caches: introduce invalidation as a safer ways to expire keys, deleting them are more problematic.

rhodecode/apps/_base/subscribers.py

@@ -41,13 +41,14 b' def trigger_user_permission_flush(event)'
     automatic flush of permission caches, so the users affected receive new permissions
     Right Away
     """
-
+    invalidate = True
     affected_user_ids = set(event.user_ids)
     for user_id in affected_user_ids:
         for cache_namespace_uid_tmpl in cache_namespaces:
             cache_namespace_uid = cache_namespace_uid_tmpl.format(user_id)
-            del_keys = rc_cache.clear_cache_namespace('cache_perms', cache_namespace_uid)
-            log.debug('Deleted %s cache keys for user_id: %s and namespace %s',
+            del_keys = rc_cache.clear_cache_namespace(
+                'cache_perms', cache_namespace_uid, invalidate=invalidate)
+            log.debug('Invalidated %s cache keys for user_id: %s and namespace %s',
                       del_keys, user_id, cache_namespace_uid)
 
 

rhodecode/lib/rc_cache/utils.py

@@ -261,10 +261,13 b' def get_or_create_region(region_name, re'
     return region_obj
 
 
-def clear_cache_namespace(cache_region, cache_namespace_uid):
+def clear_cache_namespace(cache_region, cache_namespace_uid, invalidate=False):
     region = get_or_create_region(cache_region, cache_namespace_uid)
     cache_keys = region.backend.list_keys(prefix=cache_namespace_uid)
     num_delete_keys = len(cache_keys)
+    if invalidate:
+        region.invalidate(hard=False)
+    else:
     if num_delete_keys:
         region.delete_multi(cache_keys)
     return num_delete_keys

rhodecode/model/scm.py

@@ -285,7 +285,8 b' class ScmModel(BaseModel):'
             repo.update_commit_cache(config=config, cs_cache=None)
             if delete:
                 cache_namespace_uid = 'cache_repo.{}'.format(repo_id)
-                rc_cache.clear_cache_namespace('cache_repo', cache_namespace_uid)
+                rc_cache.clear_cache_namespace(
+                    'cache_repo', cache_namespace_uid, invalidate=True)
 
     def toggle_following_repo(self, follow_repo_id, user_id):