通过扩展requests.Session类，我可以获得所需的可靠性。
这是代码https://bitbucket.org/bspeakmon/jira- python/src/a7fca855394402f58507ca4056de87ccdbd6a213/jira/resilientsession.py?at=master
该代码是：
from requests import Session
from requests.exceptions import ConnectionError
import logging
import time
class ResilientSession(Session):
"""
This class is supposed to retry requests that do return temporary errors.
At this moment it supports: 502, 503, 504
"""
def __recoverable(self, error, url, request, counter=1):
if hasattr(error,'status_code'):
if error.status_code in [502, 503, 504]:
error = "HTTP %s" % error.status_code
else:
return False
DELAY = 10 * counter
logging.warn("Got recoverable error [%s] from %s %s, retry #%s in %ss" % (error, request, url, counter, DELAY))
time.sleep(DELAY)
return True
def get(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).get(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'GET', counter):
continue
return r
def post(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).post(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'POST', counter):
continue
return r
def delete(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).delete(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'DELETE', counter):
continue
return r
def put(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).put(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'PUT', counter):
continue
return r
def head(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).head(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'HEAD', counter):
continue
return r
def patch(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).patch(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'PATCH', counter):
continue
return r
def options(self, url, **kwargs):
counter = 0
while True:
counter += 1
try:
r = super(ResilientSession, self).options(url, **kwargs)
except ConnectionError as e:
r = e.message
if self.__recoverable(r, url, 'OPTIONS', counter):
continue
return r
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