def order_placed(self, ord):
"Handles creation of orders. "
assert (not ord.is_processed())
acc = ord.account
order_ev_pos = ord.group_by_event()
# get the cost for completing the order
cost = sum([self.eval_cost(ev, ps) for (ev,ps) in order_ev_pos])
logger.debug("Order '%s' total sum: %f" % (ord, cost))
# see if the order can be completed
ord.is_successful = (acc.funds >= cost)
if ord.is_successful:
# update the market maker amounts
MarketBalance.accept_order(ord)
# update the account amounts
AccountBalance.accept_order(ord)
# deduct the total transaction cost from the account
acc.funds -= cost
# update buy/sell prices
for (ev, ps) in order_ev_pos:
self.update_prices(ev)
ord.set_processed()
acc.save()
ord.save()
logger.debug("Order '%s' processed!" % (ord,))
def end_challenge(self, datum):
"""
Finalises a challenge given the current datum.
Treats the amounts in AccountBalance and MarketBalance as the number of shares owned for each Outcome.
Rewards all players holding shares for winning outcomes (i.e. Results) with 1 credit, or substracts money in the case they have negative.
Iterates through all events in this market, gets the Result of the event, and rewards all players with a non-neutral position in the outcome
with 1 credit for each share they possess. Finally, resets the market state.
"""
mkt = datum.data_set.market
for ev in mkt.events.all():
# get the event result
try:
result = Result.objects.get(datum=datum, outcome__event=ev)
except:
# if it does not exist, print a warning
logger.warn("Datum %s from DatSet %s does not define a result for event %s. "
% (datum, datum.dataset, ev))
else:
# if it was found, reward the winners (and penalise the losers)
for accShares in result.outcome.accountbalance_set.all():
if accShares.amount != 0:
acc = accShares.account
acc.funds += accShares.amount
acc.save()
logger.debug("Rewarded user %s with %d credits. " % (acc.user, accShares.amount))
# reset all account and market amounts for this event
self.reset_event(ev)
def price_quote(self, ord):
"""Gets the estimated price for the given order. """
ps = ord.group_by_event()
cost = sum([self.eval_cost(ev, ps) for (ev,ps) in order_ev_pos])
logger.debug("Order '%s' quote: %f" % (ord, cost))
return cost
