fix(store/v2): flaky TestDenomMetadata integration test.

[TropicalDog17]

Description

Might closes #22736

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Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for database iterator closing mechanism
  • Added safety check to prevent potential runtime errors when closing database iterators

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request introduces a modification to the Close method in the pebbleDBIterator struct within the store/v2/db/pebbledb.go file. The change adds a nil check to prevent potential runtime panics when attempting to close an iterator with a nil source. This enhancement improves error handling by ensuring that the method can safely handle cases where the iterator's source is not initialized.

Changes

File	Change Summary
store/v2/db/pebbledb.go	Added nil check in Close() method of pebbleDBIterator to prevent nil pointer dereference

Assessment against linked issues

Objective	Addressed	Explanation
Resolve flaky integration v2 test [#22736]	✅

Suggested Labels

C:x/bank, C:server/v2

Suggested Reviewers

• kocubinski
• testinginprod
• julienrbrt
• tac0turtle

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 07d5168 and 7ee2b28.

📒 Files selected for processing (1)

• store/v2/db/pebbledb.go (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

store/v2/db/pebbledb.go (1)

Pattern **/*.go: Review the Golang code for conformity with the Uber Golang style guide, highlighting any deviations.

🔇 Additional comments (1)

store/v2/db/pebbledb.go (1)

231-233: Prevents nil pointer dereference and allows safe repeated calls to Close().

This check ensures that calling Close() on an iterator with a nil source won't lead to a panic, making the method more robust in scenarios where it might be invoked multiple times or after the underlying resource is already released.

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[TropicalDog17]

/cc @julienrbrt

[julienrbrt]

Calling close multiple times shouldn't panic that makes sense. However, should it error? cc @kocubinski