Isolate token caching into its own region

This will make it so that when we have to invalidate the entire token cache we
don't have to invalidate *everything* in the default region.

Change-Id: I4ee419c01cad610f14460752a13ade83234b1b42

keystone/server/backends.py

@@ -41,6 +41,7 @@ def load_backends():
     cache.configure_cache(region=revoke.REVOKE_REGION)
     cache.apply_invalidation_patch(region=revoke.REVOKE_REGION,
                                    region_name=revoke.REVOKE_REGION.name)
+    cache.configure_cache(region=token.provider.TOKENS_REGION)
 
     # Ensure that the identity driver is created before the assignment manager
     # and that the assignment driver is created before the resource manager.

keystone/token/provider.py

@@ -20,6 +20,7 @@ import datetime
 import sys
 import uuid
 
+from oslo_cache import core as oslo_cache
 from oslo_log import log
 from oslo_utils import timeutils
 import six
@@ -39,7 +40,11 @@ from keystone.token import utils
 
 CONF = keystone.conf.CONF
 LOG = log.getLogger(__name__)
-MEMOIZE = cache.get_memoization_decorator(group='token')
+
+TOKENS_REGION = oslo_cache.create_region()
+MEMOIZE_TOKENS = cache.get_memoization_decorator(
+    group='token',
+    region=TOKENS_REGION)
 
 # NOTE(morganfainberg): This is for compatibility in case someone was relying
 # on the old location of the UnsupportedTokenVersionException for their code.
@@ -287,11 +292,11 @@ class Manager(manager.Manager):
             LOG.debug('Unable to validate token: %s', e)
             raise exception.TokenNotFound(token_id=token_id)
 
-    @MEMOIZE
+    @MEMOIZE_TOKENS
     def validate_non_persistent_token(self, token_id):
         return self.driver.validate_non_persistent_token(token_id)
 
-    @MEMOIZE
+    @MEMOIZE_TOKENS
     def _validate_token(self, token_id):
         if not token_id:
             raise exception.TokenNotFound(_('No token in the request'))
@@ -312,11 +317,11 @@ class Manager(manager.Manager):
             return self.driver.validate_v2_token(token_ref)
         raise exception.UnsupportedTokenVersionException()
 
-    @MEMOIZE
+    @MEMOIZE_TOKENS
     def _validate_v2_token(self, token_id):
         return self.driver.validate_v2_token(token_id)
 
-    @MEMOIZE
+    @MEMOIZE_TOKENS
     def _validate_v3_token(self, token_id):
         return self.driver.validate_v3_token(token_id)