Function IsRBFOptIn

src/policy/rbf.cpp:24–50

#include <compare>

RBFTransactionState IsRBFOptIn(const CTransaction& tx, const CTxMemPool& pool)
{
    AssertLockHeld(pool.cs);

    // First check the transaction itself.
    if (SignalsOptInRBF(tx)) {
        return RBFTransactionState::REPLACEABLE_BIP125;
    }

    // If this transaction is not in our mempool, then we can't be sure
    // we will know about all its inputs.
    if (!pool.exists(tx.GetHash())) {
        return RBFTransactionState::UNKNOWN;
    }

    // If all the inputs have nSequence >= maxint-1, it still might be
    // signaled for RBF if any unconfirmed parents have signaled.
    const auto& entry{*Assert(pool.GetEntry(tx.GetHash()))};
    auto ancestors{pool.CalculateMemPoolAncestors(entry)};

    for (CTxMemPool::txiter it : ancestors) {
        if (SignalsOptInRBF(it->GetTx())) {
            return RBFTransactionState::REPLACEABLE_BIP125;
        }
    }
    return RBFTransactionState::FINAL;
}

RBFTransactionState IsRBFOptInEmptyMempool(const CTransaction& tx)
{