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1 # Copyright (C) 2010 Google Inc. All rights reserved. | 1 # Copyright (C) 2010 Google Inc. All rights reserved. |
2 # | 2 # |
3 # Redistribution and use in source and binary forms, with or without | 3 # Redistribution and use in source and binary forms, with or without |
4 # modification, are permitted provided that the following conditions are | 4 # modification, are permitted provided that the following conditions are |
5 # met: | 5 # met: |
6 # | 6 # |
7 # * Redistributions of source code must retain the above copyright | 7 # * Redistributions of source code must retain the above copyright |
8 # notice, this list of conditions and the following disclaimer. | 8 # notice, this list of conditions and the following disclaimer. |
9 # * Redistributions in binary form must reproduce the above | 9 # * Redistributions in binary form must reproduce the above |
10 # copyright notice, this list of conditions and the following disclaimer | 10 # copyright notice, this list of conditions and the following disclaimer |
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34 | 34 |
35 | 35 |
36 class NetworkTimeout(Exception): | 36 class NetworkTimeout(Exception): |
37 | 37 |
38 def __str__(self): | 38 def __str__(self): |
39 return 'NetworkTimeout' | 39 return 'NetworkTimeout' |
40 | 40 |
41 | 41 |
42 class NetworkTransaction(object): | 42 class NetworkTransaction(object): |
43 | 43 |
| 44 # TODO(qyearsley): Rename convert_404_to_None |
| 45 # pylint: disable=invalid-name |
| 46 |
44 def __init__(self, initial_backoff_seconds=10, grown_factor=1.5, timeout_sec
onds=(10 * 60), convert_404_to_None=False): | 47 def __init__(self, initial_backoff_seconds=10, grown_factor=1.5, timeout_sec
onds=(10 * 60), convert_404_to_None=False): |
45 self._initial_backoff_seconds = initial_backoff_seconds | 48 self._initial_backoff_seconds = initial_backoff_seconds |
46 self._grown_factor = grown_factor | 49 self._grown_factor = grown_factor |
47 self._timeout_seconds = timeout_seconds | 50 self._timeout_seconds = timeout_seconds |
48 self._convert_404_to_None = convert_404_to_None | 51 self._convert_404_to_None = convert_404_to_None |
49 self._total_sleep = 0 | 52 self._total_sleep = 0 |
50 self._backoff_seconds = 0 | 53 self._backoff_seconds = 0 |
51 | 54 |
52 def run(self, request): | 55 def run(self, request): |
53 self._total_sleep = 0 | 56 self._total_sleep = 0 |
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64 self._sleep() | 67 self._sleep() |
65 | 68 |
66 def _check_for_timeout(self): | 69 def _check_for_timeout(self): |
67 if self._total_sleep + self._backoff_seconds > self._timeout_seconds: | 70 if self._total_sleep + self._backoff_seconds > self._timeout_seconds: |
68 raise NetworkTimeout() | 71 raise NetworkTimeout() |
69 | 72 |
70 def _sleep(self): | 73 def _sleep(self): |
71 time.sleep(self._backoff_seconds) | 74 time.sleep(self._backoff_seconds) |
72 self._total_sleep += self._backoff_seconds | 75 self._total_sleep += self._backoff_seconds |
73 self._backoff_seconds *= self._grown_factor | 76 self._backoff_seconds *= self._grown_factor |
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