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43 lines
1.6 KiB
C++
Executable File
43 lines
1.6 KiB
C++
Executable File
// Copyright (C) 2022 Check Point Software Technologies Ltd. All rights reserved.
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// Licensed under the Apache License, Version 2.0 (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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#pragma once
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#include <chrono>
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#include <vector>
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namespace Waap {
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namespace Util {
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// Simple rate limiter primitive that collects events() and only allows up to X events per Y seconds.
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// For each event, call RateLimiter::event() passing real or simulated timestamp (in seconds).
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// The returned boolean value will tell the caller whether this event must pass (true) or be blocked (false).
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class RateLimiter {
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public:
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RateLimiter(unsigned int events, std::chrono::seconds interval);
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void clear(const std::chrono::seconds& now);
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bool event(const std::chrono::seconds& now);
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private:
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unsigned m_max_events; // max events allowed during the recent interval window
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std::chrono::seconds m_interval; // configured interval window
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std::vector<unsigned> m_hitsPerSecond; // array of hitcounts per second (remembers up to interval recent seconds)
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unsigned m_recentIdx; // index of recent second
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std::chrono::seconds m_recentHitTime; // timestamp of recent second
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unsigned m_hitsCount; // total events during last interval seconds (rolling update)
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};
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}
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}
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