Add can_send_version() to RpcProxy.

Add a helper method to the RpcProxy class.  This is a little nicer to
use for checking to see if a given message is copmatible with the set
version cap.

Change-Id: Ic44d76f4181351dff367f2d1181a3d508a11db78

2 files changed, 15 insertions, 0 deletions

diff --git a/openstack/common/rpc/proxy.py b/openstack/common/rpc/proxy.py
index 3b74fe1..8523421 100644
--- a/openstack/common/rpc/proxy.py
+++ b/openstack/common/rpc/proxy.py
@@ -76,6 +76,11 @@ class RpcProxy(object):
         """Return the topic to use for a message."""
         return topic if topic else self.topic
 
+    def can_send_version(self, version):
+        """Check to see if a version is compatible with the version cap."""
+        return (not self.version_cap or
+                rpc_common.version_is_compatible(self.version_cap, version))
+
     @staticmethod
     def make_namespaced_msg(method, namespace, **kwargs):
         return {'method': method, 'namespace': namespace, 'args': kwargs}
diff --git a/tests/unit/rpc/test_proxy.py b/tests/unit/rpc/test_proxy.py
index 9427cbe..9f67c83 100644
--- a/tests/unit/rpc/test_proxy.py
+++ b/tests/unit/rpc/test_proxy.py
@@ -209,3 +209,13 @@ class RpcProxyTestCase(utils.BaseTestCase):
         msg = rpc_proxy.make_msg('foo', a=1, b=2)
         result = rpc_proxy.call(ctxt, msg)
         self.assertEqual(result, 'worked!')
+
+    def test_can_send_version(self):
+        proxy_obj = proxy.RpcProxy('fake', '1.0', version_cap='1.5')
+        self.assertTrue(proxy_obj.can_send_version('1.5'))
+        self.assertFalse(proxy_obj.can_send_version('1.6'))
+
+    def test_can_send_version_with_no_cap(self):
+        proxy_obj = proxy.RpcProxy('fake', '1.0')
+        self.assertTrue(proxy_obj.can_send_version('1.5'))
+        self.assertTrue(proxy_obj.can_send_version('1.99'))