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Fixes for brute force path finding.

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This commit is contained in:
Arthur Britto
2013-02-13 17:00:30 -08:00
parent 235ab44728
commit e62e5f5fa2
1 changed files with 61 additions and 49 deletions
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110
src/cpp/ripple/Pathfinder.cpp
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@@ -339,7 +339,7 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mIssuerID));
if (spPath.mPath.size() == iMaxSteps)
if (spPath.mPath.size() >= iMaxSteps)
{
// Path is at maximum size. Don't want to add more.
@@ -365,8 +365,8 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
spNew.mPath.push_back(speBook); // Add the order book.
spNew.mPath.push_back(speAccount); // Add the account and currency
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: XRP -> %s/%s")
cLog(lsDEBUG)
<< boost::str(boost::format("findPaths: XRP -> %s/%s")
% STAmount::createHumanCurrency(speBook.mCurrencyID)
% RippleAddress::createHumanAccountID(speBook.mIssuerID));
@@ -387,64 +387,68 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
AccountItems rippleLines(speEnd.mAccountID, mLedger, AccountItem::pointer(new RippleState()));
SLE::pointer sleEnd = lesActive.entryCache(ltACCOUNT_ROOT, Ledger::getAccountRootIndex(speEnd.mAccountID));
tLog(sleEnd, lsDEBUG)
<< boost::str(boost::format("findPaths: account without root: %s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID));
tLog(!sleEnd, lsDEBUG)
<< boost::str(boost::format("findPaths: order book: %s/%s : ")
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% RippleAddress::createHumanAccountID(speEnd.mIssuerID));
bool bRequireAuth = isSetBit(sleEnd->getFieldU32(sfFlags), lsfRequireAuth);
BOOST_FOREACH(AccountItem::ref item, rippleLines.getItems())
if (sleEnd)
{
RippleState* rspEntry = (RippleState*) item.get();
const uint160 uPeerID = rspEntry->getAccountIDPeer().getAccountID();
// On a non-XRP account:
bool bRequireAuth = isSetBit(sleEnd->getFieldU32(sfFlags), lsfRequireAuth);
if (spPath.hasSeen(uPeerID, speEnd.mCurrencyID, uPeerID))
BOOST_FOREACH(AccountItem::ref item, rippleLines.getItems())
{
// Peer is in path already. Ignore it to avoid a loop.
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: SEEN: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID));
}
else if (!rspEntry->getBalance().isPositive() // No IOUs to send.
&& (!rspEntry->getLimitPeer() // Peer does not extend credit.
|| *rspEntry->getBalance().negate() >= rspEntry->getLimitPeer() // No credit left.
|| (bRequireAuth && !rspEntry->getAuth()))) // Not authorized to hold credit.
{
// Path has no credit left. Ignore it.
cLog(lsTRACE) <<
boost::str(boost::format("findPaths: No credit: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID));
}
else
{
// Can transmit IOUs and account to the path.
STPath spNew(spPath);
STPathElement speNew(uPeerID, speEnd.mCurrencyID, uPeerID);
RippleState* rspEntry = (RippleState*) item.get();
const uint160 uPeerID = rspEntry->getAccountIDPeer().getAccountID();
spNew.mPath.push_back(speNew);
qspExplore.push(spNew);
if (spPath.hasSeen(uPeerID, speEnd.mCurrencyID, uPeerID))
{
// Peer is in path already. Ignore it to avoid a loop.
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: SEEN: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID));
}
else if (!rspEntry->getBalance().isPositive() // No IOUs to send.
&& (!rspEntry->getLimitPeer() // Peer does not extend credit.
|| *rspEntry->getBalance().negate() >= rspEntry->getLimitPeer() // No credit left.
|| (bRequireAuth && !rspEntry->getAuth()))) // Not authorized to hold credit.
{
// Path has no credit left. Ignore it.
cLog(lsTRACE) <<
boost::str(boost::format("findPaths: No credit: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID));
}
else
{
// Can transmit IOUs and account to the path.
STPath spNew(spPath);
STPathElement speNew(uPeerID, speEnd.mCurrencyID, uPeerID);
bContinued = true;
spNew.mPath.push_back(speNew);
qspExplore.push(spNew);
cLog(lsTRACE) <<
boost::str(boost::format("findPaths: push explore: %s/%s -> %s/%s")
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID));
bContinued = true;
cLog(lsTRACE) <<
boost::str(boost::format("findPaths: push explore: %s/%s -> %s/%s")
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(uPeerID));
}
}
}
// Every book that wants the source currency.
std::vector<OrderBook::pointer> books;
theApp->getOrderBookDB().getBooks(speEnd.mIssuerID, speEnd.mCurrencyID, books);
BOOST_FOREACH(OrderBook::ref book, books)
@@ -455,7 +459,15 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
STPath spNew(spPath);
STPathElement speBook(ACCOUNT_XRP, book->getCurrencyOut(), book->getIssuerOut());
spNew.mPath.push_back(speBook);
spNew.mPath.push_back(speBook); // Add the order book.
if (!book->getCurrencyOut())
{
// For non-XRP out, don't end on the book, add the issuing account.
STPathElement speAccount(book->getIssuerOut(), book->getCurrencyOut(), book->getIssuerOut());
spNew.mPath.push_back(speAccount); // Add the account and currency
}
qspExplore.push(spNew);
bContinued = true;