Schedule a daily task to update currency information

InvenTree/InvenTree/apps.py

@@ -44,3 +44,8 @@ class InvenTreeConfig(AppConfig):
             schedule_type=Schedule.MINUTES,
             minutes=15
         )
+
+        InvenTree.tasks.schedule_task(
+            'InvenTree.tasks.update_exchange_rates',
+            schedule_type=Schedule.DAILY,
+        )

InvenTree/InvenTree/settings.py

@@ -513,7 +513,8 @@ CURRENCIES = CONFIG.get(
     ],
 )
 
-# TODO - Allow live web-based backends in the future
+BASE_CURRENCY = CONFIG.get('base_currency', 'USD')
+
 EXCHANGE_BACKEND = 'InvenTree.exchange.InvenTreeManualExchangeBackend'
 
 # Extract email settings from the config file

InvenTree/InvenTree/tasks.py

@@ -161,6 +161,34 @@ def check_for_updates():
     )
 
 
+def update_exchange_rates():
+    """
+    If an API key for fixer.io has been provided, attempt to update currency exchange rates
+    """
+
+    try:
+        import common.models
+        from django.conf import settings
+        from djmoney.contrib.exchange.backends import FixerBackend
+    except AppRegistryNotReady:
+        # Apps not yet loaded!
+        return
+
+    fixer_api_key = common.models.InvenTreeSetting.get_setting('INVENTREE_FIXER_API_KEY', '').strip()
+
+    if not fixer_api_key:
+        # API key not provided
+        return
+
+    backend = FixerBackend(access_key=fixer_api_key)
+
+    currencies = ','.join(settings.CURRENCIES)
+
+    base = settings.BASE_CURRENCY
+
+    result = backend.update_rates(base_currency=base, symbols=currencies)
+
+
 def send_email(subject, body, recipients, from_email=None):
     """
     Send an email with the specified subject and body,