bbhoss
Cainophile - Change Data Capture for Postgres using Elixir
I recently announced my work on Cainophile, and it was suggested I post it here for further dissemination and feedback. Cainophile is a library to assist you in building change data capture systems with Postgres and Elixir. I also have released a separate library for decoding the logical Postgres replication log directly in case that is helpful. You can find full details on the announcement.
First Post!
slashdotdash
Looks really useful and is something I’ve been wanting to do with Postgres in Elixir for a while.
Does using :temporary as the replication slot mean that only new changes will be received by the subscriber and it won’t receive any historical changes when restarted? For a use case I have in mind this is the behaviour I want whereby the subscriber only receives the changes made while its running.
Last Post!
cpursley
This is something I’m wondering about as well. It would be nice to be able to decode directly to erlang/elixir types (especially integers, booleans).
I slapped together a library that borrows the Supbase realtime / Cainophile code. The main change I made was add a process to accept the changes so that you can act on the data right in Elixir (and send off wherever you like).
One of the todos is to address the type decoding if that’s even possible (and it would be nice to have an adapter approach so that you can specify the type you want). Another is to swap out epgsql now that Postgrex has native replication.
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