Fix notifications broken with ZMQ driver

The notification message did not contain a method keyword,
so it was ignored by consumers. Another in dispatch, the
notification msg confilict with other method.

Change-Id: I7c60c6f80006222d3cbe818d32288d043b55a7b8
Closes-Bug:#1368154

oslo_messaging/_drivers/impl_zmq.py

@@ -302,9 +302,9 @@ class InternalContext(object):
         data.setdefault('args', {})
 
         try:
-            result = proxy.dispatch(
-                ctx, data['version'], data['method'],
-                data.get('namespace'), **data['args'])
+            if not data.get("method"):
+                raise KeyError
+            result = proxy.dispatch(ctx, data)
             return ConsumerBase.normalize_reply(result, ctx.replies)
         except greenlet.GreenletExit:
             # ignore these since they are just from shutdowns
@@ -368,18 +368,13 @@ class ConsumerBase(object):
         # Method starting with - are
         # processed internally. (non-valid method name)
         method = data.get('method')
-        if not method:
-            LOG.error(_("RPC message did not include method."))
-            return
-
         # Internal method
         # uses internal context for safety.
         if method == '-reply':
             self.private_ctx.reply(ctx, proxy, **data['args'])
             return
 
-        proxy.dispatch(ctx, data['version'],
-                       data['method'], data.get('namespace'), **data['args'])
+        proxy.dispatch(ctx, data)
 
 
 class ZmqBaseReactor(ConsumerBase):
@@ -834,16 +829,7 @@ class ZmqListener(base.Listener):
         super(ZmqListener, self).__init__(driver)
         self.incoming_queue = moves.queue.Queue()
 
-    def dispatch(self, ctxt, version, method, namespace, **kwargs):
-        message = {
-            'method': method,
-            'args': kwargs
-        }
-        if version:
-            message['version'] = version
-        if namespace:
-            message['namespace'] = namespace
-
+    def dispatch(self, ctxt, message):
         incoming = ZmqIncomingMessage(self,
                                       ctxt.to_dict(),
                                       message)

oslo_messaging/tests/drivers/test_impl_zmq.py

@@ -416,8 +416,9 @@ class TestZmqListener(test_utils.BaseTestCase):
         kwargs = {'a': 1, 'b': 2}
         m = mock.Mock()
         ctxt = mock.Mock(autospec=impl_zmq.RpcContext)
-        eventlet.spawn_n(listener.dispatch, ctxt, 0,
-                         m.fake_method, 'name.space', **kwargs)
+        message = {'namespace': 'name.space', 'method': m.fake_method,
+                   'args': kwargs}
+        eventlet.spawn_n(listener.dispatch, ctxt, message)
         resp = listener.poll(timeout=10)
         msg = {'method': m.fake_method, 'namespace': 'name.space',
                'args': kwargs}