fix(PyKeyValuePairLogEvent): Ensure proper Py_None reference count management when inserting into Python dictionaries (fixes #128).

[LinZhihao-723]

Description

This PR fixes the bug explained in #128.
In terms of maintainability, we move get_new_ref_to_py_none to utils.hpp.

Validation performed

• Ensure the bug has been fixed after applying this PR.
• Ensure all workflows passed.

Summary by CodeRabbit

Release Notes

• Refactor

  • Improved Python None object reference management
  • Added utility function to handle None object references more efficiently
  • Streamlined code by removing redundant reference management function

• Chores

  • Updated internal utility methods for Python object handling

The changes focus on optimizing memory management and reference counting for Python objects, with minimal impact on end-user functionality.

[coderabbitai]

Walkthrough

This pull request addresses reference counting and memory management for Python None objects across multiple files in the clp-ffi-py project. The changes involve introducing a new utility function get_new_ref_to_py_none() in utils.cpp and utils.hpp, modifying how Py_None is handled in PyKeyValuePairLogEvent.cpp, and removing a redundant function in deserialization_methods.cpp. The modifications aim to improve the proper management of reference counts for Python None objects.

Changes

File	Change Summary
src/clp_ffi_py/utils.hpp	Added [[nodiscard]] auto get_new_ref_to_py_none() -> PyObject* function declaration
src/clp_ffi_py/utils.cpp	Implemented get_new_ref_to_py_none() function to return a new reference to Py_None
src/clp_ffi_py/ir/native/PyKeyValuePairLogEvent.cpp	Modified insert_kv_pair_into_py_dict to use get_new_ref_to_py_none()
src/clp_ffi_py/ir/native/deserialization_methods.cpp	Removed get_new_ref_to_py_none() function

Possibly related issues

• Py_None's reference count is managed improperly in PyKeyValuePairLogEvent::to_dict. #128: Directly addresses the improper reference count management of Py_None in PyKeyValuePairLogEvent::to_dict, which is the core problem this PR aims to solve.

Possibly related PRs

• refactor: Fix clang-tidy warnings in PySerializer. #110: Directly related to the removal of get_new_ref_to_py_none() function
• refactor: Fix clang-tidy warnings in PyDeserializer. #111: Indirectly related through Python object reference management

Suggested reviewers

• haiqi96

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Reviewing files that changed from the base of the PR and between 2595c70 and 8d83b4f.

📒 Files selected for processing (4)

• src/clp_ffi_py/ir/native/PyKeyValuePairLogEvent.cpp (1 hunks)
• src/clp_ffi_py/ir/native/deserialization_methods.cpp (0 hunks)
• src/clp_ffi_py/utils.cpp (1 hunks)
• src/clp_ffi_py/utils.hpp (1 hunks)

💤 Files with no reviewable changes (1)

• src/clp_ffi_py/ir/native/deserialization_methods.cpp

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src/clp_ffi_py/utils.hpp (1)

Pattern **/*.{cpp,hpp,java,js,jsx,ts,tsx}: - Prefer false == <expression> rather than !<expression>.

src/clp_ffi_py/ir/native/PyKeyValuePairLogEvent.cpp (1)

Pattern **/*.{cpp,hpp,java,js,jsx,ts,tsx}: - Prefer false == <expression> rather than !<expression>.

src/clp_ffi_py/utils.cpp (1)

Pattern **/*.{cpp,hpp,java,js,jsx,ts,tsx}: - Prefer false == <expression> rather than !<expression>.

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🔇 Additional comments (3)

src/clp_ffi_py/utils.cpp (1)

103-106: LGTM! The implementation correctly handles reference counting.

The function properly increments the reference count of Py_None before returning it, which is essential for Python's memory management.

src/clp_ffi_py/utils.hpp (1)

107-110: LGTM! The declaration is well-documented and properly annotated.

The [[nodiscard]] attribute ensures that callers don't accidentally ignore the returned reference, which would lead to memory leaks.

src/clp_ffi_py/ir/native/PyKeyValuePairLogEvent.cpp (1)

624-624: LGTM! The change fixes the reference counting issue.

Using get_new_ref_to_py_none() ensures that Py_None's reference count is properly incremented when inserting it into the Python dictionary.

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[junhaoliao]

For the PR title, how about:

fix(PyKeyValuePairLogEvent): Ensure proper `Py_None` reference count management when inserting into Python dictionaries.

[LinZhihao-723]

For the PR title, how about:

fix(PyKeyValuePairLogEvent): Ensure proper `Py_None` reference count management when inserting into Python dictionaries.

I kept (fixes #128) section in the title.