异步函数添加装饰器

对一个爬虫的异步函数，在其功能函数上添加装饰器，用于打印错误日志

import aiohttp
import asyncio

import run_change	# 这是一个防止 asyncio.run()有时会报错 RuntimeError:Event loop is closed 的模块，需要手动编写，下面一个代码块有提供


def wrapper1(func):
    async def wrapper(*args, err, **kwargs):
        result = await asyncio.create_task(func(*args, **kwargs))	# 执行传入的函数
        # print(result)
        if not result:
            print(err)
        return result

    return wrapper


@wrapper1
async def get_message(session):
    # print('开始访问')
    async with session.get('https://www.baidu.com') as response:
        # print('访问结束')
        return await response.text()


async def run():
    async with aiohttp.ClientSession() as session:
        return await asyncio.create_task(get_message(session, err='not'))	# 将功能函数加入任务列表


if __name__ == '__main__':
    s = asyncio.run(run())

# run_change.py

"""
【解决 asyncio.run()有时会报错 RuntimeError:Event loop is closed 情况】

当asyncio.run()被修改为:
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
    确实不会报错

大佬总结, 总而言之是asyncio.run()会自动关闭循环,并且调用_ProactorBasePipeTransport.__del__报错, 而asyncio.run_until_complete()不会.

大佬提供了解决方案, 就是重写方法以保证run()的运行.

【导入此包即可解决问题，如若还不能请使用上面的方式】
"""
from functools import wraps
from asyncio.proactor_events import _ProactorBasePipeTransport


def silence_event_loop_closed(func):
    @wraps(func)
    def wrapper(self, *args, **kwargs):
        try:
            return func(self, *args, **kwargs)
        except RuntimeError as e:
            if str(e) != 'Event loop is closed':
                raise

    return wrapper


_ProactorBasePipeTransport.__del__ = silence_event_loop_closed(_ProactorBasePipeTransport.__del__)