Cratewide API privatisation #318
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CI failed because of clippy. Once UDT is no longer part of public API, clippy starts complaining about its name violating the conventions. |
Lorak-mmk
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Jun 10, 2025
Two functions in `metadata.rs` were missing the `#[no_mangle]` attribute, which is necessary for FFI compatibility: - `cass_materialized_view_meta_partition_key_count` - `cass_materialized_view_meta_clustering_key` This commit adds the attribute to ensure that these functions can be correctly linked from C code.
This serves two purposes: 1. Explicit is better for readability. 2. It avoids a warning about `CASS_COMPRESSION_NONE` being unused once we privatise the module which imports it (in next commits).
UDTDataType had two methods that were not used anywhere in the codebase: - `add_field`; - `get_field_by_index`. These methods were removed not to clutter the codebase with unused code.
The field was not being used anywhere in the codebase, so it's removed.
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This is a big commit that privatises a lot of items which have been `pub` for no good reason. The goal is to make the public API of the wrapper clear and minimal, and to prevent silencing warnings about unused items (because `pub` items are always considered used). I've kept the `argconv` module public, together with its traits and types, because it's used in doctests. Privatising it would make them stop compiling. Also, those type and traits are actually part of the API, in a sense that they are FFI-facing. So let them stay public.
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So that checks pass without complaints.
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Motivation
Lots of items in the driver are exposed as
pubfor no good reason. This involves:pubstructs and enums,pubtraits,pubfields,pubfunctions and methods.This has a number of drawbacks:
cassandra.h.pubitems are considered used by the compiler.pubfunctions must be exposed as proper (noninlined) functions, and they must obey calling conventions.pubtypes and theirpubfields must not be individually optimised, so that other crates can understand how to use them.So privatisation is profitable!
What's done
Privatisation
I perused the whole crate and replaced
pubwithpub(crate)(or evenpub(self)) where possible.Found & removed a bug in materialized views API
Two functions in
metadata.rswere missing the#[no_mangle]attribute, which is necessary for FFI compatibility:cass_materialized_view_meta_partition_key_count;cass_materialized_view_meta_clustering_key.So I added the missing attribute. I have an idea how to prevent similar bugs - will open an issue.
Cleanup after privatisation
A number of items were found to be unused. I either removed them or silenced the warnings.
Pre-review checklist
[ ] I have enabled appropriate tests in.github/workflows/build.ymlingtest_filter.[ ] I have enabled appropriate tests in.github/workflows/cassandra.ymlingtest_filter.