Update caching configuration to use Redis if available, fallback to local memory cache otherwise

Author: OutboundSpade

config/settings/production.py

@@ -23,18 +23,28 @@
 
 # CACHES
 # ------------------------------------------------------------------------------
-CACHES = {
-    "default": {
-        "BACKEND": "django_redis.cache.RedisCache",
-        "LOCATION": env("REDIS_URL"),
-        "OPTIONS": {
-            "CLIENT_CLASS": "django_redis.client.DefaultClient",
-            # Mimicing memcache behavior.
-            # https://github.com/jazzband/django-redis#memcached-exceptions-behavior
-            "IGNORE_EXCEPTIONS": True,
-        },
+REDIS_URL = env("REDIS_URL", default="")
+
+if REDIS_URL:
+    CACHES = {
+        "default": {
+            "BACKEND": "django_redis.cache.RedisCache",
+            "LOCATION": REDIS_URL,
+            "OPTIONS": {
+                "CLIENT_CLASS": "django_redis.client.DefaultClient",
+                # Mimicing memcache behavior.
+                # https://github.com/jazzband/django-redis#memcached-exceptions-behavior
+                "IGNORE_EXCEPTIONS": True,
+            },
+        }
+    }
+else:
+    CACHES = {
+        "default": {
+            "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
+            "LOCATION": "",
+        }
     }
-}
 
 # SECURITY
 # ------------------------------------------------------------------------------