7 from gi.repository import GObject
9 logger = logging.getLogger("onoff.dbusutils")
11 object_prefix = "/de/subdivi/onoff0"
12 default_busname = "de.subdivi.onoff0"
14 dbus_options = argparse.ArgumentParser(add_help=False)
15 dbus_options.add_argument("--bus", default="session",
16 choices=("system", "session"),
17 help="which bus to use (default: %(default)s)")
18 dbus_options.add_argument("--busname", type=str, default=default_busname,
19 help="which busname (i.e. client) to use " +
20 "(default: %(default)s)")
21 dbus_options.add_argument("--device", type=str, required=True,
22 help="which device to control")
24 def get_dbus_proxy(namespace):
26 @param namespace: a namespace returned from a dbus_options argument parser
27 @returns: a dbus object proxy
29 if namespace.bus == "session":
30 bus = dbus.SessionBus()
31 elif namespace.bus == "system":
32 bus = dbus.SystemBus()
34 raise AssertionError("namespace.bus %r is neither session nor system",
36 objname = "%s/%s" % (object_prefix, namespace.device)
37 return bus.get_object(namespace.busname, objname)
40 """Create a socket pair where the latter end is already wrapped for
41 transmission over dbus.
43 @rtype: (socket, dbus.types.UnixFd)
45 s1, s2 = socket.socketpair()
46 s3 = dbus.types.UnixFd(s2)
50 class OnoffControl(dbus.service.Object):
51 domain = default_busname
54 def __init__(self, bus, name, device):
58 @type device: OnoffDevice
60 busname = dbus.service.BusName(self.domain, bus=bus)
61 dbus.service.Object.__init__(self, busname, "%s/%s" % (self.path, name))
64 device.notify.add(self.changestate)
66 @dbus.service.signal(domain, signature="q")
67 def changestate(self, state):
68 logger.debug("emitting state %d", state)
70 @dbus.service.method(domain, out_signature="q")
72 return self.device.state
74 @dbus.service.method(domain, in_signature="q", out_signature="q")
75 def activatetime(self, duration):
76 """Activate the device for a given number of seconds."""
77 logger.info("activatetime %d", duration)
78 GObject.timeout_add(duration * 1000, self.unuse)
81 @dbus.service.method(domain, in_signature="", out_signature="qh")
83 """Activate a device until the returned file descriptor is closed."""
84 logger.info("activatefd")
85 notifyfd, retfd = socketpair()
87 logger.info("fd %d completed", fd.fileno())
91 GObject.io_add_watch(notifyfd, GObject.IO_HUP|GObject.IO_ERR, callback)
92 return (self.use(), retfd)
96 if self.usecount <= 1:
97 self.device.activate()
98 return self.device.state
102 if not self.usecount:
103 self.device.deactivate()
105 logger.debug("%d users left", self.usecount)