def apply_exchange_buy():
order = BuyOrder()
bid = order
print(eoslib.n2s(bid.buyer.name))
eoslib.requireAuth(bid.buyer.name)
assert bid.quantity > 0, "invalid quantity"
assert bid.expiration > eoslib.now(), "order expired"
print(eoslib.n2s(bid.buyer.name), " created bid for ", order.quantity,
" currency at price: ", order.price, "\n")
buyer_account = Account(bid.buyer.name)
buyer_account.eos_balance -= bid.quantity
print('buyer_account:', buyer_account)
lowest_ask = Ask.front_by_price()
if not lowest_ask:
print("\n No asks found, saving buyer account and storing bid\n")
assert not order.fill_or_kill, "order not completely filled"
bid.store()
buyer_account.open_orders += 1
buyer_account.save()
return
print("ask: ", lowest_ask, "\n")
print("bid: ", bid, "\n")
seller_account = Account(lowest_ask.seller.name)
while lowest_ask.price <= bid.price:
print("lowest ask <= bid.price\n", lowest_ask.price, bid.price)
match(bid, buyer_account, lowest_ask, seller_account)
if lowest_ask.quantity == 0:
seller_account.open_orders -= 1
seller_account.save()
buyer_account.save()
lowest_ask.remove()
lowest_ask = Ask.front_by_price()
if not lowest_ask:
break
seller_account = Account(lowest_ask.seller.name)
else:
break
# buyer's bid should be filled
print("lowest_ask >= bid.price or buyer's bid has been filled\n")
if bid.quantity and not order.fill_or_kill:
buyer_account.open_orders += 1
buyer_account.save()
print("saving buyer's account\n")
if bid.quantity:
print(bid.quantity, " eos left over")
assert not order.fill_or_kill, "order not completely filled"
bid.store()
return
print("bid filled\n")
def apply_exchange_sell():
order = SellOrder()
ask = order
requireAuth(ask.seller.name)
assert ask.quantity > 0, "invalid quantity"
assert ask.expiration > now(), "order expired"
print("\n\n", eoslib.n2s(ask.seller.name), " created sell for ",
order.quantity, " currency at price: ", order.price, "\n")
existing_ask = Ask.load_by_order_id(ask.seller)
assert not existing_ask, "order with this id already exists"
seller_account = Account(ask.seller.name)
seller_account.currency_balance -= ask.quantity
highest_bid = Bid.back_by_price()
if not highest_bid:
assert not order.fill_or_kill, "order not completely filled"
print("\n No bids found, saving seller account and storing ask\n")
ask.store()
seller_account.open_orders += 1
seller_account.save()
return
print("\n bids found, lets see what matches\n")
buyer_account = Account(highest_bid.buyer.name)
while highest_bid.price >= ask.price:
match(highest_bid, buyer_account, ask, seller_account)
if highest_bid.quantity == 0:
buyer_account.open_orders -= 1
seller_account.save()
buyer_account.save()
highest_bid.remove()
highest_bid = Bid.back_by_price()
if not highest_bid:
break
buyer_account = Account(highest_bid.buyer.name)
else:
break
# buyer's bid should be filled
if ask.quantity and not order.fill_or_kill:
seller_account.open_orders += 1
seller_account.save()
if ask.quantity:
assert not order.fill_or_kill, "order not completely filled"
print("saving ask\n")
ask.store()
return
print("ask filled\n")
