+ thread-safe cache for GlobalSettings

store/models.py

@@ -1,10 +1,8 @@
-import time
 from decimal import Decimal
-from datetime import datetime
 import random
 import string
-import uuid
 from io import BytesIO
+from threading import local as LocalContext
 
 from django.conf import settings
 from django.contrib.admin import display
@@ -23,7 +21,7 @@ from store.utils import create_preview, concat_not_null_values
 
 
 class GlobalSettings(models.Model):
-    cached = None
+    context = LocalContext()
 
     # currency
     yuan_rate = models.DecimalField('Курс CNY/RUB', max_digits=10, decimal_places=2, default=0)
@@ -40,18 +38,18 @@ class GlobalSettings(models.Model):
         # Store only one instance of GlobalSettings
         self.__class__.objects.exclude(id=self.id).delete()
         super().save(*args, **kwargs)
-        GlobalSettings.cached = self
+        GlobalSettings.context.cached = self
 
     def __str__(self) -> str:
         return f'GlobalSettings for {self.id}'
 
     @classmethod
     def load(cls) -> 'GlobalSettings':
-        if cls.cached is not None:
-            return cls.cached
+        if hasattr(cls.context, 'cached'):
+            return cls.context.cached
 
         obj, _ = cls.objects.get_or_create(id=1)
-        cls.cached = obj
+        cls.context.cached = obj
         return obj