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escrow trustline code finished, untested not compiling

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This commit is contained in:
Richard Holland
2022-03-24 11:53:51 +00:00
parent d94b231ff1
commit ead28a7f2d
1 changed files with 182 additions and 40 deletions
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190
src/ripple/app/tx/impl/Escrow.cpp
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@@ -575,21 +575,51 @@ EscrowFinish::doApply()
}
}
// Transfer amount to destination
auto amount = (*sled)[sfBalance];
auto const sle = ctx_.view().peek(keylet::account(account));
auto amount = (*slep)[sfBalance];
if (isXRP(amount))
{
(*sled)[sfBalance] = (*sled)[sfBalance] + (*slep)[sfAmount];
}
else if (ctx.view.rules().enabled(featurePaychanAndEscrowForTokens))
{
// check if the destination has a trustline already
auto issuer = amount.getIssuer();
auto issuerAccID = amount.getIssuer();
auto currency = amount.getCurrency();
// amendments should only change as much code as is necessary to make the amendment work
// these renames should be applied to the whole class in a later, non-amendment, commit
auto& view = ctx_.view();
auto& sleEscrow = slep;
auto& srcAccID = account;
auto& dstAccID = destID;
bool dstLow = dstAccID < issuerAccID;
bool srcLow = srcAccID < issuerAccID;
auto& sleSrcAcc = sle;
auto& sleDstAcc = sled;
if (!sleSrcAcc)
{
JLOG(ctx_.j.warn())
<< "Src account not found in escrow finish";
return tecINTERNAL;
}
STAmount dstBalanceDrops = sleDstAcc->at[sfBalance];
// check if the destination has a trustline already
Keylet klDstLine = keylet::line(destID, issuer, currency);
auto sleSrcLine = view.peek(keylet::line(srcAccID, issuerAccID, currency));
auto sleDestLine = view.peek(kDestLine);
// check the issuer exists
if (!ctx_.view().exits(keylet::account(issuer)))
if (!view.exist(keylet::account(issuerAccID)))
{
JLOG(ctx_.j.warn())
<< "Cannot finish escrow for token from non-existent issuer: "
@@ -598,14 +628,13 @@ EscrowFinish::doApply()
}
// check the trustline isn't frozen
if (isGlobalFrozen(ctx_.view(), issuer))
if (isGlobalFrozen(view, issuerAccID))
{
JLOG(ctx_.j.warn()) << "Cannot finish an escrow for frozen issuer";
return tecFROZEN;
}
// check the source line exists
auto sleSrcLine = ctx_.view().peek(keylet::line(account, issuer, currency));
if (!sleSrcLine)
{
JLOG(ctx_.j.error())
@@ -616,41 +645,116 @@ EscrowFinish::doApply()
return tefINTERNAL;
}
Keylet k = keylet::line(destID, issuer, currency);
// check if the dest line exists, and if it doesn't create it if we're allowed to
auto sleDestLine = ctx_.view().peek(k);
if (!sleDestLine)
if (!sleDstLine)
{
// if a line doesn't already exist between issuer and destination then
// such a line can now be created but only if either the person who signed
// for this txn is the destination account or the source and dest are the same
if (account != destID && account_ != destID)
if (srcAccID != destAccID && account_ != destAccID)
return tecNO_PERMISSION;
// create trustline
// RH UPTO
if (std::uint32_t const ownerCount = {sleDstAcc->at(sfOwnerCount)};
dstBalanceDrops < view.fees().accountReserve(ownerCount + 1))
{
JLOG(j_.trace()) << "Dest Trust line does not exist. "
"Insufficent reserve to create line.";
return tecNO_LINE_INSUF_RESERVE;
}
// 1. reduce sfLockedBalance on source line by escrow[sfAmount]
// 2. reduce sfBalance on source line by escrow[sfAmount]
// 3. increase sfBalance on dest line by escrow[sfAmount]
// clang-format off
if (TER const ter = trustCreate(
view,
dstLow, // is dest low?
issuerAccID, // source
dstAccID, // destination
klDstLine.key, // ledger index
sleDstAcc, // Account to add to
false, // authorize account
(sleDst->getFlags() & lsfDefaultRipple) == 0,
false, // freeze trust line
amount, // initial balance
Issue(currency, account_), // limit of zero
0, // quality in
0, // quality out
ctx_.j); // journal
!isTesSuccess(ter))
{
return ter;
}
// clang-format on
}
else
{
// trustline already exists
// check is it's frozen
if (destID != issuer)
{
if (sleLine->isFlag(destID > issuer ? lsfHighFreeze : lsfLowFreeze))
{
if (destAccID != issuerAccID &&
sleLine->isFlag(destLow ? lsfLowFreeze : lsfHighFreeze))
JLOG(ctx_.j.warn())
<< "Finishing an escrow for destination frozen trustline.";
return tecFROZEN;
}
// decrement source balance
{
STAmount priorBalance =
srcLow ? (*sleSrcLine)[sfBalance] : -((*sleSrcLine)[sfBalance]);
STAmount finalBalance = priorBalance - amount;
if (finalBalance < beast::zero)
{
JLOG(ctx_.j.warn())
<< "Escrow finish results in a negative balance on source line";
return tecINTERNAL;
}
STAmount priorLockedBalance =
srcLow ? (*sleSrcLine)[sfLockedBalance] : -((*sleSrcLine)[sfLockedBalance]);
STAmount finalLockedBalance = priorLockedBalance - amount;
if (finalLockedBalance < beast::zero)
{
JLOG(ctx_.j.warn())
<< "Escrow finish results in a negative locked balance on source line";
return tecINTERNAL;
}
sleSrcLine.setFieldAmount(sfBalance, srcLow ? finalBalance : -finalBalance);
sleSrcLine.setFieldAmount(sfLockedBalance, srcLow ? finalLockedBalance : -finalLockedBalance);
}
// increment dest balance
{
// if balance is higher than limit then only allow if dest is signer
STAmount dstLimit =
dstLow ? (*sleDstLine)[sfLowLimit] : (*sleDstLine)[sfHighLimit];
STAmount priorBalance =
dstLow ? (*sleDstLine)[sfBalance] : -((*sleDstLine)[sfBalance]);
STAmount finalBalance = priorBalance + amount;
if (finalBalance < priorBalance)
{
JLOG(ctx_.j.warn())
<< "Escrow finish resulted in a lower final balance on dest line";
return tecINTERNAL;
}
if (finalBalance > dstLimit && account_ != destAccID)
{
JLOG(ctx_.j.trace())
<< "Escrow finish would increase dest line above limit without permission";
return tecPATH_DRY;
}
sleDestLine.setFieldAmount(sfBalance, dstLow ? finalBalance : -finalBalance);
}
view.update(sleSrcLine);
view.update(sleDestLine);
}
}
else
@@ -659,7 +763,6 @@ EscrowFinish::doApply()
ctx_.view().update(sled);
// Adjust source owner count
auto const sle = ctx_.view().peek(keylet::account(account));
adjustOwnerCount(ctx_.view(), sle, -1, ctx_.journal);
ctx_.view().update(sle);
@@ -740,9 +843,48 @@ EscrowCancel::doApply()
}
}
// Transfer amount back to owner, decrement owner count
auto const sle = ctx_.view().peek(keylet::account(account));
auto amount = (*slep)[sfBalance];
if (isXRP(amount))
(*sle)[sfBalance] = (*sle)[sfBalance] + (*slep)[sfAmount];
else if (ctx.view.rules().enabled(featurePaychanAndEscrowForTokens))
{
auto issuerAccID = amount.getIssuer();
auto currency = amount.getCurrency();
auto sleSrcLine = view.peek(keylet::line(account, issuerAccID, currency));
bool isLow = account < issuerAccID;
STAmount priorLockedBalance =
isLow ? (*sleSrcLine)[sfLockedBalance] : -(*sleSrcLine)[sfLockedBalance];
STAmount finalLockedBalance = priorLockedBalance - amount;
if (finalLockedBalance < beast::zero)
{
JLOG(ctx_.j.warn())
<< "Escrow cancel would force locked balance below zero";
return tecINTERNAL;
}
STAmount priorBalance =
isLow ? (*sleSrcLine)[sfBalance] : -(*sleSrcLine)[sfBalance];
STAmount finalBalance = priorBalance - amount;
if (finalBalance < beast::zero)
{
JLOG(ctx_.j.warn())
<< "Escrow cancel would force line balance below zero";
return tecINTERNAL;
}
sleSrcLine.setFieldAmount(sfBalance, isLow ? finalBalance : -finalBalance);
sleSrcLine.setFieldAmount(sfLockedBalance, isLow ? finalLockedBalance : -finalLockedBalance);
ctx_view().update(sleSrcLine);
}
else
return tecInternal;
// Transfer amount back to owner, decrement owner count
adjustOwnerCount(ctx_.view(), sle, -1, ctx_.journal);
ctx_.view().update(sle);