Use Unconstructible trait for internal types by ever0de · Pull Request #6052 · RustPython/RustPython · GitHub

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Summary by CodeRabbit

Bug Fixes
- Prevented direct creation of Blob and Statement objects in the sqlite3 module from Python, ensuring a clear error is raised if attempted.
- Improved error messages by adding quotes around class names when instantiation is disallowed.

Walkthrough

The changes update the Blob and Statement classes in the sqlite3 module to explicitly specify their module and class names and mark them as unconstructible from Python by implementing the Unconstructible trait. Additionally, the error message for unconstructible class instantiation is refined by adding quotes around the class name in the error text.

Changes

Cohort / File(s)	Change Summary
sqlite3 Blob & Statement class unconstructibility stdlib/src/sqlite.rs	Added Unconstructible trait implementation for Blob and Statement classes; updated #[pyclass] attributes to specify module = "sqlite3" and include Unconstructible, preventing direct instantiation from Python.
Unconstructible error message formatting vm/src/types/slot.rs	Modified error message in slot_new function to add single quotes around the class slot name in the unconstructible instantiation error message.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~7 minutes

Suggested reviewers

youknowone

Poem

In sqlite’s burrow, classes hide,
Blob and Statement, side by side.
“You can’t make us!” they now shout,
Unconstructible blocks your route.
A rabbit hops by, gives a wink—
“Direct creation? Not what you think!”
🐇✨

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📒 Files selected for processing (2)

stdlib/src/sqlite.rs (5 hunks)
vm/src/types/slot.rs (1 hunks)

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vm/src/types/slot.rs

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stdlib/src/sqlite.rs

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Could you check if Unconstructible works?

Suggested change

      
                impl Constructor for Blob {
          
                impl Unconstructible for Blob {

We can proceed with this fix by adding single quotes to the error message. I will apply the patch for now.

https://github.com/ever0de/RustPython/blob/b2d6594bd9cc7a91b85cfe107d0e4ce7916bae62/vm/src/types/slot.rs#L801-L808

- Err(vm.new_type_error(format!("cannot create {} instances", cls.slot_name())))
+ Err(vm.new_type_error(format!("cannot create '{}' instances", cls.slot_name())))

👍

Prevent direct instantiation of sqlite3.{Statement,Blob}

b2d6594

ever0de marked this pull request as draft August 1, 2025 04:44

ever0de marked this pull request as ready for review August 1, 2025 05:08

youknowone reviewed Aug 1, 2025

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Use Unconstructible trait for internal types

ec0a232

youknowone approved these changes Aug 1, 2025

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youknowone merged commit 92fdfc4 into RustPython:main Aug 1, 2025
12 checks passed

ever0de changed the title Prevent direct instantiation of sqlite3.{Statement,Blob} Use Unconstructible trait for internal types Aug 3, 2025

coderabbitai Bot mentioned this pull request Dec 16, 2025

flag: DISALLOW_INSTANTIATION #6445

Merged

Use Unconstructible trait for internal types by ever0de · Pull Request #6052 · RustPython/RustPython · GitHub

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Use Unconstructible trait for internal types - #6052

Use Unconstructible trait for internal types#6052
youknowone merged 2 commits into
RustPython:mainfrom
ever0de:fix/sqlite-prevent-direct-instantiation

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Use Unconstructible trait for internal types by ever0de · Pull Request #6052 · RustPython/RustPython · GitHub

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Use Unconstructible trait for internal types - #6052

Use Unconstructible trait for internal types#6052youknowone merged 2 commits intoRustPython:mainRustPython/RustPython:mainfrom ever0de:fix/sqlite-prevent-direct-instantiationever0de/RustPython:fix/sqlite-prevent-direct-instantiationCopy head branch name to clipboard

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Summary by CodeRabbit

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Use Unconstructible trait for internal types#6052
youknowone merged 2 commits into
RustPython:mainfrom
ever0de:fix/sqlite-prevent-direct-instantiation

ever0de commented Aug 1, 2025 •
edited by coderabbitai Bot
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