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| 1 # Copyright (C) 2010 Google Inc. All rights reserved. | |
| 2 # | |
| 3 # Redistribution and use in source and binary forms, with or without | |
| 4 # modification, are permitted provided that the following conditions are | |
| 5 # met: | |
| 6 # | |
| 7 # * Redistributions of source code must retain the above copyright | |
| 8 # notice, this list of conditions and the following disclaimer. | |
| 9 # * Redistributions in binary form must reproduce the above | |
| 10 # copyright notice, this list of conditions and the following disclaimer | |
| 11 # in the documentation and/or other materials provided with the | |
| 12 # distribution. | |
| 13 # * Neither the name of Google Inc. nor the names of its | |
| 14 # contributors may be used to endorse or promote products derived from | |
| 15 # this software without specific prior written permission. | |
| 16 # | |
| 17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 28 | |
| 29 import logging | |
| 30 import time | |
| 31 import urllib2 | |
| 32 | |
| 33 _log = logging.getLogger(__name__) | |
| 34 | |
| 35 | |
| 36 class NetworkTimeout(Exception): | |
| 37 | |
| 38 def __str__(self): | |
| 39 return 'NetworkTimeout' | |
| 40 | |
| 41 | |
| 42 class NetworkTransaction(object): | |
| 43 | |
| 44 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 | |
| 46 self._grown_factor = grown_factor | |
| 47 self._timeout_seconds = timeout_seconds | |
| 48 self._convert_404_to_None = convert_404_to_None | |
| 49 self._total_sleep = 0 | |
| 50 self._backoff_seconds = 0 | |
| 51 | |
| 52 def run(self, request): | |
| 53 self._total_sleep = 0 | |
| 54 self._backoff_seconds = self._initial_backoff_seconds | |
| 55 while True: | |
| 56 try: | |
| 57 return request() | |
| 58 except urllib2.HTTPError as e: | |
| 59 if self._convert_404_to_None and e.code == 404: | |
| 60 return None | |
| 61 self._check_for_timeout() | |
| 62 _log.warning("Received HTTP status %s loading \"%s\". Retrying
in %s seconds...", | |
| 63 e.code, e.filename, self._backoff_seconds) | |
| 64 self._sleep() | |
| 65 | |
| 66 def _check_for_timeout(self): | |
| 67 if self._total_sleep + self._backoff_seconds > self._timeout_seconds: | |
| 68 raise NetworkTimeout() | |
| 69 | |
| 70 def _sleep(self): | |
| 71 time.sleep(self._backoff_seconds) | |
| 72 self._total_sleep += self._backoff_seconds | |
| 73 self._backoff_seconds *= self._grown_factor | |
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Chromium Code Reviews
Issue 2578213005:
Use underscores to separate words in filenames in webkitpy. (Closed)
