firefox selenium测试完成时出现“无此类文件或目录”错误消息

Question

在使用geckodriver（firefox）运行PythonSelenium测试后，会出现一条标准输出错误消息，但在使用chrome时不会出现。我不知道错误线是从哪里来的。它发生在调用sys之后。exit（），所以在清理过程中的某个地方。

[Errno 2] No such file or directory: '/var/folders/ml/tbnznl592397p4h1svx4t5xr0000gr/T/tmpr8ypd0y1'

• MacOS 10.14.5（莫哈韦）
• 驱动程序信息：firefox=67.0
• 会话信息：firefox=0.24.0
• 硒3.141.0
• Python 3.7.3

下面是火狐和chrome的驱动程序初始化。

    def createDriver(self, browser: str, headless: bool = False, performancelog=False, 
                     consolelog=False, verbose: bool = False):

        ## DRIVERS
        #chrome
        # https://chromedriver.storage.googleapis.com/index.html

        #firefox
        # https://github.com/mozilla/geckodriver/releases
        # 20.1 has a bug where headless doesn't work
        # 19 has a bug where it closes a frame?

        # safari

        # edge
        # https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/
        logger.trace("createDriver()")
        if browser.upper() == 'FIREFOX':
            ## setting log_path to /dev/null will prevent geckodriver from creating it's own log file.
            ## if we enable root logging, we can capture the logging from geckodriver, ourselves.
            options = webdriver.FirefoxOptions()
            profile = webdriver.FirefoxProfile()

            profile.set_preference('app.update.auto', False)
            profile.set_preference('app.update.enabled', False)

            # options.binary_location = binary ## use this only if we want to move the executable outside the available path
            if headless:
                options.headless = True

            caps = DesiredCapabilities.FIREFOX
            caps['unhandledPromptBehavior'] = "ignore"
            driver = webdriver.Firefox(profile, log_path='/dev/null', firefox_options=options, 
                                       desired_capabilities=caps
                                       )
            logger.debug(f"Driver info: firefox={driver.capabilities['browserVersion']}")
            logger.debug(f"Session info: firefox={driver.capabilities['moz:geckodriverVersion']}")

            if driver.capabilities['moz:geckodriverVersion'] == '0.20.1':
                if headless:
                    raise Exception("Headless mode doesn't work in Gecko Driver 0.20.1")

        elif browser.upper() == 'CHROME':
            options = webdriver.ChromeOptions()
            options.add_argument("--disable-extensions")
            options.add_argument("--allow-running-insecure-content")
            options.add_argument("--ignore-certificate-errors")
            options.add_argument("--disable-single-click-autofill")
            options.add_argument("--disable-autofill-keyboard-accessory-view[8]")
            options.add_argument("--disable-full-form-autofill-ios")
            options.add_argument("--dns-prefetch-disable") # https://bugs.chromium.org/p/chromedriver/issues/detail?id=402#c128

            ## ChromeDriver is just AWFUL because every version or two it breaks unless you pass cryptic arguments
            options.add_argument("start-maximized") # https://stackoverflow.com/a/26283818/1689770
            options.add_argument("enable-automation") # https://stackoverflow.com/a/43840128/1689770
            options.add_argument("--no-sandbox") # https://stackoverflow.com/a/50725918/1689770
            options.add_argument("--disable-infobars") # https://stackoverflow.com/a/43840128/1689770
            options.add_argument("--disable-dev-shm-usage") # https://stackoverflow.com/a/50725918/1689770
            options.add_argument("--disable-browser-side-navigation") # https://stackoverflow.com/a/49123152/1689770
            options.add_argument("--disable-gpu") # https://stackoverflow.com/questions/51959986/how-to-solve-selenium-chromedriver-timed-out-receiving-message-from-renderer-exc
            # options.add_argument("--window-size=1280,960")
            options.add_argument("--enable-features=NetworkService,NetworkServiceInProcess") # https://groups.google.com/forum/m/#!topic/chromedriver-users/ktp-s_0M5NM[21-40]

            if headless:
                options.headless = True
                # options.add_argument('--disable-gpu')

            args = [
                "--verbose"
                ]

            caps = DesiredCapabilities.CHROME
            caps['loggingPrefs'] = {
                'browser': 'OFF',
                'performance' : 'OFF',
                'driver' : 'OFF'
                }
            # https://www.skptricks.com/2018/08/timed-out-receiving-message-from-renderer-selenium.html
            # caps['pageLoadStrategy'] = 'none'
            # caps['pageLoadStrategy'] = 'normal'

            if consolelog:
                caps['loggingPrefs']['browser'] = 'ALL'

            ## by default performance is disabled.
            if performancelog:
                caps['loggingPrefs']['performance'] = 'ALL'
                caps['perfLoggingPrefs'] = {
                    'enableNetwork' : True,
                    'enablePage' : False,
                    'enableTimeline' : False
                    }

            if verbose:
                driver = webdriver.Chrome(options=options, service_log_path='chromedriver.log', service_args=args, 
                                          desired_capabilities=caps
                                          )
            else:
                driver = webdriver.Chrome(options=options, 
                                          # service_log_path='chromedriver.log',
                                          desired_capabilities=caps
                                          )
            logger.debug(f"Driver info: chrome={driver.capabilities['chrome']['chromedriverVersion']}")
            logger.debug(f"Session info: chromedriver={driver.capabilities['version']}")

        elif browser.upper() == 'EDGE':
            # driver = webdriver.Edge()
            raise NotImplemented("Edge not supported yet")

        elif browser.upper() == 'SAFARI':
            # driver = webdriver.Safari()
            raise NotImplemented("Safari not supported yet")

        # support is depricated for this -- should use chrome or firefox headless. 
        elif browser.upper() == 'PHANTOMJS':
            # driver = webdriver.PhantomJS()
            raise NotImplemented("PhantomJS not supported yet")
        else:
            raise ValueError(f"Unknown browser: {browser}")

        # driver.set_page_load_timeout(self.timeout)
        # driver.set_script_timeout(self.timeout)
        return driver

在这两种情况下，我都会让驱动程序坐在一个包装器中，处理自动退出驱动程序的问题。

    ############################################################################
    def close(self):
        if self.driver is not None:
            self.driver.close()

    ############################################################################
    def quit(self):
        if self.driver is not None:
            self.driver.quit()

    ############################################################################
    def __del__(self):
        self.quit()

在退出脚本之前调用close或quit不会触发让我感到困惑的错误消息。我原以为错误消息是垃圾收集时geckodriver中的某个东西，但如果是这样的话，我想我可以通过在sys之前关闭驱动程序来手动触发错误。退出（）。

有人知道火狐硒运行后这个错误信息来自哪里吗？

编辑：出现问题的文件夹似乎是FirefoxProfile创建的临时目录。我觉得firefox。网络驱动程序。quit（）方法是日志行的来源。

    def quit(self):
        """Quits the driver and close every associated window."""
        try:
            RemoteWebDriver.quit(self)
        except Exception:
            # We don't care about the message because something probably has gone wrong
            pass

        if self.w3c:
            self.service.stop()
        else:
            self.binary.kill()

        if self.profile is not None:
            try:
                shutil.rmtree(self.profile.path)
                if self.profile.tempfolder is not None:
                    shutil.rmtree(self.profile.tempfolder)
            except Exception as e:
                print(str(e)) #<-- this is the line where the error occurs.

Answer 1

嘎！我完全忘记了我在Firefox的web驱动程序中添加了一个__del__方法。（

# hack to force firefox to quit when closing scope
def __del_replacement__(self: webdriver.Firefox):
    print("__del__ called in Firefox")
    self.quit()
webdriver.Firefox.__del__ = __del_replacement__

问题是还有一个__del__方法在包装中围绕着web驱动程序，它试图调用driver.quit（）。这个问题是由两个调用试图删除临时目录的方法引起的。第二个失败了，因为它已经被移除了。