Refactor: Optimize validation order in validateRoleStructure()

[mlajkim]

Background

While diving into the source code, I noticed a small optimization opportunity in validateRoleStructure().

What's done

• Deferred DB I/O: Moved getAthenzDomain() (that takes DB lookup) to the end of the block. We should fail fast on structural errors (like self-delegation) before making any external calls
• Cleanup: Removed the unnecessary variable definition athenzDomain since it was being used only once

It's a minor change since these validation errors are extremely rare to happen, but it keeps the logic cleaner and more optimal just in case.

Contribution Checklist:

• The pull request does not introduce any breaking changes
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[gemini-code-assist]

Summary of Changes

Hello @mlajkim, 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 introduces a minor but impactful refactoring to the validateRoleStructure method. The primary goal is to enhance efficiency and maintainability by optimizing the order of validation checks, specifically by deferring a database-intensive operation until after quicker, structural validations have passed. Additionally, it cleans up the code by removing an unnecessary variable declaration.

Highlights

• Optimization of validation order: The getAthenzDomain() call, which involves a database lookup, has been moved to occur later in the validateRoleStructure method. This ensures that structural errors, such as self-delegation, are caught and handled before incurring the cost of an external database call, promoting a 'fail-fast' approach.
• Code Cleanup: The athenzDomain variable, which was only used once, has been removed to simplify the code and eliminate an unnecessary variable definition.

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[gemini-code-assist]

Code Review

This pull request correctly refactors the validateRoleStructure method to optimize the order of validations. By deferring the database call (getAthenzDomain) until after the cheaper, in-memory structural checks, the change implements a fail-fast approach that improves efficiency. The removal of the unnecessary athenzDomain local variable is also a good cleanup. The changes are sound and improve the codebase. Well done.