🚨⚠️ No longer in development, for similar use cases (and using the same basic approach) take a look at https://github.com/atom/teletype-crdt. It also passes the edge-case described in the TODO section. ⚠️🚨

Rgass.js

A JS implementation of RGASS, a CRDT synchronization algorithm presented in research paper by Xiao Lv et al: http://dx.doi.org/10.1016/j.aei.2016.10.005.

Getting started

This module is still experimental, but it's easy to play with it already:

1. Clone this repository and
2. npm install, then
3. npm start
4. and open at least two browser windows pointing to localhost:3000.

Now you can test its collaborative text editing functionality. There is also a battletest (see below) that will automatically add and delete strings in two text areas concurrently and raise an error if there is a mismatch, as a way to fuzz test the algorithm.

To run tests

npm test

To run battletest

npm run battletest

TODO

• [ ] Resolve issue with overlapping concurrent insertions and deletions, that the algorihtm described in the paper doesn't address (there is a currently failing test describing the above scenario).
• [ ] Serialization of Model
• [ ] Snapshotting (related to above)
• [ ] More bulletproofing