85 lines
2.4 KiB
Python
85 lines
2.4 KiB
Python
import datetime
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import os
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from abc import ABC, abstractmethod
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from decimal import Decimal
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from money.currency import Currency, CurrencyHelper
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from money.money import Money
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from xecd_rates_client import XecdClient
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from xexe.exchange_rates import ExchangeRate
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class RateFetcher(ABC):
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is_production_grade = False
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@abstractmethod
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def fetch_rate(
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self, from_currency: Currency, to_currency: Currency, rate_date: datetime.date
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) -> ExchangeRate:
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pass
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class MockRateFetcher(RateFetcher):
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is_production_grade = False
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def __init__(self) -> None:
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super().__init__()
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def fetch_rate(
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self, from_currency: Currency, to_currency: Currency, rate_date: datetime.date
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) -> ExchangeRate:
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return ExchangeRate(
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from_currency=from_currency,
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to_currency=to_currency,
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rate=Money(42, to_currency),
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rate_date=rate_date,
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)
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class XERateFetcher(RateFetcher):
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is_production_grade = True
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def __init__(self) -> None:
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super().__init__()
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self.xe_client = XecdClient(
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account_id=os.environ["XE_ACCOUNT_ID"],
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api_key=os.environ["XE_API_KEY"],
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)
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def fetch_rate(
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self, from_currency: Currency, to_currency: Currency, rate_date: datetime.date
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) -> ExchangeRate:
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response = self.xe_client.historic_rate(
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rate_date.strftime("%Y-%m-%d"),
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"12:00",
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from_currency.value, # .value will access the ISO 4217 str code of the currency
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to_currency.value,
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1,
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# always 1, because the rate we want is how much of to_curr does
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# 1 unit of from_curr get us.
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)
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from_currency = Currency(response["from"])
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to_currency = Currency(response["to"][0]["quotecurrency"])
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rate_date = datetime.datetime.fromisoformat(
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response["timestamp"].replace(
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"Z", "+00:00"
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) # Funny replace is necessary because of API response format
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).date()
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rate = f"""{response["to"][0]["mid"]:.{CurrencyHelper.decimal_precision_for_currency(to_currency)}f}"""
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return ExchangeRate(
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from_currency=from_currency,
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to_currency=to_currency,
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rate_date=rate_date,
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rate=rate,
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)
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def build_rate_fetcher(rates_source: str, rate_sources_mapping):
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return rate_sources_mapping[rates_source]()
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