[redis] map redis.Nil to ErrKeyNotFound

[capcom6]

Summary by CodeRabbit

• Bug Fixes
  • Improved cache lookups so missing Redis entries are now reported as a normal cache miss instead of an unexpected error.
  • Reduced noise in cache-related failures, making it easier for applications to handle missing data gracefully.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a49923d2-1fcc-4984-b781-f7c4127ffe9e

📥 Commits

Reviewing files that changed from the base of the PR and between 76bf782 and f35728a.

📒 Files selected for processing (1)

• cache/redis.go

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Walkthrough

RedisCache.Get now detects redis.Nil errors returned from the Lua Eval call and returns ErrKeyNotFound instead of the generic "failed to get cache item" error, providing explicit cache-miss handling for the atomic script path.

Changes

Redis Get cache-miss fix

Layer / File(s)	Summary
Handle redis.Nil as cache miss cache/redis.go	Added a check for errors.Is(err, redis.Nil) after the Lua Eval call in RedisCache.Get, returning ErrKeyNotFound instead of the generic error.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the Redis cache change to map redis.Nil to ErrKeyNotFound.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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