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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.
*/
#include "config.h"
#include "ResourceMonitorThrottlerHolder.h"
#include "ResourceMonitorThrottler.h"
#include "SQLiteDatabase.h"
#include <wtf/CrossThreadCopier.h>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/Seconds.h>
#include <wtf/StdLibExtras.h>
#if ENABLE(CONTENT_EXTENSIONS)
namespace WebCore {
Ref<WorkQueue> ResourceMonitorThrottlerHolder::sharedWorkQueueSingleton()
{
static LazyNeverDestroyed<Ref<WorkQueue>> workQueue;
static std::once_flag onceKey;
std::call_once(onceKey, [] {
workQueue.construct(WorkQueue::create("ResourceMonitorThrottlerHolder Work Queue"_s));
});
return workQueue.get();
}
Ref<ResourceMonitorThrottlerHolder> ResourceMonitorThrottlerHolder::create()
{
return create(ResourceMonitorThrottler::defaultThrottleAccessCount, ResourceMonitorThrottler::defaultThrottleDuration, ResourceMonitorThrottler::defaultMaxHosts);
}
Ref<ResourceMonitorThrottlerHolder> ResourceMonitorThrottlerHolder::create(size_t count, Seconds duration, size_t maxHosts)
{
return create(SQLiteDatabase::inMemoryPath(), count, duration, maxHosts);
}
Ref<ResourceMonitorThrottlerHolder> ResourceMonitorThrottlerHolder::create(const String& databasePath)
{
return create(databasePath, ResourceMonitorThrottler::defaultThrottleAccessCount, ResourceMonitorThrottler::defaultThrottleDuration, ResourceMonitorThrottler::defaultMaxHosts);
}
Ref<ResourceMonitorThrottlerHolder> ResourceMonitorThrottlerHolder::create(const String& databasePath, size_t count, Seconds duration, size_t maxHosts)
{
return adoptRef(*new ResourceMonitorThrottlerHolder(databasePath, count, duration, maxHosts));
}
ResourceMonitorThrottlerHolder::ResourceMonitorThrottlerHolder(const String& databasePath, size_t count, Seconds duration, size_t maxHosts)
{
ASSERT(isMainThread());
sharedWorkQueueSingleton()->dispatch([weakThis = ThreadSafeWeakPtr { *this }, path = crossThreadCopy(databasePath), count, duration, maxHosts] mutable {
if (RefPtr protectedThis = weakThis.get())
protectedThis->m_throttler = makeUnique<ResourceMonitorThrottler>(WTFMove(path), count, duration, maxHosts);
});
}
ResourceMonitorThrottlerHolder::~ResourceMonitorThrottlerHolder()
{
ASSERT(isMainThread());
sharedWorkQueueSingleton()->dispatch([container = WTFMove(m_throttler)] { });
}
void ResourceMonitorThrottlerHolder::tryAccess(const String& host, ContinuousApproximateTime time, CompletionHandler<void(bool)>&& completionHandler)
{
ASSERT(isMainThread());
if (host.isEmpty()) {
completionHandler(false);
return;
}
sharedWorkQueueSingleton()->dispatch([weakThis = ThreadSafeWeakPtr { *this }, host = crossThreadCopy(host), time, completionHandler = WTFMove(completionHandler)] mutable {
RefPtr protectedThis = weakThis.get();
bool wasGranted = protectedThis && protectedThis->m_throttler->tryAccess(host, time);
callOnMainThread([wasGranted, completionHandler = WTFMove(completionHandler)] mutable {
completionHandler(wasGranted);
});
});
}
void ResourceMonitorThrottlerHolder::clearAllData(CompletionHandler<void()>&& completionHandler)
{
ASSERT(isMainThread());
sharedWorkQueueSingleton()->dispatch([weakThis = ThreadSafeWeakPtr { *this }, completionHandler = WTFMove(completionHandler)] mutable {
if (RefPtr protectedThis = weakThis.get())
protectedThis->m_throttler->clearAllData();
callOnMainThread(WTFMove(completionHandler));
});
}
void ResourceMonitorThrottlerHolder::setCountPerDuration(size_t count, Seconds duration)
{
ASSERT(isMainThread());
sharedWorkQueueSingleton()->dispatch([weakThis = ThreadSafeWeakPtr { *this }, count, duration] mutable {
if (RefPtr protectedThis = weakThis.get())
protectedThis->m_throttler->setCountPerDuration(count, duration);
});
}
} // namespace WebCore
#endif
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