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#! /usr/bin/python | |
import time | |
from functools import wraps | |
def retry(ExceptionToCheck, tries=4, delay=3, backoff=2, logger=None): | |
"""Retry calling the decorated function using an exponential backoff. | |
http://www.saltycrane.com/blog/2009/11/trying-out-retry-decorator-python/ | |
original from: http://wiki.python.org/moin/PythonDecoratorLibrary#Retry | |
:param ExceptionToCheck: the exception to check. may be a tuple of | |
exceptions to check | |
:type ExceptionToCheck: Exception or tuple | |
:param tries: number of times to try (not retry) before giving up | |
:type tries: int | |
:param delay: initial delay between retries in seconds | |
:type delay: int | |
:param backoff: backoff multiplier e.g. value of 2 will double the delay | |
each retry | |
:type backoff: int | |
:param logger: logger to use. If None, print | |
:type logger: logging.Logger instance | |
""" | |
def deco_retry(f): | |
@wraps(f) | |
def f_retry(*args, **kwargs): | |
mtries, mdelay = tries, delay | |
while mtries > 1: | |
try: | |
return f(*args, **kwargs) | |
except ExceptionToCheck: | |
msg = "%s, Retrying in %d seconds..." % (str(''), mdelay) | |
if logger: | |
logger.warning(msg) | |
else: | |
print(msg) | |
time.sleep(mdelay) | |
mtries -= 1 | |
mdelay *= backoff | |
return f(*args, **kwargs) | |
return f_retry # true decorator | |
return deco_retry | |
# example | |
# @decorator.retry(urllib2.URLError, tries=4, delay=3, backoff=1) | |
# def urlopen_with_retry(url): | |
# return urllib2.urlopen(url) |
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