130 lines
4.7 KiB
Python
130 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2004-2005 Tristan Seligmann and Jonathan Jacobs
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# Copyright (C) 2012-2014 Bastian Kleineidam
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# Copyright (C) 2015 Tobias Gruetzmacher
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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 pytest
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try:
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from urllib.parse import urlsplit
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except ImportError:
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from urlparse import urlsplit
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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 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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@pytest.yield_fixture
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def tmpdir():
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tmpdir = tempfile.mkdtemp()
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yield tmpdir
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shutil.rmtree(tmpdir)
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def get_saved_images(tmpdir, scraper, filtertxt=False):
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"""Get saved images."""
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dirs = tuple(scraper.getName().split('/'))
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files = os.listdir(os.path.join(tmpdir, *dirs))
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if filtertxt:
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files = [x for x in files if not x.endswith(".txt")]
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return files
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def test_comicmodule(tmpdir, scraperclass):
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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 = 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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_test_comic(tmpdir, scraperobj)
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except OSError:
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# interprocess lock not supported
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_test_comic(tmpdir, scraperobj)
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def _test_comic(tmpdir, scraperobj):
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num_strips = 0
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max_strips = 5
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strip = None
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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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image.save(tmpdir)
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assert images, 'failed to find images at %s' % strip.stripUrl
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if not scraperobj.multipleImagesPerStrip:
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assert len(images) == 1, 'found more than 1 image at %s: %s' % (strip.stripUrl, images)
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if num_strips > 0 and scraperobj.prevUrlMatchesStripUrl:
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check_stripurl(strip, scraperobj)
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num_strips += 1
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if scraperobj.prevSearch and not scraperobj.hitFirstStripUrl:
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# check strips
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num_strips_expected = max_strips - len(scraperobj.skippedUrls)
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msg = 'Traversed %d strips instead of %d.' % (num_strips, num_strips_expected)
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if strip:
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msg += " Check the prevSearch pattern at %s" % strip.stripUrl
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assert num_strips == num_strips_expected, msg
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# check images
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if strip:
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check_scraperesult(tmpdir, num_strips_expected, strip, scraperobj)
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def check_scraperesult(tmpdir, num_images_expected, strip, scraperobj):
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# Check that exactly or for multiple pages at least num_strips images are saved.
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# This checks saved files, ie. it detects duplicate filenames.
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saved_images = get_saved_images(tmpdir, scraperobj, filtertxt=bool(scraperobj.textSearch))
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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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attrs = (num_images, saved_images, num_images_expected, tmpdir)
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if scraperobj.multipleImagesPerStrip:
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assert 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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assert num_images == num_images_expected, 'saved %d %s instead of %d images in %s' % attrs
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def check_stripurl(strip, scraperobj):
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if not scraperobj.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(scraperobj.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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assert mo is not None, 'strip URL %r does not match stripUrl pattern %s' % (strip.stripUrl, urlmatch)
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def get_test_scraperclasses():
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"""Return scrapers that should be tested."""
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if "TESTALL" in os.environ:
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# test all comics (this will take some time)
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scraperclasses = scraper.get_scraperclasses()
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else:
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# Get limited number of scraper tests on Travis builds to make
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# it faster
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testscrapernames = ['AbstruseGoose', 'GoComics/CalvinandHobbes', 'xkcd']
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scraperclasses = [
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scraperclass for scraperclass in scraper.get_scraperclasses()
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if scraperclass.getName() in testscrapernames
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]
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return scraperclasses
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def pytest_generate_tests(metafunc):
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if 'scraperclass' in metafunc.fixturenames:
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metafunc.parametrize('scraperclass', get_test_scraperclasses())
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