5430e04e1c
Do not close event loop in utility function - handle it only in main(). For this reason, change appropriate functions to coroutines. Fixes QubesOS/qubes-issues#2865
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# -*- encoding: utf8 -*-
|
|
#
|
|
# The Qubes OS Project, http://www.qubes-os.org
|
|
#
|
|
# Copyright (C) 2017 Marek Marczykowski-Górecki
|
|
# <marmarek@invisiblethingslab.com>
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published by
|
|
# the Free Software Foundation; either version 2.1 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License along
|
|
# with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
''' Utilities for common events-based actions '''
|
|
|
|
import asyncio
|
|
import functools
|
|
|
|
import qubesadmin.events
|
|
import qubesadmin.exc
|
|
|
|
|
|
|
|
class Interrupt(Exception):
|
|
'''Interrupt events processing'''
|
|
|
|
|
|
def interrupt_on_vm_shutdown(vm, subject, event):
|
|
'''Interrupt events processing when given VM was shutdown'''
|
|
# pylint: disable=unused-argument
|
|
if event == 'connection-established':
|
|
if vm.is_halted():
|
|
raise Interrupt
|
|
elif event == 'domain-shutdown' and vm == subject:
|
|
raise Interrupt
|
|
|
|
|
|
@asyncio.coroutine
|
|
def wait_for_domain_shutdown(vm, timeout, loop=None):
|
|
''' Helper function to wait for domain shutdown.
|
|
|
|
This function wait for domain shutdown, but do not initiate the shutdown
|
|
itself.
|
|
|
|
:param vm: QubesVM object to wait for shutdown on
|
|
:param timeout: Timeout in seconds, use 0 for no timeout
|
|
:param loop: asyncio event loop
|
|
'''
|
|
if loop is None:
|
|
loop = asyncio.get_event_loop()
|
|
events = qubesadmin.events.EventsDispatcher(vm.app)
|
|
events.add_handler('domain-shutdown',
|
|
functools.partial(interrupt_on_vm_shutdown, vm))
|
|
events.add_handler('connection-established',
|
|
functools.partial(interrupt_on_vm_shutdown, vm))
|
|
events_task = asyncio.ensure_future(events.listen_for_events(),
|
|
loop=loop)
|
|
if timeout:
|
|
# pylint: disable=no-member
|
|
loop.call_later(timeout, events_task.cancel)
|
|
try:
|
|
yield from events_task
|
|
except asyncio.CancelledError:
|
|
raise qubesadmin.exc.QubesVMShutdownTimeout(
|
|
'VM %s shutdown timeout expired', vm.name)
|
|
except Interrupt:
|
|
pass
|