ConsensusImp::ConsensusImp (
FeeVote::Setup const& voteSetup,
Logs& logs)
: journal_ (logs.journal("Consensus"))
, feeVote_ (make_FeeVote (voteSetup,
logs.journal("FeeVote")))
, proposing_ (false)
, validating_ (false)
, lastCloseProposers_ (0)
, lastCloseConvergeTook_ (LEDGER_IDLE_INTERVAL)
, lastValidationTimestamp_ (0s)
, lastCloseTime_ (0s)
{
}
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;
}
