def test_get_current_xratescom_exchange_rates():
rates_map = get_current_xratescom_exchange_rates(A_USD)
for asset, price in rates_map.items():
assert asset.is_fiat()
assert price is not None and price > ZERO
rates_map = get_current_xratescom_exchange_rates(A_CNY)
for asset, price in rates_map.items():
assert asset.is_fiat()
assert price is not None and price > ZERO
def _query_fiat_pair(base: Asset, quote: Asset) -> Price:
"""Queries the current price between two fiat assets
If a current price is not found but a cached price within 30 days is found
then that one is used.
May raise RemoteError if a price can not be found
"""
if base == quote:
return Price(FVal('1'))
now = ts_now()
# Check cache for a price within the last 24 hrs
price_cache_entry = GlobalDBHandler().get_historical_price(
from_asset=base,
to_asset=quote,
timestamp=now,
max_seconds_distance=DAY_IN_SECONDS,
)
if price_cache_entry:
return price_cache_entry.price
# Use the xratescom query and save all prices in the cache
price = None
try:
price_map = get_current_xratescom_exchange_rates(base)
for quote_asset, quote_price in price_map.items():
if quote_asset == quote:
# if the quote asset price is found return it
price = quote_price
GlobalDBHandler().add_historical_prices(entries=[
HistoricalPrice(
from_asset=base,
to_asset=quote_asset,
source=HistoricalPriceOracle.XRATESCOM,
timestamp=timestamp_to_daystart_timestamp(now),
price=quote_price,
)
])
if price: # the quote asset may not be found
return price
except RemoteError:
pass # price remains None
# query backup api
price = _query_currency_converterapi(base, quote)
if price is not None:
return price
# Check cache
price_cache_entry = GlobalDBHandler().get_historical_price(
from_asset=base,
to_asset=quote,
timestamp=now,
max_seconds_distance=MONTH_IN_SECONDS,
)
if price_cache_entry:
log.debug(
f'Could not query online apis for a fiat price. '
f'Used cached value from '
f'{(now - price_cache_entry.timestamp) / DAY_IN_SECONDS} days ago.',
base_currency=base.identifier,
quote_currency=quote.identifier,
price=price_cache_entry.price,
)
return price_cache_entry.price
# else
raise RemoteError(
f'Could not find a current {base.identifier} price for {quote.identifier}',
)