Logging can data before and after error message changes

Question

I'm looking to develop a program that writes CAN data to an asc file (using the CAN protocol). The file is supposed to contain all data 10 seconds before and 10 seconds after there is a change with the error variable on the bus. To do this, I have created a log that rotates every 10 seconds. If an error is detected, 10 seconds of additional data are written to the file. When this data has been written, the file will be saved and the name of the rotating log file whill change. I'm having a variety of issues implementing my program (and I've been unsure of how to develop a more specific question because of the lack of resources for CAN protocol on the internet). Any help would be appreciated.

import can
import time
 
Bus = Bus
 
time_log = 0
 
time_log_calculator()
    While time_log < 11
        time.sleep(1)
        time_log += 1
    Else
        do_rollover(data.msg)
        time_log = 0
 
trigger_count = 0
 
variable_file_name = ("%s.asc", trigger_count)
 
Logger = can.io.BaseRotatingLogger( namer = variable_file_name, mode = open())
 
    rotation_filename("%i.asc" rollover_count)
 
    time_calculator_first()
 
    def should_rollver(data.msg)
        If data.msg != None
            Return true
 
notifier = Notifier(bus = bus, listeners = [logger])
 
time = 0
 
time_calculator
    time.sleep(1)
    time = +1
    return time
 
For msg in bus
    If error_data_old = None
        error_data_old = data.msg.dm1
    error_data_new = data.msg.dm1
    If error_data_new != error_data_old
# then we know that there has been a change in the variable value
    Time_calculator()
    While time < 10
        printer = can.printer(variable_file_name, write_to_file = true, append = true)
        on_message_received(msg)
    Else
        Trigger_count += 1
    error_data_old = data.msg.dm1