truc_policy.h

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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.

#ifndef BITCOIN_POLICY_TRUC_POLICY_H
#define BITCOIN_POLICY_TRUC_POLICY_H

#include <consensus/amount.h>
#include <policy/packages.h>
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <txmempool.h>
#include <util/result.h>

#include <set>
#include <string>

// This module enforces rules for BIP 431 TRUC transactions which help make
// RBF abilities more robust. A transaction with version=3 is treated as TRUC.
static constexpr decltype(CTransaction::version) TRUC_VERSION{3};

// TRUC only allows 1 parent and 1 child when unconfirmed. This translates to a descendant set size
// of 2 and ancestor set size of 2.
static constexpr unsigned int TRUC_DESCENDANT_LIMIT{2};
static constexpr unsigned int TRUC_ANCESTOR_LIMIT{2};

static constexpr int64_t TRUC_MAX_VSIZE{10000};
static constexpr int64_t TRUC_CHILD_MAX_VSIZE{1000};
// These limits are within the default ancestor/descendant limits.
static_assert(TRUC_MAX_VSIZE + TRUC_CHILD_MAX_VSIZE <= DEFAULT_ANCESTOR_SIZE_LIMIT_KVB * 1000);
static_assert(TRUC_MAX_VSIZE + TRUC_CHILD_MAX_VSIZE <= DEFAULT_DESCENDANT_SIZE_LIMIT_KVB * 1000);

std::optional<std::pair<std::string, CTransactionRef>> SingleTRUCChecks(const CTransactionRef& ptx,
                                          const CTxMemPool::setEntries& mempool_ancestors,
                                          const std::set<Txid>& direct_conflicts,
                                          int64_t vsize);

std::optional<std::string> PackageTRUCChecks(const CTransactionRef& ptx, int64_t vsize,
                                           const Package& package,
                                           const CTxMemPool::setEntries& mempool_ancestors);

#endif // BITCOIN_POLICY_TRUC_POLICY_H