Mark memcache and memcache_pool token deprecated

Mark the memcache and memcache_pool token persistence backends
deprecated in favor of using the fernet token (no-persistence
needed) backend.

This is only deprecating the token persistence backends and does
not affect the cache layer.

implements bp deprecated-as-of-mitaka

Change-Id: I552774f95bc246f7f013350f5b11ae4ae482bdc5

keystone/token/persistence/backends/memcache.py

@@ -14,6 +14,7 @@
 # under the License.
 
 from oslo_config import cfg
+from oslo_log import versionutils
 
 from keystone.token.persistence.backends import kvs
 
@@ -25,6 +26,11 @@ class Token(kvs.Token):
     kvs_backend = 'openstack.kvs.Memcached'
     memcached_backend = 'memcached'
 
+    @versionutils.deprecated(
+        what='Memcache Token Persistence Driver',
+        as_of=versionutils.deprecated.MITAKA,
+        in_favor_of='fernet token driver (no-persistence)',
+        remove_in=0)
     def __init__(self, *args, **kwargs):
         kwargs['memcached_backend'] = self.memcached_backend
         kwargs['no_expiry_keys'] = [self.revocation_key]

keystone/token/persistence/backends/memcache_pool.py

@@ -11,6 +11,7 @@
 # under the License.
 
 from oslo_config import cfg
+from oslo_log import versionutils
 
 from keystone.token.persistence.backends import memcache
 
@@ -21,6 +22,11 @@ CONF = cfg.CONF
 class Token(memcache.Token):
     memcached_backend = 'pooled_memcached'
 
+    @versionutils.deprecated(
+        what='Memcache Pool Token Persistence Driver',
+        as_of=versionutils.deprecated.MITAKA,
+        in_favor_of='fernet token driver (no-persistence)',
+        remove_in=0)
     def __init__(self, *args, **kwargs):
         for arg in ('dead_retry', 'socket_timeout', 'pool_maxsize',
                     'pool_unused_timeout', 'pool_connection_get_timeout'):

releasenotes/notes/deprecate-memcache-token-persistence-eac88c80147ea241.yaml

@@ -0,0 +1,7 @@
+---
+deprecations:
+  - >
+    [`blueprint deprecated-as-of-mitaka <https://blueprints.launchpad.net/keystone/+spec/deprecated-as-of-mitaka>`_]
+    The token memcache and memcache_pool persistence
+    backends have been deprecated in favor of using
+    Fernet tokens (which require no persistence).