refactor: remove use of cbor.DecodeGeneric

[agaffney]

Fixes #409

Summary by CodeRabbit

• Refactor
  • Optimized internal data decoding process with no changes to user-facing functionality.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change modifies the DNSReferenceRefScriptDatum.UnmarshalCBOR method in internal/indexer/datum.go to replace the cbor.DecodeGeneric function call with an explicit decode path. The new approach decodes the inner constructor into a temporary typed alias, then assigns the result back to the original type. The previously included explanatory comment about DecodeGeneric is removed, along with the generic decoding logic.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Single file and method affected, making this a localized change
• Straightforward refactoring from generic to explicit decoding approach
• Consistency of the typed alias pattern and correctness of the explicit decode path should be verified
• Ensure the new approach handles all edge cases previously covered by DecodeGeneric

Pre-merge checks and finishing touches

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'refactor: remove use of cbor.DecodeGeneric' clearly describes the main change in the PR: replacing cbor.DecodeGeneric with an explicit decode path.
Linked Issues check	✅ Passed	The PR successfully addresses the objective in issue #409 by replacing cbor.DecodeGeneric with a direct decoding method that avoids reflection in DNSReferenceRefScriptDatum.UnmarshalCBOR.
Out of Scope Changes check	✅ Passed	All changes are focused on the stated objective of removing cbor.DecodeGeneric usage from the DNSReferenceRefScriptDatum type; no out-of-scope modifications detected.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/remove-cbor-decode-generic

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d584c7b and 17b8885.

📒 Files selected for processing (1)

• internal/indexer/datum.go (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Analyze (go)

🔇 Additional comments (1)

internal/indexer/datum.go (1)

58-65: Based on the script output and web search results, I can now verify the review comment. Let me generate the final rewritten version:

Verify the type alias pattern correctly handles the embedded cbor.StructAsArray directive by running existing tests.

The type alias approach is a correct and well-established Go pattern for avoiding infinite recursion when implementing custom unmarshalers. When a CBOR value implements the Unmarshaler interface, Unmarshal calls that value's UnmarshalCBOR method. By creating a type alias without the custom method, the decoder uses the default struct decoding logic, which should properly handle the embedded directive and improve performance by avoiding reflection-based decoding.

However, since no dedicated test functions were found for DNSReferenceRefScriptDatum, please verify this change against any integration tests that decode actual on-chain CBOR data to ensure the three byte slice fields (TldName, SymbolDrat, SymbolHns) are populated correctly and that the results match the previous DecodeGeneric approach.

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