First steps to multi model plugin

stt_voice_messages/helper.py

@@ -0,0 +1,65 @@
+# This file is part of Gajim.
+#
+# Gajim is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Gajim is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
+
+from gi.repository import Gio, GObject
+
+'''
+https://discourse.gnome.org/t/gtk-threading-problem-with-glib-idle-add/13597/5
+https://github.com/gdm-settings/gdm-settings/blob/f245d3000200fa6be2a35c7f6ac45b131dadb5d6/src/utils.py#L116..L162
+'''
+
+
+class BackgroundTask(GObject.Object):
+    __gtype_name__ = 'BackgroundTask'
+
+    def __init__(self, function, finish_callback, **kwargs):
+        super().__init__(**kwargs)
+
+        self.function = function
+        self.finish_callback = finish_callback
+        self._current = None
+
+    def start(self):
+        if self._current:
+            AlreadyRunningError('Task is already running')
+
+        finish_callback = lambda self, task, nothing: self.finish_callback()
+
+        task = Gio.Task.new(self, None, finish_callback, None)
+        task.run_in_thread(self._thread_cb)
+
+        self._current = task
+
+    @staticmethod
+    def _thread_cb(task, self, task_data, cancellable):
+        try:
+            retval = self.function()
+            task.return_value(retval)
+        except Exception as e:
+            task.return_value(e)
+
+    def finish(self):
+        task = self._current
+        self._current = None
+
+        if not Gio.Task.is_valid(task, self):
+            raise InvalidGioTaskError()
+
+        value = task.propagate_value().value
+
+        if isinstance(value, Exception):
+            raise value
+
+        return value