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| 1 # Copyright 2014 The Chromium Authors. All rights reserved. | 1 # Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
| 4 | 4 |
| 5 """Utility classes to handle sending and receiving messages.""" | 5 """Utility classes to handle sending and receiving messages.""" |
| 6 | 6 |
| 7 | 7 |
| 8 import struct | 8 import struct |
| 9 import weakref | 9 import weakref |
| 10 | 10 |
| 11 # pylint: disable=F0401 | |
| 12 import mojo.bindings.serialization as serialization | 11 import mojo.bindings.serialization as serialization |
| 12 |
| 13 # pylint: disable=E0611,F0401 |
| 13 import mojo.system as system | 14 import mojo.system as system |
| 14 | 15 |
| 15 | 16 |
| 16 # The flag values for a message header. | 17 # The flag values for a message header. |
| 17 NO_FLAG = 0 | 18 NO_FLAG = 0 |
| 18 MESSAGE_EXPECTS_RESPONSE_FLAG = 1 << 0 | 19 MESSAGE_EXPECTS_RESPONSE_FLAG = 1 << 0 |
| 19 MESSAGE_IS_RESPONSE_FLAG = 1 << 1 | 20 MESSAGE_IS_RESPONSE_FLAG = 1 << 1 |
| 20 | 21 |
| 21 | 22 |
| 22 class MessageHeader(object): | 23 class MessageHeader(object): |
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| 378 message_receiver.Accept(Message(bytearray(), [])) | 379 message_receiver.Accept(Message(bytearray(), [])) |
| 379 if result != system.RESULT_RESOURCE_EXHAUSTED: | 380 if result != system.RESULT_RESOURCE_EXHAUSTED: |
| 380 return result | 381 return result |
| 381 (result, data, _) = handle.ReadMessage(bytearray(sizes[0])) | 382 (result, data, _) = handle.ReadMessage(bytearray(sizes[0])) |
| 382 if result == system.RESULT_OK and message_receiver: | 383 if result == system.RESULT_OK and message_receiver: |
| 383 message_receiver.Accept(Message(data[0], data[1])) | 384 message_receiver.Accept(Message(data[0], data[1])) |
| 384 return result | 385 return result |
| 385 | 386 |
| 386 def _HasRequestId(flags): | 387 def _HasRequestId(flags): |
| 387 return flags & (MESSAGE_EXPECTS_RESPONSE_FLAG|MESSAGE_IS_RESPONSE_FLAG) != 0 | 388 return flags & (MESSAGE_EXPECTS_RESPONSE_FLAG|MESSAGE_IS_RESPONSE_FLAG) != 0 |
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