static
Rate
rippleQuality (
ReadView const& view,
AccountID const& destination,
AccountID const& source,
Currency const& currency,
SField const& sfLow,
SField const& sfHigh)
{
if (destination == source)
return parityRate;
auto const& sfField = destination < source ? sfLow : sfHigh;
auto const sle = view.read(
keylet::line(destination, source, currency));
if (!sle || !sle->isFieldPresent (sfField))
return parityRate;
auto quality = sle->getFieldU32 (sfField);
// Avoid divide by zero. NIKB CHECKME: if we
// allow zero qualities now, then we shouldn't.
if (quality == 0)
quality = 1;
return Rate{ quality };
}
std::shared_ptr<SLE const>
RawStateTable::read (ReadView const& base,
Keylet const& k) const
{
auto const iter =
items_.find(k.key);
if (iter == items_.end())
return base.read(k);
auto const& item = iter->second;
if (item.first == Action::erase)
return nullptr;
// Convert to SLE const
std::shared_ptr<
SLE const> sle = item.second;
if (! k.check(*sle))
return nullptr;
return sle;
}
void
fill_seq (Json::Value& jv,
ReadView const& view)
{
if (jv.isMember(jss::Sequence))
return;
auto const account =
parseBase58<AccountID>(
jv[jss::Account].asString());
if (! account)
Throw<parse_error> (
"unexpected invalid Account");
auto const ar = view.read(
keylet::account(*account));
if (! ar)
Throw<parse_error> (
"unexpected missing account root");
jv[jss::Sequence] =
ar->getFieldU32(sfSequence);
}