180 lines
3.9 KiB
C++
180 lines
3.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "base/unixtime.h"
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#include "logs.h"
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#include <QDateTime>
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#include <QReadWriteLock>
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#ifdef Q_OS_WIN
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#include <windows.h>
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#elif defined Q_OS_MAC
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#include <mach/mach_time.h>
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#else
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#include <time.h>
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#endif
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namespace base {
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namespace unixtime {
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namespace {
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std::atomic<bool> ValueUpdated/* = false*/;
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std::atomic<TimeId> ValueShift/* = 0*/;
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std::atomic<bool> HttpValueValid/* = false*/;
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std::atomic<TimeId> HttpValueShift/* = 0*/;
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class MsgIdManager {
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public:
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MsgIdManager();
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void update();
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[[nodiscard]] uint64 next();
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private:
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void initialize();
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QReadWriteLock _lock;
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uint64 _startId = 0;
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std::atomic<uint32> _incrementedPart = 0;
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uint64 _startCounter = 0;
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uint64 _randomPart = 0;
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float64 _multiplier = 0.;
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};
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MsgIdManager GlobalMsgIdManager;
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[[nodiscard]] float64 GetMultiplier() {
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// 0xFFFF0000 instead of 0x100000000 to make msgId grow slightly slower,
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// than unixtime and we had time to reconfigure.
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#ifdef Q_OS_WIN
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LARGE_INTEGER li;
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QueryPerformanceFrequency(&li);
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return float64(0xFFFF0000L) / float64(li.QuadPart);
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#elif defined Q_OS_MAC // Q_OS_WIN
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mach_timebase_info_data_t tb = { 0, 0 };
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mach_timebase_info(&tb);
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const auto frequency = (float64(tb.numer) / tb.denom) / 1000000.;
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return frequency * (float64(0xFFFF0000L) / 1000.);
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#else // Q_OS_MAC || Q_OS_WIN
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return float64(0xFFFF0000L) / 1000000000.;
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#endif // Q_OS_MAC || Q_OS_WIN
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}
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[[nodiscard]] uint64 GetCounter() {
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#ifdef Q_OS_WIN
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LARGE_INTEGER li;
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QueryPerformanceCounter(&li);
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return li.QuadPart;
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#elif defined Q_OS_MAC // Q_OS_WIN
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return mach_absolute_time();
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#else // Q_OS_MAC || Q_OS_WIN
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timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return 1000000000 * uint64(ts.tv_sec) + uint64(ts.tv_nsec);
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#endif // Q_OS_MAC || Q_OS_WIN
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}
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MsgIdManager::MsgIdManager() {
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auto generator = std::mt19937(std::random_device()());
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auto distribution = std::uniform_int_distribution<uint32>();
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_randomPart = distribution(generator);
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_multiplier = GetMultiplier();
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initialize();
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srand(uint32(_startCounter & 0xFFFFFFFFUL));
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}
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void MsgIdManager::update() {
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QWriteLocker lock(&_lock);
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initialize();
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}
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void MsgIdManager::initialize() {
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_startCounter = GetCounter();
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_startId = ((uint64(uint32(now()))) << 32) | _randomPart;
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}
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uint64 MsgIdManager::next() {
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const auto counter = GetCounter();
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QReadLocker lock(&_lock);
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const auto delta = (counter - _startCounter);
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const auto result = _startId + (uint64)floor(delta * _multiplier);
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lock.unlock();
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return (result & ~0x03L) + (_incrementedPart += 4);
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}
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TimeId local() {
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return (TimeId)time(nullptr);
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}
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} // namespace
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TimeId now() {
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return local() + ValueShift.load();
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}
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void update(TimeId now, bool force) {
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if (force) {
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DEBUG_LOG(("MTP Info: forcing client unixtime to %1"
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).arg(now));
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ValueUpdated = true;
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} else {
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auto expected = false;
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if (!ValueUpdated.compare_exchange_strong(expected, true)) {
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return;
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}
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DEBUG_LOG(("MTP Info: setting client unixtime to %1").arg(now));
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}
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const auto shift = now + 1 - local();
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ValueShift = shift;
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DEBUG_LOG(("MTP Info: now unixtimeDelta is %1").arg(shift));
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HttpValueShift = 0;
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HttpValueValid = false;
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GlobalMsgIdManager.update();
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}
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QDateTime parse(TimeId value) {
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return (value > 0)
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? QDateTime::fromTime_t(value - ValueShift)
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: QDateTime();
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}
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TimeId serialize(const QDateTime &date) {
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return date.isNull() ? TimeId(0) : date.toTime_t() + ValueShift;
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}
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bool http_valid() {
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return HttpValueValid;
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}
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TimeId http_now() {
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return now() + HttpValueShift;
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}
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void http_update(TimeId now) {
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HttpValueShift = now - base::unixtime::now();
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HttpValueValid = true;
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}
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void http_invalidate() {
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HttpValueValid = false;
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}
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uint64 mtproto_msg_id() {
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return GlobalMsgIdManager.next();
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}
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} // namespace unixtime
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} // namespace base
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