def test_failed_without_overwriting(tempdir):
"""AtomicWriter: Exception after writing won't overwrite the old file"""
p = _settings(tempdir)
mockSettings = {}
def write():
with atomic_writer(p, 'wb') as fp:
json.dump(mockSettings, fp)
raise Exception()
with atomic_writer(p, 'wb') as fp:
json.dump(DEFAULT_SETTINGS, fp)
assert len(os.listdir(tempdir)) == 1
assert os.path.exists(p)
with pytest.raises(Exception):
write()
assert len(os.listdir(tempdir)) == 1
assert os.path.exists(p)
with open(p, 'rb') as fp:
real_settings = json.load(fp)
assert DEFAULT_SETTINGS == real_settings
def process_queue(self):
"""Generate thumbnails for queued files."""
if not self.has_queue:
log.debug('Thumbnail queue empty.')
return
queue = []
with LockFile(self._queue_path):
with open(self._queue_path) as fp:
for line in fp:
line = line.strip()
if not line:
continue
if not os.path.exists(line):
log.debug('File does not exist : %r', line)
continue
queue.append(line)
# Clear queue file
with atomic_writer(self._queue_path, 'wb') as fp:
fp.write('')
succeeded = True
for i, img_path in enumerate(queue):
log.debug('Generating thumbnail {}/{} ...', i + 1, len(queue))
if not self.generate_thumbnail(img_path):
succeeded = False
return succeeded
def test_write_file_succeed(tempdir):
"""Succeed, no temp file left"""
p = _settings(tempdir)
with atomic_writer(p, 'wb') as fp:
json.dump(DEFAULT_SETTINGS, fp)
assert len(os.listdir(tempdir)) == 1
assert os.path.exists(p)
def save_queue(self):
"""Save queued files."""
if not self._queue:
return
text = []
for p in self._queue:
if isinstance(p, unicode):
p = p.encode('utf-8')
text.append(p)
log.debug('Queued for thumbnail generation : %r', p)
text = b'\n'.join(text)
with LockFile(self._queue_path):
with atomic_writer(self._queue_path, 'ab') as fp:
fp.write(b'{}\n'.format(text))
self._queue = []
def write():
with atomic_writer(p, 'wb') as fp:
json.dump(mockSettings, fp)
raise Exception()
def write():
with atomic_writer(p, 'wb') as fp:
json.dump(DEFAULT_SETTINGS, fp)
raise Exception()
def write():
with atomic_writer(p, 'wb'):
raise Exception()
