Python 异步响应时间

Question

I am trying to learn asyncio and aiohttp. I have the following code to query for a bunch of URLs using asyncio.

import aiohttp
import asyncio

sync def fetch(session, url):
    async with session.get(url) as response:
        return await response.text()

async def main():
    urls = [
            'http://yahoo.com',
            'https://google.com',
            'http://bing.com'
        ]
    tasks = []
    async with aiohttp.ClientSession() as session:
        for url in urls:
            tasks.append(fetch(session, url))
        htmls = await asyncio.gather(*tasks)
        for html in htmls:
            print(html[:100] + "\n")
    
if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

How do I get the response time for each asynchronous query? My first idea was to just use a timer, but I don't know how to use that in this situation. I've tried searching for if anybody has done something similar, but can't find anything.

Answer 1

async def fetch(session, url):
    """[Coroutine to send HTTP request to URLs provided]

    Args:
        session ([aiohttp Client Session object]): [session object]
        url ([string]): [URL to query]

    Returns:
        [list]: [response url, status and time taken]
    """
    tic = time.perf_counter() # Start timer
    try:
        response = await session.request(method='GET', url=url, timeout=10)
        toc = time.perf_counter() # Stop timer
        time_taken  = toc - tic # Calculate time taken to get response
        response.raise_for_status()
        print("URL : ", url)
        print("HTTP Status : ", response.status)
        print(f"Time taken : {time_taken:4f} seconds")
        print()
        return str(response.url), response.status, time_taken
    
    except HTTPError as http_err:
        logging.error(http_err)
    except Exception as err:
        logging.error(err)