azure_functions_worker/utils/common.py [49:89]:
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def get_app_setting(
    setting: str,
    default_value: Optional[str] = None,
    validator: Optional[Callable[[str], bool]] = None
) -> Optional[str]:
    """Returns the application setting from environment variable.

    Parameters
    ----------
    setting: str
        The name of the application setting (e.g. FUNCTIONS_RUNTIME_VERSION)

    default_value: Optional[str]
        The expected return value when the application setting is not found,
        or the app setting does not pass the validator.

    validator: Optional[Callable[[str], bool]]
        A function accepts the app setting value and should return True when
        the app setting value is acceptable.

    Returns
    -------
    Optional[str]
        A string value that is set in the application setting
    """
    app_setting_value = os.getenv(setting)

    # If an app setting is not configured, we return the default value
    if app_setting_value is None:
        return default_value

    # If there's no validator, we should return the app setting value directly
    if validator is None:
        return app_setting_value

    # If the app setting is set with a validator,
    # On True, should return the app setting value
    # On False, should return the default value
    if validator(app_setting_value):
        return app_setting_value
    return default_value
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proxy_worker/utils/common.py [13:53]:
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def get_app_setting(
        setting: str,
        default_value: Optional[str] = None,
        validator: Optional[Callable[[str], bool]] = None
) -> Optional[str]:
    """Returns the application setting from environment variable.

    Parameters
    ----------
    setting: str
        The name of the application setting (e.g. FUNCTIONS_RUNTIME_VERSION)

    default_value: Optional[str]
        The expected return value when the application setting is not found,
        or the app setting does not pass the validator.

    validator: Optional[Callable[[str], bool]]
        A function accepts the app setting value and should return True when
        the app setting value is acceptable.

    Returns
    -------
    Optional[str]
        A string value that is set in the application setting
    """
    app_setting_value = os.getenv(setting)

    # If an app setting is not configured, we return the default value
    if app_setting_value is None:
        return default_value

    # If there's no validator, we should return the app setting value directly
    if validator is None:
        return app_setting_value

    # If the app setting is set with a validator,
    # On True, should return the app setting value
    # On False, should return the default value
    if validator(app_setting_value):
        return app_setting_value
    return default_value
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