bool
OfferStream::step (Logs& l)
{
// Modifying the order or logic of these
// operations causes a protocol breaking change.
auto viewJ = l.journal ("View");
for(;;)
{
// BookTip::step deletes the current offer from the view before
// advancing to the next (unless the ledger entry is missing).
if (! tip_.step(l))
return false;
std::shared_ptr<SLE> entry = tip_.entry();
// If we exceed the maximum number of allowed steps, we're done.
if (!counter_.step ())
return false;
// Remove if missing
if (! entry)
{
erase (view_);
erase (cancelView_);
continue;
}
// Remove if expired
using d = NetClock::duration;
using tp = NetClock::time_point;
if (entry->isFieldPresent (sfExpiration) &&
tp{d{(*entry)[sfExpiration]}} <= expire_)
{
JLOG(j_.trace) <<
"Removing expired offer " << entry->getIndex();
offerDelete (cancelView_,
cancelView_.peek(keylet::offer(entry->key())), viewJ);
continue;
}
offer_ = Offer (entry, tip_.quality());
Amounts const amount (offer_.amount());
// Remove if either amount is zero
if (amount.empty())
{
JLOG(j_.warning) <<
"Removing bad offer " << entry->getIndex();
offerDelete (cancelView_,
cancelView_.peek(keylet::offer(entry->key())), viewJ);
offer_ = Offer{};
continue;
}
// Calculate owner funds
auto const owner_funds = accountFunds(view_,
offer_.owner(), amount.out, fhZERO_IF_FROZEN, viewJ);
// Check for unfunded offer
if (owner_funds <= zero)
{
// If the owner's balance in the pristine view is the same,
// we haven't modified the balance and therefore the
// offer is "found unfunded" versus "became unfunded"
auto const original_funds = accountFunds(cancelView_,
offer_.owner(), amount.out, fhZERO_IF_FROZEN, viewJ);
if (original_funds == owner_funds)
{
offerDelete (cancelView_, cancelView_.peek(
keylet::offer(entry->key())), viewJ);
JLOG(j_.trace) <<
"Removing unfunded offer " << entry->getIndex();
}
else
{
JLOG(j_.trace) <<
"Removing became unfunded offer " << entry->getIndex();
}
offer_ = Offer{};
continue;
}
break;
}
return true;
}
bool
OfferStream::step ()
{
// Modifying the order or logic of these
// operations causes a protocol breaking change.
for(;;)
{
// BookTip::step deletes the current offer from the view before
// advancing to the next (unless the ledger entry is missing).
if (! m_tip.step())
return false;
SLE::pointer const& entry (m_tip.entry());
// Remove if missing
if (! entry)
{
erase (view());
erase (view_cancel());
continue;
}
// Remove if expired
if (entry->isFieldPresent (sfExpiration) &&
entry->getFieldU32 (sfExpiration) <= m_when)
{
view_cancel().offerDelete (entry->getIndex());
if (m_journal.trace) m_journal.trace <<
"Removing expired offer " << entry->getIndex();
continue;
}
m_offer = Offer (entry, m_tip.quality());
Amounts const amount (m_offer.amount());
// Remove if either amount is zero
if (amount.empty())
{
view_cancel().offerDelete (entry->getIndex());
if (m_journal.warning) m_journal.warning <<
"Removing bad offer " << entry->getIndex();
m_offer = Offer{};
continue;
}
// Calculate owner funds
// NIKB NOTE The calling code also checks the funds, how expensive is
// looking up the funds twice?
Amount const owner_funds (view().accountFunds (
m_offer.account(), m_offer.amount().out, fhZERO_IF_FROZEN));
// Check for unfunded offer
if (owner_funds <= zero)
{
// If the owner's balance in the pristine view is the same,
// we haven't modified the balance and therefore the
// offer is "found unfunded" versus "became unfunded"
if (view_cancel().accountFunds (m_offer.account(),
m_offer.amount().out, fhZERO_IF_FROZEN) == owner_funds)
{
view_cancel().offerDelete (entry->getIndex());
if (m_journal.trace) m_journal.trace <<
"Removing unfunded offer " << entry->getIndex();
}
else
{
if (m_journal.trace) m_journal.trace <<
"Removing became unfunded offer " << entry->getIndex();
}
m_offer = Offer{};
continue;
}
break;
}
return true;
}
