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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.
#ifndef BITCOIN_NODE_TIMEOFFSETS_H
#define BITCOIN_NODE_TIMEOFFSETS_H
#include <sync.h>
#include <chrono>
#include <cstddef>
#include <deque>
namespace node {
class Warnings;
} // namespace node
class TimeOffsets
{
public:
TimeOffsets(node::Warnings& warnings) : m_warnings{warnings} {}
private:
//! Maximum number of timeoffsets stored.
static constexpr size_t MAX_SIZE{50};
//! Minimum difference between system and network time for a warning to be raised.
static constexpr std::chrono::minutes WARN_THRESHOLD{10};
mutable Mutex m_mutex;
/** The observed time differences between our local clock and those of our outbound peers. A
* positive offset means our peer's clock is ahead of our local clock. */
std::deque<std::chrono::seconds> m_offsets GUARDED_BY(m_mutex){};
node::Warnings& m_warnings;
public:
/** Add a new time offset sample. */
void Add(std::chrono::seconds offset) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
/** Compute and return the median of the collected time offset samples. The median is returned
* as 0 when there are less than 5 samples. */
std::chrono::seconds Median() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
/** Raise warnings if the median time offset exceeds the warnings threshold. Returns true if
* warnings were raised. */
bool WarnIfOutOfSync() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex);
};
#endif // BITCOIN_NODE_TIMEOFFSETS_H
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