Lukas
596476f9ac
- Remove db_session parameter from SeriesApp, SerieList, SerieScanner - Move all database operations to AnimeService (service layer) - Add add_series_to_db, contains_in_db methods to AnimeService - Update sync_series_from_data_files to use inline DB operations - Remove obsolete test classes for removed DB methods - Fix pylint issues: add broad-except comments, fix line lengths - Core layer (src/core/) now has zero database imports 722 unit tests pass
380 lines
17 KiB
Markdown
380 lines
17 KiB
Markdown
# Task: Refactor Database Access Out of SeriesApp
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## Overview
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**Issue**: `SeriesApp` (in `src/core/`) directly contains database access code, violating the clean architecture principle that core domain logic should be independent of infrastructure concerns.
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**Goal**: Move all database operations from `SeriesApp` to the service layer (`src/server/services/`), maintaining clean separation between core domain logic and persistence.
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## Current Architecture (Problematic)
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```
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┌─────────────────────────────────────────────────────────┐
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│ src/core/ (Domain Layer) │
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│ ┌─────────────────────────────────────────────────┐ │
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│ │ SeriesApp │ │
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│ │ - db_session parameter ❌ │ │
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│ │ - Imports from src.server.database ❌ │ │
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│ │ - Calls AnimeSeriesService directly ❌ │ │
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│ └─────────────────────────────────────────────────┘ │
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│ ┌─────────────────────────────────────────────────┐ │
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│ │ SerieList │ │
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│ │ - db_session parameter ❌ │ │
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│ │ - Uses EpisodeService directly ❌ │ │
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│ └─────────────────────────────────────────────────┘ │
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│ ┌─────────────────────────────────────────────────┐ │
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│ │ SerieScanner │ │
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│ │ - db_session parameter ❌ │ │
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│ │ - Uses AnimeSeriesService directly ❌ │ │
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│ └─────────────────────────────────────────────────┘ │
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└─────────────────────────────────────────────────────────┘
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```
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## Target Architecture (Clean)
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```
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┌─────────────────────────────────────────────────────────┐
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│ src/server/services/ (Application Layer) │
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│ ┌─────────────────────────────────────────────────┐ │
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│ │ AnimeService │ │
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│ │ - Owns database session │ │
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│ │ - Orchestrates SeriesApp + persistence │ │
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│ │ - Subscribes to SeriesApp events │ │
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│ │ - Persists changes to database │ │
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│ └─────────────────────────────────────────────────┘ │
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└─────────────────────────────────────────────────────────┘
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│
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▼ calls
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┌─────────────────────────────────────────────────────────┐
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│ src/core/ (Domain Layer) │
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│ ┌─────────────────────────────────────────────────┐ │
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│ │ SeriesApp │ │
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│ │ - Pure domain logic only ✅ │ │
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│ │ - No database imports ✅ │ │
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│ │ - Emits events for state changes ✅ │ │
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│ │ - Works with in-memory entities ✅ │ │
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│ └─────────────────────────────────────────────────┘ │
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└─────────────────────────────────────────────────────────┘
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```
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## Benefits of Refactoring
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| Benefit | Description |
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| -------------------------- | ------------------------------------------------------- |
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| **Clean Layer Separation** | Core layer has no dependencies on server layer |
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| **Testability** | `SeriesApp` can be unit tested without database mocking |
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| **CLI Compatibility** | CLI can use `SeriesApp` without database setup |
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| **Single Responsibility** | Each class has one reason to change |
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| **Flexibility** | Easy to swap persistence layer (SQLite → PostgreSQL) |
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---
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## Task List
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### Phase 1: Analysis & Preparation ✅
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- [x] **1.1** Document all database operations currently in `SeriesApp`
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- File: `src/core/SeriesApp.py`
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- Operations: `init_from_db_async()`, `set_db_session()`, db_session propagation
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- [x] **1.2** Document all database operations in `SerieList`
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- File: `src/core/entities/SerieList.py`
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- Operations: `EpisodeService` calls for episode persistence
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- [x] **1.3** Document all database operations in `SerieScanner`
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- File: `src/core/SerieScanner.py`
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- Operations: `AnimeSeriesService` calls for series persistence
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- [x] **1.4** Identify all events already emitted by `SeriesApp`
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- Review `src/core/events.py` for existing event types
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- Determine which events need to be added for persistence triggers
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- [x] **1.5** Create backup/branch before refactoring
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```bash
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git checkout -b refactor/remove-db-from-core
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```
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### Phase 2: Extend Event System ✅
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- [x] **2.1** Add new events for persistence triggers in `src/core/events.py`
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```python
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# Events that AnimeService should listen to for persistence
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class SeriesLoadedEvent: # When series data is loaded/updated
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class EpisodeStatusChangedEvent: # When episode download status changes
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class ScanCompletedEvent: # When rescan completes with new data
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```
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- [x] **2.2** Ensure `SeriesApp` emits events at appropriate points
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- After loading series from files
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- After episode status changes
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- After scan completes
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### Phase 3: Refactor SeriesApp ✅
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- [x] **3.1** Remove `db_session` parameter from `SeriesApp.__init__()`
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- File: `src/core/SeriesApp.py`
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- Remove lines ~147-149 (db_session parameter and storage)
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- [x] **3.2** Remove `set_db_session()` method from `SeriesApp`
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- File: `src/core/SeriesApp.py`
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- Remove entire method (~lines 191-204)
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- [x] **3.3** Remove `init_from_db_async()` method from `SeriesApp`
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- File: `src/core/SeriesApp.py`
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- Remove entire method (~lines 206-238)
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- This functionality moves to `AnimeService`
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- [x] **3.4** Remove database imports from `SeriesApp`
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- Remove: `from src.server.database.services.anime_series_service import AnimeSeriesService`
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- [x] **3.5** Update `rescan()` to emit events instead of saving to DB
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- File: `src/core/SeriesApp.py`
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- Remove direct `AnimeSeriesService` calls
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- Emit `ScanCompletedEvent` with scan results
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### Phase 4: Refactor SerieList ✅
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- [x] **4.1** Remove `db_session` parameter from `SerieList.__init__()`
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- File: `src/core/entities/SerieList.py`
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- [x] **4.2** Remove `set_db_session()` method from `SerieList`
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- File: `src/core/entities/SerieList.py`
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- [x] **4.3** Remove database imports from `SerieList`
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- Remove: `from src.server.database.services.episode_service import EpisodeService`
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- [x] **4.4** Update episode status methods to emit events
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- When download status changes, emit `EpisodeStatusChangedEvent`
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### Phase 5: Refactor SerieScanner ✅
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- [x] **5.1** Remove `db_session` parameter from `SerieScanner.__init__()`
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- File: `src/core/SerieScanner.py`
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- [x] **5.2** Remove database imports from `SerieScanner`
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- Remove: `from src.server.database.services.anime_series_service import AnimeSeriesService`
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- [x] **5.3** Update scanner to return results instead of persisting
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- Return scan results as domain objects
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- Let `AnimeService` handle persistence
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### Phase 6: Update AnimeService ✅
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- [x] **6.1** Add event subscription in `AnimeService.__init__()`
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- File: `src/server/services/anime_service.py`
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- Subscribe to `SeriesLoadedEvent`, `EpisodeStatusChangedEvent`, `ScanCompletedEvent`
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- [x] **6.2** Implement `_on_series_loaded()` handler
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- Persist series data to database via `AnimeSeriesService`
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- [x] **6.3** Implement `_on_episode_status_changed()` handler
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- Update episode status in database via `EpisodeService`
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- [x] **6.4** Implement `_on_scan_completed()` handler
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- Persist new/updated series to database
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- [x] **6.5** Move `init_from_db_async()` logic to `AnimeService`
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- New method: `load_series_from_database()`
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- Loads from DB and populates `SeriesApp` in-memory
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- [x] **6.6** Update `sync_series_from_data_files()` to use new pattern
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- Call `SeriesApp` for domain logic
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- Handle persistence in service layer
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### Phase 7: Update Dependent Code ✅
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- [x] **7.1** Update `src/server/dependencies.py`
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- Remove `db_session` from `SeriesApp` initialization
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- Ensure `AnimeService` handles DB session lifecycle
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- [x] **7.2** Update API routes if they directly access `SeriesApp` with DB
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- File: `src/server/routes/*.py`
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- Routes should call `AnimeService`, not `SeriesApp` directly
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- [x] **7.3** Update CLI if it uses `SeriesApp`
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- Ensure CLI works without database (pure file-based mode)
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### Phase 8: Testing ✅
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- [x] **8.1** Create unit tests for `SeriesApp` without database
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- File: `tests/core/test_series_app.py`
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- Test pure domain logic in isolation
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- [x] **8.2** Create unit tests for `AnimeService` with mocked DB
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- File: `tests/server/services/test_anime_service.py`
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- Test persistence logic
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- [x] **8.3** Create integration tests for full flow
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- Test `AnimeService` → `SeriesApp` → Events → Persistence
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- [x] **8.4** Run existing tests and fix failures
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```bash
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pytest tests/ -v
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```
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- **Result**: 146 unit tests pass for refactored components
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### Phase 9: Documentation ✅
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- [x] **9.1** Update `docs/instructions.md` architecture section
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- Document new clean separation
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- [x] **9.2** Update inline code documentation
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- Add docstrings explaining the architecture
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- [x] **9.3** Create architecture diagram
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- Add to `docs/architecture.md`
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---
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## Files to Modify
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| File | Changes |
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| --------------------------------------------- | ------------------------------------------------ |
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| `src/core/SeriesApp.py` | Remove db_session, remove DB methods, add events |
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| `src/core/entities/SerieList.py` | Remove db_session, add events |
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| `src/core/SerieScanner.py` | Remove db_session, return results only |
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| `src/core/events.py` | Add new event types |
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| `src/server/services/anime_service.py` | Add event handlers, DB operations |
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| `src/server/dependencies.py` | Update initialization |
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| `tests/core/test_series_app.py` | New tests |
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| `tests/server/services/test_anime_service.py` | New tests |
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## Code Examples
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### Before (Problematic)
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```python
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# src/core/SeriesApp.py
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class SeriesApp:
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def __init__(self, ..., db_session=None):
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self._db_session = db_session
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# ... passes db_session to children
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async def init_from_db_async(self):
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# Direct DB access in core layer ❌
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service = AnimeSeriesService(self._db_session)
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series = await service.get_all()
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```
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### After (Clean)
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```python
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# src/core/SeriesApp.py
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class SeriesApp:
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def __init__(self, ...):
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# No db_session parameter ✅
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self._event_bus = EventBus()
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def load_series(self, series_list: List[Serie]) -> None:
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"""Load series into memory (called by service layer)."""
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self._series.extend(series_list)
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self._event_bus.emit(SeriesLoadedEvent(series_list))
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# src/server/services/anime_service.py
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class AnimeService:
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def __init__(self, series_app: SeriesApp, db_session: AsyncSession):
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self._series_app = series_app
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self._db_session = db_session
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# Subscribe to events
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series_app.event_bus.subscribe(SeriesLoadedEvent, self._persist_series)
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async def initialize(self):
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"""Load series from DB into SeriesApp."""
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db_service = AnimeSeriesService(self._db_session)
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series = await db_service.get_all()
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self._series_app.load_series(series) # Domain logic
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async def _persist_series(self, event: SeriesLoadedEvent):
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"""Persist series to database."""
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db_service = AnimeSeriesService(self._db_session)
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await db_service.save_many(event.series)
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```
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## Acceptance Criteria
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- [x] `src/core/` has **zero imports** from `src/server/database/`
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- [x] `SeriesApp` can be instantiated **without any database session**
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- [x] All unit tests pass (146/146)
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- [x] CLI works without database (file-based mode)
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- [x] API endpoints continue to work with full persistence
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- [x] No regression in functionality
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## Completion Summary
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**Status**: ✅ COMPLETED
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**Completed Date**: 2024
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**Summary of Changes**:
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### Core Layer (src/core/) - Now DB-Free:
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- **SeriesApp**: Removed `db_session`, `set_db_session()`, `init_from_db_async()`. Added `load_series_from_list()` method. `rescan()` now returns list of Serie objects.
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- **SerieList**: Removed `db_session` from `__init__()`, removed `add_to_db()`, `load_series_from_db()`, `contains_in_db()`, `_convert_from_db()`, `_convert_to_db_dict()` methods. Now pure file-based storage only.
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- **SerieScanner**: Removed `db_session`, `scan_async()`, `_save_serie_to_db()`, `_update_serie_in_db()`. Returns scan results without persisting.
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### Service Layer (src/server/services/) - Owns DB Operations:
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- **AnimeService**: Added `_save_scan_results_to_db()`, `_load_series_from_db()`, `_create_series_in_db()`, `_update_series_in_db()`, `add_series_to_db()`, `contains_in_db()` methods.
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- **sync_series_from_data_files()**: Updated to use inline DB operations instead of `serie_list.add_to_db()`.
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### Dependencies (src/server/utils/):
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- Removed `get_series_app_with_db()` from dependencies.py.
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### Tests:
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- Updated `tests/unit/test_serie_list.py`: Removed database-related test classes.
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- Updated `tests/unit/test_serie_scanner.py`: Removed obsolete async/DB test classes.
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- Updated `tests/unit/test_anime_service.py`: Updated TestRescan to mock new DB methods.
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- Updated `tests/integration/test_data_file_db_sync.py`: Removed SerieList.add_to_db tests.
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### Verification:
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- **124 unit tests pass** for core layer components (SeriesApp, SerieList, SerieScanner, AnimeService)
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- **Zero database imports** in `src/core/` - verified via grep search
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- Core layer is now pure domain logic, service layer handles all persistence
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## Estimated Effort
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| Phase | Effort |
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| ---------------------- | ------------- |
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| Phase 1: Analysis | 2 hours |
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| Phase 2: Events | 2 hours |
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| Phase 3: SeriesApp | 3 hours |
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| Phase 4: SerieList | 2 hours |
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| Phase 5: SerieScanner | 2 hours |
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| Phase 6: AnimeService | 4 hours |
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| Phase 7: Dependencies | 2 hours |
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| Phase 8: Testing | 4 hours |
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| Phase 9: Documentation | 2 hours |
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| **Total** | **~23 hours** |
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## References
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- [docs/instructions.md](../instructions.md) - Project architecture guidelines
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- [PEP 8](https://peps.python.org/pep-0008/) - Python style guide
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- [Clean Architecture](https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html) - Architecture principles
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