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## Problem We want to serialize interpreted records to send them over the wire from safekeeper to pageserver. ## Summary of changes Make `InterpretedWalRecord` ser/de. This is a temporary change to get the bulk of the lift merged in https://github.com/neondatabase/neon/pull/9746. For going to prod, we don't want to use bincode since we can't evolve the schema. Questions on serialization will be tackled separately.
This module contains utilities for working with PostgreSQL file formats. It's a collection of structs that are auto-generated from the PostgreSQL header files using bindgen, and Rust functions to read and manipulate them.
There are also a bunch of constants in pg_constants.rs that are copied
from various PostgreSQL headers, rather than auto-generated. They mostly
should be auto-generated too, but that's a TODO.
The PostgreSQL on-disk file format is not portable across different
CPU architectures and operating systems. It is also subject to change
in each major PostgreSQL version. Currently, this module supports
PostgreSQL v14, v15 and v16: bindings and code that depends on them are
version-specific.
This code is organized in modules postgres_ffi::v14, postgres_ffi::v15 and
postgres_ffi::v16. Version independent code is explicitly exported into
shared postgres_ffi.
TODO: Currently, there is also some code that deals with WAL records in pageserver/src/waldecoder.rs. That should be moved into this module. The rest of the codebase should not have intimate knowledge of PostgreSQL file formats or WAL layout, that knowledge should be encapsulated in this module.