automerge/rust/automerge-wasm/examples/redis-sync

Quick Example of Syncing Automerge Docs via Redis

The good:

1. store the document in redis as both a compacted document save and as individual changes
2. able to load the the saved document, and then calculate which changes are missing in a single pass
3. uses redis (RPUSH) to get global change ordering
4. wake all clients on new changes with redis (PUBLISH, SUBSCRIBE)
5. elect (via SETNX) a single leader to saveIncremental() every 10 seconds
6. said node also does a full doc save when incremental bytes are 10x the base save
7. detects disconnection of the leader (via EXPIRE) and elects a new leader
8. detects when a document has not been created and elects a single node to create it

The bad:

1. redis can do binary data - i couldnt figure it out - i hex encode/decode everything
2. there's probably a few race conditions i need to find
3. my typescript is ass
4. not much in the way of error handling
5. should really be using applyPatches() but im not
6. the api is a little funny

How to use:

$ yarn
$ yarn build

Then run

$ node client.js $DOCID

In two or three different windows and watch each client editing the same document.