Set JPY_SESSION_NAME to the notebook path (same as jupyer_server does)

Author: nocnokneo

voila/handler.py

@@ -155,7 +155,8 @@ async def get_generator(self, path=None):
             ) = await self.kernel_manager.get_rendered_notebook(
                 notebook_name=notebook_path,
                 extra_kernel_env_variables={
-                    ENV_VARIABLE.VOILA_REQUEST_URL: self.request.full_url()
+                    ENV_VARIABLE.VOILA_REQUEST_URL: self.request.full_url(),
+                    "JPY_SESSION_NAME": notebook_path,
                 },
             )
 
@@ -234,6 +235,7 @@ def time_out():
                 return "<script>window.voila_heartbeat()</script>\n"
 
             kernel_env = {**os.environ, **request_info}
+            kernel_env["JPY_SESSION_NAME"] = notebook_path
             kernel_env[ENV_VARIABLE.VOILA_PREHEAT] = "False"
             kernel_env[ENV_VARIABLE.VOILA_BASE_URL] = self.base_url
             kernel_env[ENV_VARIABLE.VOILA_SERVER_URL] = self.settings.get(