获取 chrome 性能和跟踪日志

问题描述

我正在尝试遵循 使用 WebDriver 进行 Web 性能测试 google 测试自动化会议演讲中建议的想法和 ChromeDriver 性能日志"文档页面来获取我想要的跟踪数据提交到 webpagetest 以便稍后进行性能分析.

I'm trying to follow the idea suggested in the Web Performance Testing with WebDriver google test automation conference talk and ChromeDriver "Performance Log" documentation page to get the trace data which I want to submit to webpagetest for performance analysis later.

如何使用 python selenium 绑定 检索性能日志?

How can I retrieve performance logs using python selenium bindings?

我已尝试打印出驱动程序实例中可用的 log_types

I've tried to print out log_types available in the driver instance

from selenium import webdriver

driver = webdriver.Chrome()
driver.get('https://stackoverflow.com')

print driver.log_types

driver.close()

但只有

[u'browser', u'driver']

我没有看到相关的命令行开关.

推荐答案

性能日志默认禁用.

要启用它，请使用 DesiredCapabilities 并配置loggingPrefs:

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

caps = DesiredCapabilities.CHROME
 #as per latest docs
caps['goog:loggingPrefs'] = {'performance': 'ALL'}
driver = webdriver.Chrome(desired_capabilities=caps)

driver.get('https://stackoverflow.com')

for entry in driver.get_log('performance'):
    print(entry)

driver.quit()

这会导致控制台上打印出一堆跟踪日志条目:

This results into a bunch of tracing log entries printed on the console:

{u'timestamp': 1419487459178, u'message': u'{"message":{"method":"Network.responseReceived","params":{"frameId":"2105.1","loaderId":"2105.2","requestId":"2105.1","response":{"connectionId":0,"connectionReused":false,"encodedDataLength":-1,"fromDiskCache":false,"fromServiceWorker":false,"headers":{"Access-Control-Allow-Origin":"*","Content-Type":"text/plain;charset=US-ASCII"},"mimeType":"text/plain","status":200,"statusText":"OK","url":"data:,"},"timestamp":1419487458.92934,"type":"Document"}},"webview":"2C66E956-A48B-456B-8A4E-1022F699AA92"}', u'level': u'INFO'}
{u'timestamp': 1419487459178, u'message': u'{"message":{"method":"Network.loadingFinished","params":{"encodedDataLength":0,"requestId":"2105.1","timestamp":1419487458.92936}},"webview":"2C66E956-A48B-456B-8A4E-1022F699AA92"}', u'level': u'INFO'}
{u'timestamp': 1419487459178, u'message': u'{"message":{"method":"Page.frameNavigated","params":{"frame":{"id":"2105.1","loaderId":"2105.2","mimeType":"text/plain","securityOrigin":"://","url":"data:,"}}},"webview":"2C66E956-A48B-456B-8A4E-1022F699AA92"}', u'level': u'INFO'}
...

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