Use memcache to store consoleauth tokens

 * Rather than store tokens in a dict, use memorycache
   so that deployers can optionally use memcached if they
   would like to run multile nova-consoleauth processes
 * Fixes bug 989337

Change-Id: I96ec4d796e53b69a494d856269e3c4e8f9b3d222

nova/consoleauth/manager.py

@@ -24,7 +24,7 @@
 from nova import log as logging
 from nova import manager
 from nova.openstack.common import cfg
-from nova import utils
+from nova.openstack.common import jsonutils
 
 
 LOG = logging.getLogger(__name__)
@@ -49,33 +49,29 @@ class ConsoleAuthManager(manager.Manager):
 
     def __init__(self, scheduler_driver=None, *args, **kwargs):
         super(ConsoleAuthManager, self).__init__(*args, **kwargs)
-        self.tokens = {}
-        utils.LoopingCall(self._delete_expired_tokens).start(1)
 
-    def _delete_expired_tokens(self):
-        now = time.time()
-        to_delete = []
-        for k, v in self.tokens.items():
-            if now - v['last_activity_at'] > FLAGS.console_token_ttl:
-                to_delete.append(k)
-
-        for k in to_delete:
-            LOG.audit(_("Deleting Expired Token: (%s)"), k)
-            del self.tokens[k]
+        if FLAGS.memcached_servers:
+            import memcache
+        else:
+            from nova.common import memorycache as memcache
+        self.mc = memcache.Client(FLAGS.memcached_servers,
+                                  debug=0)
 
     def authorize_console(self, context, token, console_type, host, port,
                           internal_access_path):
-        self.tokens[token] = {'token': token,
-                              'console_type': console_type,
-                              'host': host,
-                              'port': port,
-                              'internal_access_path': internal_access_path,
-                              'last_activity_at': time.time()}
-        token_dict = self.tokens[token]
+        token_dict = {'token': token,
+                      'console_type': console_type,
+                      'host': host,
+                      'port': port,
+                      'internal_access_path': internal_access_path,
+                      'last_activity_at': time.time()}
+        data = jsonutils.dumps(token_dict)
+        self.mc.set(token, data, FLAGS.console_token_ttl)
         LOG.audit(_("Received Token: %(token)s, %(token_dict)s)"), locals())
 
     def check_token(self, context, token):
-        token_valid = token in self.tokens
+        token_str = self.mc.get(token)
+        token_valid = (token_str != None)
         LOG.audit(_("Checking Token: %(token)s, %(token_valid)s)"), locals())
         if token_valid:
-            return self.tokens[token]
+            return jsonutils.loads(token_str)