Race Condition in Access Code Generation for Quiz
Maintainers usually reply within 1 day
@chetna123-ch is already working on this.
Since Oct 19, 2026.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 48/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Quiet
- Tech stack
- express, postgresql, typescript
Research direction
Start at the endpoint named in the issue, /apps/http-server/routes/api/v1/quizzes/:quizId/generate-access-code, and trace how it generates and stores access codes. Check the database schema and existing tests for uniqueness constraints or collision handling. Done means concurrent requests cannot assign duplicate codes and collisions are handled safely; the payload does not name a test file.
Written by the indexing model from the issue text.
Description
📍 Location
/apps/http-server/routes/api/v1/quizzes/:quizId/generate-access-code
Problem Description
The current implementation of the access code generation endpoint is vulnerable to a race condition when multiple users request a code simultaneously.
Scenario:
User A and User B send a request at the same time
Both requests execute generateCode()
Both receive the same generated code (e.g., AC123A)
The system assigns duplicate access codes
This leads to non-unique access codes, which breaks the assumption that each quiz session should have a unique join code.
Expected Behavior
- Each generated access code must be globally unique
- Concurrent requests should never result in duplicate codes
- The system should handle collisions gracefully (e.g., retry mechanism)
- Dominant language
- TypeScript
- Stars
- 21
- Forks
- 7
- Avg merge
- 3h 39m
- Merged PRs (30d)
- 16
Getting set up
- Ships a Dockerfile or Docker Compose file
- Has a pull request template
- Read the contributing guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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