异步爬虫提速实践-在Scrapy中使用Aiohttp/Trio

import asyncio
import aiohttp
import trio
 
# 使用aiohttp的异步HTTP客户端
async def fetch(session, url):
    async with session.get(url) as response:
        return await response.text()
 
# 使用Trio的异步IO运行
def run_with_trio(coroutine):
    try:
        trio.run(coroutine)
    except KeyboardInterrupt:
        print("Execution cancelled by user")
 
async def main():
    async with aiohttp.ClientSession() as session:
        urls = ['http://example.com/{}'.format(i) for i in range(10)]
        tasks = [fetch(session, url) for url in urls]
        results = await asyncio.gather(*tasks)
        for result in results:
            print(result)
 
if __name__ == '__main__':
    trio_coroutine = trio.run_in_thread(asyncio.run, main())
    run_with_trio(trio_coroutine)

这段代码展示了如何使用aiohttp和Trio来编写异步的网络请求代码。首先，我们定义了一个异步的fetch函数，它使用aiohttp库来发送HTTP请求并获取响应。然后，我们定义了一个主异步函数main，它使用aiohttp的ClientSession来发送多个请求并收集结果。最后，我们通过Trio来运行这个异步函数，确保在整个过程中有良好的异步处理和异常管理。