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import json
import logging
from testfixtures import LogCapture
from twisted.internet import defer
from twisted.trial.unittest import TestCase
from scrapy.http import Request
from scrapy.crawler import CrawlerRunner
from scrapy.utils.python import to_unicode
from tests.spiders import FollowAllSpider, DelaySpider, SimpleSpider, \
BrokenStartRequestsSpider, SingleRequestSpider, DuplicateStartRequestsSpider
from tests.mockserver import MockServer
class CrawlTestCase(TestCase):
def setUp(self):
self.mockserver = MockServer()
self.mockserver.__enter__()
self.runner = CrawlerRunner()
def tearDown(self):
self.mockserver.__exit__(None, None, None)
@defer.inlineCallbacks
def test_follow_all(self):
crawler = self.runner.create_crawler(FollowAllSpider)
yield crawler.crawl()
self.assertEqual(len(crawler.spider.urls_visited), 11) # 10 + start_url
@defer.inlineCallbacks
def test_delay(self):
# short to long delays
yield self._test_delay(0.2, False)
yield self._test_delay(1, False)
# randoms
yield self._test_delay(0.2, True)
yield self._test_delay(1, True)
@defer.inlineCallbacks
def _test_delay(self, delay, randomize):
settings = {"DOWNLOAD_DELAY": delay, 'RANDOMIZE_DOWNLOAD_DELAY': randomize}
crawler = CrawlerRunner(settings).create_crawler(FollowAllSpider)
yield crawler.crawl(maxlatency=delay * 2)
t = crawler.spider.times
totaltime = t[-1] - t[0]
avgd = totaltime / (len(t) - 1)
tolerance = 0.6 if randomize else 0.2
self.assertTrue(avgd > delay * (1 - tolerance),
"download delay too small: %s" % avgd)
@defer.inlineCallbacks
def test_timeout_success(self):
crawler = self.runner.create_crawler(DelaySpider)
yield crawler.crawl(n=0.5)
self.assertTrue(crawler.spider.t1 > 0)
self.assertTrue(crawler.spider.t2 > 0)
self.assertTrue(crawler.spider.t2 > crawler.spider.t1)
@defer.inlineCallbacks
def test_timeout_failure(self):
crawler = CrawlerRunner({"DOWNLOAD_TIMEOUT": 0.35}).create_crawler(DelaySpider)
yield crawler.crawl(n=0.5)
self.assertTrue(crawler.spider.t1 > 0)
self.assertTrue(crawler.spider.t2 == 0)
self.assertTrue(crawler.spider.t2_err > 0)
self.assertTrue(crawler.spider.t2_err > crawler.spider.t1)
# server hangs after receiving response headers
yield crawler.crawl(n=0.5, b=1)
self.assertTrue(crawler.spider.t1 > 0)
self.assertTrue(crawler.spider.t2 == 0)
self.assertTrue(crawler.spider.t2_err > 0)
self.assertTrue(crawler.spider.t2_err > crawler.spider.t1)
@defer.inlineCallbacks
def test_retry_503(self):
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
yield crawler.crawl("http://localhost:8998/status?n=503")
self._assert_retried(l)
@defer.inlineCallbacks
def test_retry_conn_failed(self):
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
yield crawler.crawl("http://localhost:65432/status?n=503")
self._assert_retried(l)
@defer.inlineCallbacks
def test_retry_dns_error(self):
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
# try to fetch the homepage of a non-existent domain
yield crawler.crawl("http://dns.resolution.invalid./")
self._assert_retried(l)
@defer.inlineCallbacks
def test_start_requests_bug_before_yield(self):
with LogCapture('scrapy', level=logging.ERROR) as l:
crawler = self.runner.create_crawler(BrokenStartRequestsSpider)
yield crawler.crawl(fail_before_yield=1)
self.assertEqual(len(l.records), 1)
record = l.records[0]
self.assertIsNotNone(record.exc_info)
self.assertIs(record.exc_info[0], ZeroDivisionError)
@defer.inlineCallbacks
def test_start_requests_bug_yielding(self):
with LogCapture('scrapy', level=logging.ERROR) as l:
crawler = self.runner.create_crawler(BrokenStartRequestsSpider)
yield crawler.crawl(fail_yielding=1)
self.assertEqual(len(l.records), 1)
record = l.records[0]
self.assertIsNotNone(record.exc_info)
self.assertIs(record.exc_info[0], ZeroDivisionError)
@defer.inlineCallbacks
def test_start_requests_lazyness(self):
settings = {"CONCURRENT_REQUESTS": 1}
crawler = CrawlerRunner(settings).create_crawler(BrokenStartRequestsSpider)
yield crawler.crawl()
#self.assertTrue(False, crawler.spider.seedsseen)
#self.assertTrue(crawler.spider.seedsseen.index(None) < crawler.spider.seedsseen.index(99),
# crawler.spider.seedsseen)
@defer.inlineCallbacks
def test_start_requests_dupes(self):
settings = {"CONCURRENT_REQUESTS": 1}
crawler = CrawlerRunner(settings).create_crawler(DuplicateStartRequestsSpider)
yield crawler.crawl(dont_filter=True, distinct_urls=2, dupe_factor=3)
self.assertEqual(crawler.spider.visited, 6)
yield crawler.crawl(dont_filter=False, distinct_urls=3, dupe_factor=4)
self.assertEqual(crawler.spider.visited, 3)
@defer.inlineCallbacks
def test_unbounded_response(self):
# Completeness of responses without Content-Length or Transfer-Encoding
# can not be determined, we treat them as valid but flagged as "partial"
from six.moves.urllib.parse import urlencode
query = urlencode({'raw': '''\
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
X-Powered-By: Servlet 2.4; JBoss-4.2.3.GA (build: SVNTag=JBoss_4_2_3_GA date=200807181417)/JBossWeb-2.0
Set-Cookie: JSESSIONID=08515F572832D0E659FD2B0D8031D75F; Path=/
Pragma: no-cache
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Cache-Control: no-cache
Cache-Control: no-store
Content-Type: text/html;charset=UTF-8
Content-Language: en
Date: Tue, 27 Aug 2013 13:05:05 GMT
Connection: close
foo body
with multiples lines
'''})
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
yield crawler.crawl("http://localhost:8998/raw?{0}".format(query))
self.assertEqual(str(l).count("Got response 200"), 1)
@defer.inlineCallbacks
def test_retry_conn_lost(self):
# connection lost after receiving data
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
yield crawler.crawl("http://localhost:8998/drop?abort=0")
self._assert_retried(l)
@defer.inlineCallbacks
def test_retry_conn_aborted(self):
# connection lost before receiving data
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as l:
yield crawler.crawl("http://localhost:8998/drop?abort=1")
self._assert_retried(l)
def _assert_retried(self, log):
self.assertEqual(str(log).count("Retrying"), 2)
self.assertEqual(str(log).count("Gave up retrying"), 1)
@defer.inlineCallbacks
def test_referer_header(self):
"""Referer header is set by RefererMiddleware unless it is already set"""
req0 = Request('http://localhost:8998/echo?headers=1&body=0', dont_filter=1)
req1 = req0.replace()
req2 = req0.replace(headers={'Referer': None})
req3 = req0.replace(headers={'Referer': 'http://example.com'})
req0.meta['next'] = req1
req1.meta['next'] = req2
req2.meta['next'] = req3
crawler = self.runner.create_crawler(SingleRequestSpider)
yield crawler.crawl(seed=req0)
# basic asserts in case of weird communication errors
self.assertIn('responses', crawler.spider.meta)
self.assertNotIn('failures', crawler.spider.meta)
# start requests doesn't set Referer header
echo0 = json.loads(to_unicode(crawler.spider.meta['responses'][2].body))
self.assertNotIn('Referer', echo0['headers'])
# following request sets Referer to start request url
echo1 = json.loads(to_unicode(crawler.spider.meta['responses'][1].body))
self.assertEqual(echo1['headers'].get('Referer'), [req0.url])
# next request avoids Referer header
echo2 = json.loads(to_unicode(crawler.spider.meta['responses'][2].body))
self.assertNotIn('Referer', echo2['headers'])
# last request explicitly sets a Referer header
echo3 = json.loads(to_unicode(crawler.spider.meta['responses'][3].body))
self.assertEqual(echo3['headers'].get('Referer'), ['http://example.com'])
@defer.inlineCallbacks
def test_engine_status(self):
from scrapy.utils.engine import get_engine_status
est = []
def cb(response):
est.append(get_engine_status(crawler.engine))
crawler = self.runner.create_crawler(SingleRequestSpider)
yield crawler.crawl(seed='http://localhost:8998/', callback_func=cb)
self.assertEqual(len(est), 1, est)
s = dict(est[0])
self.assertEqual(s['engine.spider.name'], crawler.spider.name)
self.assertEqual(s['len(engine.scraper.slot.active)'], 1)
@defer.inlineCallbacks
def test_graceful_crawl_error_handling(self):
"""
Test whether errors happening anywhere in Crawler.crawl() are properly
reported (and not somehow swallowed) after a graceful engine shutdown.
The errors should not come from within Scrapy's core but from within
spiders/middlewares/etc., e.g. raised in Spider.start_requests(),
SpiderMiddleware.process_start_requests(), etc.
"""
class TestError(Exception):
pass
class FaultySpider(SimpleSpider):
def start_requests(self):
raise TestError
crawler = self.runner.create_crawler(FaultySpider)
yield self.assertFailure(crawler.crawl(), TestError)
self.assertFalse(crawler.crawling)
@defer.inlineCallbacks
def test_open_spider_error_on_faulty_pipeline(self):
settings = {
"ITEM_PIPELINES": {
"tests.pipelines.ZeroDivisionErrorPipeline": 300,
}
}
crawler = CrawlerRunner(settings).create_crawler(SimpleSpider)
yield self.assertFailure(
self.runner.crawl(crawler, "http://localhost:8998/status?n=200"),
ZeroDivisionError)
self.assertFalse(crawler.crawling)
@defer.inlineCallbacks
def test_crawlerrunner_accepts_crawler(self):
crawler = self.runner.create_crawler(SimpleSpider)
with LogCapture() as log:
yield self.runner.crawl(crawler, "http://localhost:8998/status?n=200")
self.assertIn("Got response 200", str(log))
@defer.inlineCallbacks
def test_crawl_multiple(self):
self.runner.crawl(SimpleSpider, "http://localhost:8998/status?n=200")
self.runner.crawl(SimpleSpider, "http://localhost:8998/status?n=503")
with LogCapture() as log:
yield self.runner.join()
self._assert_retried(log)
self.assertIn("Got response 200", str(log))
|
