def _read_range(self, start, end):
# TODO: make this method thread safe
assert start <= end, "start should less than end"
try:
logger.info('trigger read_func(%d, %d)', start, end)
objs = self._read_func(start, end)
except: # noqa: E722
raise ReadFailed('read_func raise error')
else:
expected = end - start
actual = len(objs)
if expected != actual:
raise ReadFailed(
'read_func returns unexpected number of objects: '
'expected={}, actual={}'.format(expected, actual))
self._objects[start:end] = objs
self._refresh_ranges()
def readall(self):
if self.count is None:
raise ReadFailed("can't readall when count is unknown")
list(self)
return self._objects