谈谈Selenium中浏览器驱动的日志

谈谈Selenium中浏览器驱动的日志

• 来源于一位TX，“老师为啥firefox执行后会有日志文件，chrome没有呢？”

比对

• 你打开chrome浏览器from selenium import webdriverdriver = webdriver.Chrome()
• 这样是没有日志的
• 同样的代码，你打开firefoxfrom selenium import webdriverdriver = webdriver.Firefox()
• 就会有个日志文件geckodriver.log生成，默认在你上面代码所在目录
• 内容大致如下1678943199197 geckodriver INFO Listening on 127.0.0.1:86951678943202290 mozrunner::runner INFO Running command:"C:\\Program Files\\Mozilla Firefox\\firefox.exe""--marionette""--remote-debugging-port""8696""-no-remote""-profile""C:\\Users\\SONGQI~1\\AppData\\Local\\Temp\\rust_mozprofileNtWGR9"1678943202558 Marionette INFO Marionette enabledDynamically enable window occlusion 01678943202562 Marionette INFO Listening on port 8705WebDriver BiDi listening on ws://127.0.0.1:86961678943202947 RemoteAgent WARN TLS certificate errors will be ignored for this sessionconsole.warn: SearchSettings:"get: No settings file exists, new profile?"(new NotFoundError("Could not open the file at C:\\Users\\SONGQI~1\\AppData\\Local\\Temp\\rust_mozprofileNtWGR9\\search.json.mozlz4",(void 0)))DevTools listening on ws://127.0.0.1:8696/devtools/browser/791df03a-8db6-429b-969a-32cd077b3c2f
• 的确是这样的，chrome和firefox2个浏览器在selenium中的api都是有差异的
• 下面的代码可以让你看到2者独有的那些apifrom selenium import webdriverdriver1 = webdriver.Chrome()driver2 = webdriver.Firefox()set_of_chrome_api =set([_ for _ indir(driver1)if _[0]!='_'])set_of_firefox_api =set([_ for _ indir(driver2)if _[0]!='_'])print('firefox特有的:',(set_of_chrome_api|set_of_firefox_api)-set_of_chrome_api)print('-------------')print('chrome特有的:',(set_of_chrome_api|set_of_firefox_api)-set_of_firefox_api)

让chrome也有日志

• 首先来看下Chrome这个类的初始化参数都有哪些# selenium\webdriver\chrome\webdriver.pyclassWebDriver(ChromiumDriver):def__init__(self, executable_path=DEFAULT_EXECUTABLE_PATH, port=DEFAULT_PORT, options: Options =None, service_args=None, desired_capabilities=None, service_log_path=DEFAULT_SERVICE_LOG_PATH, chrome_options=None, service: Service =None, keep_alive=DEFAULT_KEEP_ALIVE):
• 你应该一眼就看到有日志相关的参数了service_log_path
• 有个默认值DEFAULT_SERVICE_LOG_PATH
• 往上能看到定义：DEFAULT_SERVICE_LOG_PATH = None
• 所以chrome就没有日志了
• 要有就简单了，给一个值就行了，这样from selenium import webdriverdriver = webdriver.Chrome(service_log_path='chrome.log')
• 妥妥的在当前目录下生成了一个chrome.log文件里面也记录着本次操作的日志
• 多说几句，默认的日志就记录到INFO/WARN这样的级别
• 如果要加DEBUG的信息，可以这样from selenium import webdriverdriver = webdriver.Chrome(service_args=['--verbose'], service_log_path='chrome.log')

让firefox没有日志，没那么简单

• 循着刚才的思路，让firefox没有日志似乎就很简单了
• 依葫芦画瓢，找到Firefox的定义# selenium\webdriver\firefox\webdriver.py# 注意，此处的路径跟上面的chrome的并不一样classWebDriver(RemoteWebDriver):def__init__(self, firefox_profile=None, firefox_binary=None, capabilities=None, proxy=None, executable_path=DEFAULT_EXECUTABLE_PATH, options=None, service_log_path=DEFAULT_SERVICE_LOG_PATH, service_args=None, service=None, desired_capabilities=None, log_path=DEFAULT_LOG_PATH, keep_alive=True):
• 看到了参数service_log_path，一样也有默认值DEFAULT_SERVICE_LOG_PATH
• 找到定义处，DEFAULT_SERVICE_LOG_PATH = “geckodriver.log”
• 改为None试试from selenium import webdriverdriver = webdriver.Firefox(service_log_path=None)
• 效果有，但又有点不对
• 控制台冒出了很多信息demo_log.py:2: DeprecationWarning: service_log_path has been deprecated, please passin a Service object driver = webdriver.Firefox(service_log_path=None)1678944678241 geckodriver INFO Listening on 127.0.0.1:107291678944681310 mozrunner::runner INFO Running command:"C:\\Program Files\\Mozilla Firefox\\firefox.exe""--marionette""--remote-debugging-port""10730""-no-remote""-profile""C:\\Users\\SONGQI~1\\AppData\\Local\\Temp\\rust_mozprofileeEN3y9"Dynamically enable window occlusion 01678944681583 Marionette INFO Marionette enabled1678944681587 Marionette INFO Listening on port 10743WebDriver BiDi listening on ws://127.0.0.1:107301678944681883 RemoteAgent WARN TLS certificate errors will be ignored for this sessionconsole.warn: SearchSettings:"get: No settings file exists, new profile?"(new NotFoundError("Could not open the file at C:\\Users\\SONGQI~1\\AppData\\Local\\Temp\\rust_mozprofileeEN3y9\\search.json.mozlz4",(void 0)))DevTools listening on ws://127.0.0.1:10730/devtools/browser/a4f3a501-e642-4540-8998-ae1ea0b3abc5
• 仔细一看，跟之前在geckodriver.log中打印的类似
• 还多了一句DeprecationWarning: service_log_path has been deprecated, please pass in a Service object
• 原来service_log_path被弃用了，需要传递一个Service对象
• 怎么传递Service对象呢？找到其定义，注意路径
• 有多个Service在selenium这个库中，你要的是firefox下的# selenium\webdriver\firefox\service.pyclassService(service.Service):"""Object that manages the starting and stopping of the GeckoDriver."""def__init__(self, executable_path:str= DEFAULT_EXECUTABLE_PATH, port:int=0, service_args: List[str]=None, log_path:str="geckodriver.log", env:dict=None):
• 可以看到，这里有个参数log_path，其默认值是"geckodriver.log"
• 那我们就可以这样修改了from selenium import webdriverfrom selenium.webdriver.firefox.service import Service# 听你的，传递一个Service对象# Service(log_path='') 就是一个driver = webdriver.Firefox(service=Service(log_path=''))
• 至此DeprecationWarning: service_log_path has been deprecated, please pass in a Service object的这段没了
• 不过下面的1678945260755 geckodriver INFO Listening on 127.0.0.1:11634，这样的仍然存在的
• 而这部分实际是geckodriver这个驱动的打印信息C:\Users\xxx>geckodriver1678945567307 geckodriver INFO Listening on 127.0.0.1:4444
• 如果要去掉，就是让geckodriver这个程序静默
• 没有找到太好的办法，geckodriver的帮助如下C:\Users\xxx>geckodriver --helpgeckodriver 0.30.0 (d372710b98a6 2021-09-16 10:29 +0300)WebDriver implementation for FirefoxUSAGE: geckodriver [FLAGS] [OPTIONS]FLAGS: --connect-existing Connect to an existing Firefox instance -h, --help Prints this message --jsdebugger Attach browser toolbox debugger for Firefox -v Log level verbosity (-v for debug and -vv for trace level) -V, --version Prints version and copying informationOPTIONS: --android-storage <ANDROID_STORAGE> Selects storage location to be used for test data (deprecated). [possible values: auto, app, internal, sdcard] -b, --binary <BINARY> Path to the Firefox binary --log <LEVEL> Set Gecko log level [possible values: fatal, error, warn, info, config, debug, trace] --marionette-host <HOST> Host to use to connect to Gecko [default: 127.0.0.1] --marionette-port <PORT> Port to use to connect to Gecko [default: system-allocated port] --host <HOST> Host IP to use for WebDriver server [default: 127.0.0.1] -p, --port <PORT> Port to use for WebDriver server [default: 4444] --websocket-port <PORT> Port to use to connect to WebDriver BiDi [default: 9222]
• –log 这个参数可以让它控制输出级别
• 最终我们可以这样写from selenium import webdriverfrom selenium.webdriver.firefox.service import Servicedriver = webdriver.Firefox(service=Service(log_path='', service_args=['--log','fatal']))# 你不能 ['--log fatal'] 会报错
• 然，即便如此，控制台一样有打印Dynamically enable window occlusion 0WebDriver BiDi listening on ws://127.0.0.1:12166console.warn: SearchSettings: "get: No settings file exists, new profile?"(new NotFoundError("Could not open the file at C:\\Users\\SONGQI~1\\AppData\\Local\\Temp\\rust_mozprofiledrxhm5\\search.json.mozlz4", (void 0)))DevTools listening on ws://127.0.0.1:12166/devtools/browser/22a37523-84bc-4bd6-a5e9-79c30825d1e8
• 啊~~~~~~~~~无语了，不弄了，放弃了，干点有意义的事情吧，有点无趣