--- a/sat/plugins/plugin_xep_0329.py	Tue Nov 30 23:31:09 2021 +0100
+++ b/sat/plugins/plugin_xep_0329.py	Wed Dec 01 16:13:31 2021 +0100
@@ -19,6 +19,7 @@
 import mimetypes
 import json
 import os
+import traceback
 from pathlib import Path
 from typing import Optional, Dict
 from zope.interface import implementer
@@ -33,6 +34,7 @@
 from sat.core.constants import Const as C
 from sat.core.log import getLogger
 from sat.tools import stream
+from sat.tools import utils
 from sat.tools.common import regex
 
 
@@ -453,9 +455,9 @@
         iq_elt.handled = True
         node = iq_elt.query.getAttribute("node")
         if not node:
-            d = defer.maybeDeferred(root_nodes_cb, client, iq_elt)
+            d = utils.asDeferred(root_nodes_cb, client, iq_elt)
         else:
-            d = defer.maybeDeferred(files_from_node_cb, client, iq_elt, node)
+            d = utils.asDeferred(files_from_node_cb, client, iq_elt, node)
         d.addErrback(
             lambda failure_: log.error(
                 _("error while retrieving files: {msg}").format(msg=failure_)
@@ -589,10 +591,9 @@
         @return (tuple[jid.JID, jid.JID]): peer_jid and owner
         """
 
-    @defer.inlineCallbacks
-    def _compGetRootNodesCb(self, client, iq_elt):
+    async def _compGetRootNodesCb(self, client, iq_elt):
         peer_jid, owner = client.getOwnerAndPeer(iq_elt)
-        files_data = yield self.host.memory.getFiles(
+        files_data = await self.host.memory.getFiles(
             client,
             peer_jid=peer_jid,
             parent="",
@@ -607,8 +608,7 @@
             directory_elt["name"] = name
         client.send(iq_result_elt)
 
-    @defer.inlineCallbacks
-    def _compGetFilesFromNodeCb(self, client, iq_elt, node_path):
+    async def _compGetFilesFromNodeCb(self, client, iq_elt, node_path):
         """Retrieve files from local files repository according to permissions
 
         result stanza is then built and sent to requestor
@@ -618,7 +618,7 @@
         """
         peer_jid, owner = client.getOwnerAndPeer(iq_elt)
         try:
-            files_data = yield self.host.memory.getFiles(
+            files_data = await self.host.memory.getFiles(
                 client, peer_jid=peer_jid, path=node_path, owner=owner
             )
         except exceptions.NotFound:
@@ -628,7 +628,8 @@
             self._iqError(client, iq_elt, condition='not-allowed')
             return
         except Exception as e:
-            log.error("internal server error: {e}".format(e=e))
+            tb = traceback.format_tb(e.__traceback__)
+            log.error(f"internal server error: {e}\n{''.join(tb)}")
             self._iqError(client, iq_elt, condition='internal-server-error')
             return
         iq_result_elt = xmlstream.toResponse(iq_elt, "result")