Day26 Lab 2 - Object storage 上传续传

https://github.com/kaichiachen/python-simple-object-storage/blob/master/distributed_obj_system/frontend.py#L40

API层如下所示

if start == 0:
   f = open(os.path.join(DIR_PATH, hash), 'wb')
else:
   f = open(os.path.join(DIR_PATH, hash), 'ab')
f.write(obj)
f.close()

if start+length >= filesize:
   # object upload completed...

https://github.com/kaichiachen/python-simple-object-storage/blob/master/distributed_obj_system/backend/api/run.py#L71

我们可以看到如果是上传，前端需要传递更多参数 - start, length, filesize，当start+length ≥ filesize才代表上传完成，由於object一般很大，不可能一直存在记忆体并且一直append，所以我们会把正在upload的东西存成档案，等到upload完成再一次读到记忆体