def create_order(
user_id: int,
direction: Direction,
amount: int,
base_currency: Currencies,
quote_currency: Currencies,
) -> Order:
expiration_time = datetime.utcnow() + timedelta(minutes=10)
conversion_rate = get_rate(
base_currency=Currency(base_currency),
quote_currency=Currency(quote_currency),
)
request_amount = Amount().deserialize(amount)
exchange_amount = request_amount * conversion_rate
order_type = OrderType.Trade
if CurrencyPair.is_diem_to_diem(
CurrencyPair(Currency(base_currency), Currency(quote_currency))):
order_type = OrderType.DirectConvert
return storage.create_order(
user_id=user_id,
amount=request_amount.serialize(),
direction=direction,
base_currency=base_currency.value,
quote_currency=quote_currency.value,
expiration_time=expiration_time,
exchange_amount=exchange_amount.serialize(),
order_type=order_type.value,
)
def _get_rates() -> Dict[str, Amount]:
rates = {}
for base_currency in DiemCurrency.__members__:
for fiat_currency in FiatCurrency.__members__:
try:
rate = get_rate(
base_currency=Currency(base_currency),
quote_currency=Currency(fiat_currency),
)
rates[f"{base_currency}_{fiat_currency}"] = rate
except LookupError:
pass
return rates
def test_get_rate_direct_conversion_odd_currencies():
rate = get_rate(Currency.EUR, Currency.Coin1).serialize()
assert rate == 1080000
def test_get_rate_non_exist_conversion():
with pytest.raises(LookupError):
get_rate(Currency.CHF, Currency.NZD).serialize()
def test_get_rate_direct_conversion_matching_currencies():
rate = get_rate(Currency.Coin1, Currency.USD).serialize()
assert rate == 1000000