electric_dart
walex
electric_dart | walex | |
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2 | 17 | |
84 | 256 | |
- | - | |
9.7 | 9.1 | |
8 days ago | 14 days ago | |
Dart | Elixir | |
Apache License 2.0 | MIT License |
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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.
walex
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The Guide to PostgreSQL Data Change Tracking
The WAL CDC approach: https://github.com/cpursley/walex?tab=readme-ov-file#publica...
CREATE PUBLICATION news_item FOR TABLE news WHERE (topic IS "AAPL");
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Elixir Nitpicks
What do you mean testing with processes?
I won't suggest these are the best written tests, but I test various processes, supervisors, etc like this:
https://github.com/cpursley/walex/blob/master/test/walex/sup...
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PostgreSQL Is Enough
You don’t send the entire WAL, just what you subscribe to - and you can even filter via SQL: https://github.com/cpursley/walex?tab=readme-ov-file#publica...
- A Technical Dive into PostgreSQL's replication mechanisms
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Fly Postgres, Managed by Supabase
What we do is much if the business logic in Postgres. But then there’s all the other stuff like external integrations, etc.
We handled that by having an Even system built on the Postgres WAL that we use like a callback system.
I put together a little library in Elixir (that originally started out as forked Supabase realtime) for this:
https://github.com/cpursley/walex
Recently added the ability to configure WalEx to forward events to webhooks or EventRelay (so you don’t need to know Elixir).
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All the ways to capture changes in Postgres
If you're using Elixir, check out https://github.com/cpursley/walex
I've actually been thinking about turning this idea into a product where you can just point it at your postgres database and select the tables you want to listen to (with filters, like you describe). And have that forwarded to a webhook (with possibility of other protocols).
I'd love to hear folks thoughts on that (and if it would be something people would pay for).
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Show HN: ElectricSQL, Postgres to SQLite active-active sync for local-first apps
Neat, this is the pattern I've been thinking about for a while now. Also glad to see this is Elixir based.
I've been using https://github.com/cpursley/walex (basically a fork of cainophile via a fork for subabase) to listen to Postgres changes in Elixir.
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How to Listen to Database Changes Using Postgres Triggers in Elixir
https://github.com/cpursley/walex
Which is based on WAL logs and doesnt have the same limitations.
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PostgreSQL Logical Replication Gotchas
Great writeup, just added this to the WalEx readme:
https://github.com/cpursley/walex
(WalEx is an Elixir lib for listening to the WAL and perform callback-like actions with the data)
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We used Elixir's Observer to hunt down bottlenecks
Very cool.
I'm using Elixir to listen to change events via https://github.com/cpursley/walex (which I basically ripped off from Supabase).
What are some alternatives?
fugue-bench - Fugue list CRDT implementations and benchmarks
PolarDB-for-PostgreSQL - A cloud-native database based on PostgreSQL developed by Alibaba Cloud.
electric - Local-first sync layer for web and mobile apps. Build reactive, realtime, local-first apps directly on Postgres.
neon - Neon: Serverless Postgres. We separated storage and compute to offer autoscaling, branching, and bottomless storage.
vaxine - Rich-CRDT database based on AntidoteDB.
realtime - Broadcast, Presence, and Postgres Changes via WebSockets
eventually-consistent-mesh - an attempt to create an asynchronously replicated append only eventually consistent data protocol
libcluster - Automatic cluster formation/healing for Elixir applications
crdt-benchmarks - Real world text editing traces for benchmarking CRDT and Rope data structures [Moved to: https://github.com/josephg/editing-traces]
worker - High performance Node.js/PostgreSQL job queue (also suitable for getting jobs generated by PostgreSQL triggers/functions out into a different work queue)
pg_crdt - POC CRDT support in Postgres
helm-charts - neondatabase helm charts