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202 lines
7.3 KiB
Python
202 lines
7.3 KiB
Python
import shutil
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from pathlib import Path
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from testfixtures import LogCapture
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from twisted.internet import defer
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from twisted.trial.unittest import TestCase
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from w3lib.url import add_or_replace_parameter
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from scrapy.crawler import CrawlerRunner
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from scrapy import signals
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from tests.mockserver import MockServer
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from tests.spiders import SimpleSpider
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class MediaDownloadSpider(SimpleSpider):
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name = 'mediadownload'
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def _process_url(self, url):
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return url
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def parse(self, response):
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self.logger.info(response.headers)
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self.logger.info(response.text)
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item = {
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self.media_key: [],
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self.media_urls_key: [
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self._process_url(response.urljoin(href))
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for href in response.xpath(
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'//table[thead/tr/th="Filename"]/tbody//a/@href'
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).getall()],
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}
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yield item
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class BrokenLinksMediaDownloadSpider(MediaDownloadSpider):
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name = 'brokenmedia'
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def _process_url(self, url):
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return url + '.foo'
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class RedirectedMediaDownloadSpider(MediaDownloadSpider):
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name = 'redirectedmedia'
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def _process_url(self, url):
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return add_or_replace_parameter(self.mockserver.url('/redirect-to'), 'goto', url)
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class FileDownloadCrawlTestCase(TestCase):
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pipeline_class = 'scrapy.pipelines.files.FilesPipeline'
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store_setting_key = 'FILES_STORE'
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media_key = 'files'
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media_urls_key = 'file_urls'
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expected_checksums = {
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'5547178b89448faf0015a13f904c936e',
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'c2281c83670e31d8aaab7cb642b824db',
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'ed3f6538dc15d4d9179dae57319edc5f'}
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def setUp(self):
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self.mockserver = MockServer()
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self.mockserver.__enter__()
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# prepare a directory for storing files
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self.tmpmediastore = Path(self.mktemp())
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self.tmpmediastore.mkdir()
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self.settings = {
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'REQUEST_FINGERPRINTER_IMPLEMENTATION': 'VERSION',
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'ITEM_PIPELINES': {self.pipeline_class: 1},
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self.store_setting_key: str(self.tmpmediastore),
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}
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self.runner = CrawlerRunner(self.settings)
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self.items = []
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def tearDown(self):
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shutil.rmtree(self.tmpmediastore)
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self.items = []
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self.mockserver.__exit__(None, None, None)
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def _on_item_scraped(self, item):
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self.items.append(item)
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def _create_crawler(self, spider_class, runner=None, **kwargs):
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if runner is None:
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runner = self.runner
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crawler = runner.create_crawler(spider_class, **kwargs)
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crawler.signals.connect(self._on_item_scraped, signals.item_scraped)
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return crawler
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def _assert_files_downloaded(self, items, logs):
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self.assertEqual(len(items), 1)
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self.assertIn(self.media_key, items[0])
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# check that logs show the expected number of successful file downloads
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file_dl_success = 'File (downloaded): Downloaded file from'
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self.assertEqual(logs.count(file_dl_success), 3)
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# check that the images/files status is `downloaded`
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for item in items:
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for i in item[self.media_key]:
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self.assertEqual(i['status'], 'downloaded')
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# check that the images/files checksums are what we know they should be
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if self.expected_checksums is not None:
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checksums = set(
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i['checksum']
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for item in items
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for i in item[self.media_key]
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)
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self.assertEqual(checksums, self.expected_checksums)
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# check that the image files where actually written to the media store
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for item in items:
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for i in item[self.media_key]:
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self.assertTrue((self.tmpmediastore / i['path']).exists())
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def _assert_files_download_failure(self, crawler, items, code, logs):
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# check that the item does NOT have the "images/files" field populated
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self.assertEqual(len(items), 1)
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self.assertIn(self.media_key, items[0])
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self.assertFalse(items[0][self.media_key])
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# check that there was 1 successful fetch and 3 other responses with non-200 code
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self.assertEqual(crawler.stats.get_value('downloader/request_method_count/GET'), 4)
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self.assertEqual(crawler.stats.get_value('downloader/response_count'), 4)
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self.assertEqual(crawler.stats.get_value('downloader/response_status_count/200'), 1)
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self.assertEqual(crawler.stats.get_value(f'downloader/response_status_count/{code}'), 3)
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# check that logs do show the failure on the file downloads
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file_dl_failure = f'File (code: {code}): Error downloading file from'
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self.assertEqual(logs.count(file_dl_failure), 3)
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# check that no files were written to the media store
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self.assertEqual([x for x in self.tmpmediastore.iterdir()], [])
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@defer.inlineCallbacks
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def test_download_media(self):
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crawler = self._create_crawler(MediaDownloadSpider)
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with LogCapture() as log:
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yield crawler.crawl(
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self.mockserver.url("/files/images/"),
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media_key=self.media_key,
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media_urls_key=self.media_urls_key)
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self._assert_files_downloaded(self.items, str(log))
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@defer.inlineCallbacks
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def test_download_media_wrong_urls(self):
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crawler = self._create_crawler(BrokenLinksMediaDownloadSpider)
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with LogCapture() as log:
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yield crawler.crawl(
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self.mockserver.url("/files/images/"),
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media_key=self.media_key,
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media_urls_key=self.media_urls_key)
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self._assert_files_download_failure(crawler, self.items, 404, str(log))
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@defer.inlineCallbacks
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def test_download_media_redirected_default_failure(self):
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crawler = self._create_crawler(RedirectedMediaDownloadSpider)
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with LogCapture() as log:
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yield crawler.crawl(
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self.mockserver.url("/files/images/"),
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media_key=self.media_key,
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media_urls_key=self.media_urls_key,
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mockserver=self.mockserver)
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self._assert_files_download_failure(crawler, self.items, 302, str(log))
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@defer.inlineCallbacks
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def test_download_media_redirected_allowed(self):
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settings = dict(self.settings)
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settings.update({'MEDIA_ALLOW_REDIRECTS': True})
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runner = CrawlerRunner(settings)
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crawler = self._create_crawler(RedirectedMediaDownloadSpider, runner=runner)
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with LogCapture() as log:
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yield crawler.crawl(
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self.mockserver.url("/files/images/"),
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media_key=self.media_key,
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media_urls_key=self.media_urls_key,
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mockserver=self.mockserver)
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self._assert_files_downloaded(self.items, str(log))
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self.assertEqual(crawler.stats.get_value('downloader/response_status_count/302'), 3)
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try:
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from PIL import Image # noqa: imported just to check for the import error
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except ImportError:
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skip_pillow = 'Missing Python Imaging Library, install https://pypi.python.org/pypi/Pillow'
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else:
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skip_pillow = None
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class ImageDownloadCrawlTestCase(FileDownloadCrawlTestCase):
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skip = skip_pillow
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pipeline_class = 'scrapy.pipelines.images.ImagesPipeline'
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store_setting_key = 'IMAGES_STORE'
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media_key = 'images'
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media_urls_key = 'image_urls'
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# somehow checksums for images are different for Python 3.3
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expected_checksums = None
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