Tango Server restart "dynamic" attributes

PowerSupply.py

import os
import sys
import time
import threading

from tango.server import Device, attribute, command

attrs = [
  dict(name='voltage', dtype=float, label='Voltage', fget=lambda dev: 1.2345),
  dict(name='power_level', dtype=str, label='Power level', fget=lambda d: 'high')
]


def restart():
    # give some time for device to reply to restart command execution
    time.sleep(0.01)
    pid = os.getpid()
    with open('/proc/{}/cmdline'.format(pid), 'rb') as fobj:
        cmdline = fobj.read()
    cmdline = cmdline.strip().split(b'\x00')
    print('Restarting {}'.format(cmdline))
    os.execl(sys.executable, *cmdline)


class Mixin:
    """Just to store attributes before the Device.__new__ gets called"""
    pass


for attr in attrs:
    setattr(Mixin, attr['name'], attribute(**attr))


class DevTest(Mixin, Device):

    @command
    def restart(self):
        task = threading.Thread(target=restart)
        task.start()


PowerSupply.run_server()