electric_dart
yjs-pg-test
electric_dart | yjs-pg-test | |
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2 | 2 | |
84 | 6 | |
- | - | |
9.7 | 2.5 | |
8 days ago | about 1 year ago | |
Dart | TypeScript | |
Apache License 2.0 | - |
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electric_dart
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Show HN: ElectricSQL, Postgres to SQLite active-active sync for local-first apps
Hey, yup it's definitely a medium term objective.
The team at SkillDevs are maintaining a Daft/Flutter client at https://github.com/SkillDevs/electric_dart
Plus we have a thread to extract the core client-side replication component to Rust to be able to compile for multiple targets.
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CRDT-richtext: Rust implementation of Peritext and Fugue
We (ElectricSQL) have some work underway on a Rust/WASM port of our core client component, that’s designed to open up more language support.
This is a community contributed Dart/Flutter client https://github.com/SkillDevs/electric_dart that may also be a useful reference.
yjs-pg-test
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CRDT-richtext: Rust implementation of Peritext and Fugue
I agree that full stack support is the missing pice that's need to make use explode. But I do think the current implementations will get there.
CRDTs are fairly unique in that you need them to be exposed very close to the front of your stack in order to capture user intent, but you also need support further back in your stack for merging, replication, and querying.
We have good front end support and there are multiple exciting projects building collaboration servers for them. What I think is missing is support in database, that's what I've been experimenting with (below). If you are building an offline enabled app, having the ability to generate diffs and merge in database enables easy multi document sync.
Also most general purpose CRDTs are a combination of JSON and XML like data structures, it's useful to be able to query the structures in your database. For example if you build a notes app that supports inline tags, if useful to be able to query and index those from within the XML like structure without having to dump the whole thing out at another layer of your stack.
Yjs Postgres: https://github.com/samwillis/yjs-pg-test
Yjs SQLite: https://github.com/samwillis/yjs-sqlite-test
(These are just early experiments, I'm working on a cleaner shared implementation with support for various SQLite bindings, and better querying)
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Ask HN: What Are You Working On? (May 2023)
Day job (contract): Massive overhaul of an antibody workbench for drug discovery.
Evenings: Building out a concept for a "YSQL" bringing CRDTs (Yjs) to SQLite and Postgres. CRDTs are great for real-time, but also awesome for offline for async collaboration. Using the same CRDT for both front end data structures and backend database merging seems to me to be a good combination. The plan is to build out some simple primitives first, then layer a SQLite (WASM in browser) <-> Postgres sync system on top for local copying and modification of datasets.
Proof of concepts:
https://github.com/samwillis/yjs-sqlite-test
https://github.com/samwillis/yjs-pg-test
What are some alternatives?
fugue-bench - Fugue list CRDT implementations and benchmarks
electric - Local-first sync layer for web and mobile apps. Build reactive, realtime, local-first apps directly on Postgres.
pg_crdt - POC CRDT support in Postgres
vaxine - Rich-CRDT database based on AntidoteDB.
jnigen - Experimental bindings generator for Java bindings through dart:ffi and JNI.
eventually-consistent-mesh - an attempt to create an asynchronously replicated append only eventually consistent data protocol
rdom - Server side reactive DOM updates in Ruby
crdt-benchmarks - Real world text editing traces for benchmarking CRDT and Rope data structures [Moved to: https://github.com/josephg/editing-traces]
text-diff - a python implementation of diff3 and three way merge