Automated Test: asset-loading-optimized

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This pull request was automatically created by @coderabbitai/e2e-reviewer.

Batch created pull request.

Summary by CodeRabbit

• Chores
  • Improved web assets caching efficiency and reliability through enhanced internal concurrency handling.

[coderabbit-eval]

📝 Walkthrough

Walkthrough

The change introduces thread-safe caching for web assets in the webassets package by adding a RWMutex and cache variable. Read locks retrieve cached assets in non-development environments, while write locks guard cache population and updates. Asset loading behavior remains unchanged.

Changes

Cohort / File(s)	Summary
Web Assets Cache Synchronization pkg/api/webassets/webassets.go	Added RWMutex (entryPointAssetsCacheMu) and cache variable (entryPointAssetsCache) to protect concurrent access. Replaced nil-check with read-lock for cache retrieval and added write-lock for cache updates.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Poem

🐰 With locks so fine, no race we'll find,
Our assets cached, thread-safe in mind,
RWMutex guards the sacred store,
Concurrency blessed forevermore! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'Automated Test: asset-loading-optimized' is vague and generic, using non-descriptive terms that don't convey the actual technical change (adding concurrency-safe caching with RWMutex to web assets).	Revise the title to clearly describe the main change, such as 'Add thread-safe caching to web asset loading' or 'Implement RWMutex for concurrent web asset cache access'.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ 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 asset-loading-optimized

---

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[coderabbit-eval]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@pkg/api/webassets/webassets.go`:
- Around line 40-50: GetWebAssets has a TOCTOU: after releasing the read lock
and before loading assets you must re-check the cache under the write lock to
avoid redundant loads; after entryPointAssetsCacheMu.Lock() (inside
GetWebAssets) add a second check of entryPointAssetsCache (and return it if
non-nil) before performing the expensive asset loading logic, keeping the
existing cfg.Env / setting.Dev behavior and using the same entryPointAssetsCache
and entryPointAssetsCacheMu symbols.

[coderabbit-eval]

⚠️ Potential issue | 🟠 Major

Missing double-check after acquiring write lock causes redundant asset loading.

The current implementation has a TOCTOU (time-of-check to time-of-use) issue. Between releasing the read lock (line 43) and acquiring the write lock (line 48), another goroutine may have already populated the cache. Without a re-check, multiple concurrent requests at startup will all perform redundant file/CDN reads.

🔧 Proposed fix: Add double-check after acquiring write lock

 func GetWebAssets(ctx context.Context, cfg *setting.Cfg, license licensing.Licensing) (*dtos.EntryPointAssets, error) {
 	entryPointAssetsCacheMu.RLock()
 	ret := entryPointAssetsCache
 	entryPointAssetsCacheMu.RUnlock()

 	if cfg.Env != setting.Dev && ret != nil {
 		return ret, nil
 	}
 	entryPointAssetsCacheMu.Lock()
 	defer entryPointAssetsCacheMu.Unlock()

+	// Double-check after acquiring write lock
+	if cfg.Env != setting.Dev && entryPointAssetsCache != nil {
+		return entryPointAssetsCache, nil
+	}
+
 	var err error
 	var result *dtos.EntryPointAssets

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	func GetWebAssets(ctx context.Context, cfg *setting.Cfg, license licensing.Licensing) (*dtos.EntryPointAssets, error) {
	if cfg.Env != setting.Dev && entryPointAssetsCache != nil {
	return entryPointAssetsCache, nil
	entryPointAssetsCacheMu.RLock()
	ret := entryPointAssetsCache
	entryPointAssetsCacheMu.RUnlock()
	if cfg.Env != setting.Dev && ret != nil {
	return ret, nil
	}
	entryPointAssetsCacheMu.Lock()
	defer entryPointAssetsCacheMu.Unlock()
	func GetWebAssets(ctx context.Context, cfg *setting.Cfg, license licensing.Licensing) (*dtos.EntryPointAssets, error) {
	entryPointAssetsCacheMu.RLock()
	ret := entryPointAssetsCache
	entryPointAssetsCacheMu.RUnlock()
	if cfg.Env != setting.Dev && ret != nil {
	return ret, nil
	}
	entryPointAssetsCacheMu.Lock()
	defer entryPointAssetsCacheMu.Unlock()
	// Double-check after acquiring write lock
	if cfg.Env != setting.Dev && entryPointAssetsCache != nil {
	return entryPointAssetsCache, nil
	}

🤖 Prompt for AI Agents

In `@pkg/api/webassets/webassets.go` around lines 40 - 50, GetWebAssets has a
TOCTOU: after releasing the read lock and before loading assets you must
re-check the cache under the write lock to avoid redundant loads; after
entryPointAssetsCacheMu.Lock() (inside GetWebAssets) add a second check of
entryPointAssetsCache (and return it if non-nil) before performing the expensive
asset loading logic, keeping the existing cfg.Env / setting.Dev behavior and
using the same entryPointAssetsCache and entryPointAssetsCacheMu symbols.