path::RippleCalc::Output
flow (
PaymentSandbox& sb,
STAmount const& deliver,
AccountID const& src,
AccountID const& dst,
STPathSet const& paths,
bool defaultPaths,
bool partialPayment,
bool ownerPaysTransferFee,
boost::optional<Quality> const& limitQuality,
boost::optional<STAmount> const& sendMax,
beast::Journal j,
path::detail::FlowDebugInfo* flowDebugInfo)
{
Issue const srcIssue = [&] {
if (sendMax)
return sendMax->issue ();
if (!isXRP (deliver.issue ().currency))
return Issue (deliver.issue ().currency, src);
return xrpIssue ();
}();
Issue const dstIssue = deliver.issue ();
boost::optional<Issue> sendMaxIssue;
if (sendMax)
sendMaxIssue = sendMax->issue ();
// convert the paths to a collection of strands. Each strand is the collection
// of account->account steps and book steps that may be used in this payment.
auto sr = toStrands (sb, src, dst, dstIssue, sendMaxIssue, paths,
defaultPaths, ownerPaysTransferFee, j);
if (sr.first != tesSUCCESS)
{
path::RippleCalc::Output result;
result.setResult (sr.first);
return result;
}
auto& strands = sr.second;
if (j.trace())
{
j.trace() << "\nsrc: " << src << "\ndst: " << dst
<< "\nsrcIssue: " << srcIssue << "\ndstIssue: " << dstIssue;
j.trace() << "\nNumStrands: " << strands.size ();
for (auto const& curStrand : strands)
{
j.trace() << "NumSteps: " << curStrand.size ();
for (auto const& step : curStrand)
{
j.trace() << '\n' << *step << '\n';
}
}
}
const bool srcIsXRP = isXRP (srcIssue.currency);
const bool dstIsXRP = isXRP (dstIssue.currency);
auto const asDeliver = toAmountSpec (deliver);
// The src account may send either xrp or iou. The dst account may receive
// either xrp or iou. Since XRP and IOU amounts are represented by different
// types, use templates to tell `flow` about the amount types.
if (srcIsXRP && dstIsXRP)
{
return finishFlow (sb, srcIssue, dstIssue,
flow<XRPAmount, XRPAmount> (
sb, strands, asDeliver.xrp, defaultPaths, partialPayment,
limitQuality, sendMax, j, flowDebugInfo));
}
if (srcIsXRP && !dstIsXRP)
{
return finishFlow (sb, srcIssue, dstIssue,
flow<XRPAmount, IOUAmount> (
sb, strands, asDeliver.iou, defaultPaths, partialPayment,
limitQuality, sendMax, j, flowDebugInfo));
}
if (!srcIsXRP && dstIsXRP)
{
return finishFlow (sb, srcIssue, dstIssue,
flow<IOUAmount, XRPAmount> (
sb, strands, asDeliver.xrp, defaultPaths, partialPayment,
limitQuality, sendMax, j, flowDebugInfo));
}
assert (!srcIsXRP && !dstIsXRP);
return finishFlow (sb, srcIssue, dstIssue,
flow<IOUAmount, IOUAmount> (
sb, strands, asDeliver.iou, defaultPaths, partialPayment,
limitQuality, sendMax, j, flowDebugInfo));
}
