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452 lines
17 KiB
Python
452 lines
17 KiB
Python
"""
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Scrapy engine tests
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This starts a testing web server (using twisted.server.Site) and then crawls it
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with the Scrapy crawler.
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To view the testing web server in a browser you can start it by running this
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module with the ``runserver`` argument::
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python test_engine.py runserver
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"""
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import os
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import re
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import sys
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from collections import defaultdict
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from urllib.parse import urlparse
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import attr
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from itemadapter import ItemAdapter
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from pydispatch import dispatcher
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from testfixtures import LogCapture
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from twisted.internet import defer, reactor
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from twisted.trial import unittest
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from twisted.web import server, static, util
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from scrapy import signals
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from scrapy.core.engine import ExecutionEngine
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from scrapy.exceptions import StopDownload
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from scrapy.http import Request
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from scrapy.item import Item, Field
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from scrapy.linkextractors import LinkExtractor
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from scrapy.spiders import Spider
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from scrapy.utils.signal import disconnect_all
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from scrapy.utils.test import get_crawler
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from tests import get_testdata, tests_datadir
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class TestItem(Item):
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name = Field()
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url = Field()
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price = Field()
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@attr.s
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class AttrsItem:
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name = attr.ib(default="")
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url = attr.ib(default="")
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price = attr.ib(default=0)
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class TestSpider(Spider):
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name = "scrapytest.org"
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allowed_domains = ["scrapytest.org", "localhost"]
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itemurl_re = re.compile(r"item\d+.html")
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name_re = re.compile(r"<h1>(.*?)</h1>", re.M)
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price_re = re.compile(r">Price: \$(.*?)<", re.M)
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item_cls = TestItem
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def parse(self, response):
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xlink = LinkExtractor()
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itemre = re.compile(self.itemurl_re)
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for link in xlink.extract_links(response):
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if itemre.search(link.url):
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yield Request(url=link.url, callback=self.parse_item)
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def parse_item(self, response):
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item = self.item_cls()
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m = self.name_re.search(response.text)
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if m:
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item['name'] = m.group(1)
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item['url'] = response.url
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m = self.price_re.search(response.text)
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if m:
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item['price'] = m.group(1)
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return item
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class TestDupeFilterSpider(TestSpider):
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def start_requests(self):
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return (Request(url) for url in self.start_urls) # no dont_filter=True
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class DictItemsSpider(TestSpider):
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item_cls = dict
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class AttrsItemsSpider(TestSpider):
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item_class = AttrsItem
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try:
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from dataclasses import make_dataclass
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except ImportError:
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DataClassItemsSpider = None
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else:
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TestDataClass = make_dataclass("TestDataClass", [("name", str), ("url", str), ("price", int)])
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class DataClassItemsSpider(DictItemsSpider):
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def parse_item(self, response):
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item = super().parse_item(response)
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return TestDataClass(
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name=item.get('name'),
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url=item.get('url'),
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price=item.get('price'),
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)
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class ItemZeroDivisionErrorSpider(TestSpider):
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custom_settings = {
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"ITEM_PIPELINES": {
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"tests.pipelines.ProcessWithZeroDivisionErrorPipiline": 300,
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}
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}
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def start_test_site(debug=False):
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root_dir = os.path.join(tests_datadir, "test_site")
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r = static.File(root_dir)
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r.putChild(b"redirect", util.Redirect(b"/redirected"))
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r.putChild(b"redirected", static.Data(b"Redirected here", "text/plain"))
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numbers = [str(x).encode("utf8") for x in range(2**18)]
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r.putChild(b"numbers", static.Data(b"".join(numbers), "text/plain"))
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port = reactor.listenTCP(0, server.Site(r), interface="127.0.0.1")
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if debug:
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print(f"Test server running at http://localhost:{port.getHost().port}/ "
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"- hit Ctrl-C to finish.")
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return port
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class CrawlerRun:
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"""A class to run the crawler and keep track of events occurred"""
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def __init__(self, spider_class):
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self.spider = None
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self.respplug = []
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self.reqplug = []
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self.reqdropped = []
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self.reqreached = []
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self.itemerror = []
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self.itemresp = []
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self.bytes = defaultdict(lambda: list())
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self.signals_caught = {}
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self.spider_class = spider_class
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def run(self):
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self.port = start_test_site()
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self.portno = self.port.getHost().port
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start_urls = [
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self.geturl("/"),
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self.geturl("/redirect"),
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self.geturl("/redirect"), # duplicate
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self.geturl("/numbers"),
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]
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for name, signal in vars(signals).items():
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if not name.startswith('_'):
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dispatcher.connect(self.record_signal, signal)
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self.crawler = get_crawler(self.spider_class)
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self.crawler.signals.connect(self.item_scraped, signals.item_scraped)
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self.crawler.signals.connect(self.item_error, signals.item_error)
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self.crawler.signals.connect(self.bytes_received, signals.bytes_received)
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self.crawler.signals.connect(self.request_scheduled, signals.request_scheduled)
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self.crawler.signals.connect(self.request_dropped, signals.request_dropped)
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self.crawler.signals.connect(self.request_reached, signals.request_reached_downloader)
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self.crawler.signals.connect(self.response_downloaded, signals.response_downloaded)
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self.crawler.crawl(start_urls=start_urls)
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self.spider = self.crawler.spider
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self.deferred = defer.Deferred()
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dispatcher.connect(self.stop, signals.engine_stopped)
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return self.deferred
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def stop(self):
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self.port.stopListening()
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for name, signal in vars(signals).items():
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if not name.startswith('_'):
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disconnect_all(signal)
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self.deferred.callback(None)
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def geturl(self, path):
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return f"http://localhost:{self.portno}{path}"
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def getpath(self, url):
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u = urlparse(url)
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return u.path
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def item_error(self, item, response, spider, failure):
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self.itemerror.append((item, response, spider, failure))
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def item_scraped(self, item, spider, response):
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self.itemresp.append((item, response))
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def bytes_received(self, data, request, spider):
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self.bytes[request].append(data)
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def request_scheduled(self, request, spider):
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self.reqplug.append((request, spider))
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def request_reached(self, request, spider):
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self.reqreached.append((request, spider))
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def request_dropped(self, request, spider):
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self.reqdropped.append((request, spider))
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def response_downloaded(self, response, spider):
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self.respplug.append((response, spider))
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def record_signal(self, *args, **kwargs):
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"""Record a signal and its parameters"""
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signalargs = kwargs.copy()
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sig = signalargs.pop('signal')
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signalargs.pop('sender', None)
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self.signals_caught[sig] = signalargs
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class StopDownloadCrawlerRun(CrawlerRun):
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"""
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Make sure raising the StopDownload exception stops the download of the response body
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"""
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def bytes_received(self, data, request, spider):
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super().bytes_received(data, request, spider)
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raise StopDownload(fail=False)
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class EngineTest(unittest.TestCase):
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@defer.inlineCallbacks
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def test_crawler(self):
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for spider in (TestSpider, DictItemsSpider, AttrsItemsSpider, DataClassItemsSpider):
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if spider is None:
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continue
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self.run = CrawlerRun(spider)
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yield self.run.run()
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self._assert_visited_urls()
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self._assert_scheduled_requests(urls_to_visit=9)
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self._assert_downloaded_responses()
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self._assert_scraped_items()
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self._assert_signals_caught()
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self._assert_bytes_received()
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@defer.inlineCallbacks
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def test_crawler_dupefilter(self):
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self.run = CrawlerRun(TestDupeFilterSpider)
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yield self.run.run()
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self._assert_scheduled_requests(urls_to_visit=8)
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self._assert_dropped_requests()
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@defer.inlineCallbacks
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def test_crawler_itemerror(self):
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self.run = CrawlerRun(ItemZeroDivisionErrorSpider)
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yield self.run.run()
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self._assert_items_error()
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def _assert_visited_urls(self):
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must_be_visited = ["/", "/redirect", "/redirected",
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"/item1.html", "/item2.html", "/item999.html"]
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urls_visited = {rp[0].url for rp in self.run.respplug}
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urls_expected = {self.run.geturl(p) for p in must_be_visited}
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assert urls_expected <= urls_visited, f"URLs not visited: {list(urls_expected - urls_visited)}"
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def _assert_scheduled_requests(self, urls_to_visit=None):
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self.assertEqual(urls_to_visit, len(self.run.reqplug))
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paths_expected = ['/item999.html', '/item2.html', '/item1.html']
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urls_requested = {rq[0].url for rq in self.run.reqplug}
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urls_expected = {self.run.geturl(p) for p in paths_expected}
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assert urls_expected <= urls_requested
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scheduled_requests_count = len(self.run.reqplug)
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dropped_requests_count = len(self.run.reqdropped)
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responses_count = len(self.run.respplug)
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self.assertEqual(scheduled_requests_count,
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dropped_requests_count + responses_count)
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self.assertEqual(len(self.run.reqreached),
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responses_count)
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def _assert_dropped_requests(self):
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self.assertEqual(len(self.run.reqdropped), 1)
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def _assert_downloaded_responses(self):
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# response tests
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self.assertEqual(9, len(self.run.respplug))
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self.assertEqual(9, len(self.run.reqreached))
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for response, _ in self.run.respplug:
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if self.run.getpath(response.url) == '/item999.html':
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self.assertEqual(404, response.status)
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if self.run.getpath(response.url) == '/redirect':
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self.assertEqual(302, response.status)
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def _assert_items_error(self):
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self.assertEqual(2, len(self.run.itemerror))
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for item, response, spider, failure in self.run.itemerror:
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self.assertEqual(failure.value.__class__, ZeroDivisionError)
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self.assertEqual(spider, self.run.spider)
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self.assertEqual(item['url'], response.url)
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if 'item1.html' in item['url']:
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self.assertEqual('Item 1 name', item['name'])
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self.assertEqual('100', item['price'])
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if 'item2.html' in item['url']:
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self.assertEqual('Item 2 name', item['name'])
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self.assertEqual('200', item['price'])
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def _assert_scraped_items(self):
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self.assertEqual(2, len(self.run.itemresp))
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for item, response in self.run.itemresp:
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item = ItemAdapter(item)
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self.assertEqual(item['url'], response.url)
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if 'item1.html' in item['url']:
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self.assertEqual('Item 1 name', item['name'])
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self.assertEqual('100', item['price'])
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if 'item2.html' in item['url']:
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self.assertEqual('Item 2 name', item['name'])
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self.assertEqual('200', item['price'])
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def _assert_bytes_received(self):
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self.assertEqual(9, len(self.run.bytes))
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for request, data in self.run.bytes.items():
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joined_data = b"".join(data)
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if self.run.getpath(request.url) == "/":
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self.assertEqual(joined_data, get_testdata("test_site", "index.html"))
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elif self.run.getpath(request.url) == "/item1.html":
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self.assertEqual(joined_data, get_testdata("test_site", "item1.html"))
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elif self.run.getpath(request.url) == "/item2.html":
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self.assertEqual(joined_data, get_testdata("test_site", "item2.html"))
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elif self.run.getpath(request.url) == "/redirected":
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self.assertEqual(joined_data, b"Redirected here")
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elif self.run.getpath(request.url) == '/redirect':
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self.assertEqual(
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joined_data,
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b"\n<html>\n"
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b" <head>\n"
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b" <meta http-equiv=\"refresh\" content=\"0;URL=/redirected\">\n"
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b" </head>\n"
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b" <body bgcolor=\"#FFFFFF\" text=\"#000000\">\n"
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b" <a href=\"/redirected\">click here</a>\n"
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b" </body>\n"
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b"</html>\n"
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)
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elif self.run.getpath(request.url) == "/tem999.html":
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self.assertEqual(
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joined_data,
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b"\n<html>\n"
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b" <head><title>404 - No Such Resource</title></head>\n"
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b" <body>\n"
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b" <h1>No Such Resource</h1>\n"
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b" <p>File not found.</p>\n"
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b" </body>\n"
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b"</html>\n"
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)
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elif self.run.getpath(request.url) == "/numbers":
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# signal was fired multiple times
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self.assertTrue(len(data) > 1)
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# bytes were received in order
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numbers = [str(x).encode("utf8") for x in range(2**18)]
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self.assertEqual(joined_data, b"".join(numbers))
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def _assert_signals_caught(self):
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assert signals.engine_started in self.run.signals_caught
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assert signals.engine_stopped in self.run.signals_caught
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assert signals.spider_opened in self.run.signals_caught
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assert signals.spider_idle in self.run.signals_caught
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assert signals.spider_closed in self.run.signals_caught
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self.assertEqual({'spider': self.run.spider},
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self.run.signals_caught[signals.spider_opened])
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self.assertEqual({'spider': self.run.spider},
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self.run.signals_caught[signals.spider_idle])
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self.assertEqual({'spider': self.run.spider, 'reason': 'finished'},
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self.run.signals_caught[signals.spider_closed])
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@defer.inlineCallbacks
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def test_close_downloader(self):
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e = ExecutionEngine(get_crawler(TestSpider), lambda _: None)
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yield e.close()
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@defer.inlineCallbacks
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def test_close_spiders_downloader(self):
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e = ExecutionEngine(get_crawler(TestSpider), lambda _: None)
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yield e.open_spider(TestSpider(), [])
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self.assertEqual(len(e.open_spiders), 1)
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yield e.close()
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self.assertEqual(len(e.open_spiders), 0)
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@defer.inlineCallbacks
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def test_close_engine_spiders_downloader(self):
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e = ExecutionEngine(get_crawler(TestSpider), lambda _: None)
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yield e.open_spider(TestSpider(), [])
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e.start()
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self.assertTrue(e.running)
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yield e.close()
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self.assertFalse(e.running)
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self.assertEqual(len(e.open_spiders), 0)
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class StopDownloadEngineTest(EngineTest):
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@defer.inlineCallbacks
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def test_crawler(self):
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for spider in TestSpider, DictItemsSpider:
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self.run = StopDownloadCrawlerRun(spider)
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with LogCapture() as log:
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yield self.run.run()
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log.check_present(("scrapy.core.downloader.handlers.http11",
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"DEBUG",
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f"Download stopped for <GET http://localhost:{self.run.portno}/redirected> "
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"from signal handler"
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" StopDownloadCrawlerRun.bytes_received"))
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log.check_present(("scrapy.core.downloader.handlers.http11",
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"DEBUG",
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f"Download stopped for <GET http://localhost:{self.run.portno}/> "
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"from signal handler"
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" StopDownloadCrawlerRun.bytes_received"))
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log.check_present(("scrapy.core.downloader.handlers.http11",
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"DEBUG",
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f"Download stopped for <GET http://localhost:{self.run.portno}/numbers> "
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"from signal handler"
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" StopDownloadCrawlerRun.bytes_received"))
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self._assert_visited_urls()
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self._assert_scheduled_requests(urls_to_visit=9)
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self._assert_downloaded_responses()
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self._assert_signals_caught()
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self._assert_bytes_received()
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def _assert_bytes_received(self):
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self.assertEqual(9, len(self.run.bytes))
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for request, data in self.run.bytes.items():
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joined_data = b"".join(data)
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self.assertTrue(len(data) == 1) # signal was fired only once
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if self.run.getpath(request.url) == "/numbers":
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# Received bytes are not the complete response. The exact amount depends
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# on the buffer size, which can vary, so we only check that the amount
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# of received bytes is strictly less than the full response.
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numbers = [str(x).encode("utf8") for x in range(2**18)]
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self.assertTrue(len(joined_data) < len(b"".join(numbers)))
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if __name__ == "__main__":
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if len(sys.argv) > 1 and sys.argv[1] == 'runserver':
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start_test_site(debug=True)
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reactor.run()
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