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[policy] sibling eviction for v3 transactions

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This commit is contained in:
glozow
2024-02-14 14:15:48 +00:00
parent b5d15f764f
commit 170306728a
5 changed files with 76 additions and 27 deletions
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49
src/validation.cpp
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@@ -585,12 +585,14 @@ private:
// of checking a given transaction.
struct Workspace {
explicit Workspace(const CTransactionRef& ptx) : m_ptx(ptx), m_hash(ptx->GetHash()) {}
/** Txids of mempool transactions that this transaction directly conflicts with. */
/** Txids of mempool transactions that this transaction directly conflicts with or may
* replace via sibling eviction. */
std::set<Txid> m_conflicts;
/** Iterators to mempool entries that this transaction directly conflicts with. */
/** Iterators to mempool entries that this transaction directly conflicts with or may
* replace via sibling eviction. */
CTxMemPool::setEntries m_iters_conflicting;
/** Iterators to all mempool entries that would be replaced by this transaction, including
* those it directly conflicts with and their descendants. */
* m_conflicts and their descendants. */
CTxMemPool::setEntries m_all_conflicting;
/** All mempool ancestors of this transaction. */
CTxMemPool::setEntries m_ancestors;
@@ -598,9 +600,12 @@ private:
* inserted into the mempool until Finalize(). */
std::unique_ptr<CTxMemPoolEntry> m_entry;
/** Pointers to the transactions that have been removed from the mempool and replaced by
* this transaction, used to return to the MemPoolAccept caller. Only populated if
* this transaction (everything in m_all_conflicting), used to return to the MemPoolAccept caller. Only populated if
* validation is successful and the original transactions are removed. */
std::list<CTransactionRef> m_replaced_transactions;
/** Whether RBF-related data structures (m_conflicts, m_iters_conflicting, m_all_conflicting,
* m_replaced_transactions) include a sibling in addition to txns with conflicting inputs. */
bool m_sibling_eviction{false};
/** Virtual size of the transaction as used by the mempool, calculated using serialized size
* of the transaction and sigops. */
@@ -690,7 +695,8 @@ private:
Chainstate& m_active_chainstate;
/** Whether the transaction(s) would replace any mempool transactions. If so, RBF rules apply. */
/** Whether the transaction(s) would replace any mempool transactions and/or evict any siblings.
* If so, RBF rules apply. */
bool m_rbf{false};
};
@@ -954,8 +960,27 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
}
ws.m_ancestors = *ancestors;
// Even though just checking direct mempool parents for inheritance would be sufficient, we
// check using the full ancestor set here because it's more convenient to use what we have
// already calculated.
if (const auto err{SingleV3Checks(ws.m_ptx, ws.m_ancestors, ws.m_conflicts, ws.m_vsize)}) {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "v3-rule-violation", err->first);
// Disabled within package validation.
if (err->second != nullptr && args.m_allow_replacement) {
// Potential sibling eviction. Add the sibling to our list of mempool conflicts to be
// included in RBF checks.
ws.m_conflicts.insert(err->second->GetHash());
// Adding the sibling to m_iters_conflicting here means that it doesn't count towards
// RBF Carve Out above. This is correct, since removing to-be-replaced transactions from
// the descendant count is done separately in SingleV3Checks for v3 transactions.
ws.m_iters_conflicting.insert(m_pool.GetIter(err->second->GetHash()).value());
ws.m_sibling_eviction = true;
// The sibling will be treated as part of the to-be-replaced set in ReplacementChecks.
// Note that we are not checking whether it opts in to replaceability via BIP125 or v3
// (which is normally done in PreChecks). However, the only way a v3 transaction can
// have a non-v3 and non-BIP125 descendant is due to a reorg.
} else {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "v3-rule-violation", err->first);
}
}
// A transaction that spends outputs that would be replaced by it is invalid. Now
@@ -995,18 +1020,21 @@ bool MemPoolAccept::ReplacementChecks(Workspace& ws)
// Even though this is a fee-related failure, this result is TX_MEMPOOL_POLICY, not
// TX_RECONSIDERABLE, because it cannot be bypassed using package validation.
// This must be changed if package RBF is enabled.
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "insufficient fee", *err_string);
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
strprintf("insufficient fee%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string);
}
// Calculate all conflicting entries and enforce Rule #5.
if (const auto err_string{GetEntriesForConflicts(tx, m_pool, ws.m_iters_conflicting, ws.m_all_conflicting)}) {
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"too many potential replacements", *err_string);
strprintf("too many potential replacements%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string);
}
// Enforce Rule #2.
if (const auto err_string{HasNoNewUnconfirmed(tx, m_pool, ws.m_iters_conflicting)}) {
// Sibling eviction is only done for v3 transactions, which cannot have multiple ancestors.
Assume(!ws.m_sibling_eviction);
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
"replacement-adds-unconfirmed", *err_string);
strprintf("replacement-adds-unconfirmed%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string);
}
// Check if it's economically rational to mine this transaction rather than the ones it
// replaces and pays for its own relay fees. Enforce Rules #3 and #4.
@@ -1019,7 +1047,8 @@ bool MemPoolAccept::ReplacementChecks(Workspace& ws)
// Even though this is a fee-related failure, this result is TX_MEMPOOL_POLICY, not
// TX_RECONSIDERABLE, because it cannot be bypassed using package validation.
// This must be changed if package RBF is enabled.
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, "insufficient fee", *err_string);
return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY,
strprintf("insufficient fee%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string);
}
return true;
}