56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
/*
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* Copyright 1999-2020 Alibaba Group Holding Ltd.
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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 implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package config_client
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import (
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"sync"
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"time"
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"github.com/nacos-group/nacos-sdk-go/v2/clients/cache"
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"golang.org/x/time/rate"
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)
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type rateLimiterCheck struct {
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rateLimiterCache cache.ConcurrentMap // cache
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mux sync.Mutex
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}
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var checker rateLimiterCheck
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func init() {
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checker = rateLimiterCheck{
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rateLimiterCache: cache.NewConcurrentMap(),
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mux: sync.Mutex{},
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}
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}
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// IsLimited return true when request is limited
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func IsLimited(checkKey string) bool {
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checker.mux.Lock()
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defer checker.mux.Unlock()
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var limiter *rate.Limiter
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lm, exist := checker.rateLimiterCache.Get(checkKey)
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if !exist {
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// define a new limiter,allow 5 times per second,and reserve stock is 5.
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limiter = rate.NewLimiter(rate.Limit(5), 5)
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checker.rateLimiterCache.Set(checkKey, limiter)
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} else {
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limiter = lm.(*rate.Limiter)
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}
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add := time.Now().Add(time.Second)
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return !limiter.AllowN(add, 1)
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}
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