dosage/tests/modules/check_comics.py

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# -*- coding: utf-8 -*-
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# Copyright (C) 2004-2008 Tristan Seligmann and Jonathan Jacobs
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# Copyright (C) 2012-2014 Bastian Kleineidam
# Copyright (C) 2015-2018 Tobias Gruetzmacher
from __future__ import absolute_import, division, print_function
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import re
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import multiprocessing
from six.moves.urllib.parse import urlsplit
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def get_host(url):
"""Get host part of URL."""
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return urlsplit(url)[1].lower()
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# Dictionary with per-host locks.
_locks = {}
# Allowed number of connections per host
MaxConnections = 4
# Maximum number of strips to get to test a comic
MaxStrips = 5
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def get_lock(host):
"""Get bounded semphore for given host."""
if host not in _locks:
_locks[host] = multiprocessing.BoundedSemaphore(MaxConnections)
return _locks[host]
def test_comicmodule(tmpdir, scraperobj):
'''Test a scraper. It must be able to traverse backward for at least 5
strips from the start, and find strip images on at least 4 pages.'''
# Limit number of connections to one host.
host = get_host(scraperobj.url)
try:
with get_lock(host):
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_test_comic(str(tmpdir), scraperobj)
except OSError:
# interprocess lock not supported
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_test_comic(str(tmpdir), scraperobj)
def _test_comic(outdir, scraperobj):
num_strips = 0
strip = None
files = []
for strip in scraperobj.getStrips(MaxStrips):
files.append(_check_strip(outdir, strip,
scraperobj.multipleImagesPerStrip))
if num_strips > 0:
_check_stripurl(strip, scraperobj)
num_strips += 1
if scraperobj.prevSearch and not scraperobj.hitFirstStripUrl:
# subtract the number of skipped URLs with no image from the expected
# image number
num_strips_expected = MaxStrips - len(scraperobj.skippedUrls)
msg = 'Traversed %d strips instead of %d.' % (num_strips,
num_strips_expected)
if strip:
msg += " Check the prevSearch pattern at %s" % strip.strip_url
assert num_strips == num_strips_expected, msg
if strip:
_check_scraperesult(files, num_strips_expected, strip, scraperobj)
def _check_strip(outdir, strip, multipleImagesPerStrip):
'''Check that a specific page yields images and the comic module correctly
declares if there are multiple images per page.'''
images = []
files = []
for image in strip.getImages():
images.append(image.url)
# write a fake image (to download less)
fakeimg = image._fnbase(outdir) + '.fake'
with open(fakeimg, 'w') as f:
f.write("fake image for testing")
fn, _ = image.save(outdir)
files.append(fn)
assert images, 'failed to find images at %s' % strip.strip_url
if not multipleImagesPerStrip:
assert len(images) == 1, 'found more than 1 image at {}: {}'.format(
strip.strip_url, images)
return files
def _check_scraperesult(saved_images, num_images_expected, strip, scraperobj):
'''Check that exactly or for multiple pages at least num_strips images are
saved. This checks saved files, ie. it detects duplicate filenames.'''
num_images = len(saved_images)
attrs = (num_images, saved_images, num_images_expected)
if scraperobj.multipleImagesPerStrip:
err = 'saved %d %s instead of at least %d images' % attrs
assert num_images >= num_images_expected, err
else:
err = 'saved %d %s instead of %d images' % attrs
assert num_images == num_images_expected, err
def _check_stripurl(strip, scraperobj):
if not scraperobj.stripUrl:
# no indexing support
return
# test that the stripUrl regex matches the retrieved strip URL
urlmatch = re.escape(scraperobj.stripUrl)
urlmatch = urlmatch.replace(r"\%s", r".+")
urlmatch = "^%s$" % urlmatch
ro = re.compile(urlmatch)
mo = ro.search(strip.strip_url)
err = 'strip URL {!r} does not match stripUrl pattern {}'.format(
strip.strip_url, urlmatch)
assert mo is not None, err