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Current File : //lib/python3.6/site-packages/pydbus/subscription.py
from gi.repository import Gio
from .exitable import ExitableWithAliases

class Subscription(ExitableWithAliases("unsubscribe", "disconnect")):
	Flags = Gio.DBusSignalFlags
	__slots__ = ()

	def __init__(self, con, sender, iface, member, object, arg0, flags, callback):
		id = con.signal_subscribe(sender, iface, member, object, arg0, flags, callback)
		self._at_exit(lambda: con.signal_unsubscribe(id))

class SubscriptionMixin(object):
	__slots__ = ()
	SubscriptionFlags = Subscription.Flags

	def subscribe(self, sender=None, iface=None, signal=None, object=None, arg0=None, flags=0, signal_fired=None):
		"""Subscribes to matching signals.

		Subscribes to signals on connection and invokes signal_fired callback
		whenever the signal is received.

		To receive signal_fired callback, you need an event loop.
		https://github.com/LEW21/pydbus/blob/master/doc/tutorial.rst#setting-up-an-event-loop

		Parameters
		----------
		sender : string, optional
			Sender name to match on (unique or well-known name) or None to listen from all senders.
		iface : string, optional
			Interface name to match on or None to match on all interfaces.
		signal : string, optional
			Signal name to match on or None to match on all signals.
		object : string, optional
			Object path to match on or None to match on all object paths.
		arg0 : string, optional
			Contents of first string argument to match on or None to match on all kinds of arguments.
		flags : SubscriptionFlags, optional
		signal_fired : callable, optional
			Invoked when there is a signal matching the requested data.
			Parameters: sender, object, iface, signal, params

		Returns
		-------
		Subscription
			An object you can use as a context manager to unsubscribe from the signal later.

		See Also
		--------
		See https://developer.gnome.org/gio/2.44/GDBusConnection.html#g-dbus-connection-signal-subscribe
		for more information.
		"""
		callback = (lambda con, sender, object, iface, signal, params: signal_fired(sender, object, iface, signal, params.unpack())) if signal_fired is not None else lambda *args: None
		return Subscription(self.con, sender, iface, signal, object, arg0, flags, callback)

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