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# Aniworld Web Application Development Instructions
This document provides detailed tasks for AI agents to implement a modern web application for the Aniworld anime download manager. All tasks should follow the coding guidelines specified in the project's copilot instructions.
## Project Overview
The goal is to create a FastAPI-based web application that provides a modern interface for the existing Aniworld anime download functionality. The core anime logic should remain in `SeriesApp.py` while the web layer provides REST API endpoints and a responsive UI.
## Architecture Principles
- **Single Responsibility**: Each file/class has one clear purpose
- **Dependency Injection**: Use FastAPI's dependency system
- **Clean Separation**: Web layer calls core logic, never the reverse
- **File Size Limit**: Maximum 500 lines per file
- **Type Hints**: Use comprehensive type annotations
- **Error Handling**: Proper exception handling and logging
## Additional Implementation Guidelines
### Code Style and Standards
- **Type Hints**: Use comprehensive type annotations throughout all modules
- **Docstrings**: Follow PEP 257 for function and class documentation
- **Error Handling**: Implement custom exception classes with meaningful messages
- **Logging**: Use structured logging with appropriate log levels
- **Security**: Validate all inputs and sanitize outputs
- **Performance**: Use async/await patterns for I/O operations
## 📞 Escalation
If you encounter:
- Architecture issues requiring design decisions
- Tests that conflict with documented requirements
- Breaking changes needed
- Unclear requirements or expectations
**Document the issue and escalate rather than guessing.**
---
## <20> Credentials
**Admin Login:**
- Username: `admin`
- Password: `Hallo123!`
---
## <20>📚 Helpful Commands
```bash
# Run all tests
conda run -n AniWorld python -m pytest tests/ -v --tb=short
# Run specific test file
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py -v
# Run specific test class
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService -v
# Run specific test
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService::test_broadcast_download_progress -v
# Run with extra verbosity
conda run -n AniWorld python -m pytest tests/ -vv
# Run with full traceback
conda run -n AniWorld python -m pytest tests/ -v --tb=long
# Run and stop at first failure
conda run -n AniWorld python -m pytest tests/ -v -x
# Run tests matching pattern
conda run -n AniWorld python -m pytest tests/ -v -k "auth"
# Show all print statements
conda run -n AniWorld python -m pytest tests/ -v -s
#Run app
conda run -n AniWorld python -m uvicorn src.server.fastapi_app:app --host 127.0.0.1 --port 8000 --reload
```
---
## Implementation Notes
1. **Incremental Development**: Implement features incrementally, testing each component thoroughly before moving to the next
2. **Code Review**: Review all generated code for adherence to project standards
3. **Documentation**: Document all public APIs and complex logic
4. **Testing**: Maintain test coverage above 80% for all new code
5. **Performance**: Profile and optimize critical paths, especially download and streaming operations
6. **Security**: Regular security audits and dependency updates
7. **Monitoring**: Implement comprehensive monitoring and alerting
8. **Maintenance**: Plan for regular maintenance and updates
---
## Task Completion Checklist
For each task completed:
- [ ] Implementation follows coding standards
- [ ] Unit tests written and passing
- [ ] Integration tests passing
- [ ] Documentation updated
- [ ] Error handling implemented
- [ ] Logging added
- [ ] Security considerations addressed
- [ ] Performance validated
- [ ] Code reviewed
- [ ] Task marked as complete in instructions.md
- [ ] Infrastructure.md updated and other docs
- [ ] Changes committed to git; keep your messages in git short and clear
- [ ] Take the next task
---
## TODO List:
Task completed! ✅
### Issue Fixed
Fixed the `RuntimeError: generator didn't stop after athrow()` error in the `/api/anime/add` endpoint.
**Root Cause:**
The error occurred when an `HTTPException` was raised in an endpoint after a database session was yielded from the `get_optional_database_session` dependency. The async generator didn't properly handle exceptions thrown back into it, causing Python's async context manager to fail with "generator didn't stop after athrow()".
**Solution:**
Added proper exception handling in both `get_database_session` and `get_optional_database_session` dependency functions by wrapping the yield statement in a try-except block that re-raises any exceptions, allowing FastAPI to handle them correctly.
**Changes Made:**
1. Fixed [src/server/utils/dependencies.py](src/server/utils/dependencies.py):
- Added try-except around yield in `get_database_session`
- Added try-except around yield in `get_optional_database_session`
2. Fixed [tests/api/test_anime_endpoints.py](tests/api/test_anime_endpoints.py):
- Added mock for `BackgroundLoaderService` to prevent initialization errors
- Updated test expectations to match 202 Accepted response status
**Tests:**
All 16 anime endpoint tests now pass successfully, including validation scenarios that raise HTTPExceptions.