/**
* This method should not affect market execution or validation and
* is for historical purposes only.
*/
void update_market_history( const asset& trading_volume,
const price& opening_price,
const price& closing_price,
const omarket_status& market_stat,
const fc::time_point_sec& timestamp )
{
if( trading_volume.amount > 0 && get_next_bid() && get_next_ask() )
{
market_history_key key(_quote_id, _base_id, market_history_key::each_block, _db_impl._head_block_header.timestamp);
market_history_record new_record(_current_bid->get_price(),
_current_ask->get_price(),
opening_price,
closing_price,
trading_volume.amount);
FC_ASSERT( market_stat );
new_record.recent_average_price = market_stat->center_price;
//LevelDB iterators are dumb and don't support proper past-the-end semantics.
auto last_key_itr = _db_impl._market_history_db.lower_bound(key);
if( !last_key_itr.valid() )
last_key_itr = _db_impl._market_history_db.last();
else
--last_key_itr;
key.timestamp = timestamp;
//Unless the previous record for this market is the same as ours...
if( (!(last_key_itr.valid()
&& last_key_itr.key().quote_id == _quote_id
&& last_key_itr.key().base_id == _base_id
&& last_key_itr.key().granularity == market_history_key::each_block
&& last_key_itr.value() == new_record)) )
{
//...add a new entry to the history table.
_pending_state->market_history[key] = new_record;
}
fc::time_point_sec start_of_this_hour = timestamp - (timestamp.sec_since_epoch() % (60*60));
market_history_key old_key(_quote_id, _base_id, market_history_key::each_hour, start_of_this_hour);
if( auto opt = _db_impl._market_history_db.fetch_optional(old_key) )
{
auto old_record = *opt;
old_record.volume += new_record.volume;
if( new_record.highest_bid > old_record.highest_bid || new_record.lowest_ask < old_record.lowest_ask )
{
old_record.highest_bid = std::max(new_record.highest_bid, old_record.highest_bid);
old_record.lowest_ask = std::min(new_record.lowest_ask, old_record.lowest_ask);
old_record.recent_average_price = new_record.recent_average_price;
_pending_state->market_history[old_key] = old_record;
}
}
else
_pending_state->market_history[old_key] = new_record;
fc::time_point_sec start_of_this_day = timestamp - (timestamp.sec_since_epoch() % (60*60*24));
old_key = market_history_key(_quote_id, _base_id, market_history_key::each_day, start_of_this_day);
if( auto opt = _db_impl._market_history_db.fetch_optional(old_key) )
{
auto old_record = *opt;
old_record.volume += new_record.volume;
if( new_record.highest_bid > old_record.highest_bid || new_record.lowest_ask < old_record.lowest_ask )
{
old_record.highest_bid = std::max(new_record.highest_bid, old_record.highest_bid);
old_record.lowest_ask = std::min(new_record.lowest_ask, old_record.lowest_ask);
old_record.recent_average_price = new_record.recent_average_price;
_pending_state->market_history[old_key] = old_record;
}
}
else
_pending_state->market_history[old_key] = new_record;
}
}
void execute( asset_id_type quote_id, asset_id_type base_id, const fc::time_point_sec& timestamp )
{
try {
_quote_id = quote_id;
_base_id = base_id;
auto quote_asset = _pending_state->get_asset_record( _quote_id );
// DISABLE MARKET ISSUED ASSETS
if( quote_asset->is_market_issued() )
return; // don't execute anything.
// the order book is soreted from low to high price, so to get the last item (highest bid), we need to go to the first item in the
// next market class and then back up one
auto next_pair = base_id+1 == quote_id ? price( 0, quote_id+1, 0) : price( 0, quote_id, base_id+1 );
_bid_itr = _db_impl._bid_db.lower_bound( market_index_key( next_pair ) );
_ask_itr = _db_impl._ask_db.lower_bound( market_index_key( price( 0, quote_id, base_id) ) );
_short_itr = _db_impl._short_db.lower_bound( market_index_key( next_pair ) );
_collateral_itr = _db_impl._collateral_db.lower_bound( market_index_key( next_pair ) );
if( !_ask_itr.valid() )
{
wlog( "ask iter invalid..." );
_ask_itr = _db_impl._ask_db.begin();
}
if( _short_itr.valid() ) --_short_itr;
else _short_itr = _db_impl._short_db.last();
if( _bid_itr.valid() ) --_bid_itr;
else _bid_itr = _db_impl._bid_db.last();
if( _collateral_itr.valid() ) --_collateral_itr;
else _collateral_itr = _db_impl._collateral_db.last();
asset consumed_bid_depth(0,base_id);
asset consumed_ask_depth(0,base_id);
asset usd_fees_collected(0,quote_id);
asset trading_volume(0, base_id);
omarket_status market_stat = _pending_state->get_market_status( _quote_id, _base_id );
if( !market_stat.valid() )
{
if( quote_asset->is_market_issued() ) FC_CAPTURE_AND_THROW( insufficient_depth, (market_stat) );
FC_ASSERT( market_stat.valid() );
}
while( get_next_bid() && get_next_ask() )
{
idump( (_current_bid)(_current_ask) );
price ask_price = _current_ask->get_price();
// this works for bids, asks, and shorts.... but in the case of a cover
// the current ask can go lower than the call price in order to match
// the bid....
if( _current_ask->type == cover_order )
{
ask_price = std::min( _current_bid->get_price(), _current_ask->get_highest_cover_price() );
}
if( _current_bid->get_price() < ask_price )
break;
if( quote_asset->is_market_issued() )
{
if( !market_stat ||
market_stat->ask_depth < BTS_BLOCKCHAIN_MARKET_DEPTH_REQUIREMENT/2 ||
market_stat->bid_depth < BTS_BLOCKCHAIN_MARKET_DEPTH_REQUIREMENT/2
)
FC_CAPTURE_AND_THROW( insufficient_depth, (market_stat) );
}
auto quantity = std::min( _current_bid->get_quantity(), _current_ask->get_quantity() );
auto usd_paid_by_bid = quantity * _current_bid->get_price();
auto usd_received_by_ask = quantity * _current_ask->get_price();
auto xts_paid_by_ask = quantity;
auto xts_received_by_bid = quantity;
consumed_bid_depth += quantity;
consumed_ask_depth += quantity;
if( _current_bid->type == short_order )
{
usd_paid_by_bid = usd_received_by_ask;
}
if( _current_ask->type == cover_order )
{
usd_received_by_ask = usd_paid_by_bid;
}
FC_ASSERT( usd_paid_by_bid.amount >= 0 );
FC_ASSERT( xts_paid_by_ask.amount >= 0 );
FC_ASSERT( usd_received_by_ask.amount >= 0 );
FC_ASSERT( xts_received_by_bid.amount >= 0 );
FC_ASSERT( usd_paid_by_bid >= usd_received_by_ask );
FC_ASSERT( xts_paid_by_ask >= xts_received_by_bid );
// sanity check to keep supply from growing without bound
FC_ASSERT( usd_paid_by_bid < asset(quote_asset->maximum_share_supply,quote_id), "", ("usd_paid_by_bid",usd_paid_by_bid)("asset",quote_asset) );
usd_fees_collected += usd_paid_by_bid - usd_received_by_ask;
idump( (usd_fees_collected)(xts_paid_by_ask)(xts_received_by_bid)(quantity) );
market_transaction mtrx;
mtrx.bid_owner = _current_bid->get_owner();
mtrx.ask_owner = _current_ask->get_owner();
mtrx.bid_price = _current_bid->get_price();
mtrx.ask_price = ask_price;
mtrx.bid_paid = usd_paid_by_bid;
mtrx.bid_received = xts_received_by_bid;
mtrx.ask_paid = xts_paid_by_ask;
mtrx.ask_received = usd_received_by_ask;
mtrx.bid_type = _current_bid->type;
mtrx.fees_collected = xts_paid_by_ask - xts_received_by_bid;
_market_transactions.push_back(mtrx);
trading_volume += mtrx.bid_received;
market_stat->ask_depth -= xts_paid_by_ask.amount;
if( _current_ask->type == ask_order )
{
/* rounding errors on price cause this not to go to 0 in some cases */
if( quantity == _current_ask->get_quantity() )
_current_ask->state.balance = 0;
else
_current_ask->state.balance -= xts_paid_by_ask.amount;
FC_ASSERT( _current_ask->state.balance >= 0 );
auto ask_balance_address = withdraw_condition( withdraw_with_signature(_current_ask->get_owner()), quote_id ).get_address();
auto ask_payout = _pending_state->get_balance_record( ask_balance_address );
if( !ask_payout )
ask_payout = balance_record( _current_ask->get_owner(), asset(0,quote_id), 0 );
ask_payout->balance += usd_received_by_ask.amount;
ask_payout->last_update = _pending_state->now();
_pending_state->store_balance_record( *ask_payout );
_pending_state->store_ask_record( _current_ask->market_index, _current_ask->state );
}
else if( _current_ask->type == cover_order )
{
elog( "MATCHING COVER ORDER recv_usd: ${usd} paid_collat: ${c}",
("usd",usd_received_by_ask)("c",xts_paid_by_ask) );
wlog( "current ask: ${c}", ("c",_current_ask) );
// we are in the margin call range...
_current_ask->state.balance -= usd_received_by_ask.amount;
*(_current_ask->collateral) -= xts_paid_by_ask.amount;
FC_ASSERT( _current_ask->state.balance >= 0 );
FC_ASSERT( *_current_ask->collateral >= 0 );
if( _current_ask->state.balance == 0 ) // no more USD left
{ // send collateral home to mommy & daddy
wlog( " collateral balance is now 0!" );
auto ask_balance_address = withdraw_condition(
withdraw_with_signature(_current_ask->get_owner()),
base_id ).get_address();
auto ask_payout = _pending_state->get_balance_record( ask_balance_address );
if( !ask_payout )
ask_payout = balance_record( _current_ask->get_owner(), asset(0,base_id), 0 );
ask_payout->balance += (*_current_ask->collateral);
ask_payout->last_update = _pending_state->now();
_pending_state->store_balance_record( *ask_payout );
_current_ask->collateral = 0;
}
wlog( "storing collateral ${c}", ("c",_current_ask) );
_pending_state->store_collateral_record( _current_ask->market_index,
collateral_record( *_current_ask->collateral,
_current_ask->state.balance ) );
}
if( _current_bid->type == bid_order )
{
_current_bid->state.balance -= usd_paid_by_bid.amount;
FC_ASSERT( _current_bid->state.balance >= 0 );
auto bid_payout = _pending_state->get_balance_record(
withdraw_condition( withdraw_with_signature(_current_bid->get_owner()), base_id ).get_address() );
if( !bid_payout )
bid_payout = balance_record( _current_bid->get_owner(), asset(0,base_id), 0 );
bid_payout->balance += xts_received_by_bid.amount;
bid_payout->last_update = _pending_state->now();
_pending_state->store_balance_record( *bid_payout );
_pending_state->store_bid_record( _current_bid->market_index, _current_bid->state );
}
else if( _current_bid->type == short_order )
{
market_stat->bid_depth -= xts_received_by_bid.amount;
// TODO: what if the amount paid is 0 for bid and ask due to rounding errors,
// make sure this doesn't put us in an infinite loop.
if( quantity == _current_bid->get_quantity() )
_current_bid->state.balance = 0;
else
_current_bid->state.balance -= xts_received_by_bid.amount;
FC_ASSERT( _current_bid->state.balance >= 0 );
auto collateral = (xts_paid_by_ask + xts_received_by_bid).amount;
auto cover_price = usd_received_by_ask / asset( (3*collateral)/4, base_id );
market_index_key cover_index( cover_price, _current_ask->get_owner() );
auto ocover_record = _pending_state->get_collateral_record( cover_index );
if( NOT ocover_record )
ocover_record = collateral_record();
ocover_record->collateral_balance += collateral;
ocover_record->payoff_balance += usd_received_by_ask.amount;
FC_ASSERT( ocover_record->payoff_balance >= 0 );
FC_ASSERT( ocover_record->collateral_balance >= 0 );
_pending_state->store_collateral_record( cover_index, *ocover_record );
_pending_state->store_short_record( _current_bid->market_index, _current_bid->state );
}
} // while bid && ask
if( quote_asset->is_market_issued() )
{
if( !market_stat ||
market_stat->ask_depth < BTS_BLOCKCHAIN_MARKET_DEPTH_REQUIREMENT/2 ||
market_stat->bid_depth < BTS_BLOCKCHAIN_MARKET_DEPTH_REQUIREMENT/2
)
FC_CAPTURE_AND_THROW( insufficient_depth, (market_stat) );
}
_pending_state->store_market_status( *market_stat );
if( trading_volume.amount > 0 && get_next_bid() && get_next_ask() )
{
market_history_key key(quote_id, base_id, market_history_key::each_block, _db_impl._head_block_header.timestamp);
market_history_record new_record(_current_bid->get_price(), _current_ask->get_price(), trading_volume.amount);
//LevelDB iterators are dumb and don't support proper past-the-end semantics.
auto last_key_itr = _db_impl._market_history_db.lower_bound(key);
if( !last_key_itr.valid() )
last_key_itr = _db_impl._market_history_db.last();
else
--last_key_itr;
key.timestamp = timestamp;
//Unless the previous record for this market is the same as ours...
if( (!(last_key_itr.valid()
&& last_key_itr.key().quote_id == quote_id
&& last_key_itr.key().base_id == base_id
&& last_key_itr.key().granularity == market_history_key::each_block
&& last_key_itr.value() == new_record)) )
{
//...add a new entry to the history table.
_pending_state->market_history[key] = new_record;
}
fc::time_point_sec start_of_this_hour = timestamp - (timestamp.sec_since_epoch() % (60*60));
market_history_key old_key(quote_id, base_id, market_history_key::each_hour, start_of_this_hour);
if( auto opt = _db_impl._market_history_db.fetch_optional(old_key) )
{
auto old_record = *opt;
old_record.volume += new_record.volume;
if( new_record.highest_bid > old_record.highest_bid || new_record.lowest_ask < old_record.lowest_ask )
{
old_record.highest_bid = std::max(new_record.highest_bid, old_record.highest_bid);
old_record.lowest_ask = std::min(new_record.lowest_ask, old_record.lowest_ask);
_pending_state->market_history[old_key] = old_record;
}
}
else
_pending_state->market_history[old_key] = new_record;
fc::time_point_sec start_of_this_day = timestamp - (timestamp.sec_since_epoch() % (60*60*24));
old_key = market_history_key(quote_id, base_id, market_history_key::each_day, start_of_this_day);
if( auto opt = _db_impl._market_history_db.fetch_optional(old_key) )
{
auto old_record = *opt;
old_record.volume += new_record.volume;
if( new_record.highest_bid > old_record.highest_bid || new_record.lowest_ask < old_record.lowest_ask )
{
old_record.highest_bid = std::max(new_record.highest_bid, old_record.highest_bid);
old_record.lowest_ask = std::min(new_record.lowest_ask, old_record.lowest_ask);
_pending_state->market_history[old_key] = old_record;
}
}
else
_pending_state->market_history[old_key] = new_record;
}
auto market_state = _pending_state->get_market_status( quote_id, base_id );
if( !market_state )
market_state = market_status( quote_id, base_id, 0, 0 );
market_state->last_error.reset();
_pending_state->store_market_status( *market_state );
wlog( "done matching orders" );
_pending_state->apply_changes();
}
catch( const fc::exception& e )
{
wlog( "error executing market ${quote} / ${base}\n ${e}", ("quote",quote_id)("base",base_id)("e",e.to_detail_string()) );
auto market_state = _prior_state->get_market_status( quote_id, base_id );
if( !market_state )
market_state = market_status( quote_id, base_id, 0, 0 );
market_state->last_error = e;
_prior_state->store_market_status( *market_state );
}
} // execute(...)
void execute( asset_id_type quote_id, asset_id_type base_id, const fc::time_point_sec& timestamp )
{
try
{
const uint32_t pending_block_num = _pending_state->get_head_block_num();
_quote_id = quote_id;
_base_id = base_id;
oasset_record quote_asset = _pending_state->get_asset_record( _quote_id );
oasset_record base_asset = _pending_state->get_asset_record( _base_id );
FC_ASSERT( quote_asset.valid() && base_asset.valid() );
// The order book is sorted from low to high price. So to get the last item (highest bid),
// we need to go to the first item in the next market class and then back up one
const price next_pair = (base_id+1 == quote_id) ? price( 0, quote_id+1, 0 ) : price( 0, quote_id, base_id+1 );
_bid_itr = _db_impl._bid_db.lower_bound( market_index_key( next_pair ) );
_ask_itr = _db_impl._ask_db.lower_bound( market_index_key( price( 0, quote_id, base_id) ) );
_short_itr = _db_impl._short_db.lower_bound( market_index_key( price( 0, quote_id, base_id) ) );
_collateral_itr = _db_impl._collateral_db.lower_bound( market_index_key( next_pair ) );
if( !_ask_itr.valid() )
{
wlog( "ask iter invalid..." );
_ask_itr = _db_impl._ask_db.begin();
}
if( _bid_itr.valid() ) --_bid_itr;
else _bid_itr = _db_impl._bid_db.last();
if( _collateral_itr.valid() ) --_collateral_itr;
else _collateral_itr = _db_impl._collateral_db.last();
asset trading_volume(0, base_id);
// Set initial market status
{
omarket_status market_stat = _pending_state->get_market_status( _quote_id, _base_id );
if( !market_stat ) market_stat = market_status( quote_id, base_id, 0, 0 );
_market_stat = *market_stat;
}
price min_cover_ask;
price opening_price;
price closing_price;
const oprice median_feed_price = _db_impl.self->get_median_delegate_price( quote_id, base_id );
if( quote_asset->is_market_issued() )
{
// If bootstrapping market for the very first time
if( _market_stat.center_price.ratio == fc::uint128_t() )
{
if( median_feed_price.valid() )
_market_stat.center_price = *median_feed_price;
else
FC_CAPTURE_AND_THROW( insufficient_feeds, (quote_id) );
}
min_cover_ask = _market_stat.minimum_ask();
}
int last_orders_filled = -1;
bool order_did_execute = false;
// prime the pump, to make sure that margin calls (asks) have a bid to check against.
get_next_bid(); get_next_ask();
idump( (_current_bid)(_current_ask) );
while( get_next_bid() && get_next_ask() )
{
idump( (_current_bid)(_current_ask) );
// Make sure that at least one order was matched every time we enter the loop
FC_ASSERT( _orders_filled != last_orders_filled, "We appear caught in an order matching loop" );
last_orders_filled = _orders_filled;
const asset bid_quantity_xts = _current_bid->get_quantity();
const asset ask_quantity_xts = _current_ask->get_quantity();
asset current_bid_balance = _current_bid->get_balance();
// Initialize the market transaction
market_transaction mtrx;
mtrx.bid_owner = _current_bid->get_owner();
mtrx.ask_owner = _current_ask->get_owner();
// Always execute shorts at the center price
mtrx.bid_price = (_current_bid->type != short_order) ? _current_bid->get_price() : _market_stat.center_price;
mtrx.ask_price = _current_ask->get_price();
mtrx.bid_type = _current_bid->type;
mtrx.ask_type = _current_ask->type;
if( _current_ask->type == cover_order && _current_bid->type == short_order )
{
FC_ASSERT( quote_asset->is_market_issued() );
/** don't allow new shorts to execute unless there is a feed, all other
* trades are still valid. (we shouldn't stop the market)
*/
if( !median_feed_price.valid() )
{
_current_bid.reset();
continue;
}
if( mtrx.ask_price < mtrx.bid_price ) // The call price has not been reached
break;
if( _current_bid->state.short_price_limit.valid() )
{
if( *_current_bid->state.short_price_limit < mtrx.ask_price )
{
_current_bid.reset();
continue; // skip shorts that are over the price limit.
}
mtrx.bid_price = *_current_bid->state.short_price_limit;
}
mtrx.ask_price = mtrx.bid_price;
// Bound collateral ratio
price collateral_rate = _current_bid->get_price();
if( collateral_rate > _market_stat.center_price )
collateral_rate = _market_stat.center_price;
const asset ask_quantity_usd = _current_ask->get_quote_quantity();
const asset short_quantity_usd = _current_bid->get_balance() / collateral_rate;
const asset trade_quantity_usd = std::min( short_quantity_usd, ask_quantity_usd );
mtrx.ask_received = trade_quantity_usd;
mtrx.bid_paid = mtrx.ask_received;
mtrx.ask_paid = mtrx.ask_received * mtrx.ask_price;
mtrx.bid_received = mtrx.ask_paid;
mtrx.bid_collateral = mtrx.bid_paid / collateral_rate;
// Handle rounding errors
if( (*mtrx.bid_collateral - _current_bid->get_balance()).amount < BTS_BLOCKCHAIN_PRECISION )
mtrx.bid_collateral = _current_bid->get_balance();
// If too little collateral at this price
if( *mtrx.bid_collateral < mtrx.ask_paid )
{
edump( (mtrx) );
_current_bid.reset();
continue;
}
pay_current_short( mtrx, *quote_asset );
pay_current_cover( mtrx, *quote_asset );
_market_stat.bid_depth -= mtrx.bid_collateral->amount;
_market_stat.ask_depth += mtrx.bid_collateral->amount;
order_did_execute = true;
}
else if( _current_ask->type == cover_order && _current_bid->type == bid_order )
{
FC_ASSERT( quote_asset->is_market_issued() );
if( mtrx.ask_price < mtrx.bid_price ) // The call price has not been reached
break;
/**
* Don't allow margin calls to be executed too far below
* the minimum ask, this could lead to an attack where someone
* walks the whole book to steal the collateral.
*/
if( mtrx.bid_price < _market_stat.minimum_ask() )
{
_current_ask.reset();
continue;
}
mtrx.ask_price = mtrx.bid_price;
const asset max_usd_purchase = asset( *_current_ask->collateral, _base_id ) * mtrx.bid_price;
asset usd_exchanged = std::min( current_bid_balance, max_usd_purchase );
// Bound quote asset amount exchanged
const asset required_usd_purchase = _current_ask->get_balance();
if( required_usd_purchase < usd_exchanged )
usd_exchanged = required_usd_purchase;
mtrx.ask_received = usd_exchanged;
mtrx.bid_paid = mtrx.ask_received;
// Handle rounding errors
if( usd_exchanged == max_usd_purchase )
mtrx.ask_paid = asset(*_current_ask->collateral,_base_id);
else
mtrx.ask_paid = usd_exchanged * mtrx.bid_price;
mtrx.bid_received = mtrx.ask_paid;
pay_current_bid( mtrx, *quote_asset );
pay_current_cover( mtrx, *quote_asset );
// TODO: Do we need to decrease bid depth as well?
_market_stat.ask_depth -= mtrx.ask_paid.amount;
order_did_execute = true;
}
else if( _current_ask->type == ask_order && _current_bid->type == short_order )
{
FC_ASSERT( quote_asset->is_market_issued() );
/** don't allow new shorts to execute unless there is a feed, all other
* trades are still valid.
*/
if( !median_feed_price.valid() )
{
_current_bid.reset();
continue;
}
if( mtrx.bid_price < mtrx.ask_price ) // The ask price hasn't been reached
break;
if( _current_bid->state.short_price_limit.valid() )
{
if( *_current_bid->state.short_price_limit < mtrx.ask_price )
{
elog( "short price limit < bid price" );
_current_bid.reset();
continue; // skip shorts that are over the price limit.
}
mtrx.bid_price = *_current_bid->state.short_price_limit;
}
// Bound collateral ratio
price collateral_rate = _current_bid->get_price();
if( collateral_rate > _market_stat.center_price )
collateral_rate = _market_stat.center_price;
const asset ask_quantity_usd = _current_ask->get_quote_quantity();
const asset short_quantity_usd = _current_bid->get_balance() / collateral_rate;
const asset trade_quantity_usd = std::min( short_quantity_usd, ask_quantity_usd );
mtrx.ask_received = trade_quantity_usd;
mtrx.bid_paid = mtrx.ask_received;
mtrx.ask_paid = mtrx.ask_received * mtrx.ask_price;
mtrx.bid_received = mtrx.ask_paid;
mtrx.bid_collateral = mtrx.bid_paid / collateral_rate;
// Handle rounding errors
if( (*mtrx.bid_collateral - _current_bid->get_balance()).amount < BTS_BLOCKCHAIN_PRECISION )
mtrx.bid_collateral = _current_bid->get_balance();
// If too little collateral at this price
if( *mtrx.bid_collateral < mtrx.ask_paid )
{
edump( (mtrx) );
_current_bid.reset();
continue;
}
pay_current_short( mtrx, *quote_asset );
pay_current_ask( mtrx, *quote_asset );
_market_stat.bid_depth -= mtrx.bid_collateral->amount;
_market_stat.ask_depth += mtrx.bid_collateral->amount;
order_did_execute = true;
}
else if( _current_ask->type == ask_order && _current_bid->type == bid_order )
{
if( mtrx.bid_price < mtrx.ask_price ) // The ask price hasn't been reached
break;
const asset quantity_xts = std::min( bid_quantity_xts, ask_quantity_xts );
// Everyone gets the price they asked for
mtrx.ask_received = quantity_xts * mtrx.ask_price;
mtrx.bid_paid = quantity_xts * mtrx.bid_price;
mtrx.ask_paid = quantity_xts;
mtrx.bid_received = quantity_xts;
// Handle rounding errors
if( quantity_xts == bid_quantity_xts )
mtrx.bid_paid = current_bid_balance;
mtrx.fees_collected = mtrx.bid_paid - mtrx.ask_received;
pay_current_bid( mtrx, *quote_asset );
pay_current_ask( mtrx, *base_asset );
// TODO: Do we need to decrease bid depth as well?
_market_stat.ask_depth -= mtrx.ask_paid.amount;
order_did_execute = true;
}
push_market_transaction( mtrx );
if( mtrx.ask_received.asset_id == 0 )
trading_volume += mtrx.ask_received;
else if( mtrx.bid_received.asset_id == 0 )
trading_volume += mtrx.bid_received;
if( opening_price == price() )
opening_price = mtrx.bid_price;
closing_price = mtrx.bid_price;
if( mtrx.fees_collected.asset_id == base_asset->id )
base_asset->collected_fees += mtrx.fees_collected.amount;
else if( mtrx.fees_collected.asset_id == quote_asset->id )
quote_asset->collected_fees += mtrx.fees_collected.amount;
} // while( next bid && next ask )
// update any fees collected
_pending_state->store_asset_record( *quote_asset );
_pending_state->store_asset_record( *base_asset );
_market_stat.last_error.reset();
// Force at least one center price update every 6 blocks
order_did_execute |= (pending_block_num % 6) == 0;
if( _current_bid && _current_ask && order_did_execute )
{
if( median_feed_price.valid() )
{
_market_stat.center_price = *median_feed_price;
}
else if( _current_bid->type != short_order ) // we cannot use short prices for this
{
_market_stat.center_price.ratio *= (BTS_BLOCKCHAIN_BLOCKS_PER_HOUR-1);
const price max_bid = _market_stat.maximum_bid();
// limit the maximum movement rate of the price.
if( _current_bid->get_price() < min_cover_ask )
_market_stat.center_price.ratio += min_cover_ask.ratio;
else if( _current_bid->get_price() > max_bid )
_market_stat.center_price.ratio += max_bid.ratio;
else
_market_stat.center_price.ratio += _current_bid->get_price().ratio;
if( _current_ask->get_price() < min_cover_ask )
_market_stat.center_price.ratio += min_cover_ask.ratio;
else if( _current_ask->get_price() > max_bid )
_market_stat.center_price.ratio += max_bid.ratio;
else
_market_stat.center_price.ratio += _current_ask->get_price().ratio;
_market_stat.center_price.ratio /= (BTS_BLOCKCHAIN_BLOCKS_PER_HOUR+1);
}
}
// Update market status and market history
_pending_state->store_market_status( _market_stat );
update_market_history( trading_volume, opening_price, closing_price, _market_stat, timestamp );
wlog( "done matching orders" );
idump( (_current_bid)(_current_ask) );
_pending_state->apply_changes();
}
catch( const fc::exception& e )
{
wlog( "error executing market ${quote} / ${base}\n ${e}", ("quote",quote_id)("base",base_id)("e",e.to_detail_string()) );
auto market_state = _prior_state->get_market_status( quote_id, base_id );
if( !market_state )
market_state = market_status( quote_id, base_id, 0, 0 );
market_state->last_error = e;
_prior_state->store_market_status( *market_state );
}
} // execute(...)