def _get_from_store(context, where, dest=None):
try:
loc = glance_store.location.get_location_from_uri(where)
src_store = store.get_store_from_uri(where)
if dest is not None:
src_store.READ_CHUNKSIZE = dest.WRITE_CHUNKSIZE
image_data, image_size = src_store.get(loc, context=context)
except exception.NotFound as e:
raise HTTPNotFound(explanation=e.msg)
image_size = int(image_size) if image_size else None
return image_data, image_size
