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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/CompletionHandler.h>
#include <wtf/ContinuousApproximateTime.h>
#include <wtf/HashMap.h>
#include <wtf/PriorityQueue.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class ResourceMonitorPersistence;
class ResourceMonitorThrottler final {
WTF_MAKE_FAST_ALLOCATED;
public:
ResourceMonitorThrottler(String&& databasePath, size_t count, Seconds duration, size_t maxHosts);
~ResourceMonitorThrottler();
void openDatabase(String&& path);
void closeDatabase();
void recordAccess(const String& host, ContinuousApproximateTime);
bool tryAccess(const String& host, ContinuousApproximateTime);
void clearAllData();
void setCountPerDuration(size_t count, Seconds duration);
static constexpr size_t defaultThrottleAccessCount = 5;
static constexpr Seconds defaultThrottleDuration = 24_h;
static constexpr size_t defaultMaxHosts = 100;
private:
struct Config {
size_t count;
Seconds duration;
size_t maxHosts;
};
class AccessThrottler final {
WTF_MAKE_FAST_ALLOCATED;
public:
AccessThrottler() = default;
bool tryAccessAndUpdateHistory(ContinuousApproximateTime, const Config&);
bool tryExpire(ContinuousApproximateTime, const Config&);
ContinuousApproximateTime oldestAccessTime() const;
ContinuousApproximateTime newestAccessTime() const { return m_newestAccessTime; }
private:
void removeExpired(ContinuousApproximateTime);
PriorityQueue<ContinuousApproximateTime> m_accessTimes;
ContinuousApproximateTime m_newestAccessTime { -ContinuousApproximateTime::infinity() };
};
AccessThrottler& throttlerForHost(const String& host);
void removeExpiredThrottler();
void removeOldestThrottler();
void maintainHosts(ContinuousApproximateTime);
Config m_config;
HashMap<String, AccessThrottler> m_throttlersByHost;
std::unique_ptr<ResourceMonitorPersistence> m_persistence;
};
}
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