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Intro

rac-delta is an universal differential protocol designed to sync and distribute builds (like games, apps or directories) efficiently and storage agnostic. It allows to detect and transfer only modified file fragments, minimizing band width, load times and disk operations.

Benefits of using rac-delta​

  • Backend agnostic: it does not depend on a concrete service (S3, Azure, SSH, signed URLs, etc.)
  • Modular: almost any remote storage can be used via adapters
  • Simple: an unique index archive (rd-index.json) centralices all information.
  • Efficiency: supports streaming, concurrency, and uses Blake3 for fast hashing.
  • Flexibility: highly customizable, chunk size, concurrency limits, reconstruction strategies...

Philosophy​

rac-delta is an open protocol, anyone can make their own implementations of the protocol using the core section as a guide. In any case, there exist JavaScript and Rust implementations that are also open source and the recommended way to use rac-delta for those languages.

Why is it called rac-delta​

rac-delta was created for Raccreative Games (an indie games platform), it was a need for the platform as differential uploads and downloads were about to be implemented. This led to the creation of rac-delta and we thought it would be good for the community to create something everyone could use.

TL;DR: rac is for raccoon! The official Raccreative Games mascot.