Added annotation that InitialResources set request

plugin/pkg/admission/initialresources/admission.go

@@ -36,9 +36,10 @@ var (
 )
 
 const (
-	samplesThreshold = 60
-	week             = 7 * 24 * time.Hour
-	month            = 30 * 24 * time.Hour
+	initialResourcesAnnotation = "kubernetes.io/initial-resources"
+	samplesThreshold           = 60
+	week                       = 7 * 24 * time.Hour
+	month                      = 30 * 24 * time.Hour
 )
 
 // WARNING: this feature is experimental and will definitely change.
@@ -81,6 +82,7 @@ func (ir initialResources) Admit(a admission.Attributes) (err error) {
 // The method veryfies whether resources should be set for the given pod and
 // if there is estimation available the method fills Request field.
 func (ir initialResources) estimateAndFillResourcesIfNotSet(pod *api.Pod) {
+	annotations := []string{}
 	for i := range pod.Spec.Containers {
 		c := &pod.Spec.Containers[i]
 		req := c.Resources.Requests
@@ -109,16 +111,29 @@ func (ir initialResources) estimateAndFillResourcesIfNotSet(pod *api.Pod) {
 			c.Resources.Requests = api.ResourceList{}
 			req = c.Resources.Requests
 		}
+		setRes := []string{}
 		if cpu != nil {
 			glog.Infof("CPU estimation for container %v in pod %v/%v is %v", c.Name, pod.ObjectMeta.Namespace, pod.ObjectMeta.Name, cpu.String())
+			setRes = append(setRes, string(api.ResourceCPU))
 			req[api.ResourceCPU] = *cpu
 		}
 		if mem != nil {
 			glog.Infof("Memory estimation for container %v in pod  %v/%v is %v", c.Name, pod.ObjectMeta.Namespace, pod.ObjectMeta.Name, mem.String())
+			setRes = append(setRes, string(api.ResourceMemory))
 			req[api.ResourceMemory] = *mem
 		}
+		if len(setRes) > 0 {
+			a := strings.Join(setRes, ", ") + " request for container " + c.Name
+			annotations = append(annotations, a)
+		}
+	}
+	if len(annotations) > 0 {
+		if pod.ObjectMeta.Annotations == nil {
+			pod.ObjectMeta.Annotations = make(map[string]string)
+		}
+		val := "Initial Resources plugin set: " + strings.Join(annotations, "; ")
+		pod.ObjectMeta.Annotations[initialResourcesAnnotation] = val
 	}
-	// TODO(piosz): verify the estimates fits in LimitRanger
 }
 
 func (ir initialResources) getEstimation(kind api.ResourceName, c *api.Container) (*resource.Quantity, error) {

plugin/pkg/admission/initialresources/admission_test.go

@@ -55,18 +55,18 @@ func addContainer(pod *api.Pod, name, image string, request api.ResourceList) {
 	})
 }
 
-func createPod(name string, image string, request api.ResourceList) api.Pod {
-	pod := api.Pod{
+func createPod(name string, image string, request api.ResourceList) *api.Pod {
+	pod := &api.Pod{
 		ObjectMeta: api.ObjectMeta{Name: name, Namespace: "test"},
 		Spec:       api.PodSpec{},
 	}
 	pod.Spec.Containers = []api.Container{}
-	addContainer(&pod, "c0", image, request)
+	addContainer(pod, "c0", image, request)
 	return pod
 }
 
-func getPods() []api.Pod {
-	return []api.Pod{
+func getPods() []*api.Pod {
+	return []*api.Pod{
 		createPod("p0", "image:v0", parseReq("", "")),
 		createPod("p1", "image:v1", parseReq("", "300")),
 		createPod("p2", "image:v2", parseReq("300m", "")),
@@ -88,9 +88,25 @@ func verifyPod(t *testing.T, pod *api.Pod, cpu, mem int64) {
 	verifyContainer(t, &pod.Spec.Containers[0], cpu, mem)
 }
 
-func admit(t *testing.T, ir admission.Interface, pods []api.Pod) {
+func verifyAnnotation(t *testing.T, pod *api.Pod, expected string) {
+	a, ok := pod.ObjectMeta.Annotations[initialResourcesAnnotation]
+	if !ok {
+		t.Errorf("No annotation but expected %v", expected)
+	}
+	if a != expected {
+		t.Errorf("Wrong annatation set by Initial Resources: got %v, expected %v", a, expected)
+	}
+}
+
+func expectNoAnnotation(t *testing.T, pod *api.Pod) {
+	if a, ok := pod.ObjectMeta.Annotations[initialResourcesAnnotation]; ok {
+		t.Errorf("Expected no annatation but got %v", a)
+	}
+}
+
+func admit(t *testing.T, ir admission.Interface, pods []*api.Pod) {
 	for i := range pods {
-		p := &pods[i]
+		p := pods[i]
 		if err := ir.Admit(admission.NewAttributesRecord(p, "Pod", "test", p.ObjectMeta.Name, "pods", "", admission.Create, nil)); err != nil {
 			t.Error(err)
 		}
@@ -109,10 +125,15 @@ func TestEstimationBasedOnTheSameImage7d(t *testing.T) {
 	pods := getPods()
 	admit(t, ir, pods)
 
-	verifyPod(t, &pods[0], 100, 100)
-	verifyPod(t, &pods[1], 100, 300)
-	verifyPod(t, &pods[2], 300, 100)
-	verifyPod(t, &pods[3], 300, 300)
+	verifyPod(t, pods[0], 100, 100)
+	verifyPod(t, pods[1], 100, 300)
+	verifyPod(t, pods[2], 300, 100)
+	verifyPod(t, pods[3], 300, 300)
+
+	verifyAnnotation(t, pods[0], "Initial Resources plugin set: cpu, memory request for container c0")
+	verifyAnnotation(t, pods[1], "Initial Resources plugin set: cpu request for container c0")
+	verifyAnnotation(t, pods[2], "Initial Resources plugin set: memory request for container c0")
+	expectNoAnnotation(t, pods[3])
 }
 
 func TestEstimationBasedOnTheSameImage30d(t *testing.T) {
@@ -130,10 +151,10 @@ func TestEstimationBasedOnTheSameImage30d(t *testing.T) {
 	pods := getPods()
 	admit(t, ir, pods)
 
-	verifyPod(t, &pods[0], 100, 100)
-	verifyPod(t, &pods[1], 100, 300)
-	verifyPod(t, &pods[2], 300, 100)
-	verifyPod(t, &pods[3], 300, 300)
+	verifyPod(t, pods[0], 100, 100)
+	verifyPod(t, pods[1], 100, 300)
+	verifyPod(t, pods[2], 300, 100)
+	verifyPod(t, pods[3], 300, 300)
 }
 
 func TestEstimationBasedOnOtherImages(t *testing.T) {
@@ -148,10 +169,10 @@ func TestEstimationBasedOnOtherImages(t *testing.T) {
 	pods := getPods()
 	admit(t, ir, pods)
 
-	verifyPod(t, &pods[0], 100, 100)
-	verifyPod(t, &pods[1], 100, 300)
-	verifyPod(t, &pods[2], 300, 100)
-	verifyPod(t, &pods[3], 300, 300)
+	verifyPod(t, pods[0], 100, 100)
+	verifyPod(t, pods[1], 100, 300)
+	verifyPod(t, pods[2], 300, 100)
+	verifyPod(t, pods[3], 300, 300)
 }
 
 func TestNoData(t *testing.T) {
@@ -160,7 +181,7 @@ func TestNoData(t *testing.T) {
 	}
 	ir := newInitialResources(&fakeSource{f: f})
 
-	pods := []api.Pod{
+	pods := []*api.Pod{
 		createPod("p0", "image:v0", parseReq("", "")),
 	}
 	admit(t, ir, pods)
@@ -168,6 +189,8 @@ func TestNoData(t *testing.T) {
 	if pods[0].Spec.Containers[0].Resources.Requests != nil {
 		t.Errorf("Unexpected resource estimation")
 	}
+
+	expectNoAnnotation(t, pods[0])
 }
 
 func TestManyContainers(t *testing.T) {
@@ -180,13 +203,15 @@ func TestManyContainers(t *testing.T) {
 	ir := newInitialResources(&fakeSource{f: f})
 
 	pod := createPod("p", "image:v0", parseReq("", ""))
-	addContainer(&pod, "c1", "image:v1", parseReq("", "300"))
-	addContainer(&pod, "c2", "image:v2", parseReq("300m", ""))
-	addContainer(&pod, "c3", "image:v3", parseReq("300m", "300"))
-	admit(t, ir, []api.Pod{pod})
+	addContainer(pod, "c1", "image:v1", parseReq("", "300"))
+	addContainer(pod, "c2", "image:v2", parseReq("300m", ""))
+	addContainer(pod, "c3", "image:v3", parseReq("300m", "300"))
+	admit(t, ir, []*api.Pod{pod})
 
 	verifyContainer(t, &pod.Spec.Containers[0], 100, 100)
 	verifyContainer(t, &pod.Spec.Containers[1], 100, 300)
 	verifyContainer(t, &pod.Spec.Containers[2], 300, 100)
 	verifyContainer(t, &pod.Spec.Containers[3], 300, 300)
+
+	verifyAnnotation(t, pod, "Initial Resources plugin set: cpu, memory request for container c0; cpu request for container c1; memory request for container c2")
 }