OctoPrint plugin that backports the fix of #4392 from OctoPrint 1.8.0+ to earlier versions. See also https://github.com/OctoPrint/OctoPrint/issues/4392. Install via Plugin Manager > Get More using URL https://gist.github.com/foosel/77bb2a37bbac66d7fbb9cc5096fb4035/raw/fix_4392.py

fix_4392.py

import octoprint.plugin

FIXED_VERSION = "1.8.0"

class Fix4392Plugin(octoprint.plugin.StartupPlugin):
    def on_startup(self, *args, **kwargs):
        import octoprint.util.commandline
        from past.builtins import unicode
        import re

        _ANSI_CSI_PATTERN = octoprint.util.commandline._ANSI_CSI_PATTERN
        _ANSI_OSC_PATTERN = octoprint.util.commandline._ANSI_OSC_PATTERN
        _ANSI_PATTERN = b"|".join([_ANSI_CSI_PATTERN, _ANSI_OSC_PATTERN])

        _ANSI_REGEX = {
            "bytes": re.compile(_ANSI_PATTERN),
            "unicode": re.compile(_ANSI_PATTERN.decode("utf-8")),
        }
        
        def fixed_clean_ansi(line):
            if isinstance(line, unicode):
                return _ANSI_REGEX["unicode"].sub("", line)
            return _ANSI_REGEX["bytes"].sub(b"", line)
        
        self._logger.info("Monkey-patching octoprint.util.commandline.clean_ansi to fix unicode bug...")
        octoprint.util.commandline.clean_ansi = fixed_clean_ansi


__plugin_name__ = "Backported fix for #4392"
__plugin_version__ = "1.0.0"
__plugin_description__ = "Fixes the UnicodeEncodeError bug #4392 by monkey-patching the affected function"
__plugin_url__ = "https://github.com/OctoPrint/OctoPrint/issues/4392"
__plugin_pythoncompat__ = ">=2.7,<4"
__plugin_implementation__ = Fix4392Plugin()
def __plugin_check__():
    from octoprint.util.version import is_octoprint_compatible
    import logging
    compatible = is_octoprint_compatible("<{}".format(FIXED_VERSION))
    if not compatible:
        logging.getLogger(__name__).info("Plugin is not needed in OctoPrint versions >= {}".format(FIXED_VERSION))
    return compatible