plugin XEP-0060, tmp(wokkel.rsm): small refactoring:

- don't use getRSMResponse anymore: rsm.PubSubClient use a different signature which return items and RSMResponse, this is better than the previous method as if the requested don't call getRSMResponse, there is no memory leak anymore.
    - use RSMResponse directly instead of using ext_data, as other extension (like MAM) will be probably be managed with an other workflow
    - don't do a useless deep copy of pubsub.PubSubRequest._parameters on each instance anymore
    - RSMResponse.parse do now manage parsing of <set/> element directly

src/plugins/plugin_xep_0060.py

@@ -34,7 +34,7 @@ from wokkel import pubsub
 from wokkel import rsm
 from zope.interface import implements
 from collections import namedtuple
-import uuid
+
 
 UNSPECIFIED = "unspecified error"
 
@@ -234,12 +234,11 @@ class XEP_0060(object):
                 - rsm_first, rsm_last, rsm_count, rsm_index: first, last, count and index value of RSMResponse
         """
         if rsm_request and item_ids:
-            raise ValueError("items_id can't be used with rsm")
+            raise ValueError(u"items_id can't be used with rsm")
         if extra is None:
             extra = {}
         client = self.host.getClient(profile_key)
-        ext_data = {'id': unicode(uuid.uuid4()), 'rsm': rsm_request} if rsm_request is not None else None
-        d = client.pubsub_client.items(service, node, max_items, item_ids, sub_id, client.pubsub_client.parent.jid, ext_data)
+        d = client.pubsub_client.items(service, node, max_items, item_ids, sub_id, client.pubsub_client.parent.jid, rsm_request)
 
         try:
             subscribe = C.bool(extra['subscribe'])
@@ -248,7 +247,7 @@ class XEP_0060(object):
 
         def subscribeEb(failure, service, node):
             failure.trap(error.StanzaError)
-            log.warning("Could not subscribe to node {} on service {}: {}".format(node, unicode(service), unicode(failure.value)))
+            log.warning(u"Could not subscribe to node {} on service {}: {}".format(node, unicode(service), unicode(failure.value)))
 
         def doSubscribe(items):
             self.subscribe(service, node, profile_key=profile_key).addErrback(subscribeEb, service, node)
@@ -257,11 +256,12 @@ class XEP_0060(object):
         if subscribe:
             d.addCallback(doSubscribe)
 
-        def addMetadata(items):
-            metadata = {}
-            if rsm_request is not None:
-                rsm_data = client.pubsub_client.getRSMResponse(ext_data['id'])
-                metadata.update({'rsm_{}'.format(key): value for key, value in rsm_data.iteritems()})
+        def addMetadata(result):
+            items, rsm_response = result
+            if rsm_request is not None and rsm_response is not None:
+                metadata = {'rsm_{}'.format(key): value for key, value in rsm_response.toDict().iteritems()}
+            else:
+                metadata = {}
             return (items, metadata)
 
         d.addCallback(addMetadata)