logical decoding / streaming replication

[kosta]

Do you consider Logical Decoding / Streaming Replication a goal of this library? I'm not 100% sure yet, but I might try a stab of implementing something similar as wal2json in rust. Would you be interested in a PR to add the necessary interface definitions etc. and maybe an example?

[bluejekyll]

Yes, that would be very cool.

I don’t have any strict plans for this library other than making it easy to build Postgres extensions in Rust.

There’s still a lot of conversion routines etc to build, so you may have a lot of work to achieve this.

[kosta]

I found this today, haven't looked into it besides reading the readme, but it seems like this might be exactly that use case? https://github.com/instructure/jsoncdc

[bluejekyll]

looks that way. It looks like they're building directly on top of the FFI, rather than trying to use generic wrappers like pg-extend-rs is exporting. I didn't find rgffi when I started this project, so that's interesting, I'm not sure how that deals with targeting multiple pg versions.

[felippemr]

Hey @bluejekyll, would you be able to provide some guidance on how would I start implementing(https://www.postgresql.org/docs/11/logicaldecoding-output-plugin.html) using this lib?

[bluejekyll]

It looks like we need a way to define _PG_output_plugin_init similar to how we do pg_magic macro.

In addition to that, it looks like a lot of C ffi functions would be declared for the callbacks.