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初步流程:
选择上传文件 -> 提取md5 -> 请求后端校验此md5的文件是否已经上传过 -> 如果有上传就返回信息告诉前端上传完成(秒传) ->
如果没有则根据此md5获取已上传的分片有哪些,未上传的分片有多少个就返回多少个上传url
如何获取已上传的分片有哪些呢?
minio
api有一个生成上传url的api,这个api可以指定接下来要上传文件的文件名,也就是说,在上传步骤,我们只要保证上传的分片文件是有规则的,那么我们就可以很轻松的获取到
举个例子:上传文件的大小为10m,分片2个,md5为 asdfghjkl,则我们生成2个上传url,每个url指定的文件名为
md5/分片序号.chunk(分片文件要不要文件后缀都可以) 的格式,也就是 asdfghjkl/1.chunk;asdfghjkl/2.chunk
所有分片文件上传完成后,通过 listObjects 获取到 asdfghjkl前缀开头的所有文件,即是所有分片文件的path,最后合并文件即可
为什么不所有步骤都采用前端直连Minio?毕竟官方的sdk也提供了前端的示例
这样做会直接暴露有关于minio的敏感信息,并且不管怎样,始终也需要后端去记录最终文件上传完成后的信息,所以一些敏感的操作,还是由后端程序来协助
这个流程的好处:
省掉每个分片的md5计算
省掉每上传一个分片文件就请求后端记录一次分片信息
省掉每个分片的数据库存储,合并文件后只需要删除分片文件,不需要再删除数据库数据
可以并发上传
文件上传直连于minio服务,不经过后端程序
分片文件更方便管理,比如分片文件上传到一个B桶里,合