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import logging
from unittest import TestCase
from testfixtures import LogCapture
from twisted.trial.unittest import TestCase as TrialTestCase
from twisted.internet import defer
from scrapy.utils.test import get_crawler
from tests.mockserver import MockServer
from scrapy.http import Response, Request
from scrapy.spiders import Spider
from scrapy.spidermiddlewares.httperror import HttpErrorMiddleware, HttpError
from scrapy.settings import Settings
class _HttpErrorSpider(Spider):
name = 'httperror'
start_urls = [
"http://localhost:8998/status?n=200",
"http://localhost:8998/status?n=404",
"http://localhost:8998/status?n=402",
"http://localhost:8998/status?n=500",
]
bypass_status_codes = set()
def __init__(self, *args, **kwargs):
super(_HttpErrorSpider, self).__init__(*args, **kwargs)
self.failed = set()
self.skipped = set()
self.parsed = set()
def start_requests(self):
for url in self.start_urls:
yield Request(url, self.parse, errback=self.on_error)
def parse(self, response):
self.parsed.add(response.url[-3:])
def on_error(self, failure):
if isinstance(failure.value, HttpError):
response = failure.value.response
if response.status in self.bypass_status_codes:
self.skipped.add(response.url[-3:])
return self.parse(response)
# it assumes there is a response attached to failure
self.failed.add(failure.value.response.url[-3:])
return failure
def _responses(request, status_codes):
responses = []
for code in status_codes:
response = Response(request.url, status=code)
response.request = request
responses.append(response)
return responses
class TestHttpErrorMiddleware(TestCase):
def setUp(self):
crawler = get_crawler(Spider)
self.spider = Spider.from_crawler(crawler, name='foo')
self.mw = HttpErrorMiddleware(Settings({}))
self.req = Request('http://scrapytest.org')
self.res200, self.res404 = _responses(self.req, [200, 404])
def test_process_spider_input(self):
self.assertEqual(None,
self.mw.process_spider_input(self.res200, self.spider))
self.assertRaises(HttpError,
self.mw.process_spider_input, self.res404, self.spider)
def test_process_spider_exception(self):
self.assertEqual([],
self.mw.process_spider_exception(self.res404,
HttpError(self.res404), self.spider))
self.assertEqual(None,
self.mw.process_spider_exception(self.res404,
Exception(), self.spider))
def test_handle_httpstatus_list(self):
res = self.res404.copy()
res.request = Request('http://scrapytest.org',
meta={'handle_httpstatus_list': [404]})
self.assertEqual(None,
self.mw.process_spider_input(res, self.spider))
self.spider.handle_httpstatus_list = [404]
self.assertEqual(None,
self.mw.process_spider_input(self.res404, self.spider))
class TestHttpErrorMiddlewareSettings(TestCase):
"""Similar test, but with settings"""
def setUp(self):
self.spider = Spider('foo')
self.mw = HttpErrorMiddleware(Settings({'HTTPERROR_ALLOWED_CODES': (402,)}))
self.req = Request('http://scrapytest.org')
self.res200, self.res404, self.res402 = _responses(self.req, [200, 404, 402])
def test_process_spider_input(self):
self.assertEqual(None,
self.mw.process_spider_input(self.res200, self.spider))
self.assertRaises(HttpError,
self.mw.process_spider_input, self.res404, self.spider)
self.assertEqual(None,
self.mw.process_spider_input(self.res402, self.spider))
def test_meta_overrides_settings(self):
request = Request('http://scrapytest.org',
meta={'handle_httpstatus_list': [404]})
res404 = self.res404.copy()
res404.request = request
res402 = self.res402.copy()
res402.request = request
self.assertEqual(None,
self.mw.process_spider_input(res404, self.spider))
self.assertRaises(HttpError,
self.mw.process_spider_input, res402, self.spider)
def test_spider_override_settings(self):
self.spider.handle_httpstatus_list = [404]
self.assertEqual(None,
self.mw.process_spider_input(self.res404, self.spider))
self.assertRaises(HttpError,
self.mw.process_spider_input, self.res402, self.spider)
class TestHttpErrorMiddlewareHandleAll(TestCase):
def setUp(self):
self.spider = Spider('foo')
self.mw = HttpErrorMiddleware(Settings({'HTTPERROR_ALLOW_ALL': True}))
self.req = Request('http://scrapytest.org')
self.res200, self.res404, self.res402 = _responses(self.req, [200, 404, 402])
def test_process_spider_input(self):
self.assertEqual(None,
self.mw.process_spider_input(self.res200, self.spider))
self.assertEqual(None,
self.mw.process_spider_input(self.res404, self.spider))
def test_meta_overrides_settings(self):
request = Request('http://scrapytest.org',
meta={'handle_httpstatus_list': [404]})
res404 = self.res404.copy()
res404.request = request
res402 = self.res402.copy()
res402.request = request
self.assertEqual(None,
self.mw.process_spider_input(res404, self.spider))
self.assertRaises(HttpError,
self.mw.process_spider_input, res402, self.spider)
class TestHttpErrorMiddlewareIntegrational(TrialTestCase):
def setUp(self):
self.mockserver = MockServer()
self.mockserver.__enter__()
def tearDown(self):
self.mockserver.__exit__(None, None, None)
@defer.inlineCallbacks
def test_middleware_works(self):
crawler = get_crawler(_HttpErrorSpider)
yield crawler.crawl()
assert not crawler.spider.skipped, crawler.spider.skipped
self.assertEqual(crawler.spider.parsed, {'200'})
self.assertEqual(crawler.spider.failed, {'404', '402', '500'})
get_value = crawler.stats.get_value
self.assertEqual(get_value('httperror/response_ignored_count'), 3)
self.assertEqual(get_value('httperror/response_ignored_status_count/404'), 1)
self.assertEqual(get_value('httperror/response_ignored_status_count/402'), 1)
self.assertEqual(get_value('httperror/response_ignored_status_count/500'), 1)
@defer.inlineCallbacks
def test_logging(self):
crawler = get_crawler(_HttpErrorSpider)
with LogCapture() as log:
yield crawler.crawl(bypass_status_codes={402})
self.assertEqual(crawler.spider.parsed, {'200', '402'})
self.assertEqual(crawler.spider.skipped, {'402'})
self.assertEqual(crawler.spider.failed, {'404', '500'})
self.assertIn('Ignoring response <404', str(log))
self.assertIn('Ignoring response <500', str(log))
self.assertNotIn('Ignoring response <200', str(log))
self.assertNotIn('Ignoring response <402', str(log))
@defer.inlineCallbacks
def test_logging_level(self):
# HttpError logs ignored responses with level INFO
crawler = get_crawler(_HttpErrorSpider)
with LogCapture(level=logging.INFO) as log:
yield crawler.crawl()
self.assertEqual(crawler.spider.parsed, {'200'})
self.assertEqual(crawler.spider.failed, {'404', '402', '500'})
self.assertIn('Ignoring response <402', str(log))
self.assertIn('Ignoring response <404', str(log))
self.assertIn('Ignoring response <500', str(log))
self.assertNotIn('Ignoring response <200', str(log))
# with level WARNING, we shouldn't capture anything from HttpError
crawler = get_crawler(_HttpErrorSpider)
with LogCapture(level=logging.WARNING) as log:
yield crawler.crawl()
self.assertEqual(crawler.spider.parsed, {'200'})
self.assertEqual(crawler.spider.failed, {'404', '402', '500'})
self.assertNotIn('Ignoring response <402', str(log))
self.assertNotIn('Ignoring response <404', str(log))
self.assertNotIn('Ignoring response <500', str(log))
self.assertNotIn('Ignoring response <200', str(log))
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