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Merge bitcoin/bitcoin#32631: refactor: Convert GenTxid to std::variant

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a60f863d3e scripted-diff: Replace GenTxidVariant with GenTxid (marcofleon)
c8ba199598 Remove old GenTxid class (marcofleon)
072a198ea4 Convert remaining instances of GenTxid to GenTxidVariant (marcofleon)
1b528391c7 Convert `txrequest` to GenTxidVariant (marcofleon)
bde4579b07 Convert `txdownloadman_impl` to GenTxidVariant (marcofleon)
c876a892ec Replace GenTxid with Txid/Wtxid overloads in `txmempool` (marcofleon)
de858ce2be move-only: make GetInfo a private CTxMemPool member (stickies-v)
eee473d9f3 Convert `CompareInvMempoolOrder` to GenTxidVariant (marcofleon)
243553d590 refactor: replace get_iter_from_wtxid with GetIter(const Wtxid&) (stickies-v)
fcf92fd640 refactor: make CTxMemPool::GetIter strongly typed (marcofleon)
11d28f21bb Implement GenTxid as a variant (marcofleon)

Pull request description:

  Part of the [type safety refactor](https://github.com/bitcoin/bitcoin/pull/32189).

  This PR changes the GenTxid class to a variant, which holds both Txids and Wtxids. This provides compile-time type safety and eliminates the manual type check (bool m_is_wtxid). Variables that can be either a Txid or a Wtxid are now using the new GenTxid variant, instead of uint256.

ACKs for top commit:
  w0xlt:
    ACK a60f863d3e
  dergoegge:
    Code review ACK a60f863d3e
  maflcko:
    review ACK a60f863d3e 🎽
  theStack:
    Code-review ACK a60f863d3e

Tree-SHA512: da9b73b7bdffee2eb9281a409205519ac330d3336094d17681896703fbca8099608782c9c85801e388e4d90af5af8abf1f34931f57bbbe6e9674d802d6066047
This commit is contained in:
merge-script
2025-07-11 13:47:19 -04:00
parent 8ffbd7b778 a60f863d3e
commit 23e15d40b9
33 changed files with 312 additions and 315 deletions
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26
src/validation.cpp
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@@ -321,7 +321,7 @@ void Chainstate::MaybeUpdateMempoolForReorg(
// If the transaction doesn't make it in to the mempool, remove any
// transactions that depend on it (which would now be orphans).
m_mempool->removeRecursive(**it, MemPoolRemovalReason::REORG);
} else if (m_mempool->exists(GenTxid::Txid((*it)->GetHash()))) {
} else if (m_mempool->exists((*it)->GetHash())) {
vHashUpdate.push_back((*it)->GetHash());
}
++it;
@@ -372,7 +372,7 @@ void Chainstate::MaybeUpdateMempoolForReorg(
// If the transaction spends any coinbase outputs, it must be mature.
if (it->GetSpendsCoinbase()) {
for (const CTxIn& txin : tx.vin) {
if (m_mempool->exists(GenTxid::Txid(txin.prevout.hash))) continue;
if (m_mempool->exists(txin.prevout.hash)) continue;
const Coin& coin{CoinsTip().AccessCoin(txin.prevout)};
assert(!coin.IsSpent());
const auto mempool_spend_height{m_chain.Tip()->nHeight + 1};
@@ -807,10 +807,10 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
return state.Invalid(TxValidationResult::TX_PREMATURE_SPEND, "non-final");
}
if (m_pool.exists(GenTxid::Wtxid(tx.GetWitnessHash()))) {
if (m_pool.exists(tx.GetWitnessHash())) {
// Exact transaction already exists in the mempool.
return state.Invalid(TxValidationResult::TX_CONFLICT, "txn-already-in-mempool");
} else if (m_pool.exists(GenTxid::Txid(tx.GetHash()))) {
} else if (m_pool.exists(tx.GetHash())) {
// Transaction with the same non-witness data but different witness (same txid, different
// wtxid) already exists in the mempool.
return state.Invalid(TxValidationResult::TX_CONFLICT, "txn-same-nonwitness-data-in-mempool");
@@ -1135,8 +1135,7 @@ bool MemPoolAccept::PackageMempoolChecks(const std::vector<CTransactionRef>& txn
AssertLockHeld(m_pool.cs);
// CheckPackageLimits expects the package transactions to not already be in the mempool.
assert(std::all_of(txns.cbegin(), txns.cend(), [this](const auto& tx)
{ return !m_pool.exists(GenTxid::Txid(tx->GetHash()));}));
assert(std::all_of(txns.cbegin(), txns.cend(), [this](const auto& tx) { return !m_pool.exists(tx->GetHash()); }));
assert(txns.size() == workspaces.size());
@@ -1346,8 +1345,7 @@ bool MemPoolAccept::SubmitPackage(const ATMPArgs& args, std::vector<Workspace>&
AssertLockHeld(m_pool.cs);
// Sanity check: none of the transactions should be in the mempool, and none of the transactions
// should have a same-txid-different-witness equivalent in the mempool.
assert(std::all_of(workspaces.cbegin(), workspaces.cend(), [this](const auto& ws){
return !m_pool.exists(GenTxid::Txid(ws.m_ptx->GetHash())); }));
assert(std::all_of(workspaces.cbegin(), workspaces.cend(), [this](const auto& ws) { return !m_pool.exists(ws.m_ptx->GetHash()); }));
bool all_submitted = true;
FinalizeSubpackage(args);
@@ -1472,7 +1470,7 @@ MempoolAcceptResult MemPoolAccept::AcceptSingleTransaction(const CTransactionRef
// Limit the mempool, if appropriate.
if (!args.m_package_submission && !args.m_bypass_limits) {
LimitMempoolSize(m_pool, m_active_chainstate.CoinsTip());
if (!m_pool.exists(GenTxid::Txid(ws.m_hash))) {
if (!m_pool.exists(ws.m_hash)) {
// The tx no longer meets our (new) mempool minimum feerate but could be reconsidered in a package.
ws.m_state.Invalid(TxValidationResult::TX_RECONSIDERABLE, "mempool full");
return MempoolAcceptResult::FeeFailure(ws.m_state, CFeeRate(ws.m_modified_fees, ws.m_vsize), {ws.m_ptx->GetWitnessHash()});
@@ -1767,7 +1765,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptPackage(const Package& package,
// There are 3 possibilities: already in mempool, same-txid-diff-wtxid already in mempool,
// or not in mempool. An already confirmed tx is treated as one not in mempool, because all
// we know is that the inputs aren't available.
if (m_pool.exists(GenTxid::Wtxid(wtxid))) {
if (m_pool.exists(wtxid)) {
// Exact transaction already exists in the mempool.
// Node operators are free to set their mempool policies however they please, nodes may receive
// transactions in different orders, and malicious counterparties may try to take advantage of
@@ -1779,7 +1777,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptPackage(const Package& package,
// checking ancestor/descendant limits, or double-count transaction fees for fee-related policy.
const auto& entry{*Assert(m_pool.GetEntry(txid))};
results_final.emplace(wtxid, MempoolAcceptResult::MempoolTx(entry.GetTxSize(), entry.GetFee()));
} else if (m_pool.exists(GenTxid::Txid(txid))) {
} else if (m_pool.exists(txid)) {
// Transaction with the same non-witness data but different witness (same txid,
// different wtxid) already exists in the mempool.
//
@@ -1798,7 +1796,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptPackage(const Package& package,
if (single_res.m_result_type == MempoolAcceptResult::ResultType::VALID) {
// The transaction succeeded on its own and is now in the mempool. Don't include it
// in package validation, because its fees should only be "used" once.
assert(m_pool.exists(GenTxid::Wtxid(wtxid)));
assert(m_pool.exists(wtxid));
results_final.emplace(wtxid, single_res);
} else if (package.size() == 1 || // If there is only one transaction, no need to retry it "as a package"
(single_res.m_state.GetResult() != TxValidationResult::TX_RECONSIDERABLE &&
@@ -1843,7 +1841,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptPackage(const Package& package,
// If it was submitted, check to see if the tx is still in the mempool. It could have
// been evicted due to LimitMempoolSize() above.
const auto& txresult = multi_submission_result.m_tx_results.at(wtxid);
if (txresult.m_result_type == MempoolAcceptResult::ResultType::VALID && !m_pool.exists(GenTxid::Wtxid(wtxid))) {
if (txresult.m_result_type == MempoolAcceptResult::ResultType::VALID && !m_pool.exists(wtxid)) {
package_state_final.Invalid(PackageValidationResult::PCKG_TX, "transaction failed");
TxValidationState mempool_full_state;
mempool_full_state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "mempool full");
@@ -1857,7 +1855,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptPackage(const Package& package,
Assume(it->second.m_result_type != MempoolAcceptResult::ResultType::INVALID);
Assume(individual_results_nonfinal.count(wtxid) == 0);
// Query by txid to include the same-txid-different-witness ones.
if (!m_pool.exists(GenTxid::Txid(tx->GetHash()))) {
if (!m_pool.exists(tx->GetHash())) {
package_state_final.Invalid(PackageValidationResult::PCKG_TX, "transaction failed");
TxValidationState mempool_full_state;
mempool_full_state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "mempool full");