Scale subresource querying in HorizontalPodAutoscaler

cmd/kube-controller-manager/app/controllermanager.go

@@ -272,7 +272,7 @@ func (s *CMServer) Run(_ []string) error {
 	// if err != nil {
 	// 	glog.Fatalf("Invalid API configuration: %v", err)
 	// }
-	// horizontalPodAutoscalerController := autoscalercontroller.New(expClient)
+	// horizontalPodAutoscalerController := autoscalercontroller.New(kubeClient, expClient)
 	// horizontalPodAutoscalerController.Run(s.NodeSyncPeriod)
 
 	select {}

pkg/client/unversioned/experimental.go

@@ -33,6 +33,7 @@ import (
 type ExperimentalInterface interface {
 	VersionInterface
 	HorizontalPodAutoscalersNamespacer
+	ScaleNamespacer
 }
 
 // ExperimentalClient is used to interact with experimental Kubernetes features.
@@ -75,6 +76,10 @@ func (c *ExperimentalClient) HorizontalPodAutoscalers(namespace string) Horizont
 	return newHorizontalPodAutoscalers(c, namespace)
 }
 
+func (c *ExperimentalClient) Scales(namespace string) ScaleInterface {
+	return newScales(c, namespace)
+}
+
 // NewExperimental creates a new ExperimentalClient for the given config. This client
 // provides access to experimental Kubernetes features.
 // Experimental features are not supported and may be changed or removed in

pkg/client/unversioned/scale.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package unversioned
+
+import (
+	"fmt"
+	"strings"
+
+	"k8s.io/kubernetes/pkg/expapi"
+)
+
+type ScaleNamespacer interface {
+	Scales(namespace string) ScaleInterface
+}
+
+// ScaleInterface has methods to work with Scale (sub)resources.
+type ScaleInterface interface {
+	Get(string, string) (*expapi.Scale, error)
+}
+
+// horizontalPodAutoscalers implements HorizontalPodAutoscalersNamespacer interface
+type scales struct {
+	client *ExperimentalClient
+	ns     string
+}
+
+// newHorizontalPodAutoscalers returns a horizontalPodAutoscalers
+func newScales(c *ExperimentalClient, namespace string) *scales {
+	return &scales{
+		client: c,
+		ns:     namespace,
+	}
+}
+
+// Get takes the reference to scale subresource and returns the subresource or error, if one occurs.
+func (c *scales) Get(kind string, name string) (result *expapi.Scale, err error) {
+	result = &expapi.Scale{}
+	if strings.ToLower(kind) == "replicationcontroller" {
+		kind = "replicationControllers"
+		err = c.client.Get().Namespace(c.ns).Resource(kind).Name(name).SubResource("scale").Do().Into(result)
+		return
+	}
+	err = fmt.Errorf("Kind not supported: %s", kind)
+	return
+}

pkg/controller/autoscaler/horizontalpodautoscaler_controller.go

@@ -18,23 +18,37 @@ package autoscalercontroller
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
-	"k8s.io/kubernetes/pkg/client/unversioned"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/fields"
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/util"
 )
 
+const (
+	heapsterNamespace = "kube-system"
+	heapsterService   = "monitoring-heapster"
+)
+
+var resourceToMetric = map[api.ResourceName]string{
+	api.ResourceCPU: "cpu-usage",
+}
+var heapsterQueryStart, _ = time.ParseDuration("-20m")
+
 type HorizontalPodAutoscalerController struct {
-	kubeClient unversioned.ExperimentalInterface
+	client    *client.Client
+	expClient client.ExperimentalInterface
 }
 
-func New(kubeClient unversioned.ExperimentalInterface) *HorizontalPodAutoscalerController {
+func New(client *client.Client, expClient client.ExperimentalInterface) *HorizontalPodAutoscalerController {
+	//TODO: switch to client.Interface
 	return &HorizontalPodAutoscalerController{
-		kubeClient: kubeClient,
+		client:    client,
+		expClient: expClient,
 	}
 }
 
@@ -48,11 +62,58 @@ func (a *HorizontalPodAutoscalerController) Run(syncPeriod time.Duration) {
 
 func (a *HorizontalPodAutoscalerController) reconcileAutoscalers() error {
 	ns := api.NamespaceAll
-	list, err := a.kubeClient.HorizontalPodAutoscalers(ns).List(labels.Everything(), fields.Everything())
+	list, err := a.expClient.HorizontalPodAutoscalers(ns).List(labels.Everything(), fields.Everything())
 	if err != nil {
 		return fmt.Errorf("error listing nodes: %v", err)
 	}
-	// TODO: implement!
+	for _, hpa := range list.Items {
-	glog.Info("autoscalers: %v", list)
+		reference := fmt.Sprintf("%s/%s/%s", hpa.Spec.ScaleRef.Kind, hpa.Spec.ScaleRef.Namespace, hpa.Spec.ScaleRef.Name)
+
+		scale, err := a.expClient.Scales(hpa.Spec.ScaleRef.Namespace).Get(hpa.Spec.ScaleRef.Kind, hpa.Spec.ScaleRef.Name)
+		if err != nil {
+			glog.Warningf("Failed to query scale subresource for %s: %v", reference, err)
+			continue
+		}
+		podList, err := a.client.Pods(hpa.Spec.ScaleRef.Namespace).
+			List(labels.SelectorFromSet(labels.Set(scale.Status.Selector)), fields.Everything())
+
+		if err != nil {
+			glog.Warningf("Failed to get pod list for %s: %v", reference, err)
+			continue
+		}
+		podNames := []string{}
+		for _, pod := range podList.Items {
+			podNames = append(podNames, pod.Name)
+		}
+
+		metric, metricDefined := resourceToMetric[hpa.Spec.Target.Resource]
+		if !metricDefined {
+			glog.Warningf("Heapster metric not defined for %s %v", reference, hpa.Spec.Target.Resource)
+			continue
+		}
+		startTime := time.Now().Add(heapsterQueryStart)
+		metricPath := fmt.Sprintf("/api/v1/model/namespaces/%s/pod-list/%s/metrics/%s",
+			hpa.Spec.ScaleRef.Namespace,
+			strings.Join(podNames, ","),
+			metric)
+
+		resultRaw, err := a.client.
+			Get().
+			Prefix("proxy").
+			Resource("services").
+			Namespace(heapsterNamespace).
+			Name(heapsterService).
+			Suffix(metricPath).
+			Param("start", startTime.Format(time.RFC3339)).
+			Do().
+			Raw()
+
+		if err != nil {
+			glog.Warningf("Failed to get pods metrics for %s: %v", reference, err)
+			continue
+		}
+
+		glog.Infof("Metrics available for %s: %s", reference, string(resultRaw))
+	}
 	return nil
 }

pkg/controller/autoscaler/horizontalpodautoscaler_controller_test.go

@@ -0,0 +1,154 @@
+/*
+Copyright 2014 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package autoscalercontroller
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"k8s.io/kubernetes/pkg/api"
+	_ "k8s.io/kubernetes/pkg/api/latest"
+	"k8s.io/kubernetes/pkg/api/resource"
+	"k8s.io/kubernetes/pkg/api/testapi"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/expapi"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util"
+
+	"github.com/golang/glog"
+)
+
+const (
+	namespace    = api.NamespaceDefault
+	rcName       = "app-rc"
+	podNameLabel = "app"
+	podName      = "p1"
+)
+
+var target = expapi.ResourceConsumption{Resource: api.ResourceCPU, Quantity: resource.MustParse("0.8")}
+
+type serverResponse struct {
+	statusCode int
+	obj        interface{}
+}
+
+func makeTestServer(t *testing.T, hpaResponse serverResponse,
+	scaleResponse serverResponse, podListResponse serverResponse,
+	heapsterResponse serverResponse) (*httptest.Server, []*util.FakeHandler) {
+
+	handlers := []*util.FakeHandler{}
+	mux := http.NewServeMux()
+
+	mkHandler := func(url string, response serverResponse) *util.FakeHandler {
+		handler := util.FakeHandler{
+			StatusCode:   response.statusCode,
+			ResponseBody: runtime.EncodeOrDie(testapi.Codec(), response.obj.(runtime.Object)),
+		}
+		mux.Handle(url, &handler)
+		glog.Infof("Will handle %s", url)
+		return &handler
+	}
+
+	mkRawHandler := func(url string, response serverResponse) *util.FakeHandler {
+		handler := util.FakeHandler{
+			StatusCode:   response.statusCode,
+			ResponseBody: *response.obj.(*string),
+		}
+		mux.Handle(url, &handler)
+		glog.Infof("Will handle %s", url)
+		return &handler
+	}
+
+	handlers = append(handlers, mkHandler("/experimental/v1/horizontalpodautoscalers", hpaResponse))
+	handlers = append(handlers, mkHandler(
+		fmt.Sprintf("/experimental/v1/namespaces/%s/replicationcontrollers/%s/scale", namespace, rcName), scaleResponse))
+	handlers = append(handlers, mkHandler(fmt.Sprintf("/api/v1/namespaces/%s/pods", namespace), podListResponse))
+	handlers = append(handlers, mkRawHandler(
+		fmt.Sprintf("/api/v1/proxy/namespaces/kube-system/services/monitoring-heapster/api/v1/model/namespaces/%s/pod-list/%s/metrics/cpu-usage",
+			namespace, podName), heapsterResponse))
+
+	mux.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
+		t.Errorf("unexpected request: %v", req.RequestURI)
+		res.WriteHeader(http.StatusNotFound)
+	})
+	return httptest.NewServer(mux), handlers
+}
+
+func TestSyncEndpointsItemsPreserveNoSelector(t *testing.T) {
+
+	hpaResponse := serverResponse{http.StatusOK, &expapi.HorizontalPodAutoscalerList{
+		Items: []expapi.HorizontalPodAutoscaler{
+			{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "foo",
+					Namespace: namespace,
+				},
+				Spec: expapi.HorizontalPodAutoscalerSpec{
+					ScaleRef: &expapi.SubresourceReference{
+						Kind:        "replicationController",
+						Name:        rcName,
+						Namespace:   namespace,
+						Subresource: "scale",
+					},
+					MinCount: 1,
+					MaxCount: 5,
+					Target:   target,
+				},
+			}}}}
+
+	scaleResponse := serverResponse{http.StatusOK, &expapi.Scale{
+		ObjectMeta: api.ObjectMeta{
+			Name:      "rcName",
+			Namespace: namespace,
+		},
+		Spec: expapi.ScaleSpec{
+			Replicas: 5,
+		},
+		Status: expapi.ScaleStatus{
+			Replicas: 2,
+			Selector: map[string]string{"name": podNameLabel},
+		},
+	}}
+
+	podListResponse := serverResponse{http.StatusOK, &api.PodList{
+		Items: []api.Pod{
+			{
+				ObjectMeta: api.ObjectMeta{
+					Name:      podName,
+					Namespace: namespace,
+				},
+			}}}}
+
+	heapsterRawResponse := "UPADTE ME"
+	heapsterResponse := serverResponse{http.StatusOK, &heapsterRawResponse}
+
+	testServer, handlers := makeTestServer(t, hpaResponse, scaleResponse, podListResponse, heapsterResponse)
+	defer testServer.Close()
+	kubeClient := client.NewOrDie(&client.Config{Host: testServer.URL, Version: testapi.Version()})
+	expClient := client.NewExperimentalOrDie(&client.Config{Host: testServer.URL, Version: testapi.Version()})
+
+	hpaController := New(kubeClient, expClient)
+	err := hpaController.reconcileAutoscalers()
+	if err != nil {
+		t.Fatal("Failed to reconcile %v", err)
+	}
+	for _, h := range handlers {
+		h.ValidateRequestCount(t, 1)
+	}
+}