利用python 写一些网络服务的时候,当网络状况不好,或者资源占用过多,任务拥塞的情况下,总会抛出一些异常,当前任务就被终止了,可以很好的利用@装饰器,写一个重试的装饰器,这样比较python!
执行结果:
WARNING:root:timed out,retrying in 3 seconds...
WARNING:root:timed out,retrying in 6 seconds...
WARNING:root:timed out,retrying in 12 seconds...
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# tanyewei@gmail.com
# 2014/01/27 10:36
import time
import logging
import socket
from functools import wraps
logging.basicConfig(level=logging.DEBUG)
def retry(MyException,tries=4,delay=3,backoff=2,logger=None):
def deco_retry(f):
@wraps(f)
def f_retry(*args,**kwargs):
mtries,mdelay = tries,delay
while mtries > 1:
try:
return f(*args,**kwargs)
except MyException as ex:
msg = "%s,retrying in %d seconds..." % (str(ex),mdelay)
if logger:
logger.warning(msg)
else:
print msg
time.sleep(mdelay)
mtries -= 1
mdelay *= backoff
return str(ex)
return f_retry
return deco_retry
@retry(Exception,logger=logging)
def check():
sk = socket.socket()
sk.settimeout(5)
sk.connect(('6.6.6.6',80))
if __name__ == "__main__":
check()
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