TER computeForwardLiqudity (
RippleCalc& rippleCalc,
const unsigned int nodeIndex, PathState& pathState,
const bool bMultiQuality)
{
auto const& node = pathState.nodes()[nodeIndex];
WriteLog (lsTRACE, RippleCalc)
<< "computeForwardLiqudity> nodeIndex=" << nodeIndex;
TER resultCode = node.isAccount()
? computeForwardLiquidityForAccount (
rippleCalc, nodeIndex, pathState, bMultiQuality)
: computeForwardLiquidityForOffer (
rippleCalc, nodeIndex, pathState, bMultiQuality);
if (resultCode == tesSUCCESS && nodeIndex + 1 != pathState.nodes().size ())
resultCode = computeForwardLiqudity (rippleCalc, nodeIndex + 1, pathState, bMultiQuality);
if (resultCode == tesSUCCESS && !(pathState.inPass() && pathState.outPass()))
resultCode = tecPATH_DRY;
WriteLog (lsTRACE, RippleCalc)
<< "computeForwardLiqudity<"
<< " nodeIndex:" << nodeIndex
<< " resultCode:" << resultCode;
return resultCode;
}
void pathNext (
RippleCalc& rippleCalc,
PathState& pathState, const bool bMultiQuality,
const LedgerEntrySet& lesCheckpoint, LedgerEntrySet& lesCurrent)
{
// The next state is what is available in preference order.
// This is calculated when referenced accounts changed.
pathState.clear();
WriteLog (lsTRACE, RippleCalc)
<< "pathNext: Path In: " << pathState.getJson ();
assert (pathState.nodes().size () >= 2);
lesCurrent = lesCheckpoint.duplicate (); // Restore from checkpoint.
for (unsigned int uIndex = pathState.nodes().size (); uIndex--;)
{
auto& node = pathState.nodes()[uIndex];
node.saRevRedeem.clear ();
node.saRevIssue.clear ();
node.saRevDeliver.clear ();
node.saFwdDeliver.clear ();
}
pathState.setStatus(computeReverseLiquidity (
rippleCalc, pathState, bMultiQuality));
WriteLog (lsTRACE, RippleCalc)
<< "pathNext: Path after reverse: " << pathState.getJson ();
if (tesSUCCESS == pathState.status())
{
// Do forward.
lesCurrent = lesCheckpoint.duplicate (); // Restore from checkpoint.
pathState.setStatus(computeForwardLiquidity (
rippleCalc, pathState, bMultiQuality));
}
if (tesSUCCESS == pathState.status())
{
CondLog (!pathState.inPass() || !pathState.outPass(), lsDEBUG, RippleCalc)
<< "pathNext: Error computeForwardLiquidity reported success for nothing:"
<< " saOutPass="******" inPass()=" << pathState.inPass();
if (!pathState.outPass() || !pathState.inPass())
throw std::runtime_error ("Made no progress.");
// Calculate relative quality.
pathState.setQuality(STAmount::getRate (
pathState.outPass(), pathState.inPass()));
WriteLog (lsTRACE, RippleCalc)
<< "pathNext: Path after forward: " << pathState.getJson ();
}
else
{
pathState.setQuality(0);
}
}
