v3_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_V3_POLICY_H
#define BITCOIN_POLICY_V3_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 transactions with nVersion=3 ("v3 transactions") which help make
// RBF abilities more robust.
 
// v3 only allows 1 parent and 1 child when unconfirmed.
static constexpr unsigned int V3_DESCENDANT_LIMIT{2};
static constexpr unsigned int V3_ANCESTOR_LIMIT{2};
 
static constexpr int64_t V3_CHILD_MAX_VSIZE{1000};
// These limits are within the default ancestor/descendant limits.
static_assert(V3_CHILD_MAX_VSIZE + MAX_STANDARD_TX_WEIGHT / WITNESS_SCALE_FACTOR <= DEFAULT_ANCESTOR_SIZE_LIMIT_KVB * 1000);
static_assert(V3_CHILD_MAX_VSIZE + MAX_STANDARD_TX_WEIGHT / WITNESS_SCALE_FACTOR <= DEFAULT_DESCENDANT_SIZE_LIMIT_KVB * 1000);
 
std::optional<std::pair<std::string, CTransactionRef>> SingleV3Checks(const CTransactionRef& ptx,
                                          const CTxMemPool::setEntries& mempool_ancestors,
                                          const std::set<Txid>& direct_conflicts,
                                          int64_t vsize);
 
std::optional<std::string> PackageV3Checks(const CTransactionRef& ptx, int64_t vsize,
                                           const Package& package,
                                           const CTxMemPool::setEntries& mempool_ancestors);
 
#endif // BITCOIN_POLICY_V3_POLICY_H