used uvloop BUG

[blackAzrael]

code:

import uvloop
loop = uvloop.new_event_loop()
# loop = asyncio.get_event_loop()
chrome_executable_path = '/usr/lib64/chromium-browser/chromium-browser'
args = [
        "--disable-gpu",
        "--disable-web-security",
        "--disable-xss-auditor",    
        "--no-sandbox",
        "--disable-setuid-sandbox",
        "--allow-running-insecure-content",
        "--disable-webgl",
        "--disable-popup-blocking",
        '--disable-dev-shm-usage',
    ]
async def run(browser,url):
    page = await browser.newPage(ignoreHTTPSErrors=True)
    resp = await page.goto(url)
    print(resp.status)

async def main2():
    async with async_playwright() as p:
        browser_type = p.chromium
        browser = await browser_type.launch(executablePath=chrome_executable_path,args=args)
        task = [run(browser, f'http://www.baidu.com/s?wd={x}') for x in range(10)]
        await asyncio.gather(*task)
        await browser.close()
if __name__ == '__main__':
    loop.run_until_complete(main2())
    

out error:

python3: src/unix/core.c:932: uv__io_stop: Assertion `loop->watchers[w->fd] == w' failed.

uvloop 0.14.0

playwright 0.171.1

python 3.8.3

[yury-s]

You should use the loop returned by asyncio.get_event_loop() as in the commented out line in your snippet. What is the reason you want to replace it with uvloop.new_event_loop() ?

[blackAzrael]

My main program wants to use uvloop as the event loop, asyncio loop can work normally, but the main program of playwright using uvloop will not run, uvloop can work normally when I use pyppeteer

[blackAzrael]

@yury-s
Is this a bug?
Or what should I do if I want to use uvloop?

[kumaraditya303]

Checkout this snippet for uvloop: @blackAzrael

import uvloop
uvloop.install()
chrome_executable_path = '/usr/lib64/chromium-browser/chromium-browser'
args = [
        "--disable-gpu",
        "--disable-web-security",
        "--disable-xss-auditor",    
        "--no-sandbox",
        "--disable-setuid-sandbox",
        "--allow-running-insecure-content",
        "--disable-webgl",
        "--disable-popup-blocking",
        '--disable-dev-shm-usage',
    ]
async def run(browser,url):
    page = await browser.newPage(ignoreHTTPSErrors=True)
    resp = await page.goto(url)
    print(resp.status)

async def main2():
    async with async_playwright() as p:
        browser_type = p.chromium
        browser = await browser_type.launch(executablePath=chrome_executable_path,args=args)
        task = [run(browser, f'http://www.baidu.com/s?wd={x}') for x in range(10)]
        await asyncio.gather(*task)
        await browser.close()
if __name__ == '__main__':

asyncio.run(main2())
    

[blackAzrael]

@kumaraditya303
Same as before

[kumaraditya303]

What is the platform architecture i.e. is it amd64 or arm ? Also what is the os ?

[blackAzrael]

Linux localhost.localdomain 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[kumaraditya303]

It is an upstream issue of uvloop MagicStack/uvloop#317 so not relevant here

[blackAzrael]

thanks !

[yury-s]

I believe the difference with pyppeteer is that we use pipe to communicate with the server, perhaps we can apply the same workaround as in the uvloop bug.

[pavelfeldman]

Closing as per MagicStack/uvloop#317 reference.