| /* |
| * 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" |
| |
| #undef RELEASE_LOG_IF_ALLOWED |
| #define RELEASE_LOG_IF_ALLOWED(fmt, ...) RELEASE_LOG_IF(m_download.isAlwaysOnLoggingAllowed(), 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 < WTF_ARRAY_LENGTH(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() |
| { |
| RELEASE_LOG_IF_ALLOWED("applicationWillEnterForeground (id = %" PRIu64 ")", m_download.downloadID().downloadID()); |
| m_timer.stop(); |
| m_interval = 0; |
| } |
| |
| void DownloadMonitor::applicationDidEnterBackground() |
| { |
| RELEASE_LOG_IF_ALLOWED("applicationDidEnterBackground (id = %" PRIu64 ")", m_download.downloadID().downloadID()); |
| 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 < WTF_ARRAY_LENGTH(throughputIntervals)); |
| if (measuredThroughputRate() < throughputIntervals[m_interval].bytesPerSecond) { |
| RELEASE_LOG_IF_ALLOWED("timerFired: cancelling download (id = %" PRIu64 ")", m_download.downloadID().downloadID()); |
| m_download.cancel(); |
| } else if (m_interval + 1 < WTF_ARRAY_LENGTH(throughputIntervals)) { |
| RELEASE_LOG_IF_ALLOWED("timerFired: sufficient throughput rate (id = %" PRIu64 ")", m_download.downloadID().downloadID()); |
| m_timer.startOneShot(timeUntilNextInterval(m_interval++) / testSpeedMultiplier()); |
| } else |
| RELEASE_LOG_IF_ALLOWED("timerFired: Download reached threshold to not be terminated (id = %" PRIu64 ")", m_download.downloadID().downloadID()); |
| } |
| |
| } // namespace WebKit |