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2794cd83c7
Another preparatory commit for pg15 support: * generate bindings for both pg14 and pg15; * update Makefile and CI scripts: now neon build depends on both PostgreSQL versions; * some code refactoring to decrease version-specific dependencies.
23 lines
1.1 KiB
Markdown
23 lines
1.1 KiB
Markdown
This module contains utilities for working with PostgreSQL file
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formats. It's a collection of structs that are auto-generated from the
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PostgreSQL header files using bindgen, and Rust functions to read and
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manipulate them.
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There are also a bunch of constants in `pg_constants.rs` that are copied
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from various PostgreSQL headers, rather than auto-generated. They mostly
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should be auto-generated too, but that's a TODO.
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The PostgreSQL on-disk file format is not portable across different
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CPU architectures and operating systems. It is also subject to change
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in each major PostgreSQL version. Currently, this module supports
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PostgreSQL v14 and v15: bindings and code that depends on them are version-specific.
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This code is organized in modules: `postgres_ffi::v14` and `postgres_ffi::v15`
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Version independend code is explicitly exported into shared `postgres_ffi`.
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TODO: Currently, there is also some code that deals with WAL records
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in pageserver/src/waldecoder.rs. That should be moved into this
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module. The rest of the codebase should not have intimate knowledge of
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PostgreSQL file formats or WAL layout, that knowledge should be
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encapsulated in this module.
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