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Account for minimum reserve in potential spend:

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* Relevant when deciding whether an account can queue multiple
  transactions. If the potential spend of the already queued
  transactions would dip into the reserve, the reserve is
  preserved for fees.
* Also change several direct modifications of the owner count to
  call adjustOwnerCount to preserve overflow checking.
* Update related unit testcase
* Resolves #2251
This commit is contained in:
Edward Hennis
2018-11-01 17:52:59 -04:00
committed by Nik Bougalis
parent 60dc949314
commit e7a69cce65
4 changed files with 184 additions and 56 deletions
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21
src/ripple/app/misc/impl/TxQ.cpp
View File

@@ -912,11 +912,23 @@ TxQ::apply(Application& app, OpenView& view,
LastLedgerSeq and MaybeTx::retriesRemaining.
*/
auto const balance = (*sle)[sfBalance].xrp();
/* Get the minimum possible reserve. If fees exceed
this amount, the transaction can't be queued.
Considering that typical fees are several orders
of magnitude smaller than any current or expected
future reserve, this calculation is simpler than
trying to figure out the potential changes to
the ownerCount that may occur to the account
as a result of these transactions, and removes
any need to account for other transactions that
may affect the owner count while these are queued.
*/
auto const reserve = view.fees().accountReserve(0);
auto totalFee = multiTxn->fee;
if (multiTxn->includeCurrentFee)
totalFee += (*tx)[sfFee].xrp();
if (totalFee >= balance ||
totalFee >= view.fees().accountReserve(0))
totalFee >= reserve)
{
// Drop the current transaction
JLOG(j_.trace()) <<
@@ -933,9 +945,12 @@ TxQ::apply(Application& app, OpenView& view,
auto const sleBump = multiTxn->applyView->peek(
keylet::account(account));
auto const potentialTotalSpend = multiTxn->fee +
std::min(balance - std::min(balance, reserve),
multiTxn->potentialSpend);
assert(potentialTotalSpend > 0);
sleBump->setFieldAmount(sfBalance,
balance - (multiTxn->fee +
multiTxn->potentialSpend));
balance - potentialTotalSpend);
sleBump->setFieldU32(sfSequence, tSeq);
}
}