Protractor - log type 'performance' not found error - protractor

Question

webdriver-manager 12.1.5
protractor Version 5.4.2
Chrome version 75.0.3770.100
browser.manage().logs().get('performance');
This used to work fine before upgrading my webdriver-manager and protractor version.
(node:27715) UnhandledPromiseRejectionWarning: WebDriverError: invalid argument: log type 'performance' not found
(Session info: chrome=75.0.3770.100)
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info:, os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.14.4', java.version: '1.8.0_191'
Driver info: driver.version: unknown
at Object.checkLegacyResponse (node_modules/selenium-webdriver/lib/error.js:546:15)
If I comment the browser.manage().logs().get('performance'); and other performance related code, then the test runs fine.
webdriver-manager logs show:
Starting ChromeDriver 75.0.3770.90 on port 12268

Answer 1

I came across a potential solution on this github issue thead. Apparently recently chromedriver has started to more strictly adhere to W3C standards and this has affected how webdriver activates logs.
We can get around this issue by setting the w3c: false flag in chromeoptions like so.
capabilities: {
browserName: 'chrome',
loggingPrefs: {
browser: 'ALL',
driver: 'ALL',
performance: 'ALL',
},
'goog:chromeOptions': {
perfLoggingPrefs: {
enableNetwork: true,
},
w3c: false,
},
},

Answer 2

New version might not support performance log type. You can always use getAvailableLogTypes function to check supported log types. I tried following code
var supportedLogTypes = await browser.manage().logs().getAvailableLogTypes();
received ouptput :
It means you can only use either of two supported log types.

Answer 3

I tried out the same thing with chrome 75.* and protractor 5.4.2 version. Following are my findings.
loggingPrefs object is one of the recognized capabilities like chromeOptions. This object allow us to decide preferences on logging part. Refer link for more details about capabilities.
In protractor context we have to pass loggingPrefs object to capabilities to enable it.
Once we pass it then we can use browser.manage().logs().get('performance'); to get all performance logs.
If you want to change perfLoggingPrefs then it is part of chromeOptions object and it has to be updated there. If we want to use default then no need to mention.

Answer 4

chrome use more strictly rule for w3c, when I test chrome driver 96, set w3c to false, I can get network log, but find_element failed and return dict value which is not WebElement