*: 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/kubernetes"
+	"k8s.io/client-go/metadata"
+	"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) {
-	resTimes := make([]api.TimeInfo, len(pods))
-	resMetrics := make([][]metrics.ContainerMetrics, len(pods))
+func (p *resourceProvider) GetPodMetrics(pods ...*metav1.PartialObjectMetadata) ([]metrics.PodMetrics, error) {
+	resMetrics := make([]metrics.PodMetrics, 0, 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 {
-		p.assignForPod(pod, resultsByNs, &resMetrics[i], &resTimes[i])
+	for _, pod := range pods {
+		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
 		}
 	}
 
-	// store the time in the final format
-	*resTime = api.TimeInfo{
-		Timestamp: earliestTs.Time(),
-		Window:    p.window,
+	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
+		Timestamp: metav1.NewTime(earliestTs.Time()),
+		Window:    metav1.Duration{Duration: 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) {
-	resTimes := make([]api.TimeInfo, len(nodes))
-	resMetrics := make([]corev1.ResourceList, len(nodes))
+func (p *resourceProvider) GetNodeMetrics(nodes ...*corev1.Node) ([]metrics.NodeMetrics, error) {
+	resMetrics := make([]metrics.NodeMetrics, 0, 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) {
-			resTimes[i] = api.TimeInfo{
-				Timestamp: rawMem.Timestamp.Time(),
-				Window:    p.window,
-			}
-		} else {
-			resTimes[i] = api.TimeInfo{
-				Timestamp: rawCPU.Timestamp.Time(),
-				Window:    1 * time.Minute,
-			}
+		ts := rawCPU.Timestamp.Time()
+		if ts.After(rawMem.Timestamp.Time()) {
+			ts = rawMem.Timestamp.Time()
 		}
+
+		// 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 resTimes, resMetrics, nil
+	return resMetrics, nil
 }
 
 // queryBoth queries for both CPU and memory metrics on the given