core: added a "profileConnecting" method check:

if a plugin has a profileConnecting method, it will be called when the profile is being connected but before the client stream is started. That can be usefull if things need to be done before the communication is started: e.g. putting triggers, loading PersistentDict, etc.

src/core/sat_main.py

@@ -265,9 +265,13 @@ class SAT(service.Service):
         for plugin in self.plugins.iteritems():
             if plugin[1].is_handler:
                 plugin[1].getHandler(profile).setHandlerParent(current)
-            connected_cb = getattr(plugin[1], "profileConnected", None)
+            connected_cb = getattr(plugin[1], "profileConnected", None) # profile connected is called after client is ready and roster is got
             if connected_cb:
                 plugin_conn_cb.append((plugin[0], connected_cb))
+            try:
+                yield plugin[1].profileConnecting(profile) # profile connecting is called before actually starting client
+            except AttributeError:
+                pass
 
         current.startService()
 
@@ -290,7 +294,7 @@ class SAT(service.Service):
                                   {'name': plugin_conn_cb[idx][0], 'failure': result})
 
         yield list_d.addCallback(logPluginResults) # FIXME: we should have a timeout here, and a way to know if a plugin freeze
-        # TODO: mesure time to launch of each plugin
+        # TODO: mesure launch time of each plugin
 
     def _authenticateProfile(self, password, profile):
         """Authenticate the profile.