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Don't let offer taker spend savings.

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Arthur Britto
2013-01-27 11:52:02 -08:00
parent 1cbe6be1bd
commit 26a3cebf2e
2 changed files with 22 additions and 26 deletions
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26
src/cpp/ripple/OfferCreateTransactor.cpp
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@@ -11,7 +11,7 @@ SETUP_LOG();
// --> uBookBase: The order book to take against. // --> uBookBase: The order book to take against.
// --> saTakerPays: What the taker offers (w/ issuer) // --> saTakerPays: What the taker offers (w/ issuer)
// --> saTakerGets: What the taker wanted (w/ issuer) // --> saTakerGets: What the taker wanted (w/ issuer)
// <-- saTakerPaid: What taker paid not including fees. To reduce an offer. // <-- saTakerPaid: What taker paid including saved not including fees. To reduce an offer.
// <-- saTakerGot: What taker got not including fees. To reduce an offer. // <-- saTakerGot: What taker got not including fees. To reduce an offer.
// <-- terResult: tesSUCCESS or terNO_ACCOUNT // <-- terResult: tesSUCCESS or terNO_ACCOUNT
// <-- bUnfunded: if tesSUCCESS, consider offer unfunded after taking. // <-- bUnfunded: if tesSUCCESS, consider offer unfunded after taking.
@@ -33,6 +33,7 @@ TER OfferCreateTransactor::takeOffers(
uint256 uTipIndex = uBookBase; uint256 uTipIndex = uBookBase;
const uint256 uBookEnd = Ledger::getQualityNext(uBookBase); const uint256 uBookEnd = Ledger::getQualityNext(uBookBase);
const uint64 uTakeQuality = STAmount::getRate(saTakerGets, saTakerPays); const uint64 uTakeQuality = STAmount::getRate(saTakerGets, saTakerPays);
STAmount saTakerRate = STAmount::setRate(uTakeQuality);
const uint160 uTakerPaysAccountID = saTakerPays.getIssuer(); const uint160 uTakerPaysAccountID = saTakerPays.getIssuer();
const uint160 uTakerGetsAccountID = saTakerGets.getIssuer(); const uint160 uTakerGetsAccountID = saTakerGets.getIssuer();
TER terResult = temUNCERTAIN; TER terResult = temUNCERTAIN;
@@ -51,10 +52,9 @@ TER OfferCreateTransactor::takeOffers(
uint64 uTipQuality; uint64 uTipQuality;
// Figure out next offer to take, if needed. // Figure out next offer to take, if needed.
if (saTakerGets != saTakerGot && saTakerPays != saTakerPaid) if (saTakerGot < saTakerGets // Have less than wanted.
&& saTakerPaid < saTakerPays) // Didn't spend all funds.
{ {
// Taker, still, needs to get and pay.
sleOfferDir = mEngine->entryCache(ltDIR_NODE, mEngine->getLedger()->getNextLedgerIndex(uTipIndex, uBookEnd)); sleOfferDir = mEngine->entryCache(ltDIR_NODE, mEngine->getLedger()->getNextLedgerIndex(uTipIndex, uBookEnd));
if (sleOfferDir) if (sleOfferDir)
{ {
@@ -219,24 +219,20 @@ TER OfferCreateTransactor::takeOffers(
if (!bUnfunded) if (!bUnfunded)
{ {
// Offer owner pays taker. terResult = mEngine->getNodes().accountSend(uOfferOwnerID, uTakerAccountID, saSubTakerGot); // Offer owner pays taker.
// saSubTakerGot.setIssuer(uTakerGetsAccountID); // XXX Move this earlier?
terResult = mEngine->getNodes().accountSend(uOfferOwnerID, uTakerAccountID, saSubTakerGot);
if (tesSUCCESS == terResult) if (tesSUCCESS == terResult)
terResult = mEngine->getNodes().accountSend(uOfferOwnerID, uTakerGetsAccountID, saOfferIssuerFee); terResult = mEngine->getNodes().accountSend(uOfferOwnerID, uTakerGetsAccountID, saOfferIssuerFee); // Offer owner pays issuer transfer fee.
// Taker pays offer owner.
// saSubTakerPaid.setIssuer(uTakerPaysAccountID);
if (tesSUCCESS == terResult) if (tesSUCCESS == terResult)
terResult = mEngine->getNodes().accountSend(uTakerAccountID, uOfferOwnerID, saSubTakerPaid); terResult = mEngine->getNodes().accountSend(uTakerAccountID, uOfferOwnerID, saSubTakerPaid); // Taker pays offer owner.
if (tesSUCCESS == terResult) if (tesSUCCESS == terResult)
terResult = mEngine->getNodes().accountSend(uTakerAccountID, uTakerPaysAccountID, saTakerIssuerFee); terResult = mEngine->getNodes().accountSend(uTakerAccountID, uTakerPaysAccountID, saTakerIssuerFee); // Taker pays issuer transfer fee.
// Reduce amount considered paid by taker's rate (not actual cost).
saTakerPaid += std::min(saPay, STAmount::multiply(saSubTakerGot, saTakerRate, saPay));
saTakerGot += saSubTakerGot; saTakerGot += saSubTakerGot;
saTakerPaid += saSubTakerPaid;
if (tesSUCCESS == terResult) if (tesSUCCESS == terResult)
terResult = temUNCERTAIN; terResult = temUNCERTAIN;
@@ -394,7 +390,7 @@ TER OfferCreateTransactor::doApply()
mTxnAccount, mTxnAccount,
saTakerGets, saTakerGets,
saTakerPays, saTakerPays,
saOfferPaid, // How much was spent. saOfferPaid, // How much would have spent at full price.
saOfferGot, // How much was got. saOfferGot, // How much was got.
bUnfunded); bUnfunded);

2
test/offer-test.js
View File

@@ -74,7 +74,7 @@ buster.testCase("Offer tests", {
}); });
}, },
"offer create then crossing offer, no trust lines with self" : "Offer create then self crossing offer, no trust lines with self" :
function (done) { function (done) {
var self = this; var self = this;