359 lines
16 KiB
C++
359 lines
16 KiB
C++
#include <graphene/chain/database.hpp>
|
|
#include <graphene/chain/account_object.hpp>
|
|
#include <graphene/chain/asset_object.hpp>
|
|
#include <graphene/chain/betting_market_object.hpp>
|
|
#include <graphene/chain/event_object.hpp>
|
|
|
|
#include <boost/range/iterator_range.hpp>
|
|
|
|
namespace graphene { namespace chain {
|
|
|
|
void database::cancel_bet( const bet_object& bet, bool create_virtual_op )
|
|
{
|
|
asset amount_to_refund = bet.amount_to_bet;
|
|
amount_to_refund += bet.amount_reserved_for_fees;
|
|
//TODO: update global statistics
|
|
adjust_balance(bet.bettor_id, amount_to_refund); //return unmatched stake + fees
|
|
//TODO: do special fee accounting as required
|
|
if (create_virtual_op)
|
|
push_applied_operation(bet_canceled_operation(bet.bettor_id, bet.id,
|
|
bet.amount_to_bet,
|
|
bet.amount_reserved_for_fees));
|
|
remove(bet);
|
|
}
|
|
|
|
void database::cancel_all_unmatched_bets_on_betting_market(const betting_market_object& betting_market)
|
|
{
|
|
const auto& bet_odds_idx = get_index_type<bet_object_index>().indices().get<by_odds>();
|
|
auto book_itr = bet_odds_idx.lower_bound(std::make_tuple(betting_market.id));
|
|
auto book_end = bet_odds_idx.upper_bound(std::make_tuple(betting_market.id));
|
|
while (book_itr != book_end)
|
|
{
|
|
auto old_book_itr = book_itr;
|
|
++book_itr;
|
|
cancel_bet(*old_book_itr, true);
|
|
}
|
|
}
|
|
|
|
void database::cancel_all_betting_markets_for_event(const event_object& event_obj)
|
|
{
|
|
auto& betting_market_group_index = get_index_type<betting_market_group_object_index>().indices().get<by_event_id>();
|
|
auto& betting_market_index = get_index_type<betting_market_object_index>().indices().get<by_betting_market_group_id>();
|
|
|
|
//for each betting market group of event
|
|
for (const betting_market_group_object& betting_market_group :
|
|
boost::make_iterator_range(betting_market_group_index.equal_range(event_obj.id)))
|
|
resolve_betting_market_group(betting_market_group, {});
|
|
}
|
|
|
|
void database::validate_betting_market_group_resolutions(const betting_market_group_object& betting_market_group,
|
|
const std::map<betting_market_id_type, betting_market_resolution_type>& resolutions)
|
|
{
|
|
auto& betting_market_index = get_index_type<betting_market_object_index>().indices().get<by_betting_market_group_id>();
|
|
auto betting_market_itr = betting_market_index.lower_bound(betting_market_group.id);
|
|
while (betting_market_itr != betting_market_index.end() && betting_market_itr->group_id == betting_market_group.id)
|
|
{
|
|
const betting_market_object& betting_market = *betting_market_itr;
|
|
// every betting market in the group tied with resolution
|
|
assert(resolutions.count(betting_market.id));
|
|
++betting_market_itr;
|
|
}
|
|
}
|
|
|
|
void database::resolve_betting_market_group(const betting_market_group_object& betting_market_group,
|
|
const std::map<betting_market_id_type, betting_market_resolution_type>& resolutions,
|
|
bool do_not_remove)
|
|
{
|
|
bool cancel = resolutions.size() == 0;
|
|
|
|
// we pay the rake fee to the dividend distribution account for the core asset, go ahead
|
|
// and look up that account now
|
|
fc::optional<account_id_type> rake_account_id;
|
|
const asset_object& core_asset_obj = asset_id_type(0)(*this);
|
|
if (core_asset_obj.dividend_data_id)
|
|
{
|
|
const asset_dividend_data_object& core_asset_dividend_data_obj = (*core_asset_obj.dividend_data_id)(*this);
|
|
rake_account_id = core_asset_dividend_data_obj.dividend_distribution_account;
|
|
}
|
|
|
|
// collecting bettors and their positions
|
|
std::map<account_id_type, std::vector<const betting_market_position_object*> > bettor_positions_map;
|
|
|
|
auto& betting_market_index = get_index_type<betting_market_object_index>().indices().get<by_betting_market_group_id>();
|
|
auto& position_index = get_index_type<betting_market_position_index>().indices().get<by_bettor_betting_market>();
|
|
auto betting_market_itr = betting_market_index.lower_bound(betting_market_group.id);
|
|
while (betting_market_itr != betting_market_index.end() && betting_market_itr->group_id == betting_market_group.id)
|
|
{
|
|
const betting_market_object& betting_market = *betting_market_itr;
|
|
++betting_market_itr;
|
|
cancel_all_unmatched_bets_on_betting_market(betting_market);
|
|
|
|
auto position_itr = position_index.lower_bound(std::make_tuple(betting_market.id));
|
|
|
|
while (position_itr != position_index.end() && position_itr->betting_market_id == betting_market.id)
|
|
{
|
|
const betting_market_position_object& position = *position_itr;
|
|
++position_itr;
|
|
|
|
bettor_positions_map[position.bettor_id].push_back(&position);
|
|
}
|
|
}
|
|
|
|
// walking through bettors' positions and collecting winings and fees respecting asset_id
|
|
for (const auto& bettor_positions_pair: bettor_positions_map)
|
|
{
|
|
uint16_t rake_fee_percentage = get_global_properties().parameters.betting_rake_fee_percentage;
|
|
share_type net_profits;
|
|
share_type payout_amounts;
|
|
share_type fees_collected;
|
|
account_id_type bettor_id = bettor_positions_pair.first;
|
|
const std::vector<const betting_market_position_object*>& bettor_positions = bettor_positions_pair.second;
|
|
|
|
for (const betting_market_position_object* position : bettor_positions)
|
|
{
|
|
betting_market_resolution_type resolution;
|
|
if (cancel)
|
|
resolution = betting_market_resolution_type::cancel;
|
|
else
|
|
{
|
|
// checked in evaluator, should never happen, see above
|
|
assert(resolutions.count(position->betting_market_id));
|
|
resolution = resolutions.at(position->betting_market_id);
|
|
}
|
|
|
|
switch (resolution)
|
|
{
|
|
case betting_market_resolution_type::win:
|
|
{
|
|
share_type total_payout = position->pay_if_payout_condition + position->pay_if_not_canceled;
|
|
payout_amounts += total_payout;
|
|
fees_collected += position->fees_collected;
|
|
net_profits += total_payout - position->pay_if_canceled;
|
|
break;
|
|
}
|
|
case betting_market_resolution_type::not_win:
|
|
{
|
|
share_type total_payout = position->pay_if_not_payout_condition + position->pay_if_not_canceled;
|
|
payout_amounts += total_payout;
|
|
fees_collected += position->fees_collected;
|
|
net_profits += total_payout - position->pay_if_canceled;
|
|
break;
|
|
}
|
|
case betting_market_resolution_type::cancel:
|
|
payout_amounts += position->pay_if_canceled + position->fees_collected;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
remove(*position);
|
|
}
|
|
|
|
// pay the fees to the dividend-distribution account if net profit
|
|
share_type rake_amount;
|
|
if (net_profits.value > 0 && rake_account_id)
|
|
{
|
|
rake_amount = ((fc::uint128_t(net_profits.value) * rake_fee_percentage + GRAPHENE_100_PERCENT - 1) / GRAPHENE_100_PERCENT).to_uint64();
|
|
if (rake_amount.value)
|
|
adjust_balance(*rake_account_id, asset(rake_amount, betting_market_group.asset_id));
|
|
}
|
|
|
|
if (fees_collected.value)
|
|
adjust_balance(*rake_account_id, asset(fees_collected, betting_market_group.asset_id));
|
|
|
|
// pay winning - rake
|
|
adjust_balance(bettor_id, asset(payout_amounts - rake_amount, betting_market_group.asset_id));
|
|
|
|
push_applied_operation(betting_market_group_resolved_operation(bettor_id,
|
|
betting_market_group.id,
|
|
resolutions,
|
|
payout_amounts,
|
|
fees_collected));
|
|
}
|
|
|
|
betting_market_itr = betting_market_index.lower_bound(betting_market_group.id);
|
|
while (betting_market_itr != betting_market_index.end() && betting_market_itr->group_id == betting_market_group.id)
|
|
{
|
|
const betting_market_object& betting_market = *betting_market_itr;
|
|
++betting_market_itr;
|
|
if (!do_not_remove)
|
|
remove(betting_market);
|
|
}
|
|
if (!do_not_remove)
|
|
remove(betting_market_group);
|
|
}
|
|
|
|
#if 0
|
|
void database::get_required_deposit_for_bet(const betting_market_object& betting_market,
|
|
betting_market_resolution_type resolution)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
bool maybe_cull_small_bet( database& db, const bet_object& bet_object_to_cull )
|
|
{
|
|
/**
|
|
* There are times when this bet can't be matched (for example, it's now laying a 2:1 bet for
|
|
* 1 satoshi, so it could only be matched by half a satoshi). Remove these bets from
|
|
* the books.
|
|
*/
|
|
|
|
if( bet_object_to_cull.get_matching_amount() == 0 )
|
|
{
|
|
ilog("applied epsilon logic");
|
|
db.cancel_bet(bet_object_to_cull);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
share_type adjust_betting_position(database& db, account_id_type bettor_id, betting_market_id_type betting_market_id, bet_type back_or_lay, share_type bet_amount, share_type matched_amount, share_type fees_collected)
|
|
{ try {
|
|
assert(bet_amount >= 0);
|
|
|
|
share_type guaranteed_winnings_returned = 0;
|
|
|
|
if (bet_amount == 0)
|
|
return guaranteed_winnings_returned;
|
|
|
|
auto& index = db.get_index_type<betting_market_position_index>().indices().get<by_bettor_betting_market>();
|
|
auto itr = index.find(boost::make_tuple(bettor_id, betting_market_id));
|
|
if (itr == index.end())
|
|
{
|
|
db.create<betting_market_position_object>([&](betting_market_position_object& position) {
|
|
position.bettor_id = bettor_id;
|
|
position.betting_market_id = betting_market_id;
|
|
position.pay_if_payout_condition = back_or_lay == bet_type::back ? bet_amount + matched_amount : 0;
|
|
position.pay_if_not_payout_condition = back_or_lay == bet_type::lay ? bet_amount + matched_amount : 0;
|
|
position.pay_if_canceled = bet_amount;
|
|
position.pay_if_not_canceled = 0;
|
|
position.fees_collected = fees_collected;
|
|
// this should not be reducible
|
|
});
|
|
} else {
|
|
db.modify(*itr, [&](betting_market_position_object& position) {
|
|
assert(position.bettor_id == bettor_id);
|
|
assert(position.betting_market_id == betting_market_id);
|
|
position.pay_if_payout_condition += back_or_lay == bet_type::back ? bet_amount + matched_amount : 0;
|
|
position.pay_if_not_payout_condition += back_or_lay == bet_type::lay ? bet_amount + matched_amount : 0;
|
|
position.pay_if_canceled += bet_amount;
|
|
position.fees_collected += fees_collected;
|
|
|
|
guaranteed_winnings_returned = position.reduce();
|
|
});
|
|
}
|
|
return guaranteed_winnings_returned;
|
|
} FC_CAPTURE_AND_RETHROW((bettor_id)(betting_market_id)(bet_amount)) }
|
|
|
|
|
|
// called twice when a bet is matched, once for the taker, once for the maker
|
|
bool bet_was_matched(database& db, const bet_object& bet,
|
|
share_type amount_bet, share_type amount_matched,
|
|
bet_multiplier_type actual_multiplier, bool cull_if_small)
|
|
{
|
|
// calculate the percentage fee paid
|
|
fc::uint128_t percentage_fee_128 = bet.amount_reserved_for_fees.value;
|
|
percentage_fee_128 *= amount_bet.value;
|
|
percentage_fee_128 += bet.amount_to_bet.amount.value - 1;
|
|
percentage_fee_128 /= bet.amount_to_bet.amount.value;
|
|
share_type fee_paid = percentage_fee_128.to_uint64();
|
|
|
|
// record their bet, modifying their position, and return any winnings
|
|
share_type guaranteed_winnings_returned = adjust_betting_position(db, bet.bettor_id, bet.betting_market_id,
|
|
bet.back_or_lay, amount_bet, amount_matched, fee_paid);
|
|
db.adjust_balance(bet.bettor_id, asset(guaranteed_winnings_returned, bet.amount_to_bet.asset_id));
|
|
|
|
// generate a virtual "match" op
|
|
asset asset_amount_bet(amount_bet, bet.amount_to_bet.asset_id);
|
|
db.push_applied_operation(bet_matched_operation(bet.bettor_id, bet.id,
|
|
asset_amount_bet,
|
|
fee_paid,
|
|
actual_multiplier,
|
|
guaranteed_winnings_returned));
|
|
|
|
// update the bet on the books
|
|
if (asset_amount_bet == bet.amount_to_bet)
|
|
{
|
|
db.remove(bet);
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
db.modify(bet, [&](bet_object& bet_obj) {
|
|
bet_obj.amount_to_bet -= asset_amount_bet;
|
|
bet_obj.amount_reserved_for_fees -= fee_paid;
|
|
});
|
|
//TODO: cull_if_small is currently always true, remove the parameter if we don't find a
|
|
// need for it soon
|
|
if (cull_if_small)
|
|
return maybe_cull_small_bet(db, bet);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Matches the two orders,
|
|
*
|
|
* @return a bit field indicating which orders were filled (and thus removed)
|
|
*
|
|
* 0 - no bet was matched (this will never happen)
|
|
* 1 - taker_bet was filled and removed from the books
|
|
* 2 - maker_bet was filled and removed from the books
|
|
* 3 - both were filled and removed from the books
|
|
*/
|
|
int match_bet(database& db, const bet_object& taker_bet, const bet_object& maker_bet )
|
|
{
|
|
assert(taker_bet.amount_to_bet.asset_id == maker_bet.amount_to_bet.asset_id);
|
|
assert(taker_bet.amount_to_bet.amount > 0 && maker_bet.amount_to_bet.amount > 0);
|
|
assert(taker_bet.backer_multiplier >= maker_bet.backer_multiplier);
|
|
assert(taker_bet.back_or_lay != maker_bet.back_or_lay);
|
|
|
|
int result = 0;
|
|
share_type maximum_amount_to_match = taker_bet.get_matching_amount();
|
|
|
|
if (maximum_amount_to_match <= maker_bet.amount_to_bet.amount)
|
|
{
|
|
// we will consume the entire taker bet
|
|
result |= bet_was_matched(db, taker_bet, taker_bet.amount_to_bet.amount, maximum_amount_to_match, maker_bet.backer_multiplier, true);
|
|
result |= bet_was_matched(db, maker_bet, maximum_amount_to_match, taker_bet.amount_to_bet.amount, maker_bet.backer_multiplier, true) << 1;
|
|
}
|
|
else
|
|
{
|
|
// we will consume the entire maker bet. Figure out how much of the taker bet we can fill.
|
|
share_type taker_amount = maker_bet.get_matching_amount();
|
|
share_type maker_amount = bet_object::get_matching_amount(taker_amount, maker_bet.backer_multiplier, taker_bet.back_or_lay);
|
|
|
|
result |= bet_was_matched(db, taker_bet, taker_amount, maker_amount, maker_bet.backer_multiplier, true);
|
|
result |= bet_was_matched(db, maker_bet, maker_amount, taker_amount, maker_bet.backer_multiplier, true) << 1;
|
|
}
|
|
|
|
assert(result != 0);
|
|
return result;
|
|
}
|
|
|
|
bool database::place_bet(const bet_object& new_bet_object)
|
|
{
|
|
bet_id_type bet_id = new_bet_object.id;
|
|
const asset_object& bet_asset = get(new_bet_object.amount_to_bet.asset_id);
|
|
|
|
const auto& bet_odds_idx = get_index_type<bet_object_index>().indices().get<by_odds>();
|
|
|
|
bet_type bet_type_to_match = new_bet_object.back_or_lay == bet_type::back ? bet_type::lay : bet_type::back;
|
|
auto book_itr = bet_odds_idx.lower_bound(std::make_tuple(new_bet_object.betting_market_id, bet_type_to_match));
|
|
auto book_end = bet_odds_idx.upper_bound(std::make_tuple(new_bet_object.betting_market_id, bet_type_to_match, new_bet_object.backer_multiplier));
|
|
|
|
int orders_matched_flags = 0;
|
|
bool finished = false;
|
|
while (!finished && book_itr != book_end)
|
|
{
|
|
auto old_book_itr = book_itr;
|
|
++book_itr;
|
|
// match returns 2 when only the old order was fully filled. In this case, we keep matching; otherwise, we stop.
|
|
|
|
orders_matched_flags = match_bet(*this, new_bet_object, *old_book_itr);
|
|
finished = orders_matched_flags != 2;
|
|
}
|
|
|
|
return (orders_matched_flags & 1) != 0;
|
|
}
|
|
|
|
} }
|