core: added a getReady method which can be called by frontends to ensure that backend is fully initialised before doing anything + this ckeck is automatically done in asyncConnect

src/bridge/DBus.py

@@ -355,6 +355,12 @@ class DbusObject(dbus.service.Object):
     def getProgress(self, id, profile):
         return self._callback("getProgress", unicode(id), unicode(profile))
 
+    @dbus.service.method(const_INT_PREFIX+const_CORE_SUFFIX,
+                         in_signature='', out_signature='',
+                         async_callbacks=('callback', 'errback'))
+    def getReady(self, callback=None, errback=None):
+        return self._callback("getReady", callback=callback, errback=errback)
+
     @dbus.service.method(const_INT_PREFIX+const_CORE_SUFFIX,
                          in_signature='', out_signature='s',
                          async_callbacks=None)

src/bridge/bridge_constructor/bridge_template.ini

@@ -156,6 +156,14 @@ doc_param_3=%(doc_profile)s
 
 ;methods
 
+[getReady]
+async=
+type=method
+category=core
+sig_in=
+sig_out=
+doc=Return when backend is initialised
+
 [getVersion]
 type=method
 category=core