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69 lines
2.9 KiB
Python
69 lines
2.9 KiB
Python
# Copyright (C) 2010 Google Inc. 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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import logging
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import time
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import urllib2
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_log = logging.getLogger(__name__)
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class NetworkTimeout(Exception):
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def __str__(self):
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return 'NetworkTimeout'
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class NetworkTransaction(object):
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def __init__(self, initial_backoff_seconds=10, grown_factor=1.5, timeout_seconds=(10 * 60), convert_404_to_None=False):
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self._initial_backoff_seconds = initial_backoff_seconds
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self._grown_factor = grown_factor
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self._timeout_seconds = timeout_seconds
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self._convert_404_to_None = convert_404_to_None
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def run(self, request):
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self._total_sleep = 0
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self._backoff_seconds = self._initial_backoff_seconds
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while True:
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try:
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return request()
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except urllib2.HTTPError, e:
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if self._convert_404_to_None and e.code == 404:
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return None
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self._check_for_timeout()
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_log.warn("Received HTTP status %s loading \"%s\". Retrying in %s seconds..." % (e.code, e.filename, self._backoff_seconds))
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self._sleep()
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def _check_for_timeout(self):
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if self._total_sleep + self._backoff_seconds > self._timeout_seconds:
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raise NetworkTimeout()
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def _sleep(self):
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time.sleep(self._backoff_seconds)
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self._total_sleep += self._backoff_seconds
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self._backoff_seconds *= self._grown_factor
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