Inhibit suspend in gnome while rendering in blender

inhibit_suspend.py

# © Michael Demetriou 2017

#    This program 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, either version 3 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 General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

bl_info = {
    "name": "Inhibit suspend while rendering - for gnome",
    "author": "Michael Demetriou",
    "version": (1, 0),
    "blender": (2, 78, 0),
    "description": "Inhibits system suspend while rendering",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "https://gist.github.com/qwazix/290a25576f8c1f80cbc929f5a5d3f27e",
    "category": "System"}
###########################################################################

import bpy
import dbus
from bpy.app.handlers import persistent

cookie = 0
_session_bus = dbus.SessionBus()
_dbus_screensaver = _session_bus.get_object('org.gnome.SessionManager','/org/gnome/SessionManager')
inhibit = _dbus_screensaver.get_dbus_method('Inhibit','org.gnome.SessionManager')
uninhibit = _dbus_screensaver.get_dbus_method('Uninhibit','org.gnome.SessionManager')

@persistent
def render_pre_handler(dummy):
    global cookie
    cookie = inhibit("BlenderRendering",dbus.UInt32(0),"inhibiting",dbus.UInt32(4));

@persistent
def render_post_handler(dummy):
    global cookie
    uninhibit(dbus.UInt32(cookie));    

def register():
    bpy.app.handlers.render_pre.append(render_pre_handler)
    bpy.app.handlers.render_post.append(render_post_handler)
    
def unregister():
    bpy.app.handlers.render_pre.remove(render_pre_handler)
    bpy.app.handlers.render_post.remove(render_post_handler)

if __name__ == "__main__":
    register()