#94 indicate outdated cluster data by pulsating

kube_ops_view/kubernetes.py

@@ -110,4 +110,9 @@ def query_kubernetes_cluster(cluster):
                                 container['resources']['usage'] = container_metrics['usage']
     except Exception as e:
         logger.warning('Failed to query pod metrics for cluster {}: {}'.format(cluster.id, get_short_error_message(e)))
-    return {'id': cluster_id, 'api_server_url': api_server_url, 'nodes': nodes, 'unassigned_pods': unassigned_pods}
+    return {
+        'id': cluster_id,
+        'api_server_url': api_server_url,
+        'nodes': nodes,
+        'unassigned_pods': unassigned_pods
+    }

kube_ops_view/main.py

@@ -88,9 +88,15 @@ def event(cluster_ids: set):
     # first sent full data once
     for cluster_id in app.store.get_cluster_ids():
         if not cluster_ids or cluster_id in cluster_ids:
+            status = app.store.get_cluster_status(cluster_id)
+            if status:
+                # send the cluster status including last_query_time BEFORE the cluster data
+                # so the UI knows how to render correctly from the start
+                yield 'event: clusterstatus\ndata: ' + json.dumps({'cluster_id': cluster_id, 'status': status}, separators=(',', ':')) + '\n\n'
             cluster = app.store.get_cluster_data(cluster_id)
             if cluster:
                 yield 'event: clusterupdate\ndata: ' + json.dumps(cluster, separators=(',', ':')) + '\n\n'
+
     while True:
         for event_type, event_data in app.store.listen():
             # hacky, event_data can be delta or full cluster object

kube_ops_view/update.py

@@ -55,6 +55,7 @@ def update_clusters(cluster_discoverer, query_cluster: callable, store, query_in
                     except Exception as e:
                         backoff = handle_query_failure(e, cluster, backoff)
                         status['backoff'] = backoff
+                        store.publish('clusterstatus', {'cluster_id': cluster.id, 'status': status})
                     else:
                         status['last_query_time'] = now
                         if backoff:
@@ -70,6 +71,8 @@ def update_clusters(cluster_discoverer, query_cluster: callable, store, query_in
                                 store.set_cluster_data(cluster.id, data)
                         else:
                             logger.info('Discovered new cluster {} ({}).'.format(cluster.id, cluster.api_server_url))
+                            # first send status with last_query_time!
+                            store.publish('clusterstatus', {'cluster_id': cluster.id, 'status': status})
                             store.publish('clusterupdate', data)
                             store.set_cluster_data(cluster.id, data)
                     store.set_cluster_status(cluster.id, status)