Can't work out how to get a geckodriver trace in Python

[djowett]

In order to help us efficiently investigate your issue, please provide the following information:

Platform and application details

• Platform: Ubuntu 16.04
• Firefox: 54.0
• Selenium: 3.4.3

Steps to reproduce

This works prefectly until I try to add a firefox_options parameter as below:

import os.path

from django.contrib.staticfiles.testing import StaticLiveServerTestCase
from easyprocess import EasyProcessCheckInstalledError
from pyvirtualdisplay import Display
from selenium import webdriver
from selenium.common.exceptions import WebDriverException
from selenium.webdriver.firefox.options import Log, Options


class SeleniumTestCase(StaticLiveServerTestCase):

	def setUp(self):
		# setUp is where you instantiate the selenium webdriver and load the browser.
		try:
			self.display = Display(visible=0, size=self.virtualscreensize)
			self.display.start()
		except EasyProcessCheckInstalledError:
			print "xfvb not installed ... continuing assuming physical display available"
			self.display = None

		log_file = os.path.expanduser('~/geckodriver.log')
                    
		options = Options()
		log = Log()
		log.level = 'trace'
		options.set_preference("log", log)

		self.selenium = webdriver.Firefox(log_path=log_file, firefox_options=options)

• A trace level log:
  This is what I can't produce!

[andreastt]

You’re setting the log level as preference, not a capability. In any case, please raise this issue with the maintainers of the Selenium Python client.

[whimboo]

Capabilities in the Python binding are getting set via:

        capabilities = DesiredCapabilities.FIREFOX.copy()
        capabilities["moz:firefoxOptions"] = {
            "log": {
                "level": "trace",
            },
        }
        self.driver = webdriver.Firefox(capabilities=capabilities)

[djowett]

Thanks @whimboo, that's very helpful. I found that the below also worked, but went with your suggestion in the end (the to_capabilities() method doesn't add much it seems)

        capabilities = DesiredCapabilities.FIREFOX.copy()
        log = Log()
        log.level = 'trace'
        capabilities['moz:firefoxOptions'] = log.to_capabilities()

        self.selenium = webdriver.Firefox(log_path=self.log_file, capabilities=capabilities)

[davehunt]

FWIW another approach is to use the Options class, which can be passed independently from capabilties. You shouldn't need to hard-code the moz:firefoxOptions key:

from selenium.webdriver import Firefox
from selenium.webdriver.firefox.options import Options

options = Options()
options.log.level = 'trace'
selenium = Firefox(firefox_options=options)

[lock]

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