Getting console.log output from Chrome with Selenium Python API bindings
Solution 1
Ok, finally figured it out:
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
# enable browser logging
d = DesiredCapabilities.CHROME
d['loggingPrefs'] = { 'browser':'ALL' }
driver = webdriver.Chrome(desired_capabilities=d)
# load the desired webpage
driver.get('http://foo.com')
# print messages
for 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' }
Solution 2
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
Solution 3
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 logging
from selenium import webdriver
def 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_logs
def 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")
Solution 4
Note that calling driver.get_log('browser')
will cause the next call to return nothing until more logs are written to the console.
I would suggest saving the logs to a variable first. For example below logs_2
will equal []
.
If you need something in the console to test you can use:
self.driver.execute_script("""
function myFunction() {
console.log("Window loaded")
}
if(window.attachEvent) {
window.attachEvent('onload', myFunction());
} else {
if(window.onload) {
var curronload = window.onload;
var newonload = function(evt) {
curronload(evt);
myFunction(evt);
};
window.onload = newonload;
} else {
window.onload = myFunction();
}
}
""")
logs_1 = driver.get_log('browser')
print("A::", logs_1 )
logs_2 = driver.get_log('browser')
print("B::", logs_2 )
for entry in logs_1:
print("Aa::",entry)
for entry in logs_2:
print("Bb::",entry)
See the answer from msridhar for what should go above my example code.
msridhar
Updated on August 28, 2020Comments
-
msridhar almost 4 years
I'm using Selenium to run tests in Chrome via the Python API bindings, and I'm having trouble figuring out how to configure Chrome to make the
console.log
output from the loaded test available. I see that there areget_log()
andlog_types()
methods on the WebDriver object, and I've seen Get chrome's console log which shows how to do things in Java. But I don't see an equivalent of Java'sLoggingPreferences
type in the Python API. Is there some way to accomplish what I need? -
kiminoa over 9 yearsHm. Investigating how to do this with chrome_options after trying this out and getting:
/usr/lib/python2.6/site-packages/selenium/webdriver/chrome/webdriver.py:54: DeprecationWarning: Desired Capabilities has been deprecated, please user chrome_options. warnings.warn("Desired Capabilities has been deprecated, please user chrome_options.", DeprecationWarning)
-
kiminoa over 9 yearsI use
webdriver.Remote
with a capability ofbrowserName="chrome"
to instantiate my driver, and it keeps telling meAttributeError: 'WebDriver' object has no attribute 'get_log'
. When I go to the source, I'm struggling to find theget_log
implementation used in this lovely answer. I suspect I've gone horribly astray... somewhere. Wish I knew where! selenium.googlecode.com/svn/trunk/docs/api/py/… -
Equidamoid over 9 years@kiminoa I had this issue with selenium
2.33.0
, upgrade to2.45.0
fixed it. -
binithb over 8 yearsIs there something similar for IE ? I already checked code.google.com/p/selenium/wiki/DesiredCapabilities. Looks like there isn't
-
msridhar over 8 years@binithb no idea; you probably want to ask a separate top-level question
-
Shane over 8 yearsLooks like I can comment out
d['loggingPrefs'] = { 'browser':'ALL' }
and get same results. Also, any way for console logs to not just be'level':'SEVERE'
? -
msridhar about 5 yearsThanks! Want to edit the main answer with an additional sentence including this clarification?
-
uestcfei over 4 years@Shane you need to wait a few seconds with
time.sleep(5)
or your browser will quit without console.log executed. This is my case. -
Seaver Olson over 2 yearsyou just saved my remaining sanity, thanks man.