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Many fixes for path finding.

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This commit is contained in:
Arthur Britto
2013-02-04 15:40:37 -08:00
parent acff2f45f1
commit 83e8e7c624
2 changed files with 106 additions and 67 deletions
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169
src/cpp/ripple/Pathfinder.cpp
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@@ -129,12 +129,13 @@ bool Pathfinder::bDefaultPath(const STPath& spPath)
return false; return false;
} }
//
// XXX Optionally, specifying a source and destination issuer might be nice. Especially, to convert between issuers. However, this
// functionality is left to the future.
//
Pathfinder::Pathfinder(const RippleAddress& uSrcAccountID, const RippleAddress& uDstAccountID, const uint160& uSrcCurrencyID, const uint160& uSrcIssuerID, const STAmount& saDstAmount) Pathfinder::Pathfinder(const RippleAddress& uSrcAccountID, const RippleAddress& uDstAccountID, const uint160& uSrcCurrencyID, const uint160& uSrcIssuerID, const STAmount& saDstAmount)
: mSrcAccountID(uSrcAccountID.getAccountID()), mDstAccountID(uDstAccountID.getAccountID()), mDstAmount(saDstAmount), mSrcCurrencyID(uSrcCurrencyID), mSrcIssuerID(uSrcIssuerID), mOrderBook(theApp->getLedgerMaster().getCurrentLedger()) : mSrcAccountID(uSrcAccountID.getAccountID()),
mDstAccountID(uDstAccountID.getAccountID()),
mDstAmount(saDstAmount),
mSrcCurrencyID(uSrcCurrencyID),
mSrcIssuerID(uSrcIssuerID),
mOrderBook(theApp->getLedgerMaster().getCurrentLedger())
{ {
mLedger = theApp->getLedgerMaster().getCurrentLedger(); mLedger = theApp->getLedgerMaster().getCurrentLedger();
mSrcAmount = STAmount(uSrcCurrencyID, uSrcIssuerID, 1, 0, true); // -1/uSrcIssuerID/uSrcIssuerID mSrcAmount = STAmount(uSrcCurrencyID, uSrcIssuerID, 1, 0, true); // -1/uSrcIssuerID/uSrcIssuerID
@@ -155,14 +156,14 @@ Pathfinder::Pathfinder(const RippleAddress& uSrcAccountID, const RippleAddress&
if (tesSUCCESS == psDefault->terStatus) if (tesSUCCESS == psDefault->terStatus)
{ {
// The default path works, remember it. // The default path works, remember it.
cLog(lsDEBUG) << "Pathfinder: reference path: " << psDefault->getJson(); cLog(lsDEBUG) << "Pathfinder: default path: " << psDefault->getJson();
mPsDefault = psDefault; mPsDefault = psDefault;
} }
else else
{ {
// The default path doesn't work. // The default path doesn't work.
cLog(lsDEBUG) << "Pathfinder: reference path: NONE: " << transToken(psDefault->terStatus); cLog(lsDEBUG) << "Pathfinder: default path: NONE: " << transToken(psDefault->terStatus);
} }
} }
} }
@@ -199,15 +200,29 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
std::vector<STPath> vspResults; std::vector<STPath> vspResults;
std::queue<STPath> qspExplore; // Path stubs to explore. std::queue<STPath> qspExplore; // Path stubs to explore.
// The end is our cursor, start at the source. STPath spSeed;
STPathElement speEnd(mSrcAccountID, mSrcCurrencyID, uint160()); // XXX Might add source issuer. bool bForcedIssuer = !!mSrcCurrencyID && mSrcIssuerID != mSrcAccountID; // Source forced an issuer.
// The end is the cursor, start at the source account.
STPathElement speEnd(mSrcAccountID,
mSrcCurrencyID,
!!mSrcCurrencyID
? mSrcAccountID // Non-XRP, start with self as issuer.
: ACCOUNT_XRP);
// Build a path of one element: the source. // Build a path of one element: the source.
STPath path; spSeed.addElement(speEnd);
path.addElement(speEnd); if (bForcedIssuer)
{
// Add forced source issuer to seed, via issuer's account.
STPathElement speIssuer(mSrcIssuerID, mSrcCurrencyID, mSrcIssuerID);
// Push the source as a path of one element to explore. spSeed.addElement(speEnd);
qspExplore.push(path); }
// Push the seed path to explore.
qspExplore.push(spSeed);
while (qspExplore.size()) { // Have paths to explore? while (qspExplore.size()) { // Have paths to explore?
STPath spPath = qspExplore.front(); STPath spPath = qspExplore.front();
@@ -221,9 +236,15 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
{ {
// Done, cursor produces XRP and dest wants XRP. // Done, cursor produces XRP and dest wants XRP.
// Remove implied first. // Remove implied source.
spPath.mPath.erase(spPath.mPath.begin()); spPath.mPath.erase(spPath.mPath.begin());
if (bForcedIssuer)
{
// Remove implied source issuer.
spPath.mPath.erase(spPath.mPath.begin());
}
if (spPath.size()) if (spPath.size())
{ {
// There is an actual path element. // There is an actual path element.
@@ -252,12 +273,12 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
// YYY Allows going through self. Is this wanted? // YYY Allows going through self. Is this wanted?
if (speEnd.mAccountID == mDstAccountID // Tail is destination account. if (speEnd.mAccountID == mDstAccountID // Tail is destination account.
&& speEnd.mCurrencyID == mDstAmount.getCurrency() // With correct output currency. && speEnd.mCurrencyID == mDstAmount.getCurrency() // With correct output currency.
&& ( speEnd.mIssuerID == mDstAccountID // Dest always accpets own. && ( speEnd.mIssuerID == mDstAccountID // Dest always accepts own issuer.
|| mDstAmount.getIssuer() == mDstAccountID // Any issuer is good. || mDstAmount.getIssuer() == mDstAccountID // Any issuer is good.
|| speEnd.mIssuerID == mDstAmount.getIssuer())) // The desired issuer. || mDstAmount.getIssuer() == speEnd.mIssuerID)) // The desired issuer.
{ {
// Found a path to the destination. // Done, found a path to the destination.
// Done, cursor on the dest account with correct currency and issuer. // Cursor on the dest account with correct currency and issuer.
if (bDefaultPath(spPath)) { if (bDefaultPath(spPath)) {
cLog(lsDEBUG) << "findPaths: dropping: default path: " << spPath.getJson(0); cLog(lsDEBUG) << "findPaths: dropping: default path: " << spPath.getJson(0);
@@ -266,9 +287,15 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
} }
else else
{ {
// Remove implied first and last nodes. // Remove implied nodes.
spPath.mPath.erase(spPath.mPath.begin()); spPath.mPath.erase(spPath.mPath.begin());
if (bForcedIssuer)
{
// Remove implied source issuer.
spPath.mPath.erase(spPath.mPath.begin());
}
spPath.mPath.erase(spPath.mPath.begin() + spPath.mPath.size()-1); spPath.mPath.erase(spPath.mPath.begin() + spPath.mPath.size()-1);
vspResults.push_back(spPath); // Potential result. vspResults.push_back(spPath); // Potential result.
@@ -293,57 +320,68 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
cLog(lsDEBUG) cLog(lsDEBUG)
<< boost::str(boost::format("findPaths: dropping: path would exceed max steps")); << boost::str(boost::format("findPaths: dropping: path would exceed max steps"));
continue;
} }
else if (!speEnd.mCurrencyID) else if (!speEnd.mCurrencyID)
{ {
// Cursor is for XRP, continue with qualifying books. // Cursor is for XRP, continue with qualifying books: XRP -> non-XRP
BOOST_FOREACH(OrderBook::ref book, mOrderBook.getXRPInBooks()) BOOST_FOREACH(OrderBook::ref book, mOrderBook.getXRPInBooks())
{ {
// XXX Don't allow looping through same order books. // New end is an order book with the currency and issuer.
//if (!path.hasSeen(line->getAccountIDPeer().getAccountID())) // Don't allow looping through same order books.
if (!spPath.hasSeen(ACCOUNT_XRP, book->getCurrencyOut(), book->getIssuerOut()))
{ {
STPath new_path(spPath); STPath spNew(spPath);
// New end is an order book with the currency and issuer. STPathElement speBook(ACCOUNT_XRP, book->getCurrencyOut(), book->getIssuerOut());
STPathElement new_ele(uint160(), book->getCurrencyOut(), book->getIssuerOut()); STPathElement speAccount(book->getIssuerOut(), book->getCurrencyOut(), book->getIssuerOut());
new_path.mPath.push_back(new_ele); spNew.mPath.push_back(speBook); // Add the order book.
spNew.mPath.push_back(speAccount); // Add the account and currency
cLog(lsDEBUG) << cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: XRP input -> %s/%s") boost::str(boost::format("findPaths: XRP -> %s/%s")
% STAmount::createHumanCurrency(new_ele.mCurrencyID) % STAmount::createHumanCurrency(speBook.mCurrencyID)
% RippleAddress::createHumanAccountID(new_ele.mIssuerID)); % RippleAddress::createHumanAccountID(speBook.mIssuerID));
qspExplore.push(new_path); qspExplore.push(spNew);
bContinued = true; bContinued = true;
} }
} }
tLog(!bContinued, lsDEBUG) tLog(!bContinued, lsDEBUG)
<< boost::str(boost::format("findPaths: XRP input -> dead end")); << boost::str(boost::format("findPaths: XRP -> dead end"));
} }
else else
{ {
// Last element is for non-XRP, continue by adding ripple lines and order books. // Last element is for non-XRP, continue by adding ripple lines and order books.
// Create new paths for each outbound account not already in the path. // Create new paths for each outbound account not already in the path.
AccountItems rippleLines(speEnd.mIssuerID, mLedger, AccountItem::pointer(new RippleState())); AccountItems rippleLines(speEnd.mAccountID, mLedger, AccountItem::pointer(new RippleState()));
SLE::pointer sleSrc = lesActive.entryCache(ltACCOUNT_ROOT, Ledger::getAccountRootIndex(speEnd.mIssuerID)); SLE::pointer sleSrc = lesActive.entryCache(ltACCOUNT_ROOT, Ledger::getAccountRootIndex(speEnd.mAccountID));
tLog(sleSrc, lsDEBUG)
<< boost::str(boost::format("findPaths: account without root: %s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID));
bool bRequireAuth = isSetBit(sleSrc->getFieldU32(sfFlags), lsfRequireAuth); bool bRequireAuth = isSetBit(sleSrc->getFieldU32(sfFlags), lsfRequireAuth);
BOOST_FOREACH(AccountItem::ref item, rippleLines.getItems()) BOOST_FOREACH(AccountItem::ref item, rippleLines.getItems())
{ {
RippleState* rspEntry = (RippleState*) item.get(); RippleState* rspEntry = (RippleState*) item.get();
const uint160 uPeerID = rspEntry->getAccountIDPeer().getAccountID();
if (spPath.hasSeen(rspEntry->getAccountIDPeer().getAccountID())) if (spPath.hasSeen(uPeerID, speEnd.mCurrencyID, uPeerID))
{ {
// Peer is in path already. Ignore it to avoid a loop. // Peer is in path already. Ignore it to avoid a loop.
cLog(lsDEBUG) << cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: SEEN: %s/%s --> %s/%s") boost::str(boost::format("findPaths: SEEN: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID) % RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID) % STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(rspEntry->getAccountIDPeer().getAccountID()) % RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)); % STAmount::createHumanCurrency(speEnd.mCurrencyID));
} }
else if (!rspEntry->getBalance().isPositive() // No IOUs to send. else if (!rspEntry->getBalance().isPositive() // No IOUs to send.
@@ -353,31 +391,29 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
{ {
// Path has no credit left. Ignore it. // Path has no credit left. Ignore it.
cLog(lsDEBUG) << cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: No credit: %s/%s --> %s/%s") boost::str(boost::format("findPaths: No credit: %s/%s -> %s/%s")
% RippleAddress::createHumanAccountID(speEnd.mAccountID) % RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID) % STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(rspEntry->getAccountIDPeer().getAccountID()) % RippleAddress::createHumanAccountID(uPeerID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID)); % STAmount::createHumanCurrency(speEnd.mCurrencyID));
} }
else else
{ {
// Can transmit IOUs. // Can transmit IOUs and account to the path.
STPath new_path(spPath); STPath spNew(spPath);
STPathElement new_ele(rspEntry->getAccountIDPeer().getAccountID(), STPathElement speNew(uPeerID, speEnd.mCurrencyID, uPeerID);
speEnd.mCurrencyID,
rspEntry->getAccountIDPeer().getAccountID()); spNew.mPath.push_back(speNew);
qspExplore.push(spNew);
bContinued = true;
cLog(lsDEBUG) << cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: push explore: %s/%s --> %s/%s") boost::str(boost::format("findPaths: push explore: %s/%s -> %s/%s")
% STAmount::createHumanCurrency(speEnd.mCurrencyID) % STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mAccountID) % RippleAddress::createHumanAccountID(speEnd.mAccountID)
% STAmount::createHumanCurrency(speEnd.mCurrencyID) % STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(rspEntry->getAccountIDPeer().getAccountID())); % RippleAddress::createHumanAccountID(uPeerID));
new_path.mPath.push_back(new_ele);
qspExplore.push(new_path);
bContinued = true;
} }
} }
@@ -386,27 +422,30 @@ bool Pathfinder::findPaths(const unsigned int iMaxSteps, const unsigned int iMax
mOrderBook.getBooks(speEnd.mIssuerID, speEnd.mCurrencyID, books); mOrderBook.getBooks(speEnd.mIssuerID, speEnd.mCurrencyID, books);
BOOST_FOREACH(OrderBook::ref book,books) BOOST_FOREACH(OrderBook::ref book, books)
{ {
STPath new_path(spPath); if (!spPath.hasSeen(ACCOUNT_XRP, book->getCurrencyOut(), book->getIssuerOut()))
STPathElement new_ele(uint160(), book->getCurrencyOut(), book->getIssuerOut()); {
// A book we haven't seen before. Add it.
STPath spNew(spPath);
STPathElement speBook(ACCOUNT_XRP, book->getCurrencyOut(), book->getIssuerOut());
cLog(lsDEBUG) << spNew.mPath.push_back(speBook);
boost::str(boost::format("findPaths: %s/%s :: %s/%s") qspExplore.push(spNew);
% STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mIssuerID)
% STAmount::createHumanCurrency(book->getCurrencyOut())
% RippleAddress::createHumanAccountID(book->getIssuerOut()));
new_path.mPath.push_back(new_ele); bContinued = true;
qspExplore.push(new_path); cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: push book: %s/%s -> %s/%s")
bContinued = true; % STAmount::createHumanCurrency(speEnd.mCurrencyID)
% RippleAddress::createHumanAccountID(speEnd.mIssuerID)
% STAmount::createHumanCurrency(book->getCurrencyOut())
% RippleAddress::createHumanAccountID(book->getIssuerOut()));
}
} }
tLog(!bContinued, lsDEBUG) tLog(!bContinued, lsDEBUG)
<< boost::str(boost::format("findPaths: non-XRP input - dead end")); << boost::str(boost::format("findPaths: dropping: non-XRP -> dead end"));
} }
} }

4
test/path-test.js
View File

@@ -12,9 +12,9 @@ require('../src/js/config').load(require('./config'));
buster.testRunner.timeout = 5000; buster.testRunner.timeout = 5000;
buster.testCase("Basic Path finding", { buster.testCase("Basic Path finding", {
// 'setUp' : testutils.build_setup({ verbose: true, no_server: true }),
// 'setUp' : testutils.build_setup({ verbose: true }),
'setUp' : testutils.build_setup(), 'setUp' : testutils.build_setup(),
// 'setUp' : testutils.build_setup({ verbose: true }),
// 'setUp' : testutils.build_setup({ verbose: true, no_server: true }),
'tearDown' : testutils.build_teardown(), 'tearDown' : testutils.build_teardown(),
"no direct path, no intermediary -> no alternatives" : "no direct path, no intermediary -> no alternatives" :