Add upcast/cast_as to DynamicCapability. Also changed EventLoop.

wait_remote -> wait

capnp/capnp.pyx

@@ -1163,7 +1163,7 @@ cdef class EventLoop:
         Py_INCREF(func)
         return Promise()._init(capnp.evalLater(self.thisptr, <PyObject *>func))
 
-    cpdef wait_remote(self, _RemotePromise promise) except +:
+    cpdef wait(self, _RemotePromise promise) except +:
         if promise.is_consumed:
             raise RuntimeError('Promise was already used in a consuming operation. You can no longer use this Promise object')
 
@@ -1263,6 +1263,28 @@ cdef class _DynamicCapabilityClient:
             return _partial(self._request, short_name)
         return _partial(self._send, name)
 
+    cpdef upcast(self, schema) except+:
+        cdef _InterfaceSchema s
+        if hasattr(schema, 'schema'):
+            s = schema.schema
+        else:
+            s = schema
+
+        return _DynamicCapabilityClient()._init(self.thisptr.upcast(s.thisptr), self._parent)
+
+    cpdef cast_as(self, schema) except+:
+        cdef _InterfaceSchema s
+        if hasattr(schema, 'schema'):
+            s = schema.schema
+        else:
+            s = schema
+        return _DynamicCapabilityClient()._init(self.thisptr.castAs(s.thisptr), self._parent)
+
+    property schema:
+        """A property that returns the _InterfaceSchema object matching this client"""
+        def __get__(self):
+            return _InterfaceSchema()._init(self.thisptr.getSchema())
+
 cdef class _CapabilityClient:
     cdef C_Capability.Client * thisptr
     cdef public object _parent

capnp/capnp_cpp.pxd

@@ -157,6 +157,7 @@ cdef extern from "capnp/dynamic.h" namespace " ::capnp":
             Client()
             Client(Client&)
             Client upcast(InterfaceSchema requestedSchema)
+            DynamicCapability.Client castAs"castAs< ::capnp::DynamicCapability>"(InterfaceSchema)
             InterfaceSchema getSchema()
             Request newRequest(char * methodName, uint firstSegmentWordSize)
 

examples/example_capability.py

@@ -30,7 +30,7 @@ def example_simple_rpc():
     cap = cap.cast_as(capability.TestInterface)
 
     remote = cap.foo(i=5)
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '125'
 

examples/example_client.py

@@ -18,7 +18,7 @@ def example_client():
     cap = cap.cast_as(test_capnp.TestInterface)
 
     remote = cap.foo(i=5)
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == 'foo'
 

test/test_capability.capnp

@@ -29,11 +29,9 @@ interface TestInterface {
   # baz @2 (s: TestAllTypes);
 }
 
-# interface TestExtends extends(TestInterface) {
-#   qux @0 ();
-#   corge @1 TestAllTypes -> ();
-#   grault @2 () -> TestAllTypes;
-# }
+interface TestExtends extends(TestInterface) {
+  qux @0 ();
+}
 
 interface TestPipeline {
   getCap @0 (n: UInt32, inCap :TestInterface) -> (s: Text, outBox :Box);

test/test_capability.py

@@ -32,7 +32,7 @@ def test_client(capability):
     req.i = 5
 
     remote = req.send()
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '26'
     
@@ -40,7 +40,7 @@ def test_client(capability):
     req.i = 5
 
     remote = req.send()
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '26'
 
@@ -63,13 +63,13 @@ def test_simple_client(capability):
     client = capability.TestInterface.new_client(Server(), loop)
     
     remote = client._send('foo', i=5)
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '26'
 
     
     remote = client.foo(i=5)
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '26'
 
@@ -93,10 +93,10 @@ def test_pipeline(capability):
     outCap = remote.outBox.cap
     pipelinePromise = outCap.foo(i=10)
 
-    response = loop.wait_remote(pipelinePromise)
+    response = loop.wait(pipelinePromise)
     assert response.x == '150'
 
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
     assert response.s == '26_foo'
 
 class BadServer:
@@ -114,7 +114,7 @@ def test_exception_client(capability):
     
     remote = client._send('foo', i=5)
     with pytest.raises(ValueError):
-        loop.wait_remote(remote)
+        loop.wait(remote)
 
 class BadPipelineServer:
     def getCap(self, context):
@@ -135,7 +135,7 @@ def test_exception_chain(capability):
     remote = client.getCap(n=5, inCap=foo_client)
 
     try:
-        loop.wait_remote(remote)
+        loop.wait(remote)
     except Exception as e:
         assert str(e) == 'test'
 
@@ -151,7 +151,17 @@ def test_pipeline_exception(capability):
     pipelinePromise = outCap.foo(i=10)
 
     with pytest.raises(Exception):
-        loop.wait_remote(pipelinePromise)
+        loop.wait(pipelinePromise)
 
     with pytest.raises(Exception):
-        loop.wait_remote(remote)
+        loop.wait(remote)
+
+def test_casting(capability):
+    loop = capnp.EventLoop()
+
+    client = capability.TestExtends.new_client(Server(), loop)
+    client2 = client.upcast(capability.TestInterface)
+    client3 = client2.cast_as(capability.TestInterface)
+
+    with pytest.raises(Exception):
+        client.upcast(capability.TestPipeline)

test/test_rpc.py

@@ -35,6 +35,6 @@ def test_simple_rpc(capability):
     cap = cap.cast_as(capability.TestInterface)
 
     remote = cap.foo(i=5)
-    response = loop.wait_remote(remote)
+    response = loop.wait(remote)
 
     assert response.x == '125'