Adjust Odoo Error Codes with monkey patching

import logging
import werkzeug

import odoo
from odoo.http import AuthenticationError, JsonRequest, serialize_exception, SessionExpiredException

_logger = logging.getLogger(__name__)


def _handle_exception(self, exception):
    """Called within an except block to allow converting exceptions
       to arbitrary responses. Anything returned (except None) will
       be used as response."""
    try:
        return super(JsonRequest, self)._handle_exception(exception)
    except Exception:
        if not isinstance(exception, SessionExpiredException):
            if exception.args and exception.args[0] == "bus.Bus not available in test mode":
                _logger.info(exception)
            elif isinstance(exception, (odoo.exceptions.UserError,
                                        werkzeug.exceptions.NotFound)):
                _logger.warning(exception)
            else:
                _logger.exception("Exception during JSON request handling.")
        error = {
            'code': 400,
            'message': "Odoo Server Error",
            'data': serialize_exception(exception),
        }
        if isinstance(exception, werkzeug.exceptions.NotFound):
            error['http_status'] = 404
            error['code'] = 404
            error['message'] = "404: Not Found"
        if isinstance(exception, AuthenticationError):
            error['code'] = 100
            error['message'] = "Odoo Session Invalid"
        if isinstance(exception, SessionExpiredException):
            error['code'] = 100
            error['message'] = "Odoo Session Expired"
        if isinstance(exception, werkzeug.exceptions.UnprocessableEntity):
            error['code'] = 422
            error['message'] = "422 Unprocessable Entity"
        return self._json_response(error=error)


JsonRequest._handle_exception = _handle_exception