139 lines
5.1 KiB
Python
139 lines
5.1 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2004-2005 Tristan Seligmann and Jonathan Jacobs
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# Copyright (C) 2012-2013 Bastian Kleineidam
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import tempfile
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import shutil
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import re
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import os
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import multiprocessing
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import urlparse
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from itertools import islice
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from unittest import TestCase
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from dosagelib import scraper
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def get_host(url):
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"""Get host part of URL."""
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return urlparse.urlsplit(url)[1].lower()
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# Dictionary with per-host locks.
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_locks = {}
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# Allowed number of connections per host
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MaxConnections = 4
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def get_lock(host):
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"""Get bounded semphore for given host."""
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if host not in _locks:
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_locks[host] = multiprocessing.BoundedSemaphore(MaxConnections)
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return _locks[host]
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class _ComicTester(TestCase):
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"""Basic comic test class."""
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scraperclass=None
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def setUp(self):
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self.name = self.scraperclass.getName()
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self.url = self.scraperclass.starter()
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# create a temporary directory for images
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self.tmpdir = tempfile.mkdtemp()
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def tearDown(self):
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shutil.rmtree(self.tmpdir)
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def get_saved_images(self):
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"""Get saved images."""
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dirs = tuple(self.name.split('/'))
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return os.listdir(os.path.join(self.tmpdir, *dirs))
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def test_comic(self):
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# Test a scraper. It must be able to traverse backward for
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# at least 5 strips from the start, and find strip images
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# on at least 4 pages.
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scraperobj = self.scraperclass()
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# Limit number of connections to one host.
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host = get_host(scraperobj.url)
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try:
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with get_lock(host):
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self._test_comic(scraperobj)
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except OSError:
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# interprocess lock not supported
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self._test_comic(scraperobj)
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def _test_comic(self, scraperobj):
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num = 0
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max_strips = 5
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for strip in scraperobj.getStrips(max_strips):
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images = []
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for image in strip.getImages():
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images.append(image.url)
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self.save(image)
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self.check(images, 'failed to find images at %s' % strip.stripUrl)
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if not self.scraperclass.multipleImagesPerStrip:
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self.check(len(images) == 1, 'found more than 1 image at %s: %s' % (strip.stripUrl, images))
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if num > 0 and self.scraperclass.prevUrlMatchesStripUrl:
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self.check_stripurl(strip)
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num += 1
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if self.scraperclass.prevSearch:
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self.check(num > 0, 'no strips found')
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if not scraperobj.hitFirstStripUrl:
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self.check_scraperesult(max_strips, num, strip, scraperobj)
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def check_scraperesult(self, max_strips, num, strip, scraperobj):
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self.check(num >= 4, 'traversal failed after %d strips, check the prevSearch pattern at %s.' % (num, strip.stripUrl))
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# Check that exactly or for multiple pages at least 5 images are saved.
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# This is different than the image number check above since it checks saved files,
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# ie. it detects duplicate filenames.
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saved_images = self.get_saved_images()
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num_images = len(saved_images)
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# subtract the number of skipped URLs with no image from the expected image number
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num_images_expected = max_strips - len(scraperobj.skippedUrls)
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attrs = (num_images, saved_images, num_images_expected, self.tmpdir)
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if self.scraperclass.multipleImagesPerStrip:
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self.check(num_images >= num_images_expected, 'saved %d %s instead of at least %d images in %s' % attrs)
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else:
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self.check(num_images == num_images_expected, 'saved %d %s instead of %d images in %s' % attrs)
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def check_stripurl(self, strip):
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if not self.scraperclass.stripUrl:
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# no indexing support
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return
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# test that the stripUrl regex matches the retrieved strip URL
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urlmatch = re.escape(self.scraperclass.stripUrl)
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urlmatch = urlmatch.replace(r"\%s", r".+")
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urlmatch = "^%s$" % urlmatch
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ro = re.compile(urlmatch)
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mo = ro.search(strip.stripUrl)
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self.check(mo is not None, 'strip URL %r does not match stripUrl pattern %s' % (strip.stripUrl, urlmatch))
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def save(self, image):
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try:
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image.save(self.tmpdir)
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except Exception as msg:
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self.check(False, 'could not save %s at %s to %s: %s' % (image.url, image.referrer, self.tmpdir, msg))
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def check(self, condition, msg):
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self.assertTrue(condition, "%s %s %s" % (self.name, self.url, msg))
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def make_comic_tester(name, **kwargs):
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"""Create and return a _ComicTester class with given name and attributes."""
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return type(name, (_ComicTester,), kwargs)
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def generate_comic_testers():
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"""For each comic scraper, create a test class."""
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g = globals()
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if "TESTALL" not in os.environ:
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# Get limited number of scraper tests on Travis builds.
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max_scrapers = 1
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scraperclasses = islice(scraper.get_scraperclasses(), 0, max_scrapers)
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else:
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scraperclasses = scraper.get_scraperclasses()
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for scraperclass in scraperclasses:
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name = 'Test'+scraperclass.__name__
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g[name] = make_comic_tester(name, scraperclass=scraperclass)
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generate_comic_testers()
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