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// 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 <logging.h>
#include <node/timeoffsets.h>
#include <node/warnings.h>
#include <sync.h>
#include <tinyformat.h>
#include <util/time.h>
#include <util/translation.h>
#include <algorithm>
#include <chrono>
#include <cstdint>
#include <deque>
#include <limits>
#include <optional>
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<std::chrono::seconds>(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<int64_t>::min(), calling std::chrono::abs is UB
auto median{std::max(Median(), std::chrono::seconds(std::numeric_limits<int64_t>::min() + 1))};
if (std::chrono::abs(median) <= WARN_THRESHOLD) {
m_warnings.Unset(node::Warning::CLOCK_OUT_OF_SYNC);
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<std::chrono::minutes>(WARN_THRESHOLD))};
LogWarning("%s\n", msg.original);
m_warnings.Set(node::Warning::CLOCK_OUT_OF_SYNC, msg);
return true;
}
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