Backport PR #2517 to release/v1.7 for Bugfix that caused an error when argument has 3 or more nil arguments

[vdaas-ci]

Description

I fixed a problem that the result of Join does not return nil when three or more nil arguments are given.

Related Issue

Versions

• Go Version: 1.22.3
• Rust Version: 1.77.2
• Docker Version: 20.10.8
• Kubernetes Version: v1.30.0
• NGT Version: 2.2.1

Checklist

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer

Summary by CodeRabbit

• Bug Fixes

  • Improved error handling robustness for error aggregation, ensuring proper handling of nil pointers and empty error slices.

• Tests

  • Added comprehensive tests for the enhanced error aggregation functionality, covering various scenarios including nil and non-nil errors.

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[coderabbitai]

Walkthrough

Walkthrough

The updates enhance the error handling in Join function to manage joinError types and Unwrap() []error methods more effectively by including checks for nil pointers and empty slices. Correspondingly, the TestJoin function was introduced to verify these improvements through various test scenarios involving different combinations of nil and non-nil errors.

Changes

Files	Change Summary
internal/errors/errors.go	Modified Join function to improve robustness in handling specific error types.
internal/errors/errors_test.go	Added TestJoin function with comprehensive test cases for Join function including new types and checks.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant JoinFunction as Join Function
    participant Error1 as Error1
    participant Error2 as Error2
    Caller->>JoinFunction: Call with Error1, Error2
    JoinFunction->>JoinFunction: Check for nil and empty slice
    alt Error1 and Error2 are non-nil
        JoinFunction->>Error1: Check Unwrap method
        JoinFunction->>Error2: Check Unwrap method
        JoinFunction->>JoinFunction: Aggregate errors
    else One or both are nil
        JoinFunction->>JoinFunction: Handle nil appropriately
    end
    JoinFunction->>Caller: Return aggregated error

Loading

The sequence diagram illustrates the control flow within the Join function after the modifications. It shows how the function checks for nil and non-nil errors, evaluates the presence of the Unwrap method, and subsequently aggregates the errors accordingly.

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[coderabbitai]

Actionable comments posted: 0

Outside diff range and nitpick comments (1)

internal/errors/errors.go (1)

Line range hint 266-288: Refactor suggestion for the Join function.

The Join function has been modified to handle multiple errors more effectively. However, the current implementation seems a bit complex and repetitive, especially in handling different types of errors (*joinError and interface{ Unwrap() []error }). Consider simplifying this by consolidating common logic.

func Join(errs ...error) error {
    if len(errs) == 0 {
        return nil
    }
    var jointErrors []error
    for _, err := range errs {
        switch e := err.(type) {
        case *joinError:
            jointErrors = append(jointErrors, e.errs...)
        case interface{ Unwrap() []error }:
            jointErrors = append(jointErrors, e.Unwrap()...)
        default:
            if err != nil {
                jointErrors = append(jointErrors, err)
            }
        }
    }
    if len(jointErrors) == 0 {
        return nil
    }
    return &joinError{errs: jointErrors}
}

This refactored version removes the need to check nil and length conditions multiple times, simplifying the flow and reducing redundancy.

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 38018db and 268845f.

Files selected for processing (2)

• internal/errors/errors.go (2 hunks)
• internal/errors/errors_test.go (3 hunks)

Additional comments not posted (1)

internal/errors/errors_test.go (1)

1654-1733: Comprehensive and well-structured test scenarios in TestJoin

The TestJoin function introduces several test cases to ensure that the Join function behaves as expected under different conditions:

• When all input errors are nil, it correctly returns nil.
• When all input errors are non-nil and distinct, it returns an aggregated error.
• When the errors are a mix of nil and non-nil, it correctly returns the non-nil error.

These test cases are crucial for verifying the bug fix and ensuring that the Join function can handle multiple nil inputs, which was the primary issue addressed by the PR. The use of goleak.VerifyNone to check for goroutine leaks is a good practice in concurrent environments, enhancing the robustness of the tests.

The function uses a standard structure for table-driven tests in Go, which enhances readability and maintainability. Each test case is clearly defined, making it easy to understand the expected behavior and the actual outcome.

Overall, the implementation aligns well with the PR's objectives, and the tests appear to cover the necessary scenarios to ensure the functionality of the Join function post-fix.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/v1.7@38018db). Learn more about missing BASE report.

Files	Patch %	Lines
internal/errors/errors.go	42.85%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release/v1.7    #2520   +/-   ##
===============================================
  Coverage                ?   18.96%           
===============================================
  Files                   ?      565           
  Lines                   ?    65225           
  Branches                ?        0           
===============================================
  Hits                    ?    12372           
  Misses                  ?    52055           
  Partials                ?      798           

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[hlts2]

LGTM!