Fix the data form retrieval, by making it non-blocking

src/fixes.py

@@ -37,20 +37,20 @@ def get_version(xmpp, jid, callback=None, **kwargs):
         return handle_result(result)
 
 
-def get_room_form(xmpp, room):
+def get_room_form(xmpp, room, callback):
+    def _cb(result):
+        if result["type"] == "error":
+            callback(None)
+        xform = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
+        if xform is None:
+            callback(None)
+        form = xmpp.plugin['xep_0004'].buildForm(xform)
+        callback(form)
+
     iq = xmpp.make_iq_get(ito=room)
     query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
     iq.append(query)
-    try:
-        result = iq.send()
-    except:
-        return False
-    xform = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
-    if xform is None:
-        return False
-    form = xmpp.plugin['xep_0004'].buildForm(xform)
-    return form
-
+    iq.send(callback=_cb)
 
 def _filter_add_receipt_request(self, stanza):
     """

src/tabs/muctab.py

@@ -361,13 +361,15 @@ class MucTab(ChatTab):
         """
         /configure
         """
-        form = fixes.get_room_form(self.core.xmpp, self.name)
-        if not form:
-            self.core.information(
+        def on_form_received(form):
+            if not form:
+                self.core.information(
                     _('Could not retrieve the configuration form'),
                     _('Error'))
-            return
-        self.core.open_new_form(form, self.cancel_config, self.send_config)
+                return
+            self.core.open_new_form(form, self.cancel_config, self.send_config)
+
+        form = fixes.get_room_form(self.core.xmpp, self.name, on_form_received)
 
     def cancel_config(self, form):
         """