Getting console.log output from Chrome with Selenium Python API bindings

Ok, finally figured it out:

from selenium import webdriverfrom selenium.webdriver.common.desired_capabilities import DesiredCapabilities# enable browser loggingd = DesiredCapabilities.CHROMEd['loggingPrefs'] = { 'browser':'ALL' }driver = webdriver.Chrome(desired_capabilities=d)# load the desired webpagedriver.get('http://foo.com')# print messagesfor entry in driver.get_log('browser'):    print(entry)

Entries whose source field equals 'console-api' correspond to console messages, and the message itself is stored in the message field.

Starting from chromedriver, 75.0.3770.8, you have to use goog:loggingPrefs instead of loggingPrefs:

d['goog:loggingPrefs'] = { 'browser':'ALL' }

To complete the answer: starting from chromedriver 75.0.3770.8, you have to use goog:loggingPrefs instead of loggingPrefs.

See Chromedriver changelog: http://chromedriver.chromium.org/downloads or this bug: https://bugs.chromium.org/p/chromedriver/issues/detail?id=2976

if you are using the python logging module (and you should be)... here is a way to add the selenium browser logs to the python logging system..

the get_browser_log_entries() function grabs the logs from eth provded driver, emits them to the python logging module as chrome. (ie chrome.console-api, chrome.network etc..) using the timestamp from the browser.(in case there is a delay before you call get_log)

it could probably do with some better exception handling (like if logging is not turned on ) etc.. but it works most of the time..

hop

import loggingfrom selenium import webdriverdef get_browser_log_entries(driver):    """get log entreies from selenium and add to python logger before returning"""    loglevels = { 'NOTSET':0 , 'DEBUG':10 ,'INFO': 20 , 'WARNING':30, 'ERROR':40, 'SEVERE':40, 'CRITICAL':50}    #initialise a logger    browserlog = logging.getLogger("chrome")    #get browser logs    slurped_logs = driver.get_log('browser')    for entry in slurped_logs:        #convert broswer log to python log format        rec = browserlog.makeRecord("%s.%s"%(browserlog.name,entry['source']),loglevels.get(entry['level']),'.',0,entry['message'],None,None)        rec.created = entry['timestamp'] /1000 # log using original timestamp.. us -> ms        try:            #add browser log to python log            browserlog.handle(rec)        except:            print(entry)    #and return logs incase you want them    return slurped_logsdef demo():    caps = webdriver.DesiredCapabilities.CHROME.copy()    caps['goog:loggingPrefs'] = { 'browser':'ALL' }    driver = webdriver.Chrome(desired_capabilities=caps )    driver.get("http://localhost")    consolemsgs = get_browser_log_entries(driver)if __name__ == "__main__":    logging.basicConfig(level=logging.DEBUG, format='%(asctime)s:%(levelname)7s:%(message)s')    logging.info("start")    demo()    logging.info("end")