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#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later
import dbus
import dbus.exceptions
import dbus.mainloop.glib
import dbus.service
try:
from gi.repository import GObject
except ImportError:
import gobject as GObject
import sys
mainloop = None
app = None
bus = None
BLUEZ_SERVICE_NAME = 'org.bluez'
DBUS_OM_IFACE = 'org.freedesktop.DBus.ObjectManager'
DBUS_PROP_IFACE = 'org.freedesktop.DBus.Properties'
BATTERY_PROVIDER_MANAGER_IFACE = 'org.bluez.BatteryProviderManager1'
BATTERY_PROVIDER_IFACE = 'org.bluez.BatteryProvider1'
BATTERY_PROVIDER_PATH = '/path/to/provider'
BATTERY_PATH1 = '11_11_11_11_11_11'
BATTERY_PATH2 = '22_22_22_22_22_22'
BATTERY_PATH3 = '33_33_33_33_33_33'
class InvalidArgsException(dbus.exceptions.DBusException):
_dbus_error_name = 'org.freedesktop.DBus.Error.InvalidArgs'
class Application(dbus.service.Object):
def __init__(self, bus):
self.path = BATTERY_PROVIDER_PATH
self.services = []
self.batteries = []
dbus.service.Object.__init__(self, bus, self.path)
def get_path(self):
return dbus.ObjectPath(self.path)
def add_battery(self, battery):
self.batteries.append(battery)
self.InterfacesAdded(battery.get_path(), battery.get_properties())
GObject.timeout_add(1000, drain_battery, battery)
def remove_battery(self, battery):
self.batteries.remove(battery)
self.InterfacesRemoved(battery.get_path(), [BATTERY_PROVIDER_IFACE])
@dbus.service.method(DBUS_OM_IFACE, out_signature='a{oa{sa{sv}}}')
def GetManagedObjects(self):
response = {}
print('GetManagedObjects called')
for battery in self.batteries:
response[battery.get_path()] = battery.get_properties()
return response
@dbus.service.signal(DBUS_OM_IFACE, signature='oa{sa{sv}}')
def InterfacesAdded(self, object_path, interfaces_and_properties):
return
@dbus.service.signal(DBUS_OM_IFACE, signature='oas')
def InterfacesRemoved(self, object_path, interfaces):
return
class Battery(dbus.service.Object):
"""
org.bluez.BatteryProvider1 interface implementation
"""
def __init__(self, bus, dev, percentage, source = None):
self.path = BATTERY_PROVIDER_PATH + '/dev_' + dev
self.dev_path = '/org/bluez/hci0/dev_' + dev
self.bus = bus
self.percentage = percentage
self.source = source
dbus.service.Object.__init__(self, bus, self.path)
def get_battery_properties(self):
properties = {}
if self.percentage != None:
properties['Percentage'] = dbus.Byte(self.percentage)
if self.source != None:
properties['Source'] = self.source
properties['Device'] = dbus.ObjectPath(self.dev_path)
return properties
def get_properties(self):
return { BATTERY_PROVIDER_IFACE: self.get_battery_properties() }
def get_path(self):
return dbus.ObjectPath(self.path)
def set_percentage(self, percentage):
if percentage < 0 or percentage > 100:
print('percentage not valid')
return
self.percentage = percentage
print('battery %s percentage %d' % (self.path, self.percentage))
self.PropertiesChanged(
BATTERY_PROVIDER_IFACE, self.get_battery_properties())
@dbus.service.method(DBUS_PROP_IFACE,
in_signature='s',
out_signature='a{sv}')
def GetAll(self, interface):
if interface != BATTERY_PROVIDER_IFACE:
raise InvalidArgsException()
return self.get_properties()[BATTERY_PROVIDER_IFACE]
@dbus.service.signal(DBUS_PROP_IFACE, signature='sa{sv}')
def PropertiesChanged(self, interface, properties):
return
def add_late_battery():
app.add_battery(Battery(bus, BATTERY_PATH3, 70, 'Protocol 2'))
def drain_battery(battery):
new_percentage = 100
if battery.percentage != None:
new_percentage = battery.percentage - 5
if new_percentage < 0:
new_percentage = 0
battery.set_percentage(new_percentage)
if new_percentage <= 0:
return False
return True
def register_provider_cb():
print('Battery Provider registered')
# Battery added early right after RegisterBatteryProvider succeeds
app.add_battery(Battery(bus, BATTERY_PATH2, None))
# Battery added later
GObject.timeout_add(5000, add_late_battery)
def register_provider_error_cb(error):
print('Failed to register Battery Provider: ' + str(error))
mainloop.quit()
def find_manager(bus):
remote_om = dbus.Interface(bus.get_object(BLUEZ_SERVICE_NAME, '/'),
DBUS_OM_IFACE)
objects = remote_om.GetManagedObjects()
for o, props in objects.items():
if BATTERY_PROVIDER_MANAGER_IFACE in props.keys():
return o
return None
def unregister_provider_cb():
print('Battery Provider unregistered')
def unregister_provider_error_cb(error):
print('Failed to unregister Battery Provider: ' + str(error))
def unregister_battery_provider(battery_provider_manager):
battery_provider_manager.UnregisterBatteryProvider(BATTERY_PROVIDER_PATH,
reply_handler=unregister_provider_cb,
error_handler=unregister_provider_error_cb)
def remove_battery(app, battery):
app.remove_battery(battery)
"""
Simulates an application registering to BlueZ as a Battery Provider providing
fake batteries drained periodically.
"""
def main():
global mainloop, bus, app
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()
manager_path = find_manager(bus)
if not manager_path:
print('BatteryProviderManager1 interface not found')
return
print('BatteryProviderManager1 path = ', manager_path)
battery_provider_manager = dbus.Interface(
bus.get_object(BLUEZ_SERVICE_NAME, manager_path),
BATTERY_PROVIDER_MANAGER_IFACE)
app = Application(bus)
# Battery pre-added before RegisterBatteryProvider
battery1 = Battery(bus, BATTERY_PATH1, 87, 'Protocol 1')
app.add_battery(battery1)
mainloop = GObject.MainLoop()
print('Registering Battery Provider...')
battery_provider_manager.RegisterBatteryProvider(BATTERY_PROVIDER_PATH,
reply_handler=register_provider_cb,
error_handler=register_provider_error_cb)
# Unregister the Battery Provider after an arbitrary amount of time
GObject.timeout_add(
12000, unregister_battery_provider, battery_provider_manager)
# Simulate battery removal by a provider
GObject.timeout_add(8000, remove_battery, app, battery1)
mainloop.run()
if __name__ == '__main__':
main()
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