perf: migrate to async architecture with Quart and optimize resource …

[kleeedolinux]

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Summary

This PR refactors the Python RPC server to use async/await architecture, significantly improving performance, reducing memory and CPU usage, and enabling better concurrent request handling.

Changes

Framework Migration

• Replaced Flask with Quart: Migrated from synchronous Flask to async-compatible Quart framework, maintaining API compatibility while enabling async request handling
• Added uvloop support: Integrated uvloop event loop policy for Linux/Mac systems, providing up to 2-4x performance improvement over the default asyncio event loop

Async Conversion

• HTTP Downloaders: Converted HttpDownloader and HttpMultiLinkDownloader to fully async operations using asyncio.to_thread() for blocking I/O
• Torrent Downloader: Refactored TorrentDownloader to use async methods with proper thread pool execution
• Image Processor: Made ProfileImageProcessor async with proper context managers for memory-efficient image handling

Performance Optimizations

• Concurrent Operations: Implemented asyncio.gather() for parallel status checks in multi-link downloads
• Optimized Locking: Improved lock usage to prevent serialization of concurrent operations
• Lazy Initialization: Added lazy initialization for aria2p API clients to reduce startup overhead
• Memory Optimization:
  • Converted trackers list to immutable tuple
  • Proper cleanup of completed downloads
  • Context managers for image processing

Code Quality Improvements

• Type Hints: Added comprehensive type hints throughout all modules
• Error Handling: Improved exception handling with silent failures where appropriate
• Resource Management: Better cleanup and resource management patterns

Benefits

• Performance: Significantly improved request handling throughput with async architecture
• Resource Usage: Reduced memory footprint and CPU usage through optimizations
• Scalability: Better handling of concurrent requests and downloads
• Maintainability: Improved code quality with type hints and better structure

Testing

• All existing endpoints maintain API compatibility
• Async operations properly handle concurrent requests
• Memory usage optimized for long-running operations

Dependencies

• Updated requirements.txt:
  • Replaced flask with quart
  • Added uvloop (Linux/Mac only, conditional import)

Files Changed

• python_rpc/http_downloader.py - Full async conversion
• python_rpc/http_multi_link_downloader.py - Async with concurrent status checks
• python_rpc/torrent_downloader.py - Async operations with optimized trackers
• python_rpc/profile_image_processor.py - Async image processing
• python_rpc/main.py - Complete rewrite using Quart with uvloop
• requirements.txt - Updated dependencies

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[thegrannychaseroperation]

@kleeedolinux apologies for the huge delay on this, but could you please fix the conflicts? I'll be testing it ASAP, this looks great. Thank you.