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switch_to.context切换到webview,报错:A new session could not be created

问题描述

从原生页面切换到webview页面,报错A new session could not be created.(详见下方报错堆栈信息)
查找元素、点击操作和打印page_source都是没问题的。

其他信息

系统环境:win10
appium环境:1.16.0
模拟器:Genymotion
chromedriver版本:2.20

capabilities配置

chromedriver文件地址

image

堆栈信息


test_xueqiu.py:115 (TestXueqiu.test_webview_context)
self = <test_appium.test_xueqiu.TestXueqiu object at 0x000001C1DE480BA8>

    def test_webview_context(self):
        self.driver.find_element(By.XPATH, "//*[@text='交易' and contains(@resource-id, 'tab')]").click()
        # self.driver.find_element(MobileBy.ACCESSIBILITY_ID, "A股开户").click()
        for i in range(5):
            print(self.driver.contexts)
            sleep(1)
        print(self.driver.page_source)
>       self.driver.switch_to.context(self.driver.contexts[-1])

test_xueqiu.py:123: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
..\venv\lib\site-packages\appium\webdriver\switch_to.py:30: in context
    self._driver.execute(MobileCommand.SWITCH_TO_CONTEXT, {'name': context_name})
..\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py:321: in execute
    self.error_handler.check_response(response)
..\venv\lib\site-packages\appium\webdriver\errorhandler.py:29: in check_response
    raise wde
..\venv\lib\site-packages\appium\webdriver\errorhandler.py:24: in check_response
    super(MobileErrorHandler, self).check_response(response)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <appium.webdriver.errorhandler.MobileErrorHandler object at 0x000001C1DD692B38>
response = {'status': 500, 'value': '{"value":{"error":"unknown error","message":"An unknown server-side error occurred while pro...\\appium\\\\node_modules\\\\_appium-base-driver@5.2.1@appium-base-driver\\\\lib\\\\protocol\\\\protocol.js:392:37)"}}'}

    def check_response(self, response):
        """
        Checks that a JSON response from the WebDriver does not have an error.
    
        :Args:
         - response - The JSON response from the WebDriver server as a dictionary
           object.
    
        :Raises: If the response contains an error message.
        """
        status = response.get('status', None)
        if status is None or status == ErrorCode.SUCCESS:
            return
        value = None
        message = response.get("message", "")
        screen = response.get("screen", "")
        stacktrace = None
        if isinstance(status, int):
            value_json = response.get('value', None)
            if value_json and isinstance(value_json, basestring):
                import json
                try:
                    value = json.loads(value_json)
                    if len(value.keys()) == 1:
                        value = value['value']
                    status = value.get('error', None)
                    if status is None:
                        status = value["status"]
                        message = value["value"]
                        if not isinstance(message, basestring):
                            value = message
                            message = message.get('message')
                    else:
                        message = value.get('message', None)
                except ValueError:
                    pass
    
        exception_class = ErrorInResponseException
        if status in ErrorCode.NO_SUCH_ELEMENT:
            exception_class = NoSuchElementException
        elif status in ErrorCode.NO_SUCH_FRAME:
            exception_class = NoSuchFrameException
        elif status in ErrorCode.NO_SUCH_WINDOW:
            exception_class = NoSuchWindowException
        elif status in ErrorCode.STALE_ELEMENT_REFERENCE:
            exception_class = StaleElementReferenceException
        elif status in ErrorCode.ELEMENT_NOT_VISIBLE:
            exception_class = ElementNotVisibleException
        elif status in ErrorCode.INVALID_ELEMENT_STATE:
            exception_class = InvalidElementStateException
        elif status in ErrorCode.INVALID_SELECTOR \
                or status in ErrorCode.INVALID_XPATH_SELECTOR \
                or status in ErrorCode.INVALID_XPATH_SELECTOR_RETURN_TYPER:
            exception_class = InvalidSelectorException
        elif status in ErrorCode.ELEMENT_IS_NOT_SELECTABLE:
            exception_class = ElementNotSelectableException
        elif status in ErrorCode.ELEMENT_NOT_INTERACTABLE:
            exception_class = ElementNotInteractableException
        elif status in ErrorCode.INVALID_COOKIE_DOMAIN:
            exception_class = InvalidCookieDomainException
        elif status in ErrorCode.UNABLE_TO_SET_COOKIE:
            exception_class = UnableToSetCookieException
        elif status in ErrorCode.TIMEOUT:
            exception_class = TimeoutException
        elif status in ErrorCode.SCRIPT_TIMEOUT:
            exception_class = TimeoutException
        elif status in ErrorCode.UNKNOWN_ERROR:
            exception_class = WebDriverException
        elif status in ErrorCode.UNEXPECTED_ALERT_OPEN:
            exception_class = UnexpectedAlertPresentException
        elif status in ErrorCode.NO_ALERT_OPEN:
            exception_class = NoAlertPresentException
        elif status in ErrorCode.IME_NOT_AVAILABLE:
            exception_class = ImeNotAvailableException
        elif status in ErrorCode.IME_ENGINE_ACTIVATION_FAILED:
            exception_class = ImeActivationFailedException
        elif status in ErrorCode.MOVE_TARGET_OUT_OF_BOUNDS:
            exception_class = MoveTargetOutOfBoundsException
        elif status in ErrorCode.JAVASCRIPT_ERROR:
            exception_class = JavascriptException
        elif status in ErrorCode.SESSION_NOT_CREATED:
            exception_class = SessionNotCreatedException
        elif status in ErrorCode.INVALID_ARGUMENT:
            exception_class = InvalidArgumentException
        elif status in ErrorCode.NO_SUCH_COOKIE:
            exception_class = NoSuchCookieException
        elif status in ErrorCode.UNABLE_TO_CAPTURE_SCREEN:
            exception_class = ScreenshotException
        elif status in ErrorCode.ELEMENT_CLICK_INTERCEPTED:
            exception_class = ElementClickInterceptedException
        elif status in ErrorCode.INSECURE_CERTIFICATE:
            exception_class = InsecureCertificateException
        elif status in ErrorCode.INVALID_COORDINATES:
            exception_class = InvalidCoordinatesException
        elif status in ErrorCode.INVALID_SESSION_ID:
            exception_class = InvalidSessionIdException
        elif status in ErrorCode.UNKNOWN_METHOD:
            exception_class = UnknownMethodException
        else:
            exception_class = WebDriverException
        if value == '' or value is None:
            value = response['value']
        if isinstance(value, basestring):
            if exception_class == ErrorInResponseException:
                raise exception_class(response, value)
            raise exception_class(value)
        if message == "" and 'message' in value:
            message = value['message']
    
        screen = None
        if 'screen' in value:
            screen = value['screen']
    
        stacktrace = None
        if 'stackTrace' in value and value['stackTrace']:
            stacktrace = []
            try:
                for frame in value['stackTrace']:
                    line = self._value_or_default(frame, 'lineNumber', '')
                    file = self._value_or_default(frame, 'fileName', '<anonymous>')
                    if line:
                        file = "%s:%s" % (file, line)
                    meth = self._value_or_default(frame, 'methodName', '<anonymous>')
                    if 'className' in frame:
                        meth = "%s.%s" % (frame['className'], meth)
                    msg = "    at %s (%s)"
                    msg = msg % (meth, file)
                    stacktrace.append(msg)
            except TypeError:
                pass
        if exception_class == ErrorInResponseException:
            raise exception_class(response, message)
        elif exception_class == UnexpectedAlertPresentException:
            alert_text = None
            if 'data' in value:
                alert_text = value['data'].get('text')
            elif 'alert' in value:
                alert_text = value['alert'].get('text')
            raise exception_class(message, screen, stacktrace, alert_text)
>       raise exception_class(message, screen, stacktrace)
E       selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: A new session could not be created. Details: session not created exception
E       from unknown error: failed to close UI debuggers
E         (Session info: chrome=44.0.2403.119)
E         (Driver info: chromedriver=2.20.353145 (343b531d31eeb933ec778dbcf7081628a1396067),platform=Windows NT 10.0 x86_64)

..\venv\lib\site-packages\selenium\webdriver\remote\errorhandler.py:242: WebDriverException

appium 日志

部分截图

完整日志文件

appium.log (51.5 KB)

谢谢@王栎杰和@天马,重启一下模拟器解决了。。。
ps:
Genymotion模拟器有个小坑,每次重启udid都会变,所以尽量caps不写死。

如果模拟器重启还是不行,就把appium和adb都重启一遍。。
再不行我也没招了…

这个问题有时候出现概率很高,不知道是不是机器超负荷运转了 :joy:

也有可能是chrome存在,关闭chrome

手机上的chrome存在?

看了下手机上没有chrome开启。。这个问题出现概率还是挺大的,今天又出现了。。 :no_mouth:

有没有好的办法呢,不想每次都重启模拟器,费事儿 :mask:

把这几个加速的开关注释掉了,报错暂时不再出现。
临时解决方案先搁着,晚点再研究研究原理。。。

        # caps["noReset"] = True  # 设置以后不会清空数据,再次进入app不会有协议同意的弹框
        # caps["dontStopAppOnReset"] = True  # True则不会重启app
        # caps["skipDeviceInitialization"] = True