mojo: Add router for python bindings.

mojo/python/tests/messaging_unittest.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 
 # pylint: disable=F0401
 import mojo.embedder
 from mojo.bindings import messaging
 from mojo import system
 
 
-class _ForwardingMessageReceiver(messaging.MessageReceiver):
-
-  def __init__(self, callback):
-    self._callback = callback
-
-  def Accept(self, message):
-    self._callback(message)
-    return True
-
-
 class _ForwardingConnectionErrorHandler(messaging.ConnectionErrorHandler):
 
   def __init__(self, callback):
     self._callback = callback
 
   def OnError(self, result):
     self._callback(result)
 
 
-class MessagingTest(unittest.TestCase):
+class ConnectorTest(unittest.TestCase):
 
   def setUp(self):
     mojo.embedder.Init()
     self.loop = system.RunLoop()
     self.received_messages = []
     self.received_errors = []
     def _OnMessage(message):
       self.received_messages.append(message)
+      return True
     def _OnError(result):
       self.received_errors.append(result)
     handles = system.MessagePipe()
     self.connector = messaging.Connector(handles.handle1)
     self.connector.SetIncomingMessageReceiver(
-        _ForwardingMessageReceiver(_OnMessage))
+        messaging.ForwardingMessageReceiver(_OnMessage))
     self.connector.SetErrorHandler(
         _ForwardingConnectionErrorHandler(_OnError))
     self.connector.Start()
     self.handle = handles.handle0
 
 
   def tearDown(self):
     self.connector = None
     self.handle = None
     self.loop = None
@@ skipping 15 matching lines @@
     self.loop.RunUntilIdle()
     self.assertFalse(self.received_messages)
     self.assertTrue(self.received_errors)
     self.assertEquals(self.received_errors[0],
                       system.RESULT_FAILED_PRECONDITION)
 
   def testConnectorDeleteConnector(self):
     self.connector = None
     (result, _, _) = self.handle.ReadMessage()
     self.assertEquals(result, system.RESULT_FAILED_PRECONDITION)
+
+
+class HeaderTest(unittest.TestCase):
+
+  def testSimpleMessageHeader(self):
+    header = messaging.MessageHeader(0xdeadbeaf, messaging.NO_FLAG)
+    self.assertEqual(header.message_type, 0xdeadbeaf)
+    self.assertFalse(header.has_request_id)
+    self.assertFalse(header.expects_response)
+    self.assertFalse(header.is_response)
+    data = header.Serialize()
+    other_header = messaging.MessageHeader.Deserialize(data)
+    self.assertEqual(other_header.message_type, 0xdeadbeaf)
+    self.assertFalse(other_header.has_request_id)
+    self.assertFalse(other_header.expects_response)
+    self.assertFalse(other_header.is_response)
+
+  def testMessageHeaderWithRequestID(self):
+    # Request message.
+    header = messaging.MessageHeader(0xdeadbeaf,
+                                     messaging.MESSAGE_EXPECTS_RESPONSE_FLAG)
+
+    self.assertEqual(header.message_type, 0xdeadbeaf)
+    self.assertTrue(header.has_request_id)
+    self.assertTrue(header.expects_response)
+    self.assertFalse(header.is_response)
+    self.assertEqual(header.request_id, 0)
+
+    data = header.Serialize()
+    other_header = messaging.MessageHeader.Deserialize(data)
+
+    self.assertEqual(other_header.message_type, 0xdeadbeaf)
+    self.assertTrue(other_header.has_request_id)
+    self.assertTrue(other_header.expects_response)
+    self.assertFalse(other_header.is_response)
+    self.assertEqual(other_header.request_id, 0)
+
+    header.request_id = 0xdeadbeafdeadbeaf
+    data = header.Serialize()
+    other_header = messaging.MessageHeader.Deserialize(data)
+
+    self.assertEqual(other_header.request_id, 0xdeadbeafdeadbeaf)
+
+    # Response message.
+    header = messaging.MessageHeader(0xdeadbeaf,
+                                     messaging.MESSAGE_IS_RESPONSE_FLAG,
+                                     0xdeadbeafdeadbeaf)
+
+    self.assertEqual(header.message_type, 0xdeadbeaf)
+    self.assertTrue(header.has_request_id)
+    self.assertFalse(header.expects_response)
+    self.assertTrue(header.is_response)
+    self.assertEqual(header.request_id, 0xdeadbeafdeadbeaf)
+
+    data = header.Serialize()
+    other_header = messaging.MessageHeader.Deserialize(data)
+
+    self.assertEqual(other_header.message_type, 0xdeadbeaf)
+    self.assertTrue(other_header.has_request_id)
+    self.assertFalse(other_header.expects_response)
+    self.assertTrue(other_header.is_response)
+    self.assertEqual(other_header.request_id, 0xdeadbeafdeadbeaf)
+
+
+class RouterTest(unittest.TestCase):
+
+  def setUp(self):
+    mojo.embedder.Init()
+    self.loop = system.RunLoop()
+    self.received_messages = []
+    self.received_errors = []
+    def _OnMessage(message):
+      self.received_messages.append(message)
+      return True
+    def _OnError(result):
+      self.received_errors.append(result)
+    handles = system.MessagePipe()
+    self.router = messaging.Router(handles.handle1)
+    self.router.SetIncomingMessageReceiver(
+        messaging.ForwardingMessageReceiver(_OnMessage))
+    self.router.SetErrorHandler(
+        _ForwardingConnectionErrorHandler(_OnError))
+    self.router.Start()
+    self.handle = handles.handle0
+
+  def tearDown(self):
+    self.router = None
+    self.handle = None
+    self.loop = None
+
+  def testSimpleMessage(self):
+    header_data = messaging.MessageHeader(0, messaging.NO_FLAG).Serialize()
+    message = messaging.Message(header_data)
+    self.router.Accept(message)
+    self.loop.RunUntilIdle()
+    self.assertFalse(self.received_errors)
+    self.assertFalse(self.received_messages)
+    (res, data, _) = self.handle.ReadMessage(bytearray(len(header_data)))
+    self.assertEquals(system.RESULT_OK, res)
+    self.assertEquals(data[0], header_data)
+
+  def testSimpleReception(self):
+    header_data = messaging.MessageHeader(0, messaging.NO_FLAG).Serialize()
+    self.handle.WriteMessage(header_data)
+    self.loop.RunUntilIdle()
+    self.assertFalse(self.received_errors)
+    self.assertEquals(len(self.received_messages), 1)
+    self.assertEquals(self.received_messages[0].data, header_data)
+
+  def testRequestResponse(self):
+    header_data = messaging.MessageHeader(
+        0, messaging.MESSAGE_EXPECTS_RESPONSE_FLAG).Serialize()
+    message = messaging.Message(header_data)
+    back_messages = []
+    def OnBackMessage(message):
+      back_messages.append(message)
+    self.router.AcceptWithResponder(message,
+                                    messaging.ForwardingMessageReceiver(
+                                        OnBackMessage))
+    self.loop.RunUntilIdle()
+    self.assertFalse(self.received_errors)
+    self.assertFalse(self.received_messages)
+    (res, data, _) = self.handle.ReadMessage(bytearray(len(header_data)))
+    self.assertEquals(system.RESULT_OK, res)
+    message_header = messaging.MessageHeader.Deserialize(data[0])
+    self.assertNotEquals(message_header.request_id, 0)
+    response_header_data = messaging.MessageHeader(
+        0,
+        messaging.MESSAGE_IS_RESPONSE_FLAG,
+        message_header.request_id).Serialize()
+    self.handle.WriteMessage(response_header_data)
+    self.loop.RunUntilIdle()
+    self.assertFalse(self.received_errors)
+    self.assertEquals(len(back_messages), 1)
+    self.assertEquals(back_messages[0].data, response_header_data)