mirror of
https://github.com/gogrlx/nats-server.git
synced 2026-04-02 11:48:43 -07:00
66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
// Copyright 2021-2022 The NATS Authors
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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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package server
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import (
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"sync"
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"time"
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)
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type rateCounter struct {
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limit int64
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count int64
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blocked uint64
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end time.Time
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interval time.Duration
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mu sync.Mutex
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}
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func newRateCounter(limit int64) *rateCounter {
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return &rateCounter{
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limit: limit,
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interval: time.Second,
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}
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}
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func (r *rateCounter) allow() bool {
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now := time.Now()
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r.mu.Lock()
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if now.After(r.end) {
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r.count = 0
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r.end = now.Add(r.interval)
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} else {
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r.count++
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}
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allow := r.count < r.limit
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if !allow {
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r.blocked++
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}
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r.mu.Unlock()
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return allow
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}
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func (r *rateCounter) countBlocked() uint64 {
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r.mu.Lock()
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blocked := r.blocked
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r.blocked = 0
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r.mu.Unlock()
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return blocked
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}
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