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import unittest
from twisted.internet.error import TimeoutError as ServerTimeoutError, DNSLookupError, \
ConnectionRefusedError, ConnectionDone, ConnectError, \
ConnectionLost
from scrapy.contrib.downloadermiddleware.retry import RetryMiddleware
from scrapy.spider import BaseSpider
from scrapy.http import Request, Response
class RetryTest(unittest.TestCase):
def setUp(self):
self.spider = BaseSpider('foo')
self.mw = RetryMiddleware()
self.mw.max_retry_times = 2
def test_priority_adjust(self):
req = Request('http://www.scrapytest.org/503')
rsp = Response('http://www.scrapytest.org/503', body='', status=503)
req2 = self.mw.process_response(req, rsp, self.spider)
assert req2.priority < req.priority
def test_404(self):
req = Request('http://www.scrapytest.org/404')
rsp = Response('http://www.scrapytest.org/404', body='', status=404)
# dont retry 404s
assert self.mw.process_response(req, rsp, self.spider) is rsp
def test_dont_retry(self):
req = Request('http://www.scrapytest.org/503', meta={'dont_retry': True})
rsp = Response('http://www.scrapytest.org/503', body='', status=503)
# first retry
r = self.mw.process_response(req, rsp, self.spider)
assert r is rsp
def test_dont_retry_exc(self):
req = Request('http://www.scrapytest.org/503', meta={'dont_retry': True})
rsp = Response('http://www.scrapytest.org/503', body='', status=503)
r = self.mw.process_exception(req, DNSLookupError(), self.spider)
assert r is None
def test_503(self):
req = Request('http://www.scrapytest.org/503')
rsp = Response('http://www.scrapytest.org/503', body='', status=503)
# first retry
req = self.mw.process_response(req, rsp, self.spider)
assert isinstance(req, Request)
self.assertEqual(req.meta['retry_times'], 1)
# second retry
req = self.mw.process_response(req, rsp, self.spider)
assert isinstance(req, Request)
self.assertEqual(req.meta['retry_times'], 2)
# discard it
assert self.mw.process_response(req, rsp, self.spider) is rsp
def test_twistederrors(self):
for exc in (ServerTimeoutError, DNSLookupError, ConnectionRefusedError, ConnectionDone, ConnectError, ConnectionLost):
req = Request('http://www.scrapytest.org/%s' % exc.__name__)
self._test_retry_exception(req, exc())
def _test_retry_exception(self, req, exception):
# first retry
req = self.mw.process_exception(req, exception, self.spider)
assert isinstance(req, Request)
self.assertEqual(req.meta['retry_times'], 1)
# second retry
req = self.mw.process_exception(req, exception, self.spider)
assert isinstance(req, Request)
self.assertEqual(req.meta['retry_times'], 2)
# discard it
req = self.mw.process_exception(req, exception, self.spider)
self.assertEqual(req, None)
if __name__ == "__main__":
unittest.main()
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