mirror of https://github.com/scrapy/scrapy.git
102 lines
3.0 KiB
Python
102 lines
3.0 KiB
Python
import time
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from twisted.internet.defer import inlineCallbacks
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from scrapy import Request
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from scrapy.core.downloader import Downloader, Slot
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from scrapy.crawler import CrawlerRunner
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from scrapy.utils.test import get_crawler
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from tests.mockserver.http import MockServer
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from tests.spiders import MetaSpider
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class DownloaderSlotsSettingsTestSpider(MetaSpider):
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name = "downloader_slots"
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custom_settings = {
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"DOWNLOAD_DELAY": 1,
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"RANDOMIZE_DOWNLOAD_DELAY": False,
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"DOWNLOAD_SLOTS": {
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"quotes.toscrape.com": {
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"concurrency": 1,
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"delay": 2,
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"randomize_delay": False,
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"throttle": False,
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},
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"books.toscrape.com": {"delay": 3, "randomize_delay": False},
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},
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}
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async def start(self):
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self.times = {None: []}
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slots = [*self.custom_settings.get("DOWNLOAD_SLOTS", {}), None]
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for slot in slots:
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url = self.mockserver.url(f"/?downloader_slot={slot}")
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self.times[slot] = []
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yield Request(url, callback=self.parse, meta={"download_slot": slot})
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def parse(self, response):
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slot = response.meta.get("download_slot", None)
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self.times[slot].append(time.time())
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url = self.mockserver.url(f"/?downloader_slot={slot}&req=2")
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yield Request(url, callback=self.not_parse, meta={"download_slot": slot})
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def not_parse(self, response):
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slot = response.meta.get("download_slot", None)
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self.times[slot].append(time.time())
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class TestCrawl:
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@classmethod
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def setup_class(cls):
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cls.mockserver = MockServer()
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cls.mockserver.__enter__()
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@classmethod
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def teardown_class(cls):
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cls.mockserver.__exit__(None, None, None)
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def setup_method(self):
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self.runner = CrawlerRunner()
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@inlineCallbacks
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def test_delay(self):
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crawler = get_crawler(DownloaderSlotsSettingsTestSpider)
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yield crawler.crawl(mockserver=self.mockserver)
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slots = crawler.engine.downloader.slots
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times = crawler.spider.times
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tolerance = 0.3
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delays_real = {k: v[1] - v[0] for k, v in times.items()}
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error_delta = {
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k: 1 - min(delays_real[k], v.delay) / max(delays_real[k], v.delay)
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for k, v in slots.items()
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}
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assert max(list(error_delta.values())) < tolerance
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def test_params():
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params = {
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"concurrency": 1,
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"delay": 2,
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"randomize_delay": False,
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}
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settings = {
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"DOWNLOAD_SLOTS": {
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"example.com": params,
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},
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}
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crawler = get_crawler(settings_dict=settings)
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downloader = Downloader(crawler)
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downloader._slot_gc_loop.stop() # Prevent an unclean reactor.
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request = Request("https://example.com")
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_, actual = downloader._get_slot(request, spider=None)
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expected = Slot(**params)
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for param in params:
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assert getattr(expected, param) == getattr(actual, param), (
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f"Slot.{param}: {getattr(expected, param)!r} != {getattr(actual, param)!r}"
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)
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