mirror of
https://github.com/cubefs/cubefs.git
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72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
// Copyright 2023 The CubeFS Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package ratelimit
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import (
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"sync"
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"time"
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"gopkg.in/bsm/ratelimit.v1"
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)
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type rateLimitWrapper struct {
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r *ratelimit.RateLimiter
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refCount int
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}
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func newRateLimitWrapper(rate int) *rateLimitWrapper {
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return &rateLimitWrapper{
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r: ratelimit.New(10*rate, 10*time.Second),
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refCount: 0,
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}
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}
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type KeyRateLimit struct {
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mutex sync.RWMutex
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current map[string]*rateLimitWrapper // uid -> ratelimit
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}
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func NewKeyRateLimit() *KeyRateLimit {
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return &KeyRateLimit{current: make(map[string]*rateLimitWrapper)}
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}
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func (k *KeyRateLimit) Acquire(key string, rate int) *ratelimit.RateLimiter {
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k.mutex.Lock()
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limit, ok := k.current[key]
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if !ok {
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limit = newRateLimitWrapper(rate)
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k.current[key] = limit
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}
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limit.refCount++
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k.mutex.Unlock()
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return limit.r
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}
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func (k *KeyRateLimit) Release(key string) {
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k.mutex.Lock()
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defer k.mutex.Unlock()
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limit, ok := k.current[key]
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if !ok {
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panic("key not in map. Possible reason: Release without Acquire.")
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}
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limit.refCount--
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if limit.refCount < 0 {
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panic("internal error: refs < 0")
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}
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if limit.refCount == 0 {
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delete(k.current, key)
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}
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}
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