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Rough cut at ripple_path_find.

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This commit is contained in:
Arthur Britto
2012-11-22 14:03:32 -08:00
parent b7e18f367b
commit 5c1605ab35
6 changed files with 194 additions and 68 deletions
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74
src/cpp/ripple/Pathfinder.cpp
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@@ -84,7 +84,7 @@ Pathfinder::Pathfinder(RippleAddress& srcAccountID, RippleAddress& dstAccountID,
// Returns a single path, if possible.
// --> maxSearchSteps: unused
// --> maxPay: unused
bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet)
bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet, bool bAllowEmpty)
{
if (mLedger) {
std::queue<STPath> pqueue;
@@ -107,16 +107,28 @@ bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet
// Determine if path is solved.
// Done, if dest wants XRP and last element produces XRP.
// Done, if dest wants non-XRP and last element is dest.
if (!ele.mCurrencyID // Tail output is XRP
&& !mDstAmount.getCurrency()) {
if (!ele.mCurrencyID) {
// Remove implied first.
path.mPath.erase(path.mPath.begin());
// Return the path.
retPathSet.addPath(path);
cLog(lsDEBUG) << "findPaths: adding: " << path.getJson(0);
return true;
}
if (ele.mAccountID == mDstAccountID) {
// Done, if dest wants non-XRP and last element is dest.
// YYY Allows going through self. Is this wanted?
if (ele.mAccountID == mDstAccountID // Tail is destination
&& ele.mCurrencyID == mDstAmount.getCurrency()) { // With correct output currency.
// Found a path to the destination.
if (2 == path.mPath.size()) {
if (!bAllowEmpty && 2 == path.mPath.size()) {
// Empty path is default. Drop it.
// XXX Don't drop empty path - we still want an estimate.
cLog(lsDEBUG) << "findPaths: dropping empty path.";
continue;
}
@@ -128,27 +140,42 @@ bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet
// Return the path.
retPathSet.addPath(path);
cLog(lsDEBUG) << "findPaths: adding: " << path.getJson(0);
return true;
}
bool bContinued = false;
if (!ele.mCurrencyID) {
// Last element is for XRP continue with qualifying books.
BOOST_FOREACH(OrderBook::pointer book, mOrderBook.getXRPInBooks())
{
// XXX Don't allow looping through same order books.
//if (!path.hasSeen(line->getAccountIDPeer().getAccountID()))
{
STPath new_path(path);
STPathElement new_ele(uint160(), book->getCurrencyOut(), book->getIssuerOut());
new_path.mPath.push_back(new_ele);
new_path.mCurrencyID = book->getCurrencyOut();
new_path.mCurrentAccount = book->getCurrencyOut();
new_path.mCurrencyID = book->getCurrencyOut();
new_path.mCurrentAccount = book->getCurrencyOut();
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: XRP input - %s/%s")
% STAmount::createHumanCurrency(new_path.mCurrencyID)
% RippleAddress::createHumanAccountID(new_path.mCurrentAccount));
pqueue.push(new_path);
bContinued = true;
}
}
tLog(!bContinued, lsDEBUG)
<< boost::str(boost::format("findPaths: XRP input - dead end"));
} else {
// Last element is for non-XRP continue by adding ripple lines and order books.
@@ -164,8 +191,17 @@ bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet
ele.mCurrencyID,
uint160());
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: %s/%s --> %s/%s")
% RippleAddress::createHumanAccountID(ele.mAccountID)
% STAmount::createHumanCurrency(ele.mCurrencyID)
% RippleAddress::createHumanAccountID(line->getAccountIDPeer().getAccountID())
% STAmount::createHumanCurrency(ele.mCurrencyID));
new_path.mPath.push_back(new_ele);
pqueue.push(new_path);
bContinued = true;
}
}
@@ -179,17 +215,31 @@ bool Pathfinder::findPaths(int maxSearchSteps, int maxPay, STPathSet& retPathSet
STPath new_path(path);
STPathElement new_ele(uint160(), book->getCurrencyOut(), book->getIssuerOut());
cLog(lsDEBUG) <<
boost::str(boost::format("findPaths: %s/%s :: %s/%s")
% STAmount::createHumanCurrency(ele.mCurrencyID)
% RippleAddress::createHumanAccountID(ele.mAccountID)
% STAmount::createHumanCurrency(book->getCurrencyOut())
% RippleAddress::createHumanAccountID(book->getIssuerOut()));
new_path.mPath.push_back(new_ele);
new_path.mCurrentAccount=book->getIssuerOut();
new_path.mCurrencyID=book->getCurrencyOut();
pqueue.push(new_path);
bContinued = true;
}
}
// enumerate all adjacent nodes, construct a new path and push it into the queue
} // While
} // if there is a ledger
tLog(!bContinued, lsDEBUG)
<< boost::str(boost::format("findPaths: non-XRP input - dead end"));
}
}
else
{
cLog(lsWARNING) << boost::str(boost::format("findPaths: no ledger"));
}
return false;
}