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Google metadata plugin: When searching by ISBN if no results are found retry using an alternate query syntax. Fixes #1531 (Google books metadata plugin: Workaround for API bug)

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Kovid Goyal 2021-11-14 17:45:37 +05:30
parent 85a7df7daa
commit f7452f5211
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1 changed files with 51 additions and 24 deletions
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75
src/calibre/ebooks/metadata/sources/google.py
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@ -176,11 +176,11 @@ def to_metadata(browser, log, entry_, timeout): # {{{
class GoogleBooks(Source):
name = 'Google'
version = (1, 0, 2)
version = (1, 0, 3)
minimum_calibre_version = (2, 80, 0)
description = _('Downloads metadata and covers from Google Books')
capabilities = frozenset({'identify', 'cover'})
capabilities = frozenset({'identify'})
touched_fields = frozenset({
'title', 'authors', 'tags', 'pubdate', 'comments', 'publisher',
'identifier:isbn', 'identifier:google', 'languages'
@ -201,7 +201,7 @@ class GoogleBooks(Source):
# }}}
def create_query(self, log, title=None, authors=None, identifiers={}): # {{{
def create_query(self, title=None, authors=None, identifiers={}, capitalize_isbn=False): # {{{
try:
from urllib.parse import urlencode
except ImportError:
@ -210,7 +210,7 @@ class GoogleBooks(Source):
isbn = check_isbn(identifiers.get('isbn', None))
q = ''
if isbn is not None:
q += 'isbn:' + isbn
q += ('ISBN:' if capitalize_isbn else 'isbn:') + isbn
elif title or authors:
def build_term(prefix, parts):
@ -360,28 +360,39 @@ class GoogleBooks(Source):
entry = XPath('//atom:entry')
query = self.create_query(
log, title=title, authors=authors, identifiers=identifiers
title=title, authors=authors, identifiers=identifiers
)
if not query:
log.error('Insufficient metadata to construct query')
return
alternate_query = self.create_query(title=title, authors=authors, identifiers=identifiers, capitalize_isbn=True)
br = self.browser
log('Making query:', query)
try:
raw = br.open_novisit(query, timeout=timeout).read()
except Exception as e:
log.exception('Failed to make identify query: %r' % query)
return as_unicode(e)
try:
feed = etree.fromstring(
xml_to_unicode(clean_ascii_chars(raw), strip_encoding_pats=True)[0],
parser=etree.XMLParser(recover=True, no_network=True, resolve_entities=False)
)
entries = entry(feed)
except Exception as e:
log.exception('Failed to parse identify results')
return as_unicode(e)
def make_query(query):
log('Making query:', query)
try:
raw = br.open_novisit(query, timeout=timeout).read()
except Exception as e:
log.exception('Failed to make identify query: %r' % query)
return False, as_unicode(e)
try:
feed = etree.fromstring(
xml_to_unicode(clean_ascii_chars(raw), strip_encoding_pats=True)[0],
parser=etree.XMLParser(recover=True, no_network=True, resolve_entities=False)
)
return True, entry(feed)
except Exception as e:
log.exception('Failed to parse identify results')
return False, as_unicode(e)
ok, entries = make_query(query)
if not ok:
return entries
if not entries and alternate_query != query and not abort.is_set():
log('No results found, retrying with capitalized ISBN')
ok, entries = make_query(alternate_query)
if not ok:
return entries
if not entries and title and not abort.is_set():
if identifiers:
@ -419,7 +430,19 @@ if __name__ == '__main__': # tests {{{
from calibre.ebooks.metadata.sources.test import (
test_identify_plugin, title_test, authors_test
)
tests = [({
tests = [
({
'identifiers': {
'isbn': '978-0-7869-5437-7' # needs capitalized ISBN to find results
},
'title': 'Dragons of Autumn Twilight',
'authors': ['Margaret Weis', 'Tracy Hickman']
}, [
title_test('The great gatsby', exact=True),
authors_test(['F. Scott Fitzgerald'])
]),
({
'identifiers': {
'isbn': '0743273567'
},
@ -428,14 +451,18 @@ if __name__ == '__main__': # tests {{{
}, [
title_test('The great gatsby', exact=True),
authors_test(['F. Scott Fitzgerald'])
]), ({
]),
({
'title': 'Flatland',
'authors': ['Abbott']
}, [title_test('Flatland', exact=False)]), ({
}, [title_test('Flatland', exact=False)]),
({
'title':
'The Blood Red Indian Summer: A Berger and Mitry Mystery',
'authors': ['David Handler'],
}, [title_test('The Blood Red Indian Summer: A Berger and Mitry Mystery')])]
}, [title_test('The Blood Red Indian Summer: A Berger and Mitry Mystery')
])
]
test_identify_plugin(GoogleBooks.name, tests[:])
# }}}