Merge pull request #1438 from weaveworks/1430-filter-kube-system-containers

Filter out docker containers for pods in the kube-system namespace

render/container.go

@@ -31,16 +31,9 @@ var ContainerRenderer = MakeFilter(
 		return !ok || state != docker.StateDeleted
 	},
 	MakeReduce(
-		MakeFilter(
-			func(n report.Node) bool {
-				// Drop unconnected pseudo nodes (could appear due to filtering)
-				_, isConnected := n.Latest.Lookup(IsConnected)
-				return n.Topology != Pseudo || isConnected
-			},
-			MakeMap(
-				MapProcess2Container,
-				ProcessRenderer,
-			),
+		MakeMap(
+			MapProcess2Container,
+			ProcessRenderer,
 		),
 
 		// This mapper brings in short lived connections by joining with container IPs.

render/filters.go

@@ -95,7 +95,7 @@ func (f *Filter) render(rpt report.Report, dct Decorator) (report.Nodes, int) {
 	inDegrees := map[string]int{}
 	filtered := 0
 	for id, node := range f.Renderer.Render(rpt, dct) {
-		if f.FilterFunc(node) {
+		if node.Topology == Pseudo || f.FilterFunc(node) {
 			output[id] = node
 			inDegrees[id] = 0
 		} else {
@@ -150,17 +150,6 @@ func Complement(f FilterFunc) FilterFunc {
 	return func(node report.Node) bool { return !f(node) }
 }
 
-// FilterPseudo produces a renderer that removes pseudo nodes from the given
-// renderer
-func FilterPseudo(r Renderer) Renderer {
-	return MakeFilter(
-		func(node report.Node) bool {
-			return node.Topology != Pseudo
-		},
-		r,
-	)
-}
-
 // FilterUnconnected produces a renderer that filters unconnected nodes
 // from the given renderer
 func FilterUnconnected(r Renderer) Renderer {
@@ -228,7 +217,7 @@ func IsApplication(n report.Node) bool {
 	if roleLabel == "system" {
 		return false
 	}
-	namespace, _ := n.Latest.Lookup(kubernetes.Namespace)
+	namespace, _ := n.Latest.Lookup(docker.LabelPrefix + "io.kubernetes.pod.namespace")
 	if namespace == "kube-system" {
 		return false
 	}
@@ -262,9 +251,6 @@ func FilterEmpty(topology string, r Renderer) Renderer {
 // topology.
 func HasChildren(topology string) FilterFunc {
 	return func(n report.Node) bool {
-		if n.Topology == Pseudo {
-			return true
-		}
 		count := 0
 		n.Children.ForEach(func(child report.Node) {
 			if child.Topology == topology {
@@ -278,8 +264,8 @@ func HasChildren(topology string) FilterFunc {
 // IsNamespace checks if the node is a pod/service in the specified namespace
 func IsNamespace(namespace string) FilterFunc {
 	return func(n report.Node) bool {
-		gotNamespace, ok := n.Latest.Lookup(kubernetes.Namespace)
-		return !ok || namespace == gotNamespace
+		gotNamespace, _ := n.Latest.Lookup(kubernetes.Namespace)
+		return namespace == gotNamespace
 	}
 }
 

render/filters_test.go

@@ -124,18 +124,3 @@ func TestFilterUnconnectedSelf(t *testing.T) {
 		}
 	}
 }
-
-func TestFilterPseudo(t *testing.T) {
-	// Test pseudonodes are removed
-	{
-		nodes := report.Nodes{
-			"foo": report.MakeNode("foo"),
-			"bar": report.MakeNode("bar").WithTopology(render.Pseudo),
-		}
-		renderer := mockRenderer{Nodes: nodes}
-		have := renderer.Render(report.MakeReport(), render.FilterPseudo)
-		if _, ok := have["bar"]; ok {
-			t.Error("expected pseudonode to be removed")
-		}
-	}
-}

render/pod.go

@@ -27,16 +27,9 @@ var PodRenderer = ConditionalRenderer(renderKubernetesTopologies,
 			return (!ok || state != kubernetes.StateDeleted)
 		},
 		MakeReduce(
-			MakeFilter(
-				func(n report.Node) bool {
-					// Drop unconnected pseudo nodes (could appear due to filtering)
-					_, isConnected := n.Latest.Lookup(IsConnected)
-					return n.Topology != Pseudo || isConnected
-				},
-				ColorConnected(MakeMap(
-					MapContainer2Pod,
-					ContainerWithImageNameRenderer,
-				)),
+			MakeMap(
+				MapContainer2Pod,
+				ContainerWithImageNameRenderer,
 			),
 			SelectPod,
 		),

render/pod_test.go

@@ -3,7 +3,6 @@ package render_test
 import (
 	"testing"
 
-	"github.com/weaveworks/scope/probe/docker"
 	"github.com/weaveworks/scope/probe/kubernetes"
 	"github.com/weaveworks/scope/render"
 	"github.com/weaveworks/scope/render/expected"
@@ -20,22 +19,20 @@ func TestPodRenderer(t *testing.T) {
 	}
 }
 
+func filterNonKubeSystem(renderer render.Renderer) render.Renderer {
+	return render.MakeFilter(render.Complement(render.IsNamespace("kube-system")), renderer)
+}
+
 func TestPodFilterRenderer(t *testing.T) {
 	// tag on containers or pod namespace in the topology and ensure
 	// it is filtered out correctly.
 	input := fixture.Report.Copy()
 	input.Pod.Nodes[fixture.ClientPodNodeID] = input.Pod.Nodes[fixture.ClientPodNodeID].WithLatests(map[string]string{
-		kubernetes.PodID:     "kube-system/foo",
 		kubernetes.Namespace: "kube-system",
-		kubernetes.PodName:   "foo",
 	})
-	input.Container.Nodes[fixture.ClientContainerNodeID] = input.Container.Nodes[fixture.ClientContainerNodeID].WithLatests(map[string]string{
-		docker.LabelPrefix + "io.kubernetes.pod.name": "kube-system/foo",
-	})
-	have := Prune(render.PodRenderer.Render(input, render.FilterApplication))
+	have := Prune(render.PodRenderer.Render(input, filterNonKubeSystem))
 	want := Prune(expected.RenderedPods.Copy())
 	delete(want, fixture.ClientPodNodeID)
-	delete(want, fixture.ClientContainerNodeID)
 	if !reflect.DeepEqual(want, have) {
 		t.Error(test.Diff(want, have))
 	}
@@ -53,12 +50,13 @@ func TestPodServiceFilterRenderer(t *testing.T) {
 	// tag on containers or pod namespace in the topology and ensure
 	// it is filtered out correctly.
 	input := fixture.Report.Copy()
-	have := Prune(render.PodServiceRenderer.Render(input, render.FilterSystem))
+	input.Service.Nodes[fixture.ServiceNodeID] = input.Service.Nodes[fixture.ServiceNodeID].WithLatests(map[string]string{
+		kubernetes.Namespace: "kube-system",
+	})
+	have := Prune(render.PodServiceRenderer.Render(input, filterNonKubeSystem))
 	want := Prune(expected.RenderedPodServices.Copy())
 	delete(want, fixture.ServiceNodeID)
-	delete(want, expected.UnmanagedServerID)
 	delete(want, render.IncomingInternetID)
-	delete(want, render.OutgoingInternetID)
 	if !reflect.DeepEqual(want, have) {
 		t.Error(test.Diff(want, have))
 	}