if _, ok := m.tokens[id]; !ok { | ||
| m.tokens[id] = &token{ | ||
| lastUse: time.Now(), | ||
| rps: 1, | ||
| } | ||
| return | ||
| } | ||
|
|
||
| sleepTime := time.Second - time.Since(m.tokens[id].lastUse) | ||
| if sleepTime < 0 { | ||
| m.tokens[id].lastUse = time.Now() | ||
| m.tokens[id].rps = 0 | ||
| } else if m.tokens[id].rps >= m.maxRPS { | ||
| time.Sleep(sleepTime) | ||
| m.tokens[id].lastUse = time.Now() | ||
| m.tokens[id].rps = 0 | ||
| } | ||
| m.tokens[id].rps++ | ||
| } | ||
|
|
||
| func destructBasket(m *TokensBucket) { | ||
| m.cancel.Store(true) | ||
| } | ||
|
|
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| func (m *TokensBucket) deleteUnusedToken() { | ||
| for { | ||
| if m.cancel.Load() { | ||
| return | ||
| } | ||
| m.mux.Lock() | ||
|
|
||
| for id, token := range m.tokens { | ||
| if time.Since(token.lastUse) >= m.unusedTokenTime { | ||
| delete(m.tokens, id) | ||
| } | ||
| } | ||
| m.mux.Unlock() | ||
|
|
||
| time.Sleep(m.checkTokenTime) | ||
| } | ||
| } |
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