fix:104 unsafe integer conversion in instance_utils.go

[gzb2025]

Ⅰ. Motivation

The GetPodComponentID function in instance_utils.go had two main issues:
Unsafe integer conversion: Used strconv.Atoi (which returns int, size-dependent on system) and directly cast to int32, risking overflow on 64-bit systems.
Incorrect negative ID parsing from pod name: When parsing component ID from pod names (e.g., instance-db--987), the original logic failed to recognize negative signs, resulting in incorrect positive values.
These issues could lead to unexpected behavior in component ID resolution, affecting instance management and scaling logic.

Ⅱ. Modifications

Improved integer parsing for labels:
Replaced strconv.Atoi with strconv.ParseInt(componentId, 10, 32) to explicitly parse values into int32 range, with error handling to return 0 on failure.
Fixed negative ID parsing from pod names:
When labels are missing, instead of directly taking the last segment of strings.Split(pod.Name, "-"), added logic to:
Traverse backward to find the last non-empty segment (handling empty strings from -- splits).
Check if the previous segment is empty to detect negative signs (e.g., --987 becomes -987).
Used strconv.ParseInt with 32 bit size for consistent range checks, returning 0 on parsing errors.
Added comprehensive test cases (in instance_utils_test.go) to cover edge cases.

Ⅲ. Does this pull request fix one issue?

fixes #104

Ⅳ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

Added TestGetPodComponentID with 12 test scenarios:
Valid positive/negative IDs from labels.
Invalid label values (non-numeric, exceeding int32 max/min).
Valid positive/negative IDs from pod names (e.g., instance-db--987).
Invalid pod name values (non-numeric, exceeding int32 max/min).
Boundary values (int32 max: 2147483647, int32 min: -2147483648) in labels and pod names.
These tests verify correct parsing, error handling, and range checks.

Ⅴ. Describe how to verify it

Unit tests: Run go test ./pkg/reconciler/instance/utils/ -v -run TestGetPodComponentID to ensure all test cases pass.
Manual verification:
Create pods with labels containing valid/invalid component IDs (e.g., component-id: "-123", component-id: "2147483648").
Create pods with names containing negative IDs (e.g., instance-web--456) and non-numeric suffixes (e.g., instance-db-abc).
Call GetPodComponentID on these pods and verify returns match expectations (correct IDs for valid cases, 0 for invalid cases).

VI. Special notes for reviews

Checklist

• [✅] Format your code make fmt.
• [✅] Add unit tests or integration tests.
• Update the documentation related to the change.

[gemini-code-assist]

Summary of Changes

Hello @gzb2025, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses critical issues within the GetPodComponentID function, ensuring robust and accurate component ID resolution for instance management. By implementing safer integer parsing and correcting the interpretation of negative IDs from pod names, the changes prevent potential data overflows and misinterpretations, thereby enhancing the stability and reliability of the system's instance identification logic.

Highlights

• Safe Integer Conversion: Replaced strconv.Atoi with strconv.ParseInt(componentId, 10, 32) in GetPodComponentID to explicitly parse values into int32 range, preventing potential overflows on 64-bit systems and adding error handling.
• Correct Negative ID Parsing: Improved logic for parsing component IDs from pod names to correctly handle negative signs, especially in cases like instance-db--987, where a double hyphen indicates a negative number.
• Comprehensive Test Coverage: Added extensive unit tests in instance_utils_test.go covering various scenarios, including valid/invalid IDs from labels and pod names, boundary values (MaxInt32, MinInt32), and out-of-range values.

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[gemini-code-assist]

Code Review

This pull request effectively addresses an unsafe integer conversion vulnerability in GetPodComponentID by replacing strconv.Atoi with strconv.ParseInt and specifying a 32-bit size, which prevents potential overflows. The changes also correctly handle parsing of negative component IDs from pod names, a case that was previously failing. The addition of a comprehensive test suite in instance_utils_test.go is excellent and covers many edge cases. I have one suggestion to further improve the test coverage by adding a boundary case.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Copilot]

Pull Request Overview

This pull request fixes unsafe integer conversion issues in the GetPodComponentID function, addressing issue #104. The changes ensure proper int32 range validation and correct parsing of negative component IDs from pod names.

Key Changes

• Replaced strconv.Atoi with strconv.ParseInt(componentId, 10, 32) to explicitly validate int32 range with proper error handling
• Implemented logic to correctly parse negative IDs from pod names (e.g., instance-db--987 → -987) by detecting double-dash patterns
• Added comprehensive test coverage with 12 test scenarios covering positive/negative values, boundary cases, and invalid inputs

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 13 comments.

File	Description
pkg/reconciler/instance/utils/instance_utils.go	Enhanced GetPodComponentID function with safer integer parsing using ParseInt with 32-bit constraint and improved negative number detection logic for pod name parsing
pkg/reconciler/instance/utils/instance_utils_test.go	Added comprehensive test suite with 12 test cases covering valid/invalid IDs, boundary values (int32 max/min), and edge cases for both label-based and name-based ID extraction

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[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

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[cheyang]

/gemini review

[gemini-code-assist]

Code Review

This pull request effectively addresses an unsafe integer conversion and a bug in parsing negative IDs from pod names in instance_utils.go. The use of strconv.ParseInt with a specific bit size is a solid improvement for type safety. The logic to handle negative IDs from pod names is also well-implemented. Furthermore, the addition of a comprehensive test suite in instance_utils_test.go is excellent for ensuring the correctness and robustness of these changes. I have provided a couple of suggestions: one to refactor the main function for better code clarity and maintainability by removing duplicated logic, and another to add a missing boundary condition to the test suite to make it even more complete.