advanced-python-homework-2023/noblocking_turtle_shell.py

import cmd
import threading
from threading import Thread
from threading import Event
import argparse
import time

from queue import Queue

from equipment.turtle_device import TurtleDevice


class TurtleDeviceThread(threading.Thread):

    # TODO(Homework 4) \begin
    def __message_processing__(self):
        while True:
            new_message = self.queue.get()
            #print(type(new_message))
            #print(new_message)
            #print("Name and args of action are {}".format(new_message))
            self.device.execute(*new_message)
            #time.sleep(30)
            self.queue.task_done()
            if self.event.is_set():
                break
    def __message_thread__(self):
        thread = Thread(target = self.__message_processing__, daemon=True)
        thread.start()
    # TODO(Homework 4) \end

    def __init__(self):
        super().__init__()
        self.device = TurtleDevice()
        self.queue = Queue()
        self.event = Event()


class NoBlockingTurtleShell(cmd.Cmd):
    intro = 'Welcome to the turtle shell.   Type help or ? to list commands.\n'
    prompt = '(turtle) '
    file = None

    def __init__(self, turtle_thread: TurtleDeviceThread):
        # TODO(Homework 4) \begin
        super(NoBlockingTurtleShell, self).__init__()
        turtle_thread.__message_thread__()
        # TODO(Homework 4) \end

    def do_execute(self, arg):
        # TODO(Homework 4) \begin
        turtle_thread.queue.put(parse(arg))
        # TODO(Homework 4) \end

    def do_exit(self, arg):
        # TODO(Homework 4) \begin
        turtle_thread.event.set()
        # TODO(Homework 4) \end

def parse(arg):
    'Convert a series of zero or more numbers to an argument tuple'
    return tuple(arg.split())

if __name__ == '__main__':
    turtle_thread = TurtleDeviceThread()
    # TODO(Homework 4: Correct start thread)
    NoBlockingTurtleShell(turtle_thread).cmdloop()