*: support new MetricsGetter interface

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

cmd/adapter/adapter.go

@@ -32,8 +32,8 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	openapinamer "k8s.io/apiserver/pkg/endpoints/openapi"
 	genericapiserver "k8s.io/apiserver/pkg/server"
-	"k8s.io/client-go/informers"
+	"k8s.io/client-go/metadata"
-	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/metadata/metadatainformer"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/client-go/transport"
@@ -238,15 +238,15 @@ func (cmd *PrometheusAdapter) addResourceMetricsAPI(promClient prom.Client, stop
 		return err
 	}
 
-	client, err := kubernetes.NewForConfig(rest)
+	client, err := metadata.NewForConfig(rest)
 	if err != nil {
 		return err
 	}
 
-	podInformerFactory := informers.NewFilteredSharedInformerFactory(client, 0, corev1.NamespaceAll, func(options *metav1.ListOptions) {
+	podInformerFactory := metadatainformer.NewFilteredSharedInformerFactory(client, 0, corev1.NamespaceAll, func(options *metav1.ListOptions) {
 		options.FieldSelector = "status.phase=Running"
 	})
-	podInformer := podInformerFactory.Core().V1().Pods()
+	podInformer := podInformerFactory.ForResource(corev1.SchemeGroupVersion.WithResource("pods"))
 
 	informer, err := cmd.Informers()
 	if err != nil {

pkg/resourceprovider/provider.go

@@ -26,9 +26,9 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	apimeta "k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-	apitypes "k8s.io/apimachinery/pkg/types"
 	"k8s.io/klog/v2"
 	metrics "k8s.io/metrics/pkg/apis/metrics"
 
@@ -123,12 +123,11 @@ type nsQueryResults struct {
 }
 
 // GetPodMetrics implements the api.MetricsProvider interface.
-func (p *resourceProvider) GetPodMetrics(pods ...apitypes.NamespacedName) ([]api.TimeInfo, [][]metrics.ContainerMetrics, error) {
+func (p *resourceProvider) GetPodMetrics(pods ...*metav1.PartialObjectMetadata) ([]metrics.PodMetrics, error) {
-	resTimes := make([]api.TimeInfo, len(pods))
+	resMetrics := make([]metrics.PodMetrics, 0, len(pods))
-	resMetrics := make([][]metrics.ContainerMetrics, len(pods))
 
 	if len(pods) == 0 {
-		return resTimes, resMetrics, nil
+		return resMetrics, nil
 	}
 
 	// TODO(directxman12): figure out how well this scales if we go to list 1000+ pods
@@ -168,37 +167,40 @@ func (p *resourceProvider) GetPodMetrics(pods ...apitypes.NamespacedName) ([]api
 
 	// convert the unorganized per-container results into results grouped
 	// together by namespace, pod, and container
-	for i, pod := range pods {
+	for _, pod := range pods {
-		p.assignForPod(pod, resultsByNs, &resMetrics[i], &resTimes[i])
+		podMetric := p.assignForPod(pod, resultsByNs)
+		if podMetric != nil {
+			resMetrics = append(resMetrics, *podMetric)
+		}
 	}
 
-	return resTimes, resMetrics, nil
+	return resMetrics, nil
 }
 
 // assignForPod takes the resource metrics for all containers in the given pod
 // from resultsByNs, and places them in MetricsProvider response format in resMetrics,
 // also recording the earliest time in resTime.  It will return without operating if
 // any data is missing.
-func (p *resourceProvider) assignForPod(pod apitypes.NamespacedName, resultsByNs map[string]nsQueryResults, resMetrics *[]metrics.ContainerMetrics, resTime *api.TimeInfo) {
+func (p *resourceProvider) assignForPod(pod *metav1.PartialObjectMetadata, resultsByNs map[string]nsQueryResults) *metrics.PodMetrics {
 	// check to make sure everything is present
 	nsRes, nsResPresent := resultsByNs[pod.Namespace]
 	if !nsResPresent {
 		klog.Errorf("unable to fetch metrics for pods in namespace %q, skipping pod %s", pod.Namespace, pod.String())
-		return
+		return nil
 	}
 	cpuRes, hasResult := nsRes.cpu[pod.Name]
 	if !hasResult {
 		klog.Errorf("unable to fetch CPU metrics for pod %s, skipping", pod.String())
-		return
+		return nil
 	}
 	memRes, hasResult := nsRes.mem[pod.Name]
 	if !hasResult {
 		klog.Errorf("unable to fetch memory metrics for pod %s, skipping", pod.String())
-		return
+		return nil
 	}
 
-	earliestTs := pmodel.Latest
 	containerMetrics := make(map[string]metrics.ContainerMetrics)
+	earliestTs := pmodel.Latest
 
 	// organize all the CPU results
 	for _, cpu := range cpuRes {
@@ -241,40 +243,50 @@ func (p *resourceProvider) assignForPod(pod apitypes.NamespacedName, resultsByNs
 		}
 	}
 
+	podMetric := &metrics.PodMetrics{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:              pod.Name,
+			Namespace:         pod.Namespace,
+			Labels:            pod.Labels,
+			CreationTimestamp: metav1.Now(),
+		},
 		// store the time in the final format
-	*resTime = api.TimeInfo{
+		Timestamp: metav1.NewTime(earliestTs.Time()),
-		Timestamp: earliestTs.Time(),
+		Window:    metav1.Duration{Duration: p.window},
-		Window:    p.window,
 	}
 
 	// store the container metrics in the final format
-	containerMetricsList := make([]metrics.ContainerMetrics, 0, len(containerMetrics))
+	podMetric.Containers = make([]metrics.ContainerMetrics, 0, len(containerMetrics))
 	for _, containerMetric := range containerMetrics {
-		containerMetricsList = append(containerMetricsList, containerMetric)
+		podMetric.Containers = append(podMetric.Containers, containerMetric)
 	}
-	*resMetrics = containerMetricsList
+
+	return podMetric
 }
 
 // GetNodeMetrics implements the api.MetricsProvider interface.
-func (p *resourceProvider) GetNodeMetrics(nodes ...string) ([]api.TimeInfo, []corev1.ResourceList, error) {
+func (p *resourceProvider) GetNodeMetrics(nodes ...*corev1.Node) ([]metrics.NodeMetrics, error) {
-	resTimes := make([]api.TimeInfo, len(nodes))
+	resMetrics := make([]metrics.NodeMetrics, 0, len(nodes))
-	resMetrics := make([]corev1.ResourceList, len(nodes))
 
 	if len(nodes) == 0 {
-		return resTimes, resMetrics, nil
+		return resMetrics, nil
 	}
 
 	now := pmodel.Now()
+	nodeNames := make([]string, 0, len(nodes))
+	for _, node := range nodes {
+		nodeNames = append(nodeNames, node.Name)
+	}
 
 	// run the actual query
-	qRes := p.queryBoth(now, nodeResource, "", nodes...)
+	qRes := p.queryBoth(now, nodeResource, "", nodeNames...)
 	if qRes.err != nil {
 		klog.Errorf("failed querying node metrics: %v", qRes.err)
-		return resTimes, resMetrics, nil
+		return resMetrics, nil
 	}
 
 	// organize the results
-	for i, nodeName := range nodes {
+	for i, nodeName := range nodeNames {
 		// skip if any data is missing
 		rawCPUs, gotResult := qRes.cpu[nodeName]
 		if !gotResult {
@@ -290,28 +302,30 @@ func (p *resourceProvider) GetNodeMetrics(nodes ...string) ([]api.TimeInfo, []co
 		rawMem := rawMems[0]
 		rawCPU := rawCPUs[0]
 
-		// store the results
-		resMetrics[i] = corev1.ResourceList{
-			corev1.ResourceCPU:    *resource.NewMilliQuantity(int64(rawCPU.Value*1000.0), resource.DecimalSI),
-			corev1.ResourceMemory: *resource.NewMilliQuantity(int64(rawMem.Value*1000.0), resource.BinarySI),
-		}
-
 		// use the earliest timestamp available (in order to be conservative
 		// when determining if metrics are tainted by startup)
-		if rawMem.Timestamp.Before(rawCPU.Timestamp) {
+		ts := rawCPU.Timestamp.Time()
-			resTimes[i] = api.TimeInfo{
+		if ts.After(rawMem.Timestamp.Time()) {
-				Timestamp: rawMem.Timestamp.Time(),
+			ts = rawMem.Timestamp.Time()
-				Window:    p.window,
-			}
-		} else {
-			resTimes[i] = api.TimeInfo{
-				Timestamp: rawCPU.Timestamp.Time(),
-				Window:    1 * time.Minute,
-			}
-		}
 		}
 
-	return resTimes, resMetrics, nil
+		// store the results
+		resMetrics = append(resMetrics, metrics.NodeMetrics{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:              nodes[i].Name,
+				Labels:            nodes[i].Labels,
+				CreationTimestamp: metav1.Now(),
+			},
+			Usage: corev1.ResourceList{
+				corev1.ResourceCPU:    *resource.NewMilliQuantity(int64(rawCPU.Value*1000.0), resource.DecimalSI),
+				corev1.ResourceMemory: *resource.NewMilliQuantity(int64(rawMem.Value*1000.0), resource.BinarySI),
+			},
+			Timestamp: metav1.NewTime(ts),
+			Window:    metav1.Duration{Duration: p.window},
+		})
+	}
+
+	return resMetrics, nil
 }
 
 // queryBoth queries for both CPU and memory metrics on the given

pkg/resourceprovider/provider_test.go

@@ -23,9 +23,9 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	apimeta "k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/metrics/pkg/apis/metrics"
 
 	"sigs.k8s.io/metrics-server/pkg/api"
@@ -122,10 +122,10 @@ var _ = Describe("Resource Metrics Provider", func() {
 	})
 
 	It("should be able to list metrics pods across different namespaces", func() {
-		pods := []types.NamespacedName{
+		pods := []*metav1.PartialObjectMetadata{
-			{Namespace: "some-ns", Name: "pod1"},
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
-			{Namespace: "some-ns", Name: "pod3"},
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod3"}},
-			{Namespace: "other-ns", Name: "pod27"},
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "other-ns", Name: "pod27"}},
 		}
 		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
 			mustBuild(cpuQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod3")): buildQueryRes("container_cpu_usage_seconds_total",
@@ -149,28 +149,34 @@ var _ = Describe("Resource Metrics Provider", func() {
 		}
 
 		By("querying for metrics for some pods")
-		times, metricVals, err := prov.GetPodMetrics(pods...)
+		podMetrics, err := prov.GetPodMetrics(pods...)
 		Expect(err).NotTo(HaveOccurred())
 
+		By("verifying that metrics have been fetched for all the pods")
+		Expect(podMetrics).To(HaveLen(3))
+
 		By("verifying that the reported times for each are the earliest times for each pod")
-		Expect(times).To(Equal([]api.TimeInfo{
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+
-			{Timestamp: pmodel.Time(270).Time(), Window: 1 * time.Minute},
+		Expect(podMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-		}))
+		Expect(podMetrics[1].Window.Duration).To(Equal(time.Minute))
+
+		Expect(podMetrics[2].Timestamp.Time).To(Equal(pmodel.Time(270).Time()))
+		Expect(podMetrics[2].Window.Duration).To(Equal(time.Minute))
 
 		By("verifying that the right metrics were fetched")
-		Expect(metricVals).To(HaveLen(3))
+		Expect(podMetrics).To(HaveLen(3))
-		Expect(metricVals[0]).To(ConsistOf(
+		Expect(podMetrics[0].Containers).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1100.0, 3100.0)},
 			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1110.0, 3110.0)},
 		))
-		Expect(metricVals[1]).To(ConsistOf(
+		Expect(podMetrics[1].Containers).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1300.0, 3300.0)},
 			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1310.0, 3310.0)},
 		))
 
-		Expect(metricVals[2]).To(ConsistOf(
+		Expect(podMetrics[2].Containers).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(2200.0, 4200.0)},
 		))
 	})
@@ -188,23 +194,22 @@ var _ = Describe("Resource Metrics Provider", func() {
 		}
 
 		By("querying for metrics for some pods, one of which is missing")
-		times, metricVals, err := prov.GetPodMetrics(
+		podMetrics, err := prov.GetPodMetrics(
-			types.NamespacedName{Namespace: "some-ns", Name: "pod1"},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
-			types.NamespacedName{Namespace: "some-ns", Name: "pod-nonexistant"},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod-nonexistant"}},
 		)
 		Expect(err).NotTo(HaveOccurred())
 
-		By("verifying that the missing pod had nil metrics")
+		By("verifying that the missing pod had no metrics")
-		Expect(metricVals).To(HaveLen(2))
+		Expect(podMetrics).To(HaveLen(1))
-		Expect(metricVals[1]).To(BeNil())
 
 		By("verifying that the rest of time metrics and times are correct")
-		Expect(metricVals[0]).To(ConsistOf(
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(podMetrics[0].Containers).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1100.0, 3100.0)},
 			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1110.0, 3110.0)},
 		))
-		Expect(times).To(HaveLen(2))
-		Expect(times[0]).To(Equal(api.TimeInfo{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute}))
 	})
 
 	It("should return metrics of value zero when pod metrics have NaN or negative values", func() {
@@ -224,25 +229,27 @@ var _ = Describe("Resource Metrics Provider", func() {
 		}
 
 		By("querying for metrics for some pods")
-		times, metricVals, err := prov.GetPodMetrics(
+		podMetrics, err := prov.GetPodMetrics(
-			types.NamespacedName{Namespace: "some-ns", Name: "pod1"},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
-			types.NamespacedName{Namespace: "some-ns", Name: "pod3"},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod3"}},
 		)
 		Expect(err).NotTo(HaveOccurred())
 
+		By("verifying that metrics have been fetched for all the pods")
+		Expect(podMetrics).To(HaveLen(2))
+
 		By("verifying that the reported times for each are the earliest times for each pod")
-		Expect(times).To(Equal([]api.TimeInfo{
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+		Expect(podMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-		}))
+		Expect(podMetrics[1].Window.Duration).To(Equal(time.Minute))
 
 		By("verifying that NaN and negative values were replaced by zero")
-		Expect(metricVals).To(HaveLen(2))
+		Expect(podMetrics[0].Containers).To(ConsistOf(
-		Expect(metricVals[0]).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(0, 3100.0)},
 			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(0, 0)},
 		))
-		Expect(metricVals[1]).To(ConsistOf(
+		Expect(podMetrics[1].Containers).To(ConsistOf(
 			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(0, 0)},
 			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1310.0, 0)},
 		))
@@ -260,20 +267,24 @@ var _ = Describe("Resource Metrics Provider", func() {
 			),
 		}
 		By("querying for metrics for some nodes")
-		times, metricVals, err := prov.GetNodeMetrics("node1", "node2")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+		)
 		Expect(err).NotTo(HaveOccurred())
 
-		By("verifying that the reported times for each are the earliest times for each pod")
+		By("verifying that metrics have been fetched for all the nodes")
-		Expect(times).To(Equal([]api.TimeInfo{
+		Expect(nodeMetrics).To(HaveLen(2))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+
-			{Timestamp: pmodel.Time(12).Time(), Window: 1 * time.Minute},
+		By("verifying that the reported times for each are the earliest times for each node")
-		}))
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
 
 		By("verifying that the right metrics were fetched")
-		Expect(metricVals).To(Equal([]corev1.ResourceList{
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(1100.0, 2100.0)))
-			buildResList(1100.0, 2100.0),
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 2200.0)))
-			buildResList(1200.0, 2200.0),
-		}))
 	})
 
 	It("should return nil metrics for missing nodes, but still return partial results", func() {
@@ -288,24 +299,23 @@ var _ = Describe("Resource Metrics Provider", func() {
 			),
 		}
 		By("querying for metrics for some nodes, one of which is missing")
-		times, metricVals, err := prov.GetNodeMetrics("node1", "node2", "node3")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node3"}},
+		)
 		Expect(err).NotTo(HaveOccurred())
 
-		By("verifying that the missing pod had nil metrics")
+		By("verifying that the missing pod had no metrics")
-		Expect(metricVals).To(HaveLen(3))
+		Expect(nodeMetrics).To(HaveLen(2))
-		Expect(metricVals[2]).To(BeNil())
 
 		By("verifying that the rest of time metrics and times are correct")
-		Expect(metricVals).To(Equal([]corev1.ResourceList{
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(1100.0, 2100.0)))
-			buildResList(1100.0, 2100.0),
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-			buildResList(1200.0, 2200.0),
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
-			nil,
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 2200.0)))
-		}))
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
-		Expect(times).To(Equal([]api.TimeInfo{
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
-			{Timestamp: pmodel.Time(12).Time(), Window: 1 * time.Minute},
-			{},
-		}))
 	})
 
 	It("should return metrics of value zero when node metrics have NaN or negative values", func() {
@@ -320,19 +330,23 @@ var _ = Describe("Resource Metrics Provider", func() {
 			),
 		}
 		By("querying for metrics for some nodes")
-		times, metricVals, err := prov.GetNodeMetrics("node1", "node2")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+		)
 		Expect(err).NotTo(HaveOccurred())
 
+		By("verifying that metrics have been fetched for all the nodes")
+		Expect(nodeMetrics).To(HaveLen(2))
+
 		By("verifying that the reported times for each are the earliest times for each pod")
-		Expect(times).To(Equal([]api.TimeInfo{
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
-			{Timestamp: pmodel.Time(10).Time(), Window: 1 * time.Minute},
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
-			{Timestamp: pmodel.Time(12).Time(), Window: 1 * time.Minute},
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
-		}))
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
 
 		By("verifying that NaN and negative values were replaced by zero")
-		Expect(metricVals).To(Equal([]corev1.ResourceList{
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(0, 2100.0)))
-			buildResList(0, 2100.0),
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 0)))
-			buildResList(1200.0, 0),
-		}))
 	})
 })