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Improve downloading of covers from the google books metadata source

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This commit is contained in:
Kovid Goyal 2017-02-28 14:19:19 +05:30
parent b5010e7060
commit c525f5587f
1 changed files with 19 additions and 14 deletions
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33
src/calibre/ebooks/metadata/sources/google.py
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@ -59,6 +59,7 @@ def to_metadata(browser, log, entry_, timeout): # {{{
description = XPath('descendant::dc:description')
language = XPath('descendant::dc:language')
rating = XPath('descendant::gd:rating[@average]')
# print(etree.tostring(entry_, pretty_print=True))
def get_text(extra, x):
try:
@ -170,14 +171,14 @@ class GoogleBooks(Source):
capabilities = frozenset({'identify', 'cover'})
touched_fields = frozenset({
'title', 'authors', 'tags', 'pubdate', 'comments', 'publisher',
'identifier:isbn', 'rating', 'identifier:google', 'languages'
'identifier:isbn', 'identifier:google', 'languages'
})
supports_gzip_transfer_encoding = True
cached_cover_url_is_reliable = False
GOOGLE_COVER = 'https://books.google.com/books?id=%s&printsec=frontcover&img=1'
DUMMY_IMAGE_MD5 = frozenset({'0de4383ebad0adad5eeb8975cd796657'})
DUMMY_IMAGE_MD5 = frozenset({'0de4383ebad0adad5eeb8975cd796657', 'a64fa89d7ebc97075c1d363fc5fea71f'})
def get_book_url(self, identifiers): # {{{
goog = identifiers.get('google', None)
@ -262,19 +263,22 @@ class GoogleBooks(Source):
log.info('No cover found')
return
if abort.is_set():
return
br = self.browser
log('Downloading cover from:', cached_url)
try:
cdata = br.open_novisit(cached_url, timeout=timeout).read()
if cdata:
if hashlib.md5(cdata).hexdigest() in self.DUMMY_IMAGE_MD5:
log.warning('Google returned a dummy image, ignoring')
else:
result_queue.put((self, cdata))
except:
log.exception('Failed to download cover from:', cached_url)
for candidate in (0, 1):
if abort.is_set():
return
url = cached_url + '&zoom={}'.format(candidate)
log('Downloading cover from:', cached_url)
try:
cdata = br.open_novisit(url, timeout=timeout).read()
if cdata:
if hashlib.md5(cdata).hexdigest() in self.DUMMY_IMAGE_MD5:
log.warning('Google returned a dummy image, ignoring')
else:
result_queue.put((self, cdata))
break
except Exception:
log.exception('Failed to download cover from:', cached_url)
# }}}
@ -406,4 +410,5 @@ if __name__ == '__main__': # tests {{{
}, [title_test('Flatland', exact=False)]),
]
)
# }}}