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// Copyright (c) 2022 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 <node/txreconciliation.h>
#include <util/check.h>
#include <util/system.h>
#include <unordered_map>
#include <variant>
namespace {
/**
* Keeps track of txreconciliation-related per-peer state.
*/
class TxReconciliationState
{
};
} // namespace
/** Actual implementation for TxReconciliationTracker's data structure. */
class TxReconciliationTracker::Impl
{
private:
mutable Mutex m_txreconciliation_mutex;
/**
* Keeps track of txreconciliation states of eligible peers.
* For pre-registered peers, the locally generated salt is stored.
* For registered peers, the locally generated salt is forgotten, and the state (including
* "full" salt) is stored instead.
*/
std::unordered_map<NodeId, std::variant<uint64_t, TxReconciliationState>> m_states GUARDED_BY(m_txreconciliation_mutex);
public:
explicit Impl() {}
uint64_t PreRegisterPeer(NodeId peer_id) EXCLUSIVE_LOCKS_REQUIRED(!m_txreconciliation_mutex)
{
AssertLockNotHeld(m_txreconciliation_mutex);
LOCK(m_txreconciliation_mutex);
// We do not support txreconciliation salt/version updates.
assert(m_states.find(peer_id) == m_states.end());
LogPrintLevel(BCLog::TXRECONCILIATION, BCLog::Level::Debug, "Pre-register peer=%d\n", peer_id);
const uint64_t local_salt{GetRand(UINT64_MAX)};
// We do this exactly once per peer (which are unique by NodeId, see GetNewNodeId) so it's
// safe to assume we don't have this record yet.
Assert(m_states.emplace(peer_id, local_salt).second);
return local_salt;
}
void ForgetPeer(NodeId peer_id) EXCLUSIVE_LOCKS_REQUIRED(!m_txreconciliation_mutex)
{
AssertLockNotHeld(m_txreconciliation_mutex);
LOCK(m_txreconciliation_mutex);
if (m_states.erase(peer_id)) {
LogPrintLevel(BCLog::TXRECONCILIATION, BCLog::Level::Debug, "Forget txreconciliation state of peer=%d\n", peer_id);
}
}
};
TxReconciliationTracker::TxReconciliationTracker() : m_impl{std::make_unique<TxReconciliationTracker::Impl>()} {}
TxReconciliationTracker::~TxReconciliationTracker() = default;
uint64_t TxReconciliationTracker::PreRegisterPeer(NodeId peer_id)
{
return m_impl->PreRegisterPeer(peer_id);
}
void TxReconciliationTracker::ForgetPeer(NodeId peer_id)
{
m_impl->ForgetPeer(peer_id);
}
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