bool database::apply_order(const limit_order_object& new_order_object, bool allow_black_swan)
{
auto order_id = new_order_object.id;
const asset_object& sell_asset = get(new_order_object.amount_for_sale().asset_id);
const asset_object& receive_asset = get(new_order_object.amount_to_receive().asset_id);
// Possible optimization: We only need to check calls if both are true:
// - The new order is at the front of the book
// - The new order is below the call limit price
bool called_some = check_call_orders(sell_asset, allow_black_swan);
called_some |= check_call_orders(receive_asset, allow_black_swan);
if( called_some && !find_object(order_id) ) // then we were filled by call order
return true;
const auto& limit_price_idx = get_index_type<limit_order_index>().indices().get<by_price>();
// TODO: it should be possible to simply check the NEXT/PREV iterator after new_order_object to
// determine whether or not this order has "changed the book" in a way that requires us to
// check orders. For now I just lookup the lower bound and check for equality... this is log(n) vs
// constant time check. Potential optimization.
auto max_price = ~new_order_object.sell_price;
auto limit_itr = limit_price_idx.lower_bound(max_price.max());
auto limit_end = limit_price_idx.upper_bound(max_price);
bool finished = false;
while( !finished && limit_itr != limit_end )
{
auto old_limit_itr = limit_itr;
++limit_itr;
// match returns 2 when only the old order was fully filled. In this case, we keep matching; otherwise, we stop.
finished = (match(new_order_object, *old_limit_itr, old_limit_itr->sell_price) != 2);
}
//Possible optimization: only check calls if the new order completely filled some old order
//Do I need to check both assets?
check_call_orders(sell_asset, allow_black_swan);
check_call_orders(receive_asset, allow_black_swan);
const limit_order_object* updated_order_object = find< limit_order_object >( order_id );
if( updated_order_object == nullptr )
return true;
if( head_block_time() <= HARDFORK_555_TIME )
return false;
// before #555 we would have done maybe_cull_small_order() logic as a result of fill_order() being called by match() above
// however after #555 we need to get rid of small orders -- #555 hardfork defers logic that was done too eagerly before, and
// this is the point it's deferred to.
return maybe_cull_small_order( *this, *updated_order_object );
}
bool database::apply_order(const limit_order_object& new_order_object, bool allow_black_swan)
{
auto order_id = new_order_object.id;
const asset_object& sell_asset = get(new_order_object.amount_for_sale().asset_id);
const asset_object& receive_asset = get(new_order_object.amount_to_receive().asset_id);
// Possible optimization: We only need to check calls if both are true:
// - The new order is at the front of the book
// - The new order is below the call limit price
bool called_some = check_call_orders(sell_asset, allow_black_swan);
called_some |= check_call_orders(receive_asset, allow_black_swan);
if( called_some && !find_object(order_id) ) // then we were filled by call order
return true;
const auto& limit_price_idx = get_index_type<limit_order_index>().indices().get<by_price>();
// TODO: it should be possible to simply check the NEXT/PREV iterator after new_order_object to
// determine whether or not this order has "changed the book" in a way that requires us to
// check orders. For now I just lookup the lower bound and check for equality... this is log(n) vs
// constant time check. Potential optimization.
auto max_price = ~new_order_object.sell_price;
auto limit_itr = limit_price_idx.lower_bound(max_price.max());
auto limit_end = limit_price_idx.upper_bound(max_price);
bool finished = false;
while( !finished && limit_itr != limit_end )
{
auto old_limit_itr = limit_itr;
++limit_itr;
// match returns 2 when only the old order was fully filled. In this case, we keep matching; otherwise, we stop.
finished = (match(new_order_object, *old_limit_itr, old_limit_itr->sell_price) != 2);
}
//Possible optimization: only check calls if the new order completely filled some old order
//Do I need to check both assets?
check_call_orders(sell_asset, allow_black_swan);
check_call_orders(receive_asset, allow_black_swan);
return find_object(order_id) == nullptr;
}
void database::update_expired_feeds()
{
auto& asset_idx = get_index_type<asset_index>().indices();
for( const asset_object& a : asset_idx )
{
if( !a.is_market_issued() )
continue;
const asset_bitasset_data_object& b = a.bitasset_data(*this);
if( b.feed_is_expired(head_block_time()) )
{
modify(b, [this](asset_bitasset_data_object& a) {
a.update_median_feeds(head_block_time());
});
check_call_orders(b.current_feed.settlement_price.base.asset_id(*this));
}
if( !b.current_feed.core_exchange_rate.is_null() &&
a.options.core_exchange_rate != b.current_feed.core_exchange_rate )
modify(a, [&b](asset_object& a) {
a.options.core_exchange_rate = b.current_feed.core_exchange_rate;
});
}
}