TER TransactionEngine::applyTransaction (
STTx const& txn,
TransactionEngineParams params,
bool& didApply)
{
WriteLog (lsTRACE, TransactionEngine) << "applyTransaction>";
didApply = false;
assert (mLedger);
uint256 const& txID = txn.getTransactionID ();
mNodes.init (mLedger, txID, mLedger->getLedgerSeq (), params);
#ifdef BEAST_DEBUG
if (1)
{
Serializer ser;
txn.add (ser);
SerializerIterator sit (ser);
STTx s2 (sit);
if (!s2.isEquivalent (txn))
{
WriteLog (lsFATAL, TransactionEngine) <<
"Transaction serdes mismatch";
WriteLog (lsINFO, TransactionEngine) << txn.getJson (0);
WriteLog (lsFATAL, TransactionEngine) << s2.getJson (0);
assert (false);
}
}
#endif
if (!txID)
{
WriteLog (lsWARNING, TransactionEngine) <<
"applyTransaction: invalid transaction id";
return temINVALID;
}
TER terResult = Transactor::transact (txn, params, this);
if (terResult == temUNKNOWN)
{
WriteLog (lsWARNING, TransactionEngine) <<
"applyTransaction: Invalid transaction: unknown transaction type";
return temUNKNOWN;
}
if (ShouldLog (lsDEBUG, TransactionEngine))
{
std::string strToken;
std::string strHuman;
transResultInfo (terResult, strToken, strHuman);
WriteLog (lsDEBUG, TransactionEngine) <<
"applyTransaction: terResult=" << strToken <<
" : " << terResult <<
" : " << strHuman;
}
if (isTesSuccess (terResult))
didApply = true;
else if (isTecClaim (terResult) && !(params & tapRETRY))
{
// only claim the transaction fee
WriteLog (lsDEBUG, TransactionEngine) << "Reprocessing to only claim fee";
mNodes.clear ();
SLE::pointer txnAcct = entryCache (ltACCOUNT_ROOT,
getAccountRootIndex (txn.getSourceAccount ()));
if (!txnAcct)
terResult = terNO_ACCOUNT;
else
{
std::uint32_t t_seq = txn.getSequence ();
std::uint32_t a_seq = txnAcct->getFieldU32 (sfSequence);
if (a_seq < t_seq)
terResult = terPRE_SEQ;
else if (a_seq > t_seq)
terResult = tefPAST_SEQ;
else
{
STAmount fee = txn.getTransactionFee ();
STAmount balance = txnAcct->getFieldAmount (sfBalance);
STAmount balanceVBC = txnAcct->getFieldAmount(sfBalanceVBC);
// We retry/reject the transaction if the account
// balance is zero or we're applying against an open
// ledger and the balance is less than the fee
if ((balance == zero) || (balanceVBC.getNValue() == 0) ||
((params & tapOPEN_LEDGER) && (balance < fee)))
{
// Account has no funds or ledger is open
terResult = terINSUF_FEE_B;
}
else
{
if (fee > balance)
fee = balance;
txnAcct->setFieldAmount (sfBalance, balance - fee);
txnAcct->setFieldAmount(sfBalanceVBC, balanceVBC);
txnAcct->setFieldU32 (sfSequence, t_seq + 1);
entryModify (txnAcct);
didApply = true;
}
}
}
}
else
WriteLog (lsDEBUG, TransactionEngine) << "Not applying transaction " << txID;
if (didApply)
{
if (!checkInvariants (terResult, txn, params))
{
WriteLog (lsFATAL, TransactionEngine) <<
"Transaction violates invariants";
WriteLog (lsFATAL, TransactionEngine) <<
txn.getJson (0);
WriteLog (lsFATAL, TransactionEngine) <<
transToken (terResult) << ": " << transHuman (terResult);
WriteLog (lsFATAL, TransactionEngine) <<
mNodes.getJson (0);
didApply = false;
terResult = tefINTERNAL;
}
else
{
// Transaction succeeded fully or (retries are not allowed and the
// transaction could claim a fee)
Serializer m;
mNodes.calcRawMeta (m, terResult, mTxnSeq++);
txnWrite ();
Serializer s;
txn.add (s);
if (params & tapOPEN_LEDGER)
{
if (!mLedger->addTransaction (txID, s))
{
WriteLog (lsFATAL, TransactionEngine) <<
"Tried to add transaction to open ledger that already had it";
assert (false);
throw std::runtime_error ("Duplicate transaction applied");
}
}
else
{
if (!mLedger->addTransaction (txID, s, m))
{
WriteLog (lsFATAL, TransactionEngine) <<
"Tried to add transaction to ledger that already had it";
assert (false);
throw std::runtime_error ("Duplicate transaction applied to closed ledger");
}
// Charge whatever fee they specified.
STAmount saPaid = txn.getTransactionFee ();
mLedger->destroyCoins (saPaid.getNValue ());
}
}
}
mTxnAccount.reset ();
mNodes.clear ();
if (!(params & tapOPEN_LEDGER) && isTemMalformed (terResult))
{
// XXX Malformed or failed transaction in closed ledger must bow out.
}
return terResult;
}
//------------------------------------------------------------------------------
std::pair<TER, bool>
Transactor::operator()()
{
JLOG(j_.trace()) << "apply: " << ctx_.tx.getTransactionID ();
#ifdef BEAST_DEBUG
{
Serializer ser;
ctx_.tx.add (ser);
SerialIter sit(ser.slice());
STTx s2 (sit);
if (! s2.isEquivalent(ctx_.tx))
{
JLOG(j_.fatal()) <<
"Transaction serdes mismatch";
JLOG(j_.info()) << to_string(ctx_.tx.getJson (0));
JLOG(j_.fatal()) << s2.getJson (0);
assert (false);
}
}
#endif
auto result = ctx_.preclaimResult;
if (result == tesSUCCESS)
result = apply();
// No transaction can return temUNKNOWN from apply,
// and it can't be passed in from a preclaim.
assert(result != temUNKNOWN);
if (auto stream = j_.trace())
stream << "preclaim result: " << transToken(result);
bool applied = isTesSuccess (result);
auto fee = ctx_.tx.getFieldAmount(sfFee).xrp ();
if (ctx_.size() > oversizeMetaDataCap)
result = tecOVERSIZE;
if ((result == tecOVERSIZE) ||
(isTecClaimHardFail (result, view().flags())))
{
JLOG(j_.trace()) << "reapplying because of " << transToken(result);
std::vector<uint256> removedOffers;
if (result == tecOVERSIZE)
{
ctx_.visit (
[&removedOffers](
uint256 const& index,
bool isDelete,
std::shared_ptr <SLE const> const& before,
std::shared_ptr <SLE const> const& after)
{
if (isDelete)
{
assert (before && after);
if (before && after &&
(before->getType() == ltOFFER) &&
(before->getFieldAmount(sfTakerPays) == after->getFieldAmount(sfTakerPays)))
{
// Removal of offer found or made unfunded
removedOffers.push_back (index);
}
}
});
}
// Reset the context, potentially adjusting the fee
fee = reset(fee);
// If necessary, remove any offers found unfunded during processing
if (result == tecOVERSIZE)
removeUnfundedOffers (view(), removedOffers, ctx_.app.journal ("View"));
applied = true;
}
if (applied)
{
// Check invariants: if `tecINVARIANT_FAILED` is not returned, we can
// proceed to apply the tx
result = ctx_.checkInvariants(result, fee);
if (result == tecINVARIANT_FAILED)
{
// if invariants checking failed again, reset the context and
// attempt to only claim a fee.
fee = reset(fee);
// Check invariants again to ensure the fee claiming doesn't
// violate invariants.
result = ctx_.checkInvariants(result, fee);
}
// We ran through the invariant checker, which can, in some cases,
// return a tef error code. Don't apply the transaction in that case.
if (!isTecClaim(result) && !isTesSuccess(result))
applied = false;
}
if (applied)
{
// Transaction succeeded fully or (retries are not allowed and the
// transaction could claim a fee)
// The transactor and invariant checkers guarantee that this will
// *never* trigger but if it, somehow, happens, don't allow a tx
// that charges a negative fee.
if (fee < beast::zero)
Throw<std::logic_error> ("fee charged is negative!");
// Charge whatever fee they specified. The fee has already been
// deducted from the balance of the account that issued the
// transaction. We just need to account for it in the ledger
// header.
if (!view().open() && fee != beast::zero)
ctx_.destroyXRP (fee);
// Once we call apply, we will no longer be able to look at view()
ctx_.apply(result);
}
JLOG(j_.trace()) << (applied ? "applied" : "not applied") << transToken(result);
return { result, applied };
}