use request response cache for license checks

awx/conf/license.py

@@ -8,7 +8,7 @@ from django.utils.translation import ugettext_lazy as _
 from rest_framework.exceptions import APIException
 
 # Tower
-from awx.main.utils.common import get_licenser
+from awx.main.utils.common import get_licenser, memoize
 
 __all__ = ['LicenseForbids', 'get_license', 'get_licensed_features',
            'feature_enabled', 'feature_exists']
@@ -40,6 +40,7 @@ def get_licensed_features():
     return features
 
 
+@memoize(cache_name='ephemeral')
 def feature_enabled(name):
     """Return True if the requested feature is enabled, False otherwise."""
     validated_license_data = _get_validated_license_data()

awx/main/utils/common.py

@@ -107,13 +107,14 @@ class RequireDebugTrueOrTest(logging.Filter):
         return settings.DEBUG or 'test' in sys.argv
 
 
-def memoize(ttl=60, cache_key=None):
+def memoize(ttl=60, cache_key=None, cache_name='default'):
     '''
     Decorator to wrap a function and cache its result.
     '''
-    from django.core.cache import cache
+    from django.core.cache import caches
 
     def _memoizer(f, *args, **kwargs):
+        cache = caches[cache_name]
         key = cache_key or slugify('%s %r %r' % (f.__name__, args, kwargs))
         value = cache.get(key)
         if value is None:

awx/settings/defaults.py

@@ -481,6 +481,9 @@ if is_testing():
         'default': {
             'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
         },
+        'ephemeral': {
+            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        },
     }
 else:
     CACHES = {
@@ -488,6 +491,9 @@ else:
             'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
             'LOCATION': 'memcached:11211',
         },
+        'ephemeral': {
+            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        },
     }
 
 # Social Auth configuration.