Do not do a dbus call every time get_file_items is called

nautilus-extension/kdeconnect-share.py

@@ -30,6 +30,7 @@ __website__ = "https://community.kde.org/KDEConnect"
 
 import gettext
 import locale
+from functools import partial
 
 from gi.repository import Nautilus, Gio, GLib, GObject
 
@@ -38,9 +39,22 @@ _ = gettext.gettext
 class KdeConnectShareExtension(GObject.GObject, Nautilus.MenuProvider):
     """A context menu for sending files via KDE Connect."""
 
+    def refresh_devices_list(self, *args, **kwargs):
+        try:
+            onlyReachable = True
+            onlyPaired = True
+            variant = GLib.Variant('(bb)', (onlyReachable, onlyPaired))
+            devices = self.dbus.call_sync('deviceNames', variant, 0, -1, None)
+            self.devices = devices.unpack()[0]
+        except Exception as e:
+            raise Exception('Error while getting reachable devices')
+
+
     def __init__(self):
         GObject.GObject.__init__(self)
 
+        self.devices = {}
+
         try:
             locale.setlocale(locale.LC_ALL, '')
             gettext.bindtextdomain('kdeconnect-nautilus-extension')
@@ -57,6 +71,21 @@ class KdeConnectShareExtension(GObject.GObject, Nautilus.MenuProvider):
             'org.kde.kdeconnect.daemon',
             None)
 
+        connection = Gio.bus_get_sync(
+            Gio.BusType.SESSION,
+            None)
+        connection.signal_subscribe(
+            None,
+            'org.kde.kdeconnect.daemon',
+            'deviceListChanged',
+            "/modules/kdeconnect",
+            None,
+            Gio.DBusSignalFlags.NONE,
+            partial(self.refresh_devices_list, self),
+        )
+
+        self.refresh_devices_list()
+
     def send_files(self, menu, files, deviceId):
         device_proxy = Gio.DBusProxy.new_for_bus_sync(
             Gio.BusType.SESSION,
@@ -78,20 +107,13 @@ class KdeConnectShareExtension(GObject.GObject, Nautilus.MenuProvider):
             if uri.get_uri_scheme() != 'file' or uri.is_directory():
                 return
 
-        try:
-            onlyReachable = True
-            onlyPaired = True
-            variant = GLib.Variant('(bb)', (onlyReachable, onlyPaired))
-            devices = self.dbus.call_sync('deviceNames', variant, 0, -1, None)
-            devices = devices.unpack()[0]
-        except Exception as e:
-            raise Exception('Error while getting reachable devices')
+        devices = self.devices
 
         if len(devices) == 0:
             return
 
         if len(devices) == 1:
-            deviceId, deviceName = devices.items()[0]
+            deviceId, deviceName = devices[0], devices[0]
             item = Nautilus.MenuItem(
                         name='KdeConnectShareExtension::Devices::' + deviceId,
                         label=_("Send to %s via KDE Connect") % deviceName,