Frontend Asset Optimization - #3
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WalkthroughThe web assets caching mechanism in Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (1 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
pkg/api/webassets/webassets.go(2 hunks)
🔇 Additional comments (3)
pkg/api/webassets/webassets.go (3)
11-11: LGTM!The
syncpackage import is necessary for theRWMutexused to guard the cache.
35-38: LGTM!The mutex and cache variable are properly declared and unexported. The TODO comment appropriately flags the global state as technical debt to address later.
69-70: Verify error handling behavior.The cache is updated even when
err != nil, potentially setting it tonilor a partial result. While the early-return check on line 45 guards against returning anilcache, verify that this error handling aligns with expectations and that downstream callers handle errors appropriately.Note: This behavior appears to predate the mutex addition, but it's worth confirming during concurrent scenarios.
| entryPointAssetsCacheMu.RLock() | ||
| ret := entryPointAssetsCache | ||
| entryPointAssetsCacheMu.RUnlock() | ||
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| if cfg.Env != setting.Dev && ret != nil { | ||
| return ret, nil | ||
| } | ||
| entryPointAssetsCacheMu.Lock() | ||
| defer entryPointAssetsCacheMu.Unlock() |
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Incomplete double-checked locking pattern.
After releasing the read lock (line 43) and before acquiring the write lock (line 48), another goroutine may have already updated the cache. Without a second check after acquiring the write lock, multiple concurrent callers could redundantly perform the expensive asset-reading operation.
Apply this diff to complete the double-checked locking pattern:
entryPointAssetsCacheMu.Lock()
defer entryPointAssetsCacheMu.Unlock()
+
+ // Double-check: another goroutine may have updated the cache
+ if cfg.Env != setting.Dev && entryPointAssetsCache != nil {
+ return entryPointAssetsCache, nil
+ }
var err error🤖 Prompt for AI Agents
In pkg/api/webassets/webassets.go around lines 41 to 49, the double-checked
locking is incomplete: after releasing the read lock and before acquiring the
write lock another goroutine may have populated entryPointAssetsCache. Update
the code to re-check entryPointAssetsCache after acquiring the write lock and if
it's now non-nil (and cfg.Env != setting.Dev) return it immediately; only
proceed with the expensive asset-reading and assignment when the cache is still
nil (or env requires reload). Ensure the write-lock is held while assigning
entryPointAssetsCache and that defer entryPointAssetsCacheMu.Unlock() remains in
place.
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This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 2 weeks if no further activity occurs. Please feel free to give a status update or ping for review. Thank you for your contributions! |
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This pull request has been automatically closed because it has not had any further activity in the last 2 weeks. Thank you for your contributions! |
2 participants
Test 8
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Replicated from ai-code-review-evaluation/grafana-coderabbit#8