Support RPC envelopes in impl_zmq

This patch began as a set
of tests verifying the functionality of
sending and receiving RPC envelopes when
using impl_zmq. It was discovered that
when enabled, RPC envelopes were not
actually working,

The ZeroMQ driver includes its own envelopes.
This patch introduce versioning to that
envelope, eliminating the previously reserved
'style' field.

A new iteration of the zeromq-envelope is
introduced, 'impl_zmq_v2'. It specifies
that the zeromq-envelope should be followed
by an unpacked array representing key value
pairs of the standard RPC Envelope.

Because the key-values of the RPC Envelope
can be successfully transformed with bytes(),
this prevents the need to double-serialize
the content traversing the message bus.

Also removes some unused imports.

Closes bug 1123709
Closes bug 1055446

Change-Id: Ib04e3d092c9596146f1048d3502ac248496d313b

1 files changed, 10 insertions, 2 deletions

diff --git a/tests/unit/rpc/test_zmq.py b/tests/unit/rpc/test_zmq.py
index 8c9a966..7a1e501 100644
--- a/tests/unit/rpc/test_zmq.py
+++ b/tests/unit/rpc/test_zmq.py
@@ -30,8 +30,7 @@ from oslo.config import cfg
 
 from openstack.common import exception
 from openstack.common.gettextutils import _
-from openstack.common import processutils
-from openstack.common import rpc
+from openstack.common.rpc import common as rpc_common
 from tests.unit.rpc import common
 
 try:
@@ -110,6 +109,15 @@ class RpcZmqBaseTopicTestCase(_RpcZmqBaseTestCase):
     pass
 
 
+class RpcZmqEnvelopeEnabledTestCase(_RpcZmqBaseTestCase):
+    """
+    This sends messages with envelopes enabled.
+    """
+    def setUp(self):
+        super(RpcZmqEnvelopeEnabledTestCase, self).setUp()
+        self.stubs.Set(rpc_common, '_SEND_RPC_ENVELOPE', True)
+
+
 class RpcZmqDirectTopicTestCase(_RpcZmqBaseTestCase):
     """
     Test communication directly to a host,