Update examples for RPC

examples/example_server.py

@@ -0,0 +1,39 @@
+import capnp
+import test_capnp
+
+import socket
+import traceback
+
+class Server:
+    def __init__(self, val=1):
+        self.val = val
+
+    def foo(self, context):
+        context.results.x = str(context.params.i * 5 + self.val)
+
+def restore(ref_id):
+    return test_capnp.TestInterface.new_server(Server(100))
+
+def example_server(host='localhost', port=49999):
+    backlog = 1 
+
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
+    s.bind((host,port)) 
+    s.listen(backlog) 
+
+    loop = capnp.EventLoop()
+    while 1:
+        try:
+            (clientsocket, address) = s.accept()
+            stream = capnp.FdAsyncIoStream(clientsocket.fileno())
+            restorer = capnp.Restorer(test_capnp.TestSturdyRefObjectId, restore)
+            server = capnp.RpcServer(loop, stream, restorer)
+
+            waiter = capnp.PromiseFulfillerPair()
+            loop.wait(waiter)
+        except KeyboardInterrupt:
+            break
+        except:
+            traceback.print_exc()
+
+example_server()