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Add path expansion to transaction engine.

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This commit is contained in:
Arthur Britto
2012-08-03 14:57:52 -07:00
parent 42bd29c212
commit 1a6a6231cc
4 changed files with 98 additions and 17 deletions
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97
src/TransactionEngine.cpp
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@@ -22,7 +22,8 @@
#define RIPPLE_PATHS_MAX 3
#define QUALITY_ONE 100000000 // 10e9
#define CURRENCY_ONE uint160(1)
#define CURRENCY_ONE uint160(1) // Used as a place holder
#define ACCOUNT_ONE uint160(1) // Used as a place holder
// static STAmount saOne(CURRENCY_ONE, 1, 0);
@@ -2510,6 +2511,85 @@ bool PathState::less(const PathState::pointer& lhs, const PathState::pointer& rh
return lhs->mIndex > rhs->mIndex; // Bigger is worse.
}
// <-- bValid: true, if node is valid.
bool PathState::pushNode(int iType, uint160 uAccountID, uint160 uCurrencyID, uint160 uIssuerID)
{
paymentNode pnCur;
bool bFirst = vpnNodes.empty();
const paymentNode& pnPrv = bFirst ? paymentNode() : vpnNodes.back();
bool bAccount = !!(iType & STPathElement::typeAccount);
bool bCurrency = !!(iType & STPathElement::typeCurrency);
bool bIssuer = !!(iType & STPathElement::typeIssuer);
bool bRedeem = !!(iType & STPathElement::typeRedeem);
bool bIssue = !!(iType & STPathElement::typeIssue);
bool bValid = true;
pnCur.uFlags = iType;
if (iType & ~STPathElement::typeValidBits)
{
bValid = false;
}
else if (bAccount)
{
if (bRedeem || bIssue)
{
// Account link
pnCur.uAccountID = uAccountID;
pnCur.uCurrencyID = bCurrency ? uCurrencyID : pnPrv.uCurrencyID;
pnCur.uIssuerID = bIssuer ? uIssuerID : uAccountID;
// An intermediate node may be implied.
// An offer may be implied
if (uCurrencyID != pnPrv.uCurrencyID)
{
// Implied preceeding offer.
bValid = pushNode(
0,
ACCOUNT_ONE,
CURRENCY_ONE, // Inherit from previous
ACCOUNT_ONE); // Inherit from previous
}
else if (uIssuerID != pnPrv.uIssuerID)
{
// Implied preceeding account.
bValid = pushNode(
STPathElement::typeAccount
| STPathElement::typeRedeem
| STPathElement::typeIssue,
uIssuerID,
CURRENCY_ONE, // Inherit from previous
ACCOUNT_ONE); // Default same as account.
}
}
else
{
bValid = false;
}
}
else
{
// Offer link
if (bRedeem || bIssue)
{
bValid = false;
}
else
{
pnCur.uCurrencyID = bCurrency ? uCurrencyID : pnPrv.uCurrencyID;
pnCur.uIssuerID = bIssuer ? uIssuerID : uAccountID;
}
}
vpnNodes.push_back(pnCur);
return bValid;
}
PathState::PathState(
int iIndex,
const LedgerEntrySet& lesSource,
@@ -2527,17 +2607,14 @@ PathState::PathState(
saOutReq = saSend;
saInReq = saSendMax;
paymentNode pnFirst;
paymentNode pnLast;
pushNode(STPathElement::typeAccount, uSenderID, saSendMax.getCurrency(), saSendMax.getIssuer());
pnLast.uAccountID = uReceiverID;
pnLast.uCurrencyID = saOutReq.getCurrency();
BOOST_FOREACH(const STPathElement& speElement, spSourcePath)
{
pushNode(speElement.getNodeType(), speElement.getAccountID(), speElement.getCurrency(), speElement.getIssuerID());
}
pnFirst.uAccountID = uSenderID;
pnFirst.uCurrencyID = saSendMax.getCurrency();
vpnNodes.push_back(pnFirst);
vpnNodes.push_back(pnLast);
pushNode(STPathElement::typeAccount, uReceiverID, saOutReq.getCurrency(), saOutReq.getIssuer());
}
// Calculate the next increment of a path.