⚡ Bolt: Optimize toggleLike with atomic updates#78
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Refactored `toggleLike` in `server/storage.ts` to use database transactions and atomic SQL updates. This eliminates a race condition in `likeCount` updates and reduces database round trips by removing a redundant `getSong` query. Co-authored-by: Krosebrook <214532761+Krosebrook@users.noreply.github.com>
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Summary of ChangesHello @Krosebrook, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the reliability and performance of the song liking mechanism. By transitioning to atomic database transactions and direct SQL updates, it resolves potential race conditions that could lead to inaccurate like counts and streamlines database interactions, resulting in a more robust and efficient system. Highlights
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Code Review
The pull request effectively refactors the toggleLike function to use atomic SQL updates within a database transaction, which is a significant improvement for data consistency and performance. The change correctly addresses potential race conditions and reduces redundant database queries. The use of COALESCE and GREATEST in the SQL updates is a good practice for handling potential null values and ensuring the like count doesn't go below zero. Overall, this is a well-executed optimization.
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Pull request overview
This PR optimizes the toggleLike function by replacing the read-modify-write pattern with atomic SQL updates wrapped in a database transaction. The optimization eliminates a redundant getSong query and prevents race conditions in likeCount updates by using SQL-level atomic increment/decrement operations.
Changes:
- Wrapped the entire toggleLike operation in a
db.transaction()for atomicity - Replaced read-then-calculate-then-update pattern with atomic SQL updates using
COALESCEandGREATEST - Removed redundant
getSongcall (song existence now validated only at route handler level)
| return { liked: false, likeCount: updatedSong?.likeCount ?? 0 }; | ||
| } else { | ||
| // Like | ||
| await tx.insert(songLikes).values({ userId, songId }); |
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When a song doesn't exist, the insert will fail with a foreign key constraint violation, causing the transaction to roll back and throw an unhandled database error. Consider checking if updatedSong exists after the update (line 130-133) and throwing a user-friendly error if the song wasn't found, to provide consistent error handling similar to the route handler's 404 response.
| const [updatedSong] = await tx.update(songs) | ||
| .set({ likeCount: sql`GREATEST(COALESCE(${songs.likeCount}, 0) - 1, 0)` }) | ||
| .where(eq(songs.id, songId)) | ||
| .returning({ likeCount: songs.likeCount }); | ||
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| return { liked: false, likeCount: updatedSong?.likeCount ?? 0 }; |
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When a song doesn't exist, the update will succeed but return undefined for updatedSong, resulting in likeCount: 0 being returned. This silently succeeds rather than indicating an error. Consider checking if updatedSong exists and throwing an error if not, to maintain consistency with the "like" path behavior and provide clearer error handling.
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| return { liked: false, likeCount: updatedSong?.likeCount ?? 0 }; | ||
| } else { | ||
| // Like | ||
| await tx.insert(songLikes).values({ userId, songId }); |
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toggleLike now inserts into song_likes without re-checking that the song still exists, so a concurrent delete between the route-level existence check and this storage call can raise a foreign-key error and turn a normal like request into a 500. The POST /api/songs/:id/like handler in server/routes.ts does a pre-check, but that check is in a separate query and can race with DELETE /api/songs/:id; before this commit, toggleLike called getSong internally and returned a safe response instead of throwing.
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1 participant
💡 What: Refactored
toggleLiketo use database transactions and atomic SQL updates.🎯 Why: Fixes race conditions in
likeCountupdates and reduces database round trips by removing redundantgetSongquery.📊 Impact: Reduces queries per like action from 4 to 3 (when including route check) or 3 to 2 (internal storage), and guarantees data consistency.
🔬 Measurement: Verified with
pnpm checkandpnpm build.PR created automatically by Jules for task 14520545171352132256 started by @Krosebrook
Summary by cubic
Refactored toggleLike to run in a single transaction with atomic likeCount updates. This fixes race conditions and removes a redundant read, reducing one query per like/unlike.
Bug Fixes
Refactors
Written for commit e2b766f. Summary will update on new commits.