UI showing that the Session Manager is synching. (jupyter-server#347)

* tell the user that the sessions are syncing in the UI

* center syncing component on running tab

* if reconnecting after a missed heartbeat, clear the status

* ignore tests for running tab

data_studio_jupyter_extensions/configurables/kernel_restarter.py

@@ -60,7 +60,13 @@ async def poll(self):
 
         # If the kernel is communicating, we're good here.
         if km.is_communicating():
+            if self._attempt_count > 0:
+                self._emit_status(
+                    status="Connected.",
+                    description="",
+                )
             self._connected_once = True
+            self._attempt_count = 0
             return
 
         now = time.time()

data_studio_jupyter_extensions/configurables/session_manager.py

@@ -144,6 +144,21 @@ async def start_kernel_for_session(self, session_id, path, name, type, kernel_na
         )
         return model
 
+    async def list_sessions(self):
+        self.telemetry_bus.record_event(
+            schema_name="event.datastudio.jupyter.com/syncing-state",
+            version=1,
+            event={"state": "Syncing..."},
+        )
+        out = await super().list_sessions()
+
+        self.telemetry_bus.record_event(
+            schema_name="event.datastudio.jupyter.com/syncing-state",
+            version=1,
+            event={"state": "Synced."},
+        )
+        return out
+
     async def save_session(
         self, session_id, path=None, name=None, type=None, kernel_id=None
     ):

data_studio_jupyter_extensions/extensions/telemetry/extension.py

@@ -43,5 +43,6 @@ def initialize_configurables(self):
                 "event.datastudio.jupyter.com/session-message",
                 "event.datastudio.jupyter.com/kernel-blocked",
                 "event.datastudio.jupyter.com/kernel-failed",
+                "event.datastudio.jupyter.com/syncing-state",
             ],
         )

data_studio_jupyter_extensions/extensions/telemetry/schemas/sessions/syncing-state.v1.yaml

@@ -0,0 +1,13 @@
+$id: event.datastudio.jupyter.com/syncing-state
+version: 1
+title: Session Syncing State
+description: |
+  Emit a message from the kernel provisioner
+type: object
+properties:
+  state:
+    title: Syncing State
+    description: |
+      State of the synchronizer
+required:
+  - state

jest.config.js

@@ -11,7 +11,9 @@ config.coveragePathIgnorePatterns = [
   './test',
   './src/handler.ts',
   './src/utils.ts',
-  './src/autostartingkernels.ts'
+  './src/autostartingkernels.ts',
+  './src/runningtab.ts',
+  './src/kernelinfo.tsx'
 ];
 config.coverageThreshold = {
   global: {