// Copyright (c) 2024-present The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std::chrono_literals; void TimeOffsets::Add(std::chrono::seconds offset) { LOCK(m_mutex); if (m_offsets.size() >= MAX_SIZE) { m_offsets.pop_front(); } m_offsets.push_back(offset); LogDebug(BCLog::NET, "Added time offset %+ds, total samples %d\n", Ticks(offset), m_offsets.size()); } std::chrono::seconds TimeOffsets::Median() const { LOCK(m_mutex); // Only calculate the median if we have 5 or more offsets if (m_offsets.size() < 5) return 0s; auto sorted_copy = m_offsets; std::sort(sorted_copy.begin(), sorted_copy.end()); return sorted_copy[sorted_copy.size() / 2]; // approximate median is good enough, keep it simple } bool TimeOffsets::WarnIfOutOfSync() const { // when median == std::numeric_limits::min(), calling std::chrono::abs is UB auto median{std::max(Median(), std::chrono::seconds(std::numeric_limits::min() + 1))}; if (std::chrono::abs(median) <= WARN_THRESHOLD) { SetMedianTimeOffsetWarning(std::nullopt); uiInterface.NotifyAlertChanged(); return false; } bilingual_str msg{strprintf(_( "Your computer's date and time appear to be more than %d minutes out of sync with the network, " "this may lead to consensus failure. After you've confirmed your computer's clock, this message " "should no longer appear when you restart your node. Without a restart, it should stop showing " "automatically after you've connected to a sufficient number of new outbound peers, which may " "take some time. You can inspect the `timeoffset` field of the `getpeerinfo` and `getnetworkinfo` " "RPC methods to get more info." ), Ticks(WARN_THRESHOLD))}; LogWarning("%s\n", msg.original); SetMedianTimeOffsetWarning(msg); uiInterface.NotifyAlertChanged(); return true; }