gajim-plural/gajim/logind_listener.py

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## src/logind_listener.py
##
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## Copyright (C) 2014 Kamil Paral <kamil.paral AT gmail.com>
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
##
'''
Watch for system suspend using systemd-logind.
Documentation: http://www.freedesktop.org/wiki/Software/systemd/inhibit
'''
import os
import logging
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from gi.repository import Gio, GLib
from gajim.common import app
log = logging.getLogger('gajim.logind_listener')
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# file descriptor of the inhibitor; negative number means we don't
# hold any (yet)
fd = -1
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def signal_received(connection, sender_name, object_path,
interface_name, signal_name, parameters, *user_data):
'''Signal handler for suspend event'''
global fd
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connected = None
log.info('Signal received: %s - %s', interface_name, parameters)
# signal is sent right before (with the parameter True) and after
# (with the parameter False) the system goes down for suspend/hibernate
if not parameters[0]:
return
# we're going for suspend, let's disconnect
log.debug('System suspend detected, disconnecting from network…')
for name, conn in app.connections.items():
if app.account_is_connected(name):
conn.old_show = app.SHOW_LIST[conn.connected]
st = conn.status
conn.change_status('offline', _('Machine going to sleep'))
conn.status = st
conn.time_to_reconnect = 5
# close the file descriptor and let the computer suspend
if fd >= 0:
os.close(fd)
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fd = -1
else:
# something is wrong, the system is suspending but we don't have
# a lock file
log.warning("System suspend detected, but we don't seem to be holding "
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"a file descriptor for sleep inihibitor")
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def get_inhibitor(connection):
'''Ask for a suspend delay inhibitor'''
global fd
if fd >= 0:
# someting is wrong, we haven't closed the previous file descriptor
# and we ask for yet another one
log.warning('We are about to ask for a sleep inhibitor, but we seem '
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'to be holding one already')
ret = connection.call_sync(
'org.freedesktop.login1',
'/org/freedesktop/login1',
'org.freedesktop.login1.Manager',
'Inhibit',
GLib.Variant('(ssss)', ('sleep', 'org.gajim.Gajim',
'Disconnect from the network', 'delay')),
None,
Gio.DBusCallFlags.NONE, -1, None)
fd = ret[0]
def appeared(connection, name, name_owner, *user_data):
'''Set up a listener for suspend signals'''
global supported
supported = True
log.info('%s appeared', name)
if name == 'org.freedesktop.login1':
connection.signal_subscribe(
'org.freedesktop.login1',
'org.freedesktop.login1.Manager',
'PrepareForSleep',
'/org/freedesktop/login1',
None,
Gio.DBusSignalFlags.NONE,
signal_received,
None)
get_inhibitor(connection)
Gio.bus_watch_name(
Gio.BusType.SYSTEM,
'org.freedesktop.login1',
Gio.BusNameWatcherFlags.NONE,
appeared,
None)