Create currency exchange rate module

.gitignore

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+__pycache__/
+*.pyc

helpers.py

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+from core.classes.http import HTTP
+from core.models.local import Currency
+
+import json
+
+from logging import getLogger
+from decimal import Decimal
+
+logger = getLogger(__name__)
+
+def update_currencies(currencies=[]):
+    data = HTTP("https://api.ratesapi.io/api/latest").data
+    loaded = json.loads(data)
+    base = Currency.get_base().code
+
+    if (not base == loaded["base"]) and (not base in loaded["rates"].keys()):
+        raise ValueError(f"Base currency {base} not supported.")
+
+    rates = {loaded["base"]: Decimal(1 if base == loaded["base"] else loaded["rates"][base])}
+
+    for currency, rate in loaded["rates"].items():
+        rates[currency] = Decimal(1) if base == currency else rates[loaded["base"]] / Decimal(rate)
+
+    for currency in Currency.objects.all():
+        if (not currencies) or (currency.code in currencies):
+            if currency.code in rates.keys():
+                currency.rate = rates[currency.code]
+                currency.save()
+                logger.info(f"Updated exchange rate for {currency.code}")
+            else:
+                logger.warn(f"Unable to set exchange rate for {currency.code} - currency not supported.")
+    

management/commands/updateforex.py

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+from django.core.management.base import BaseCommand, CommandError
+
+from ratesapi.helpers import update_currencies
+
+class Command(BaseCommand):
+    help = 'Updates exchange rates for all supported currencies'
+
+    def handle(self, *args, **options):
+        update_currencies()