fix: status UI hangs with a blank screen; shows no pool updates

Signed-off-by: Nick Mitchell <[email protected]>

Author: starpit

pkg/be/kubernetes/logs.go

@@ -3,9 +3,7 @@ package kubernetes
 import (
 	"bufio"
 	"context"
-	"fmt"
 	corev1 "k8s.io/api/core/v1"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	"lunchpail.io/pkg/observe/events"
 	"strings"
@@ -18,18 +16,18 @@ type LogLine struct {
 	Message   string
 }
 
-func streamLogUpdatesForComponent(run, namespace string, component events.Component, onlyInfo bool, c chan events.Message) error {
+func streamLogUpdatesForComponent(podName, namespace string, component events.Component, onlyInfo bool, c chan events.Message) error {
 	clientset, _, err := Client()
 	if err != nil {
 		return err
 	}
 
-	podName, err := findPodName(run, namespace, component, clientset)
-	if err != nil {
-		return err
-	}
+	// TODO leak?
+	go func() error {
+		return streamLogUpdatesForPod(podName, namespace, component, onlyInfo, clientset, c)
+	}()
 
-	return streamLogUpdatesForPod(podName, namespace, component, onlyInfo, clientset, c)
+	return nil
 }
 
 func streamLogUpdatesForWorker(podName, namespace string, c chan events.Message) error {
@@ -97,24 +95,3 @@ func streamLogUpdatesForPod(podName, namespace string, component events.Componen
 
 	return nil
 }
-
-func findPodName(run, namespace string, component events.Component, clientset *kubernetes.Clientset) (string, error) {
-	for {
-		listOptions := metav1.ListOptions{
-			LabelSelector: "app.kubernetes.io/component=" + string(component) + ",app.kubernetes.io/instance=" + run,
-		}
-
-		if pods, err := clientset.
-			CoreV1().
-			Pods(namespace).
-			List(context.Background(), listOptions); err != nil {
-			return "", err
-		} else if len(pods.Items) == 0 {
-			time.Sleep(1 * time.Second)
-		} else if len(pods.Items) != 1 {
-			return "", fmt.Errorf("Multiple %v instances found for run=%s namespace=%s\n", component, run, namespace)
-		} else {
-			return pods.Items[0].Name, nil
-		}
-	}
-}

pkg/be/kubernetes/updates.go

@@ -21,8 +21,9 @@ func startWatching(app, run, namespace string) (watch.Interface, error) {
 
 	timeout := timeoutSeconds
 	podWatcher, err := clientset.CoreV1().Pods(namespace).Watch(context.Background(), metav1.ListOptions{
-		TimeoutSeconds: &timeout,
-		LabelSelector:  "app.kubernetes.io/component,app.kubernetes.io/instance=" + run,
+		TimeoutSeconds:  &timeout,
+		ResourceVersion: "",
+		LabelSelector:   "app.kubernetes.io/component,app.kubernetes.io/instance=" + run,
 	})
 	if err != nil {
 		return nil, err
@@ -86,15 +87,15 @@ func updateFromPod(pod *v1.Pod, what watch.EventType, cc chan events.ComponentUp
 	switch component {
 	case string(events.WorkStealerComponent):
 		if what == watch.Added {
-			// new worker pod. start streaming its logs
+			// new workerstealer pod. start streaming its logs
 			if err := streamLogUpdatesForComponent(pod.Name, pod.Namespace, events.WorkStealerComponent, true, cm); err != nil {
 				return err
 			}
 		}
 		cc <- events.WorkStealerUpdate(pod.Namespace, "Kubernetes", workerStatus, what)
 	case string(events.DispatcherComponent):
 		if what == watch.Added {
-			// new worker pod. start streaming its logs
+			// new dispatcher pod. start streaming its logs
 			if err := streamLogUpdatesForComponent(pod.Name, pod.Namespace, events.DispatcherComponent, false, cm); err != nil {
 				return err
 			}