Using existing event loop

[mrwillis]

Hi there,

I am trying to use the context manager like so

def join_google_meet():
    logging.info("Starting Google Meet session")
    with SB(uc=True, headless=True, window_size="1920,1080", undetected=True) as sb:
        logging.info("Initialized SeleniumBase")
        sb.activate_cdp_mode()
        logging.info("Activated CDP mode")
        sb.sleep(5)
        sb.save_screenshot_to_logs("screenshot.png")

async def main():
    try:
        # Setup audio before joining the meeting
        await setup_audio()
        join_google_meet()
    except Exception as e:
        logging.error(f"An error occurred: {str(e)}", exc_info=True)
        raise

if __name__ == "__main__":
    asyncio.run(main())

but I'm getting this error, presumably because of competing event loops

2025-05-01 14:55:13,550 - INFO - Initialized SeleniumBase
2025-05-01 14:55:16,275 - ERROR - An error occurred: Cannot run the event loop while another loop is running
Traceback (most recent call last):
  File "/app/index.py", line 140, in main
    join_google_meet()
  File "/app/index.py", line 71, in join_google_meet
    sb.activate_cdp_mode()
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/fixtures/base_case.py", line 4882, in activate_cdp_mode
    self.driver.uc_open_with_cdp_mode(url, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/core/browser_launcher.py", line 5431, in <lambda>
    lambda *args, **kwargs: uc_open_with_cdp_mode(
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/core/browser_launcher.py", line 561, in uc_open_with_cdp_mode
    driver.cdp_base = loop.run_until_complete(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 625, in run_until_complete
    self._check_running()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 586, in _check_running
    raise RuntimeError(
RuntimeError: Cannot run the event loop while another loop is running
Traceback (most recent call last):
  File "/app/index.py", line 146, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
    return future.result()
  File "/app/index.py", line 140, in main
    join_google_meet()
  File "/app/index.py", line 71, in join_google_meet
    sb.activate_cdp_mode()
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/fixtures/base_case.py", line 4882, in activate_cdp_mode
    self.driver.uc_open_with_cdp_mode(url, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/core/browser_launcher.py", line 5431, in <lambda>
    lambda *args, **kwargs: uc_open_with_cdp_mode(
  File "/usr/local/lib/python3.10/dist-packages/seleniumbase/core/browser_launcher.py", line 561, in uc_open_with_cdp_mode
    driver.cdp_base = loop.run_until_complete(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 625, in run_until_complete
    self._check_running()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 586, in _check_running
    raise RuntimeError(
RuntimeError: Cannot run the event loop while another loop is running
sys:1: RuntimeWarning: coroutine 'start' was never awaited

Is there a way to give SeleniumBase an event loop that I can manage so I can do other async stuff? I've tried using

https://github.com/seleniumbase/SeleniumBase/blob/master/examples/cdp_mode/raw_async.py

but can't figure out how to enable UC mode.

[mdmintz]

Duplicate of #3464 (comment)

---

If you're looking to use async/await with SeleniumBase CDP Mode, there's an async format. Eg:

import asyncio
import time
from seleniumbase.undetected import cdp_driver

async def main():
    driver = await cdp_driver.cdp_util.start_async()
    page = await driver.get("about:blank")
    await page.set_locale("en")
    await page.get("https://www.priceline.com/")
    time.sleep(3)
    print(await page.evaluate("document.title"))
    element = await page.select('[data-testid*="endLocation"]')
    await element.click_async()
    time.sleep(1)
    await element.send_keys_async("Boston")
    time.sleep(2)

if __name__ == "__main__":
    loop = asyncio.new_event_loop()
    loop.run_until_complete(main())

Otherwise, if you want nested event loops, see https://stackoverflow.com/a/61847103/7058266, which tells you to use nest_asyncio: (pip install nest-asyncio):

import nest_asyncio
nest_asyncio.apply()

[mrwillis]

@mdmintz Okay great that seems to works, thanks. The issue I'm having now is that it seems the options are slightly different? I am trying to join a google meet call and with this code

 with SB(uc=True, headless=True) as sb:
        logging.info("Initialized SeleniumBase")
        sb.activate_cdp_mode()
        logging.info("Activated CDP mode")
        
        logging.info("Opening Google Meet URL")
        sb.open(url)

and it works fine. No detection. But with this code

    logging.info("Starting Google Meet session")
    driver = await cdp_driver.cdp_util.start_async(headless=True)
    try:
        logging.info("Initialized CDP driver")
        page = await page.get(url)
        logging.info("Opened Google Meet URL")
        
        time.sleep(5)
        logging.info("Saving screenshot")

I am getting this. Am I missing some options? I would presume the behaviour is exactly the same.

[mdmintz]

Headless Mode is detectable, so I wouldn't expect it to work at all.
If you need to run on Linux, use Xvfb, which is included with UC Mode.