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Handle case where cache file does not exist.

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This commit is contained in:
Charles Haley 2013-10-11 15:06:18 +02:00
parent 5572db6fde
commit e599f82f1e
1 changed files with 21 additions and 20 deletions
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41
src/calibre/devices/smart_device_app/driver.py
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@ -730,27 +730,28 @@ class SMART_DEVICE_APP(DeviceConfig, DevicePlugin):
'_metadata_cache.json')
self.known_uuids = defaultdict(dict)
self.known_metadata = {}
with open(cache_file_name, mode='rb') as fd:
try:
while True:
rec_len = fd.readline()
if len(rec_len) != 8:
break
raw = fd.read(int(rec_len))
book = json.loads(raw.decode('utf-8'), object_hook=from_json)
uuid = book.keys()[0]
metadata = self.json_codec.raw_to_book(book[uuid]['book'],
SDBook, self.PREFIX)
book[uuid]['book'] = metadata
self.known_uuids.update(book)
if os.path.exists(cache_file_name):
with open(cache_file_name, mode='rb') as fd:
try:
while True:
rec_len = fd.readline()
if len(rec_len) != 8:
break
raw = fd.read(int(rec_len))
book = json.loads(raw.decode('utf-8'), object_hook=from_json)
uuid = book.keys()[0]
metadata = self.json_codec.raw_to_book(book[uuid]['book'],
SDBook, self.PREFIX)
book[uuid]['book'] = metadata
self.known_uuids.update(book)
lpath = metadata.get('lpath')
if lpath in self.known_metadata:
self.known_uuids.pop(uuid, None)
else:
self.known_metadata[lpath] = metadata
except:
traceback.print_exc()
lpath = metadata.get('lpath')
if lpath in self.known_metadata:
self.known_uuids.pop(uuid, None)
else:
self.known_metadata[lpath] = metadata
except:
traceback.print_exc()
def _write_metadata_cache(self):
from calibre.utils.config import to_json