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[refactor] Rewrite AcceptToMemoryPoolWorker() using smaller parts

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This is in preparation for re-using these validation components for a new
version of AcceptToMemoryPool() that can operate on multiple transactions
("package relay").
pull/764/head
Suhas Daftuar 5 years ago
parent cd737214ce
commit 4a87c5cfdf
1 changed files with 499 additions and 346 deletions
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327
src/validation.cpp
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@ -428,21 +428,134 @@ static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, CValidationSt
return CheckInputs(tx, state, view, flags, cacheSigStore, true, txdata);
}
/**
* @param[out] coins_to_uncache Return any outpoints which were not previously present in the
* coins cache, but were added as a result of validating the tx
* for mempool acceptance. This allows the caller to optionally
* remove the cache additions if the associated transaction ends
* up being rejected by the mempool.
namespace {
class MemPoolAccept
{
public:
MemPoolAccept(CTxMemPool& mempool) : m_pool(mempool), m_view(&m_dummy), m_viewmempool(&::ChainstateActive().CoinsTip(), m_pool),
m_limit_ancestors(gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT)),
m_limit_ancestor_size(gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000),
m_limit_descendants(gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT)),
m_limit_descendant_size(gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000) {}
// We put the arguments we're handed into a struct, so we can pass them
// around easier.
struct ATMPArgs {
const CChainParams& m_chainparams;
CValidationState &m_state;
bool* m_missing_inputs;
const int64_t m_accept_time;
std::list<CTransactionRef>* m_replaced_transactions;
const bool m_bypass_limits;
const CAmount& m_absurd_fee;
/*
* Return any outpoints which were not previously present in the coins
* cache, but were added as a result of validating the tx for mempool
* acceptance. This allows the caller to optionally remove the cache
* additions if the associated transaction ends up being rejected by
* the mempool.
*/
static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool& pool, CValidationState& state, const CTransactionRef& ptx,
bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
bool bypass_limits, const CAmount& nAbsurdFee, std::vector<COutPoint>& coins_to_uncache, bool test_accept) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
std::vector<COutPoint>& m_coins_to_uncache;
const bool m_test_accept;
};
// Single transaction acceptance
bool AcceptSingleTransaction(const CTransactionRef& ptx, ATMPArgs& args) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
private:
// All the intermediate state that gets passed between the various levels
// of checking a given transaction.
struct Workspace {
Workspace(const CTransactionRef& ptx) : m_ptx(ptx), m_hash(ptx->GetHash()) {}
std::set<uint256> m_conflicts;
CTxMemPool::setEntries m_all_conflicting;
CTxMemPool::setEntries m_ancestors;
std::unique_ptr<CTxMemPoolEntry> m_entry;
bool m_replacement_transaction;
CAmount m_modified_fees;
CAmount m_conflicting_fees;
size_t m_conflicting_size;
const CTransactionRef& m_ptx;
const uint256& m_hash;
};
// Run the policy checks on a given transaction, excluding any script checks.
// Looks up inputs, calculates feerate, considers replacement, evaluates
// package limits, etc. As this function can be invoked for "free" by a peer,
// only tests that are fast should be done here (to avoid CPU DoS).
bool PreChecks(ATMPArgs& args, Workspace& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
// Run the script checks using our policy flags. As this can be slow, we should
// only invoke this on transactions that have otherwise passed policy checks.
bool PolicyScriptChecks(ATMPArgs& args, Workspace& ws, PrecomputedTransactionData& txdata) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
// Re-run the script checks, using consensus flags, and try to cache the
// result in the scriptcache. This should be done after
// PolicyScriptChecks(). This requires that all inputs either be in our
// utxo set or in the mempool.
bool ConsensusScriptChecks(ATMPArgs& args, Workspace& ws, PrecomputedTransactionData &txdata) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
// Try to add the transaction to the mempool, removing any conflicts first.
// Returns true if the transaction is in the mempool after any size
// limiting is performed, false otherwise.
bool Finalize(ATMPArgs& args, Workspace& ws) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs);
// Compare a package's feerate against minimum allowed.
bool CheckFeeRate(size_t package_size, CAmount package_fee, CValidationState& state)
{
CAmount mempoolRejectFee = m_pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(package_size);
if (mempoolRejectFee > 0 && package_fee < mempoolRejectFee) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", strprintf("%d < %d", package_fee, mempoolRejectFee));
}
if (package_fee < ::minRelayTxFee.GetFee(package_size)) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_INSUFFICIENTFEE, "min relay fee not met", strprintf("%d < %d", package_fee, ::minRelayTxFee.GetFee(package_size)));
}
return true;
}
private:
CTxMemPool& m_pool;
CCoinsViewCache m_view;
CCoinsViewMemPool m_viewmempool;
CCoinsView m_dummy;
// The package limits in effect at the time of invocation.
const size_t m_limit_ancestors;
const size_t m_limit_ancestor_size;
// These may be modified while evaluating a transaction (eg to account for
// in-mempool conflicts; see below).
size_t m_limit_descendants;
size_t m_limit_descendant_size;
};
bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
{
const CTransaction& tx = *ptx;
const uint256 hash = tx.GetHash();
AssertLockHeld(cs_main);
LOCK(pool.cs); // mempool "read lock" (held through GetMainSignals().TransactionAddedToMempool())
const CTransactionRef& ptx = ws.m_ptx;
const CTransaction& tx = *ws.m_ptx;
const uint256& hash = ws.m_hash;
// Copy/alias what we need out of args
CValidationState &state = args.m_state;
bool* pfMissingInputs = args.m_missing_inputs;
const int64_t nAcceptTime = args.m_accept_time;
const bool bypass_limits = args.m_bypass_limits;
const CAmount& nAbsurdFee = args.m_absurd_fee;
std::vector<COutPoint>& coins_to_uncache = args.m_coins_to_uncache;
// Alias what we need out of ws
std::set<uint256>& setConflicts = ws.m_conflicts;
CTxMemPool::setEntries& allConflicting = ws.m_all_conflicting;
CTxMemPool::setEntries& setAncestors = ws.m_ancestors;
std::unique_ptr<CTxMemPoolEntry>& entry = ws.m_entry;
bool& fReplacementTransaction = ws.m_replacement_transaction;
CAmount& nModifiedFees = ws.m_modified_fees;
CAmount& nConflictingFees = ws.m_conflicting_fees;
size_t& nConflictingSize = ws.m_conflicting_size;
if (pfMissingInputs) {
*pfMissingInputs = false;
}
@ -472,15 +585,14 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
return state.Invalid(ValidationInvalidReason::TX_PREMATURE_SPEND, false, REJECT_NONSTANDARD, "non-final");
// is it already in the memory pool?
if (pool.exists(hash)) {
if (m_pool.exists(hash)) {
return state.Invalid(ValidationInvalidReason::TX_CONFLICT, false, REJECT_DUPLICATE, "txn-already-in-mempool");
}
// Check for conflicts with in-memory transactions
std::set<uint256> setConflicts;
for (const CTxIn &txin : tx.vin)
{
const CTransaction* ptxConflicting = pool.GetConflictTx(txin.prevout);
const CTransaction* ptxConflicting = m_pool.GetConflictTx(txin.prevout);
if (ptxConflicting) {
if (!setConflicts.count(ptxConflicting->GetHash()))
{
@ -514,15 +626,10 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
}
}
{
CCoinsView dummy;
CCoinsViewCache view(&dummy);
LockPoints lp;
CCoinsViewCache& coins_cache = ::ChainstateActive().CoinsTip();
CCoinsViewMemPool viewMemPool(&coins_cache, pool);
view.SetBackend(viewMemPool);
m_view.SetBackend(m_viewmempool);
CCoinsViewCache& coins_cache = ::ChainstateActive().CoinsTip();
// do all inputs exist?
for (const CTxIn& txin : tx.vin) {
if (!coins_cache.HaveCoinInCache(txin.prevout)) {
@ -530,9 +637,9 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
}
// Note: this call may add txin.prevout to the coins cache
// (CoinsTip().cacheCoins) by way of FetchCoin(). It should be removed
// (coins_cache.cacheCoins) by way of FetchCoin(). It should be removed
// later (via coins_to_uncache) if this tx turns out to be invalid.
if (!view.HaveCoin(txin.prevout)) {
if (!m_view.HaveCoin(txin.prevout)) {
// Are inputs missing because we already have the tx?
for (size_t out = 0; out < tx.vout.size(); out++) {
// Optimistically just do efficient check of cache for outputs
@ -549,80 +656,70 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
}
// Bring the best block into scope
view.GetBestBlock();
m_view.GetBestBlock();
// we have all inputs cached now, so switch back to dummy, so we don't need to keep lock on mempool
view.SetBackend(dummy);
// we have all inputs cached now, so switch back to dummy (to protect
// against bugs where we pull more inputs from disk that miss being added
// to coins_to_uncache)
m_view.SetBackend(m_dummy);
// Only accept BIP68 sequence locked transactions that can be mined in the next
// block; we don't want our mempool filled up with transactions that can't
// be mined yet.
// Must keep pool.cs for this unless we change CheckSequenceLocks to take a
// CoinsViewCache instead of create its own
if (!CheckSequenceLocks(pool, tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp))
if (!CheckSequenceLocks(m_pool, tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp))
return state.Invalid(ValidationInvalidReason::TX_PREMATURE_SPEND, false, REJECT_NONSTANDARD, "non-BIP68-final");
CAmount nFees = 0;
if (!Consensus::CheckTxInputs(tx, state, view, GetSpendHeight(view), nFees)) {
if (!Consensus::CheckTxInputs(tx, state, m_view, GetSpendHeight(m_view), nFees)) {
return error("%s: Consensus::CheckTxInputs: %s, %s", __func__, tx.GetHash().ToString(), FormatStateMessage(state));
}
// Check for non-standard pay-to-script-hash in inputs
if (fRequireStandard && !AreInputsStandard(tx, view))
if (fRequireStandard && !AreInputsStandard(tx, m_view))
return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD, false, REJECT_NONSTANDARD, "bad-txns-nonstandard-inputs");
// Check for non-standard witness in P2WSH
if (tx.HasWitness() && fRequireStandard && !IsWitnessStandard(tx, view))
if (tx.HasWitness() && fRequireStandard && !IsWitnessStandard(tx, m_view))
return state.Invalid(ValidationInvalidReason::TX_WITNESS_MUTATED, false, REJECT_NONSTANDARD, "bad-witness-nonstandard");
int64_t nSigOpsCost = GetTransactionSigOpCost(tx, view, STANDARD_SCRIPT_VERIFY_FLAGS);
int64_t nSigOpsCost = GetTransactionSigOpCost(tx, m_view, STANDARD_SCRIPT_VERIFY_FLAGS);
// nModifiedFees includes any fee deltas from PrioritiseTransaction
CAmount nModifiedFees = nFees;
pool.ApplyDelta(hash, nModifiedFees);
nModifiedFees = nFees;
m_pool.ApplyDelta(hash, nModifiedFees);
// Keep track of transactions that spend a coinbase, which we re-scan
// during reorgs to ensure COINBASE_MATURITY is still met.
bool fSpendsCoinbase = false;
for (const CTxIn &txin : tx.vin) {
const Coin &coin = view.AccessCoin(txin.prevout);
const Coin &coin = m_view.AccessCoin(txin.prevout);
if (coin.IsCoinBase()) {
fSpendsCoinbase = true;
break;
}
}
CTxMemPoolEntry entry(ptx, nFees, nAcceptTime, ::ChainActive().Height(),
fSpendsCoinbase, nSigOpsCost, lp);
unsigned int nSize = entry.GetTxSize();
entry.reset(new CTxMemPoolEntry(ptx, nFees, nAcceptTime, ::ChainActive().Height(),
fSpendsCoinbase, nSigOpsCost, lp));
unsigned int nSize = entry->GetTxSize();
if (nSigOpsCost > MAX_STANDARD_TX_SIGOPS_COST)
return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD, false, REJECT_NONSTANDARD, "bad-txns-too-many-sigops",
strprintf("%d", nSigOpsCost));
CAmount mempoolRejectFee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nSize);
if (!bypass_limits && mempoolRejectFee > 0 && nModifiedFees < mempoolRejectFee) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_INSUFFICIENTFEE, "mempool min fee not met", strprintf("%d < %d", nModifiedFees, mempoolRejectFee));
}
// No transactions are allowed below minRelayTxFee except from disconnected blocks
if (!bypass_limits && nModifiedFees < ::minRelayTxFee.GetFee(nSize)) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_INSUFFICIENTFEE, "min relay fee not met", strprintf("%d < %d", nModifiedFees, ::minRelayTxFee.GetFee(nSize)));
}
// No transactions are allowed below minRelayTxFee except from disconnected
// blocks
if (!bypass_limits && !CheckFeeRate(nSize, nModifiedFees, state)) return false;
if (nAbsurdFee && nFees > nAbsurdFee)
return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD, false,
REJECT_HIGHFEE, "absurdly-high-fee",
strprintf("%d > %d", nFees, nAbsurdFee));
const CTxMemPool::setEntries setIterConflicting = pool.GetIterSet(setConflicts);
const CTxMemPool::setEntries setIterConflicting = m_pool.GetIterSet(setConflicts);
// Calculate in-mempool ancestors, up to a limit.
CTxMemPool::setEntries setAncestors;
size_t nLimitAncestors = gArgs.GetArg("-limitancestorcount", DEFAULT_ANCESTOR_LIMIT);
size_t nLimitAncestorSize = gArgs.GetArg("-limitancestorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000;
size_t nLimitDescendants = gArgs.GetArg("-limitdescendantcount", DEFAULT_DESCENDANT_LIMIT);
size_t nLimitDescendantSize = gArgs.GetArg("-limitdescendantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000;
if (setConflicts.size() == 1) {
// In general, when we receive an RBF transaction with mempool conflicts, we want to know whether we
// would meet the chain limits after the conflicts have been removed. However, there isn't a practical
@ -649,17 +746,17 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// CalculateMempoolAncestors by assuming the new transaction being added is a new descendant, with no
// removals, of each parent's existing dependant set). The ancestor count limits are unmodified (as
// the ancestor limits should be the same for both our new transaction and any conflicts).
// We don't bother incrementing nLimitDescendants by the full removal count as that limit never comes
// We don't bother incrementing m_limit_descendants by the full removal count as that limit never comes
// into force here (as we're only adding a single transaction).
assert(setIterConflicting.size() == 1);
CTxMemPool::txiter conflict = *setIterConflicting.begin();
nLimitDescendants += 1;
nLimitDescendantSize += conflict->GetSizeWithDescendants();
m_limit_descendants += 1;
m_limit_descendant_size += conflict->GetSizeWithDescendants();
}
std::string errString;
if (!pool.CalculateMemPoolAncestors(entry, setAncestors, nLimitAncestors, nLimitAncestorSize, nLimitDescendants, nLimitDescendantSize, errString)) {
if (!m_pool.CalculateMemPoolAncestors(*entry, setAncestors, m_limit_ancestors, m_limit_ancestor_size, m_limit_descendants, m_limit_descendant_size, errString)) {
setAncestors.clear();
// If CalculateMemPoolAncestors fails second time, we want the original error string.
std::string dummy_err_string;
@ -675,7 +772,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// outputs - one for each counterparty. For more info on the uses for
// this, see https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-November/016518.html
if (nSize > EXTRA_DESCENDANT_TX_SIZE_LIMIT ||
!pool.CalculateMemPoolAncestors(entry, setAncestors, 2, nLimitAncestorSize, nLimitDescendants + 1, nLimitDescendantSize + EXTRA_DESCENDANT_TX_SIZE_LIMIT, dummy_err_string)) {
!m_pool.CalculateMemPoolAncestors(*entry, setAncestors, 2, m_limit_ancestor_size, m_limit_descendants + 1, m_limit_descendant_size + EXTRA_DESCENDANT_TX_SIZE_LIMIT, dummy_err_string)) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_NONSTANDARD, "too-long-mempool-chain", errString);
}
}
@ -698,15 +795,14 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// Check if it's economically rational to mine this transaction rather
// than the ones it replaces.
CAmount nConflictingFees = 0;
size_t nConflictingSize = 0;
nConflictingFees = 0;
nConflictingSize = 0;
uint64_t nConflictingCount = 0;
CTxMemPool::setEntries allConflicting;
// If we don't hold the lock allConflicting might be incomplete; the
// subsequent RemoveStaged() and addUnchecked() calls don't guarantee
// mempool consistency for us.
const bool fReplacementTransaction = setConflicts.size();
fReplacementTransaction = setConflicts.size();
if (fReplacementTransaction)
{
CFeeRate newFeeRate(nModifiedFees, nSize);
@ -751,7 +847,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// If not too many to replace, then calculate the set of
// transactions that would have to be evicted
for (CTxMemPool::txiter it : setIterConflicting) {
pool.CalculateDescendants(it, allConflicting);
m_pool.CalculateDescendants(it, allConflicting);
}
for (CTxMemPool::txiter it : allConflicting) {
nConflictingFees += it->GetModifiedFee();
@ -781,7 +877,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// Rather than check the UTXO set - potentially expensive -
// it's cheaper to just check if the new input refers to a
// tx that's in the mempool.
if (pool.exists(tx.vin[j].prevout.hash)) {
if (m_pool.exists(tx.vin[j].prevout.hash)) {
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_NONSTANDARD, "replacement-adds-unconfirmed",
strprintf("replacement %s adds unconfirmed input, idx %d",
hash.ToString(), j));
@ -811,21 +907,26 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
FormatMoney(::incrementalRelayFee.GetFee(nSize))));
}
}
return true;
}
bool MemPoolAccept::PolicyScriptChecks(ATMPArgs& args, Workspace& ws, PrecomputedTransactionData& txdata)
{
const CTransaction& tx = *ws.m_ptx;
CValidationState &state = args.m_state;
constexpr unsigned int scriptVerifyFlags = STANDARD_SCRIPT_VERIFY_FLAGS;
// Check against previous transactions
// The first loop above does all the inexpensive checks.
// Only if ALL inputs pass do we perform expensive ECDSA signature checks.
// Helps prevent CPU exhaustion denial-of-service attacks.
PrecomputedTransactionData txdata(tx);
if (!CheckInputs(tx, state, view, scriptVerifyFlags, true, false, txdata)) {
// This is done last to help prevent CPU exhaustion denial-of-service attacks.
if (!CheckInputs(tx, state, m_view, scriptVerifyFlags, true, false, txdata)) {
// SCRIPT_VERIFY_CLEANSTACK requires SCRIPT_VERIFY_WITNESS, so we
// need to turn both off, and compare against just turning off CLEANSTACK
// to see if the failure is specifically due to witness validation.
CValidationState stateDummy; // Want reported failures to be from first CheckInputs
if (!tx.HasWitness() && CheckInputs(tx, stateDummy, view, scriptVerifyFlags & ~(SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_CLEANSTACK), true, false, txdata) &&
!CheckInputs(tx, stateDummy, view, scriptVerifyFlags & ~SCRIPT_VERIFY_CLEANSTACK, true, false, txdata)) {
if (!tx.HasWitness() && CheckInputs(tx, stateDummy, m_view, scriptVerifyFlags & ~(SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_CLEANSTACK), true, false, txdata) &&
!CheckInputs(tx, stateDummy, m_view, scriptVerifyFlags & ~SCRIPT_VERIFY_CLEANSTACK, true, false, txdata)) {
// Only the witness is missing, so the transaction itself may be fine.
state.Invalid(ValidationInvalidReason::TX_WITNESS_MUTATED, false,
state.GetRejectCode(), state.GetRejectReason(), state.GetDebugMessage());
@ -834,6 +935,17 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
return false; // state filled in by CheckInputs
}
return true;
}
bool MemPoolAccept::ConsensusScriptChecks(ATMPArgs& args, Workspace& ws, PrecomputedTransactionData& txdata)
{
const CTransaction& tx = *ws.m_ptx;
const uint256& hash = ws.m_hash;
CValidationState &state = args.m_state;
const CChainParams& chainparams = args.m_chainparams;
// Check again against the current block tip's script verification
// flags to cache our script execution flags. This is, of course,
// useless if the next block has different script flags from the
@ -850,15 +962,28 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
// invalid blocks (using TestBlockValidity), however allowing such
// transactions into the mempool can be exploited as a DoS attack.
unsigned int currentBlockScriptVerifyFlags = GetBlockScriptFlags(::ChainActive().Tip(), chainparams.GetConsensus());
if (!CheckInputsFromMempoolAndCache(tx, state, view, pool, currentBlockScriptVerifyFlags, true, txdata)) {
if (!CheckInputsFromMempoolAndCache(tx, state, m_view, m_pool, currentBlockScriptVerifyFlags, true, txdata)) {
return error("%s: BUG! PLEASE REPORT THIS! CheckInputs failed against latest-block but not STANDARD flags %s, %s",
__func__, hash.ToString(), FormatStateMessage(state));
}
if (test_accept) {
// Tx was accepted, but not added
return true;
}
}
bool MemPoolAccept::Finalize(ATMPArgs& args, Workspace& ws)
{
const CTransaction& tx = *ws.m_ptx;
const uint256& hash = ws.m_hash;
CValidationState &state = args.m_state;
const bool bypass_limits = args.m_bypass_limits;
CTxMemPool::setEntries& allConflicting = ws.m_all_conflicting;
CTxMemPool::setEntries& setAncestors = ws.m_ancestors;
const CAmount& nModifiedFees = ws.m_modified_fees;
const CAmount& nConflictingFees = ws.m_conflicting_fees;
const size_t& nConflictingSize = ws.m_conflicting_size;
const bool fReplacementTransaction = ws.m_replacement_transaction;
std::unique_ptr<CTxMemPoolEntry>& entry = ws.m_entry;
// Remove conflicting transactions from the mempool
for (CTxMemPool::txiter it : allConflicting)
@ -867,42 +992,70 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
it->GetTx().GetHash().ToString(),
hash.ToString(),
FormatMoney(nModifiedFees - nConflictingFees),
(int)nSize - (int)nConflictingSize);
if (plTxnReplaced)
plTxnReplaced->push_back(it->GetSharedTx());
(int)entry->GetTxSize() - (int)nConflictingSize);
if (args.m_replaced_transactions)
args.m_replaced_transactions->push_back(it->GetSharedTx());
}
pool.RemoveStaged(allConflicting, false, MemPoolRemovalReason::REPLACED);
m_pool.RemoveStaged(allConflicting, false, MemPoolRemovalReason::REPLACED);
// This transaction should only count for fee estimation if:
// - it isn't a BIP 125 replacement transaction (may not be widely supported)
// - it's not being re-added during a reorg which bypasses typical mempool fee limits
// - the node is not behind
// - the transaction is not dependent on any other transactions in the mempool
bool validForFeeEstimation = !fReplacementTransaction && !bypass_limits && IsCurrentForFeeEstimation() && pool.HasNoInputsOf(tx);
bool validForFeeEstimation = !fReplacementTransaction && !bypass_limits && IsCurrentForFeeEstimation() && m_pool.HasNoInputsOf(tx);
// Store transaction in memory
pool.addUnchecked(entry, setAncestors, validForFeeEstimation);
m_pool.addUnchecked(*entry, setAncestors, validForFeeEstimation);
// trim mempool and check if tx was trimmed
if (!bypass_limits) {
LimitMempoolSize(pool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
if (!pool.exists(hash))
LimitMempoolSize(m_pool, gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000, gArgs.GetArg("-mempoolexpiry", DEFAULT_MEMPOOL_EXPIRY) * 60 * 60);
if (!m_pool.exists(hash))
return state.Invalid(ValidationInvalidReason::TX_MEMPOOL_POLICY, false, REJECT_INSUFFICIENTFEE, "mempool full");
}
}
return true;
}
bool MemPoolAccept::AcceptSingleTransaction(const CTransactionRef& ptx, ATMPArgs& args)
{
AssertLockHeld(cs_main);
LOCK(m_pool.cs); // mempool "read lock" (held through GetMainSignals().TransactionAddedToMempool())
Workspace workspace(ptx);
if (!PreChecks(args, workspace)) return false;
// Only compute the precomputed transaction data if we need to verify
// scripts (ie, other policy checks pass). We perform the inexpensive
// checks first and avoid hashing and signature verification unless those
// checks pass, to mitigate CPU exhaustion denial-of-service attacks.
PrecomputedTransactionData txdata(*ptx);
if (!PolicyScriptChecks(args, workspace, txdata)) return false;
if (!ConsensusScriptChecks(args, workspace, txdata)) return false;
// Tx was accepted, but not added
if (args.m_test_accept) return true;
if (!Finalize(args, workspace)) return false;
GetMainSignals().TransactionAddedToMempool(ptx);
return true;
}
} // anon namespace
/** (try to) add transaction to memory pool with a specified acceptance time **/
static bool AcceptToMemoryPoolWithTime(const CChainParams& chainparams, CTxMemPool& pool, CValidationState &state, const CTransactionRef &tx,
bool* pfMissingInputs, int64_t nAcceptTime, std::list<CTransactionRef>* plTxnReplaced,
bool bypass_limits, const CAmount nAbsurdFee, bool test_accept) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
{
std::vector<COutPoint> coins_to_uncache;
bool res = AcceptToMemoryPoolWorker(chainparams, pool, state, tx, pfMissingInputs, nAcceptTime, plTxnReplaced, bypass_limits, nAbsurdFee, coins_to_uncache, test_accept);
MemPoolAccept::ATMPArgs args { chainparams, state, pfMissingInputs, nAcceptTime, plTxnReplaced, bypass_limits, nAbsurdFee, coins_to_uncache, test_accept };
bool res = MemPoolAccept(pool).AcceptSingleTransaction(tx, args);
if (!res) {
// Remove coins that were not present in the coins cache before calling ATMPW;
// this is to prevent memory DoS in case we receive a large number of

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