added support of multiple namespaces (#167)

cli/kubernetes/watch.go

@@ -4,49 +4,64 @@ import (
 	"context"
 	"errors"
 	"regexp"
+	"sync"
 
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/watch"
 )
 
-func FilteredWatch(ctx context.Context, watcher watch.Interface, podFilter *regexp.Regexp) (chan *corev1.Pod, chan *corev1.Pod, chan *corev1.Pod, chan error) {
+func FilteredWatch(ctx context.Context, kubernetesProvider *Provider, targetNamespaces []string, podFilter *regexp.Regexp) (chan *corev1.Pod, chan *corev1.Pod, chan *corev1.Pod, chan error) {
 	addedChan := make(chan *corev1.Pod)
 	modifiedChan := make(chan *corev1.Pod)
 	removedChan := make(chan *corev1.Pod)
 	errorChan := make(chan error)
-	go func() {
-		for {
-			select {
-			case e := <-watcher.ResultChan():
 
-				if e.Object == nil {
-					errorChan <- errors.New("kubernetes pod watch failed")
+	var wg sync.WaitGroup
+
+	for _, targetNamespace := range targetNamespaces {
+		wg.Add(1)
+
+		go func(targetNamespace string) {
+			defer wg.Done()
+			watcher := kubernetesProvider.GetPodWatcher(ctx, targetNamespace)
+
+			for {
+				select {
+				case e := <-watcher.ResultChan():
+					if e.Object == nil {
+						errorChan <- errors.New("kubernetes pod watch failed")
+						return
+					}
+
+					pod := e.Object.(*corev1.Pod)
+
+					if !podFilter.MatchString(pod.Name) {
+						continue
+					}
+
+					switch e.Type {
+					case watch.Added:
+						addedChan <- pod
+					case watch.Modified:
+						modifiedChan <- pod
+					case watch.Deleted:
+						removedChan <- pod
+					}
+				case <-ctx.Done():
+					watcher.Stop()
 					return
 				}
-
-				pod := e.Object.(*corev1.Pod)
-
-				if !podFilter.MatchString(pod.Name) {
-					continue
-				}
-
-				switch e.Type {
-				case watch.Added:
-					addedChan <- pod
-				case watch.Modified:
-					modifiedChan <- pod
-				case watch.Deleted:
-					removedChan <- pod
-				}
-			case <-ctx.Done():
-				watcher.Stop()
-				close(addedChan)
-				close(modifiedChan)
-				close(removedChan)
-				close(errorChan)
-				return
 			}
-		}
+		}(targetNamespace)
+	}
+
+	go func() {
+		<-ctx.Done()
+		wg.Wait()
+		close(addedChan)
+		close(modifiedChan)
+		close(removedChan)
+		close(errorChan)
 	}()
 
 	return addedChan, modifiedChan, removedChan, errorChan