"""Portable single-worker entry point: python -m src.serve --port 8000."""
import argparse
import asyncio
import os

import uvicorn


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--host', default='127.0.0.1')
    parser.add_argument('--port', default=8000, type=int)
    args = parser.parse_args()
    # psycopg 不支持 Windows ProactorEventLoop。直接运行 Server.serve
    # 使用已创建的 Selector loop，不被 uvicorn 默认 loop factory 覆盖。
    factory = asyncio.SelectorEventLoop if os.name == 'nt' else None
    config = uvicorn.Config('src.main:app', host=args.host, port=args.port, loop='asyncio')
    with asyncio.Runner(loop_factory=factory) as runner:
        runner.run(uvicorn.Server(config).serve())


if __name__ == '__main__':
    main()