Ensure context type is handled when using to_dict

Handle the case where the context passed into def pack_context() is a
dictionary. If a dictionary is passed in, we don't need to call to_dict
before updating the msg.

fixes bug 1208971

Change-Id: I2ce0b28f97634e717868e0ee5525189338d4981c

openstack/common/rpc/amqp.py

@@ -300,8 +300,13 @@ def pack_context(msg, context):
     for args at some point.
 
     """
-    context_d = dict([('_context_%s' % key, value)
-                      for (key, value) in context.to_dict().iteritems()])
+    if isinstance(context, dict):
+        context_d = dict([('_context_%s' % key, value)
+                          for (key, value) in context.iteritems()])
+    else:
+        context_d = dict([('_context_%s' % key, value)
+                          for (key, value) in context.to_dict().iteritems()])
+
     msg.update(context_d)
 
 

tests/unit/rpc/amqp.py

@@ -22,6 +22,7 @@
 import logging
 
 from eventlet import greenthread
+import mock
 from oslo.config import cfg
 
 from openstack.common import jsonutils
@@ -177,3 +178,13 @@ def _callback(message):
         conn.close()
 
         self.assertTrue(self.exc_raised)
+
+    def test_context_dict_type_check(self):
+        """Test that context is handled properly depending on the type."""
+        fake_context = {'fake': 'context'}
+        mock_msg = mock.MagicMock()
+        rpc_amqp.pack_context(mock_msg, fake_context)
+
+        # assert first arg in args was a dict type
+        args = mock_msg.update.call_args[0]
+        self.assertIsInstance(args[0], dict)