68 lines
1.6 KiB
Python
68 lines
1.6 KiB
Python
#
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#
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#
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from __future__ import absolute_import, division, print_function, unicode_literals
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from logging import getLogger, INFO as _INFO
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_log = getLogger(__name__)
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del getLogger
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#
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# As suggested here: http://stackoverflow.com/a/13548984
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#
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_suspend_callback = None
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def _suspend():
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if _suspend_callback:
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if _log.isEnabledFor(_INFO):
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_log.info("received suspend event from UPower")
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_suspend_callback()
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_resume_callback = None
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def _resume():
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if _resume_callback:
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if _log.isEnabledFor(_INFO):
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_log.info("received resume event from UPower")
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_resume_callback()
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def watch(on_resume_callback, on_suspend_callback):
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"""Register callback for suspend/resume events.
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They are called only if the system DBus is running, and the UPower daemon is available."""
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global _resume_callback, _suspend_callback
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_suspend_callback = on_suspend_callback
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_resume_callback = on_resume_callback
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try:
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import dbus
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_UPOWER_BUS = 'org.freedesktop.UPower'
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_UPOWER_INTERFACE = 'org.freedesktop.UPower'
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# integration into the main GLib loop
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from dbus.mainloop.glib import DBusGMainLoop
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DBusGMainLoop(set_as_default=True)
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bus = dbus.SystemBus()
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assert bus
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bus.add_signal_receiver(_suspend, signal_name='Sleeping',
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dbus_interface=_UPOWER_INTERFACE, bus_name=_UPOWER_BUS)
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bus.add_signal_receiver(_resume, signal_name='Resuming',
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dbus_interface=_UPOWER_INTERFACE, bus_name=_UPOWER_BUS)
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if _log.isEnabledFor(_INFO):
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_log.info("connected to system dbus, watching for suspend/resume events")
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except:
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# Either:
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# - the dbus library is not available
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# - the system dbus is not running
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_log.warn("failed to register suspend/resume callbacks")
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pass
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