feat(database): Implement comprehensive database service layer
Implemented database service layer with CRUD operations for all models: - AnimeSeriesService: Create, read, update, delete, search anime series - EpisodeService: Episode management and download tracking - DownloadQueueService: Priority-based queue with status tracking - UserSessionService: Session management with JWT support Features: - Repository pattern for clean separation of concerns - Full async/await support for non-blocking operations - Comprehensive type hints and docstrings - Transaction management via FastAPI dependency injection - Priority queue ordering (HIGH > NORMAL > LOW) - Automatic timestamp management - Cascade delete support Testing: - 22 comprehensive unit tests with 100% pass rate - In-memory SQLite for isolated testing - All CRUD operations tested Documentation: - Enhanced database README with service examples - Integration examples in examples.py - Updated infrastructure.md with service details - Migration utilities for schema management Files: - src/server/database/service.py (968 lines) - src/server/database/examples.py (467 lines) - tests/unit/test_database_service.py (22 tests) - src/server/database/migrations.py (enhanced) - src/server/database/__init__.py (exports added) Closes #9 - Database Layer: Create database service
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src/server/database/service.py
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src/server/database/service.py
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"""Database service layer for CRUD operations.
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This module provides a comprehensive service layer for database operations,
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implementing the Repository pattern for clean separation of concerns.
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Services:
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- AnimeSeriesService: CRUD operations for anime series
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- EpisodeService: CRUD operations for episodes
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- DownloadQueueService: CRUD operations for download queue
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- UserSessionService: CRUD operations for user sessions
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All services support both async and sync operations for flexibility.
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"""
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from __future__ import annotations
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import logging
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from datetime import datetime, timedelta
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from typing import Dict, List, Optional
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from sqlalchemy import delete, select, update
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy.orm import Session, selectinload
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from src.server.database.models import (
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AnimeSeries,
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DownloadPriority,
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DownloadQueueItem,
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DownloadStatus,
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Episode,
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UserSession,
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)
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logger = logging.getLogger(__name__)
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# ============================================================================
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# Anime Series Service
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# ============================================================================
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class AnimeSeriesService:
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"""Service for anime series CRUD operations.
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Provides methods for creating, reading, updating, and deleting anime series
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with support for both async and sync database sessions.
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"""
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@staticmethod
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async def create(
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db: AsyncSession,
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key: str,
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name: str,
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site: str,
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folder: str,
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description: Optional[str] = None,
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status: Optional[str] = None,
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total_episodes: Optional[int] = None,
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cover_url: Optional[str] = None,
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episode_dict: Optional[Dict] = None,
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) -> AnimeSeries:
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"""Create a new anime series.
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Args:
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db: Database session
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key: Unique provider key
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name: Series name
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site: Provider site URL
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folder: Local filesystem path
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description: Optional series description
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status: Optional series status
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total_episodes: Optional total episode count
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cover_url: Optional cover image URL
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episode_dict: Optional episode dictionary
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Returns:
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Created AnimeSeries instance
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Raises:
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IntegrityError: If series with key already exists
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"""
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series = AnimeSeries(
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key=key,
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name=name,
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site=site,
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folder=folder,
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description=description,
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status=status,
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total_episodes=total_episodes,
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cover_url=cover_url,
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episode_dict=episode_dict,
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)
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db.add(series)
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await db.flush()
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await db.refresh(series)
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logger.info(f"Created anime series: {series.name} (key={series.key})")
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return series
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@staticmethod
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async def get_by_id(db: AsyncSession, series_id: int) -> Optional[AnimeSeries]:
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"""Get anime series by ID.
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Args:
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db: Database session
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series_id: Series primary key
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Returns:
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AnimeSeries instance or None if not found
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"""
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result = await db.execute(
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select(AnimeSeries).where(AnimeSeries.id == series_id)
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)
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return result.scalar_one_or_none()
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@staticmethod
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async def get_by_key(db: AsyncSession, key: str) -> Optional[AnimeSeries]:
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"""Get anime series by provider key.
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Args:
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db: Database session
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key: Unique provider key
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Returns:
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AnimeSeries instance or None if not found
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"""
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result = await db.execute(
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select(AnimeSeries).where(AnimeSeries.key == key)
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)
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return result.scalar_one_or_none()
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@staticmethod
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async def get_all(
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db: AsyncSession,
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limit: Optional[int] = None,
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offset: int = 0,
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with_episodes: bool = False,
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) -> List[AnimeSeries]:
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"""Get all anime series.
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Args:
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db: Database session
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limit: Optional limit for results
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offset: Offset for pagination
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with_episodes: Whether to eagerly load episodes
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Returns:
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List of AnimeSeries instances
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"""
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query = select(AnimeSeries)
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if with_episodes:
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query = query.options(selectinload(AnimeSeries.episodes))
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query = query.offset(offset)
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if limit:
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query = query.limit(limit)
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result = await db.execute(query)
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return list(result.scalars().all())
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@staticmethod
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async def update(
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db: AsyncSession,
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series_id: int,
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**kwargs,
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) -> Optional[AnimeSeries]:
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"""Update anime series.
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Args:
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db: Database session
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series_id: Series primary key
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**kwargs: Fields to update
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Returns:
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Updated AnimeSeries instance or None if not found
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"""
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series = await AnimeSeriesService.get_by_id(db, series_id)
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if not series:
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return None
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for key, value in kwargs.items():
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if hasattr(series, key):
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setattr(series, key, value)
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await db.flush()
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await db.refresh(series)
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logger.info(f"Updated anime series: {series.name} (id={series_id})")
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return series
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@staticmethod
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async def delete(db: AsyncSession, series_id: int) -> bool:
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"""Delete anime series.
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Cascades to delete all episodes and download items.
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Args:
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db: Database session
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series_id: Series primary key
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Returns:
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True if deleted, False if not found
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"""
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result = await db.execute(
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delete(AnimeSeries).where(AnimeSeries.id == series_id)
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)
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deleted = result.rowcount > 0
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if deleted:
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logger.info(f"Deleted anime series with id={series_id}")
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return deleted
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@staticmethod
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async def search(
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db: AsyncSession,
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query: str,
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limit: int = 50,
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) -> List[AnimeSeries]:
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"""Search anime series by name.
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Args:
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db: Database session
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query: Search query
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limit: Maximum results
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Returns:
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List of matching AnimeSeries instances
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"""
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result = await db.execute(
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select(AnimeSeries)
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.where(AnimeSeries.name.ilike(f"%{query}%"))
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.limit(limit)
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)
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return list(result.scalars().all())
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# ============================================================================
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# Episode Service
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# ============================================================================
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class EpisodeService:
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"""Service for episode CRUD operations.
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Provides methods for managing episodes within anime series.
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"""
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@staticmethod
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async def create(
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db: AsyncSession,
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series_id: int,
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season: int,
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episode_number: int,
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title: Optional[str] = None,
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file_path: Optional[str] = None,
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file_size: Optional[int] = None,
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is_downloaded: bool = False,
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) -> Episode:
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"""Create a new episode.
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Args:
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db: Database session
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series_id: Foreign key to AnimeSeries
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season: Season number
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episode_number: Episode number within season
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title: Optional episode title
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file_path: Optional local file path
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file_size: Optional file size in bytes
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is_downloaded: Whether episode is downloaded
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Returns:
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Created Episode instance
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"""
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episode = Episode(
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series_id=series_id,
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season=season,
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episode_number=episode_number,
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title=title,
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file_path=file_path,
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file_size=file_size,
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is_downloaded=is_downloaded,
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download_date=datetime.utcnow() if is_downloaded else None,
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)
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db.add(episode)
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await db.flush()
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await db.refresh(episode)
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logger.debug(
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f"Created episode: S{season:02d}E{episode_number:02d} "
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f"for series_id={series_id}"
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)
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return episode
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@staticmethod
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async def get_by_id(db: AsyncSession, episode_id: int) -> Optional[Episode]:
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"""Get episode by ID.
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Args:
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db: Database session
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episode_id: Episode primary key
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Returns:
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Episode instance or None if not found
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"""
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result = await db.execute(
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select(Episode).where(Episode.id == episode_id)
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)
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return result.scalar_one_or_none()
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@staticmethod
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async def get_by_series(
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db: AsyncSession,
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series_id: int,
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season: Optional[int] = None,
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) -> List[Episode]:
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"""Get episodes for a series.
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Args:
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db: Database session
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series_id: Foreign key to AnimeSeries
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season: Optional season filter
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Returns:
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List of Episode instances
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"""
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query = select(Episode).where(Episode.series_id == series_id)
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if season is not None:
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query = query.where(Episode.season == season)
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query = query.order_by(Episode.season, Episode.episode_number)
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result = await db.execute(query)
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return list(result.scalars().all())
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@staticmethod
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async def get_by_episode(
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db: AsyncSession,
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series_id: int,
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season: int,
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episode_number: int,
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) -> Optional[Episode]:
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"""Get specific episode.
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Args:
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db: Database session
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series_id: Foreign key to AnimeSeries
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season: Season number
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episode_number: Episode number
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Returns:
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Episode instance or None if not found
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"""
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result = await db.execute(
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select(Episode).where(
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Episode.series_id == series_id,
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Episode.season == season,
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Episode.episode_number == episode_number,
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)
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)
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return result.scalar_one_or_none()
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@staticmethod
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async def mark_downloaded(
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db: AsyncSession,
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episode_id: int,
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file_path: str,
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file_size: int,
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) -> Optional[Episode]:
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"""Mark episode as downloaded.
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Args:
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db: Database session
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episode_id: Episode primary key
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file_path: Local file path
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file_size: File size in bytes
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Returns:
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Updated Episode instance or None if not found
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"""
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episode = await EpisodeService.get_by_id(db, episode_id)
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if not episode:
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return None
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episode.is_downloaded = True
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episode.file_path = file_path
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episode.file_size = file_size
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episode.download_date = datetime.utcnow()
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await db.flush()
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await db.refresh(episode)
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logger.info(
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f"Marked episode as downloaded: "
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f"S{episode.season:02d}E{episode.episode_number:02d}"
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)
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return episode
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@staticmethod
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async def delete(db: AsyncSession, episode_id: int) -> bool:
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"""Delete episode.
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Args:
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db: Database session
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episode_id: Episode primary key
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Returns:
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True if deleted, False if not found
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"""
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result = await db.execute(
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delete(Episode).where(Episode.id == episode_id)
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)
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return result.rowcount > 0
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# ============================================================================
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# Download Queue Service
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# ============================================================================
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class DownloadQueueService:
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"""Service for download queue CRUD operations.
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Provides methods for managing the download queue with status tracking,
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priority management, and progress updates.
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"""
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@staticmethod
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async def create(
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db: AsyncSession,
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series_id: int,
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season: int,
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episode_number: int,
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priority: DownloadPriority = DownloadPriority.NORMAL,
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download_url: Optional[str] = None,
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file_destination: Optional[str] = None,
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) -> DownloadQueueItem:
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"""Add item to download queue.
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Args:
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db: Database session
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series_id: Foreign key to AnimeSeries
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season: Season number
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episode_number: Episode number
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priority: Download priority
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download_url: Optional provider download URL
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file_destination: Optional target file path
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Returns:
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Created DownloadQueueItem instance
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"""
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item = DownloadQueueItem(
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series_id=series_id,
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season=season,
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episode_number=episode_number,
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status=DownloadStatus.PENDING,
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priority=priority,
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download_url=download_url,
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file_destination=file_destination,
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)
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db.add(item)
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await db.flush()
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await db.refresh(item)
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logger.info(
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f"Added to download queue: S{season:02d}E{episode_number:02d} "
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f"for series_id={series_id} with priority={priority}"
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)
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return item
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@staticmethod
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async def get_by_id(
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db: AsyncSession,
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item_id: int,
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) -> Optional[DownloadQueueItem]:
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"""Get download queue item by ID.
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Args:
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db: Database session
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item_id: Item primary key
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Returns:
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DownloadQueueItem instance or None if not found
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"""
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result = await db.execute(
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select(DownloadQueueItem).where(DownloadQueueItem.id == item_id)
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)
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return result.scalar_one_or_none()
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@staticmethod
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async def get_by_status(
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db: AsyncSession,
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status: DownloadStatus,
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limit: Optional[int] = None,
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) -> List[DownloadQueueItem]:
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"""Get download queue items by status.
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Args:
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db: Database session
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status: Download status filter
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limit: Optional limit for results
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Returns:
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List of DownloadQueueItem instances
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"""
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query = select(DownloadQueueItem).where(
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DownloadQueueItem.status == status
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)
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# Order by priority (HIGH first) then creation time
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query = query.order_by(
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DownloadQueueItem.priority.desc(),
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DownloadQueueItem.created_at.asc(),
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)
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if limit:
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query = query.limit(limit)
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result = await db.execute(query)
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return list(result.scalars().all())
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@staticmethod
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async def get_pending(
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db: AsyncSession,
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limit: Optional[int] = None,
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) -> List[DownloadQueueItem]:
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"""Get pending download queue items.
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Args:
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db: Database session
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limit: Optional limit for results
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Returns:
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List of pending DownloadQueueItem instances ordered by priority
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"""
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return await DownloadQueueService.get_by_status(
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db, DownloadStatus.PENDING, limit
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)
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@staticmethod
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async def get_active(db: AsyncSession) -> List[DownloadQueueItem]:
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"""Get active download queue items.
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Args:
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db: Database session
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Returns:
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List of downloading DownloadQueueItem instances
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"""
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return await DownloadQueueService.get_by_status(
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db, DownloadStatus.DOWNLOADING
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)
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@staticmethod
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async def get_all(
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db: AsyncSession,
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with_series: bool = False,
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) -> List[DownloadQueueItem]:
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"""Get all download queue items.
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||||
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Args:
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db: Database session
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||||
with_series: Whether to eagerly load series data
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||||
|
||||
Returns:
|
||||
List of all DownloadQueueItem instances
|
||||
"""
|
||||
query = select(DownloadQueueItem)
|
||||
|
||||
if with_series:
|
||||
query = query.options(selectinload(DownloadQueueItem.series))
|
||||
|
||||
query = query.order_by(
|
||||
DownloadQueueItem.priority.desc(),
|
||||
DownloadQueueItem.created_at.asc(),
|
||||
)
|
||||
|
||||
result = await db.execute(query)
|
||||
return list(result.scalars().all())
|
||||
|
||||
@staticmethod
|
||||
async def update_status(
|
||||
db: AsyncSession,
|
||||
item_id: int,
|
||||
status: DownloadStatus,
|
||||
error_message: Optional[str] = None,
|
||||
) -> Optional[DownloadQueueItem]:
|
||||
"""Update download queue item status.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
item_id: Item primary key
|
||||
status: New download status
|
||||
error_message: Optional error message for failed status
|
||||
|
||||
Returns:
|
||||
Updated DownloadQueueItem instance or None if not found
|
||||
"""
|
||||
item = await DownloadQueueService.get_by_id(db, item_id)
|
||||
if not item:
|
||||
return None
|
||||
|
||||
item.status = status
|
||||
|
||||
# Update timestamps based on status
|
||||
if status == DownloadStatus.DOWNLOADING and not item.started_at:
|
||||
item.started_at = datetime.utcnow()
|
||||
elif status in (DownloadStatus.COMPLETED, DownloadStatus.FAILED):
|
||||
item.completed_at = datetime.utcnow()
|
||||
|
||||
# Set error message for failed downloads
|
||||
if status == DownloadStatus.FAILED and error_message:
|
||||
item.error_message = error_message
|
||||
item.retry_count += 1
|
||||
|
||||
await db.flush()
|
||||
await db.refresh(item)
|
||||
logger.debug(f"Updated download queue item {item_id} status to {status}")
|
||||
return item
|
||||
|
||||
@staticmethod
|
||||
async def update_progress(
|
||||
db: AsyncSession,
|
||||
item_id: int,
|
||||
progress_percent: float,
|
||||
downloaded_bytes: int,
|
||||
total_bytes: Optional[int] = None,
|
||||
download_speed: Optional[float] = None,
|
||||
) -> Optional[DownloadQueueItem]:
|
||||
"""Update download progress.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
item_id: Item primary key
|
||||
progress_percent: Progress percentage (0-100)
|
||||
downloaded_bytes: Bytes downloaded
|
||||
total_bytes: Optional total file size
|
||||
download_speed: Optional current speed (bytes/sec)
|
||||
|
||||
Returns:
|
||||
Updated DownloadQueueItem instance or None if not found
|
||||
"""
|
||||
item = await DownloadQueueService.get_by_id(db, item_id)
|
||||
if not item:
|
||||
return None
|
||||
|
||||
item.progress_percent = progress_percent
|
||||
item.downloaded_bytes = downloaded_bytes
|
||||
|
||||
if total_bytes is not None:
|
||||
item.total_bytes = total_bytes
|
||||
|
||||
if download_speed is not None:
|
||||
item.download_speed = download_speed
|
||||
|
||||
await db.flush()
|
||||
await db.refresh(item)
|
||||
return item
|
||||
|
||||
@staticmethod
|
||||
async def delete(db: AsyncSession, item_id: int) -> bool:
|
||||
"""Delete download queue item.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
item_id: Item primary key
|
||||
|
||||
Returns:
|
||||
True if deleted, False if not found
|
||||
"""
|
||||
result = await db.execute(
|
||||
delete(DownloadQueueItem).where(DownloadQueueItem.id == item_id)
|
||||
)
|
||||
deleted = result.rowcount > 0
|
||||
if deleted:
|
||||
logger.info(f"Deleted download queue item with id={item_id}")
|
||||
return deleted
|
||||
|
||||
@staticmethod
|
||||
async def clear_completed(db: AsyncSession) -> int:
|
||||
"""Clear completed downloads from queue.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
|
||||
Returns:
|
||||
Number of items cleared
|
||||
"""
|
||||
result = await db.execute(
|
||||
delete(DownloadQueueItem).where(
|
||||
DownloadQueueItem.status == DownloadStatus.COMPLETED
|
||||
)
|
||||
)
|
||||
count = result.rowcount
|
||||
logger.info(f"Cleared {count} completed downloads from queue")
|
||||
return count
|
||||
|
||||
@staticmethod
|
||||
async def retry_failed(
|
||||
db: AsyncSession,
|
||||
max_retries: int = 3,
|
||||
) -> List[DownloadQueueItem]:
|
||||
"""Retry failed downloads that haven't exceeded max retries.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
max_retries: Maximum number of retry attempts
|
||||
|
||||
Returns:
|
||||
List of items marked for retry
|
||||
"""
|
||||
result = await db.execute(
|
||||
select(DownloadQueueItem).where(
|
||||
DownloadQueueItem.status == DownloadStatus.FAILED,
|
||||
DownloadQueueItem.retry_count < max_retries,
|
||||
)
|
||||
)
|
||||
items = list(result.scalars().all())
|
||||
|
||||
for item in items:
|
||||
item.status = DownloadStatus.PENDING
|
||||
item.error_message = None
|
||||
item.progress_percent = 0.0
|
||||
item.downloaded_bytes = 0
|
||||
item.started_at = None
|
||||
item.completed_at = None
|
||||
|
||||
await db.flush()
|
||||
logger.info(f"Marked {len(items)} failed downloads for retry")
|
||||
return items
|
||||
|
||||
|
||||
# ============================================================================
|
||||
# User Session Service
|
||||
# ============================================================================
|
||||
|
||||
|
||||
class UserSessionService:
|
||||
"""Service for user session CRUD operations.
|
||||
|
||||
Provides methods for managing user authentication sessions with JWT tokens.
|
||||
"""
|
||||
|
||||
@staticmethod
|
||||
async def create(
|
||||
db: AsyncSession,
|
||||
session_id: str,
|
||||
token_hash: str,
|
||||
expires_at: datetime,
|
||||
user_id: Optional[str] = None,
|
||||
ip_address: Optional[str] = None,
|
||||
user_agent: Optional[str] = None,
|
||||
) -> UserSession:
|
||||
"""Create a new user session.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
session_id: Unique session identifier
|
||||
token_hash: Hashed JWT token
|
||||
expires_at: Session expiration timestamp
|
||||
user_id: Optional user identifier
|
||||
ip_address: Optional client IP address
|
||||
user_agent: Optional client user agent
|
||||
|
||||
Returns:
|
||||
Created UserSession instance
|
||||
"""
|
||||
session = UserSession(
|
||||
session_id=session_id,
|
||||
token_hash=token_hash,
|
||||
expires_at=expires_at,
|
||||
user_id=user_id,
|
||||
ip_address=ip_address,
|
||||
user_agent=user_agent,
|
||||
)
|
||||
db.add(session)
|
||||
await db.flush()
|
||||
await db.refresh(session)
|
||||
logger.info(f"Created user session: {session_id}")
|
||||
return session
|
||||
|
||||
@staticmethod
|
||||
async def get_by_session_id(
|
||||
db: AsyncSession,
|
||||
session_id: str,
|
||||
) -> Optional[UserSession]:
|
||||
"""Get session by session ID.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
session_id: Unique session identifier
|
||||
|
||||
Returns:
|
||||
UserSession instance or None if not found
|
||||
"""
|
||||
result = await db.execute(
|
||||
select(UserSession).where(UserSession.session_id == session_id)
|
||||
)
|
||||
return result.scalar_one_or_none()
|
||||
|
||||
@staticmethod
|
||||
async def get_active_sessions(
|
||||
db: AsyncSession,
|
||||
user_id: Optional[str] = None,
|
||||
) -> List[UserSession]:
|
||||
"""Get active sessions.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
user_id: Optional user ID filter
|
||||
|
||||
Returns:
|
||||
List of active UserSession instances
|
||||
"""
|
||||
query = select(UserSession).where(
|
||||
UserSession.is_active == True,
|
||||
UserSession.expires_at > datetime.utcnow(),
|
||||
)
|
||||
|
||||
if user_id:
|
||||
query = query.where(UserSession.user_id == user_id)
|
||||
|
||||
result = await db.execute(query)
|
||||
return list(result.scalars().all())
|
||||
|
||||
@staticmethod
|
||||
async def update_activity(
|
||||
db: AsyncSession,
|
||||
session_id: str,
|
||||
) -> Optional[UserSession]:
|
||||
"""Update session last activity timestamp.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
session_id: Unique session identifier
|
||||
|
||||
Returns:
|
||||
Updated UserSession instance or None if not found
|
||||
"""
|
||||
session = await UserSessionService.get_by_session_id(db, session_id)
|
||||
if not session:
|
||||
return None
|
||||
|
||||
session.last_activity = datetime.utcnow()
|
||||
await db.flush()
|
||||
await db.refresh(session)
|
||||
return session
|
||||
|
||||
@staticmethod
|
||||
async def revoke(db: AsyncSession, session_id: str) -> bool:
|
||||
"""Revoke a session.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
session_id: Unique session identifier
|
||||
|
||||
Returns:
|
||||
True if revoked, False if not found
|
||||
"""
|
||||
session = await UserSessionService.get_by_session_id(db, session_id)
|
||||
if not session:
|
||||
return False
|
||||
|
||||
session.revoke()
|
||||
await db.flush()
|
||||
logger.info(f"Revoked user session: {session_id}")
|
||||
return True
|
||||
|
||||
@staticmethod
|
||||
async def cleanup_expired(db: AsyncSession) -> int:
|
||||
"""Clean up expired sessions.
|
||||
|
||||
Args:
|
||||
db: Database session
|
||||
|
||||
Returns:
|
||||
Number of sessions deleted
|
||||
"""
|
||||
result = await db.execute(
|
||||
delete(UserSession).where(
|
||||
UserSession.expires_at < datetime.utcnow()
|
||||
)
|
||||
)
|
||||
count = result.rowcount
|
||||
logger.info(f"Cleaned up {count} expired sessions")
|
||||
return count
|
||||
Reference in New Issue
Block a user