The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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87 lines
3.0 KiB
87 lines
3.0 KiB
# Copyright 2015, Google Inc. |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are |
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# met: |
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# |
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# * Redistributions of source code must retain the above copyright |
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# notice, this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above |
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# copyright notice, this list of conditions and the following disclaimer |
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# in the documentation and/or other materials provided with the |
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# distribution. |
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# * Neither the name of Google Inc. nor the names of its |
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# contributors may be used to endorse or promote products derived from |
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# this software without specific prior written permission. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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"""Code for instructing systems under test to block or fail.""" |
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import abc |
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import contextlib |
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import threading |
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class Control(object): |
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"""An object that accepts program control from a system under test. |
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Systems under test passed a Control should call its control() method |
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frequently during execution. The control() method may block, raise an |
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exception, or do nothing, all according to the enclosing test's desire for |
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the system under test to simulate hanging, failing, or functioning. |
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""" |
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__metaclass__ = abc.ABCMeta |
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@abc.abstractmethod |
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def control(self): |
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"""Potentially does anything.""" |
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raise NotImplementedError() |
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class PauseFailControl(Control): |
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"""A Control that can be used to pause or fail code under control.""" |
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def __init__(self): |
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self._condition = threading.Condition() |
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self._paused = False |
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self._fail = False |
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def control(self): |
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with self._condition: |
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if self._fail: |
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raise ValueError() |
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while self._paused: |
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self._condition.wait() |
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@contextlib.contextmanager |
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def pause(self): |
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"""Pauses code under control while controlling code is in context.""" |
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with self._condition: |
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self._paused = True |
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yield |
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with self._condition: |
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self._paused = False |
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self._condition.notify_all() |
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@contextlib.contextmanager |
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def fail(self): |
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"""Fails code under control while controlling code is in context.""" |
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with self._condition: |
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self._fail = True |
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yield |
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with self._condition: |
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self._fail = False
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