Only clean kernel client

Author: martinRenou

voila/notebook_renderer.py

@@ -252,6 +252,8 @@ async def _jinja_notebook_execute(self, nb, kernel_id):
         #  (it seems to be local to our block)
         nb.cells = result.cells
 
+        await self._cleanup_resources()
+
     async def _jinja_cell_generator(self, nb, kernel_id):
         """Generator that will execute a single notebook cell at a time"""
         nb, _ = ClearOutputPreprocessor().preprocess(
@@ -301,6 +303,11 @@ async def _jinja_cell_generator(self, nb, kernel_id):
             finally:
                 yield output_cell
 
+        await self._cleanup_resources()
+
+    async def _cleanup_resources(self):
+        await ensure_async(self.executor.kc.stop_channels())
+
     async def load_notebook(self, path):
 
         model = await ensure_async(self.contents_manager.get(path=path))