session deletion with culling (jupyter-server#387)

Author: Akshay Chitneni

data_studio_jupyter_extensions/configurables/kernel_monitor.py

@@ -110,8 +110,9 @@ async def poll(self):
         km = self.kernel_manager
 
         if self.is_culling_enabled():
-            await self.cull_if_idle()
-            return
+            culled = await self.cull_if_idle()
+            if culled:
+                return
 
         # If the kernel is communicating, we're good here.
         if km.is_communicating():
@@ -160,7 +161,7 @@ def is_culling_enabled(self) -> bool:
         """
         return self.cull_idle_timeout > 0
 
-    async def cull_if_idle(self):
+    async def cull_if_idle(self) -> bool:
         """Cull kernel if inactive."""
         km = self.kernel_manager
         dt_now = utcnow()
@@ -181,5 +182,9 @@ async def cull_if_idle(self):
             )
             # self._emit_console("Culling", msg) ## TODO: relay culled msg to user
             self.log.info(msg)
+            await km.shutdown_kernel()
+            self._fire_callbacks("dead")
             self.stop()
-            await km.shutdown_kernel()  ## TODO: clear sessionInfo for this kernel
+            return True
+        else:
+            return False