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/*
* Copyright (C) 2019 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 "DownloadMonitor.h"
#include "Download.h"
#include "Logging.h"
#define DOWNLOAD_MONITOR_RELEASE_LOG(fmt, ...) RELEASE_LOG(Network, "%p - DownloadMonitor::" fmt, this, ##__VA_ARGS__)
namespace WebKit {
constexpr uint64_t operator"" _kbps(unsigned long long kilobytesPerSecond)
{
return kilobytesPerSecond * 1024;
}
struct ThroughputInterval {
Seconds time;
uint64_t bytesPerSecond;
};
static const ThroughputInterval throughputIntervals[] = {
{ 1_min, 1_kbps },
{ 5_min, 2_kbps },
{ 10_min, 4_kbps },
{ 15_min, 8_kbps },
{ 20_min, 16_kbps },
{ 25_min, 32_kbps },
{ 30_min, 64_kbps },
{ 45_min, 96_kbps },
{ 60_min, 128_kbps }
};
static Seconds timeUntilNextInterval(size_t currentInterval)
{
RELEASE_ASSERT(currentInterval + 1 < std::size(throughputIntervals));
return throughputIntervals[currentInterval + 1].time - throughputIntervals[currentInterval].time;
}
DownloadMonitor::DownloadMonitor(Download& download)
: m_download(download)
{
}
double DownloadMonitor::measuredThroughputRate() const
{
uint64_t bytes { 0 };
for (const auto& timestamp : m_timestamps)
bytes += timestamp.bytesReceived;
if (!bytes)
return 0;
ASSERT(!m_timestamps.isEmpty());
Seconds timeDifference = m_timestamps.last().time.secondsSinceEpoch() - m_timestamps.first().time.secondsSinceEpoch();
double seconds = timeDifference.seconds();
if (!seconds)
return 0;
return bytes / seconds;
}
void DownloadMonitor::downloadReceivedBytes(uint64_t bytesReceived)
{
if (m_timestamps.size() > timestampCapacity - 1) {
ASSERT(m_timestamps.size() == timestampCapacity);
m_timestamps.removeFirst();
}
m_timestamps.append({ MonotonicTime::now(), bytesReceived });
}
void DownloadMonitor::applicationWillEnterForeground()
{
DOWNLOAD_MONITOR_RELEASE_LOG("applicationWillEnterForeground (id = %" PRIu64 ")", m_download.downloadID().toUInt64());
m_timer.stop();
m_interval = 0;
}
void DownloadMonitor::applicationDidEnterBackground()
{
DOWNLOAD_MONITOR_RELEASE_LOG("applicationDidEnterBackground (id = %" PRIu64 ")", m_download.downloadID().toUInt64());
ASSERT(!m_timer.isActive());
ASSERT(!m_interval);
m_timer.startOneShot(throughputIntervals[0].time / testSpeedMultiplier());
}
uint32_t DownloadMonitor::testSpeedMultiplier() const
{
return m_download.testSpeedMultiplier();
}
void DownloadMonitor::timerFired()
{
downloadReceivedBytes(0);
RELEASE_ASSERT(m_interval < std::size(throughputIntervals));
if (measuredThroughputRate() < throughputIntervals[m_interval].bytesPerSecond) {
DOWNLOAD_MONITOR_RELEASE_LOG("timerFired: cancelling download (id = %" PRIu64 ")", m_download.downloadID().toUInt64());
m_download.cancel([](auto&) { }, Download::IgnoreDidFailCallback::No);
} else if (m_interval + 1 < std::size(throughputIntervals)) {
DOWNLOAD_MONITOR_RELEASE_LOG("timerFired: sufficient throughput rate (id = %" PRIu64 ")", m_download.downloadID().toUInt64());
m_timer.startOneShot(timeUntilNextInterval(m_interval++) / testSpeedMultiplier());
} else
DOWNLOAD_MONITOR_RELEASE_LOG("timerFired: Download reached threshold to not be terminated (id = %" PRIu64 ")", m_download.downloadID().toUInt64());
}
} // namespace WebKit
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