Unittests for horizontal pod autoscaler controller.

pkg/client/unversioned/testclient/fake_services.go

@@ -77,6 +77,5 @@ func (c *FakeServices) Watch(label labels.Selector, field fields.Selector, resou
 }
 
 func (c *FakeServices) ProxyGet(name, path string, params map[string]string) unversioned.ResponseWrapper {
-	c.Fake.Invokes(NewProxyGetAction("services", c.Namespace, name, path, params), nil)
-	return nil
+	return c.Fake.InvokesProxy(NewProxyGetAction("services", c.Namespace, name, path, params))
 }

pkg/client/unversioned/testclient/fixture.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/meta"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util/yaml"
 	"k8s.io/kubernetes/pkg/watch"
@@ -260,7 +261,7 @@ func (r *SimpleReactor) React(action Action) (bool, runtime.Object, error) {
 	return r.Reaction(action)
 }
 
-// SimpleWatchReactor is a Reactor.  Each reaction function is attached to a given verb,resource tuple.  "*" in either field matches everything for that value.
+// SimpleWatchReactor is a WatchReactor.  Each reaction function is attached to a given resource.  "*" matches everything for that value.
 // For instance, *,pods matches all verbs on pods.  This allows for easier composition of reaction functions
 type SimpleWatchReactor struct {
 	Resource string
@@ -280,3 +281,24 @@ func (r *SimpleWatchReactor) Handles(action Action) bool {
 func (r *SimpleWatchReactor) React(action Action) (bool, watch.Interface, error) {
 	return r.Reaction(action)
 }
+
+// SimpleProxyReactor is a ProxyReactor.  Each reaction function is attached to a given resource.  "*" matches everything for that value.
+// For instance, *,pods matches all verbs on pods.  This allows for easier composition of reaction functions.
+type SimpleProxyReactor struct {
+	Resource string
+
+	Reaction ProxyReactionFunc
+}
+
+func (r *SimpleProxyReactor) Handles(action Action) bool {
+	resourceCovers := r.Resource == "*" || r.Resource == action.GetResource()
+	if !resourceCovers {
+		return false
+	}
+
+	return true
+}
+
+func (r *SimpleProxyReactor) React(action Action) (bool, client.ResponseWrapper, error) {
+	return r.Reaction(action)
+}

pkg/client/unversioned/testclient/testclient.go

@@ -54,6 +54,8 @@ type Fake struct {
 	ReactionChain []Reactor
 	// WatchReactionChain is the list of watch reactors that will be attempted for every request in the order they are tried
 	WatchReactionChain []WatchReactor
+	// ProxyReactionChain is the list of proxy reactors that will be attempted for every request in the order they are tried
+	ProxyReactionChain []ProxyReactor
 }
 
 // Reactor is an interface to allow the composition of reaction functions.
@@ -72,6 +74,14 @@ type WatchReactor interface {
 	React(action Action) (handled bool, ret watch.Interface, err error)
 }
 
+// ProxyReactor is an interface to allow the composition of proxy get functions.
+type ProxyReactor interface {
+	// Handles indicates whether or not this Reactor deals with a given action
+	Handles(action Action) bool
+	// React handles a watch action and returns results.  It may choose to delegate by indicated handled=false
+	React(action Action) (handled bool, ret client.ResponseWrapper, err error)
+}
+
 // ReactionFunc is a function that returns an object or error for a given Action.  If "handled" is false,
 // then the test client will continue ignore the results and continue to the next ReactionFunc
 type ReactionFunc func(action Action) (handled bool, ret runtime.Object, err error)
@@ -80,6 +90,10 @@ type ReactionFunc func(action Action) (handled bool, ret runtime.Object, err err
 // then the test client will continue ignore the results and continue to the next ReactionFunc
 type WatchReactionFunc func(action Action) (handled bool, ret watch.Interface, err error)
 
+// ProxyReactionFunc is a function that returns a ResponseWrapper interface for a given Action.  If "handled" is false,
+// then the test client will continue ignore the results and continue to the next ProxyReactionFunc
+type ProxyReactionFunc func(action Action) (handled bool, ret client.ResponseWrapper, err error)
+
 // AddReactor appends a reactor to the end of the chain
 func (c *Fake) AddReactor(verb, resource string, reaction ReactionFunc) {
 	c.ReactionChain = append(c.ReactionChain, &SimpleReactor{verb, resource, reaction})
@@ -97,6 +111,11 @@ func (c *Fake) AddWatchReactor(resource string, reaction WatchReactionFunc) {
 	c.WatchReactionChain = append(c.WatchReactionChain, &SimpleWatchReactor{resource, reaction})
 }
 
+// AddProxyReactor appends a reactor to the end of the chain
+func (c *Fake) AddProxyReactor(resource string, reaction ProxyReactionFunc) {
+	c.ProxyReactionChain = append(c.ProxyReactionChain, &SimpleProxyReactor{resource, reaction})
+}
+
 // Invokes records the provided Action and then invokes the ReactFn (if provided).
 // defaultReturnObj is expected to be of the same type a normal call would return.
 func (c *Fake) Invokes(action Action, defaultReturnObj runtime.Object) (runtime.Object, error) {
@@ -142,6 +161,28 @@ func (c *Fake) InvokesWatch(action Action) (watch.Interface, error) {
 	return nil, fmt.Errorf("unhandled watch: %#v", action)
 }
 
+// InvokesProxy records the provided Action and then invokes the ReactFn (if provided).
+func (c *Fake) InvokesProxy(action Action) client.ResponseWrapper {
+	c.Lock()
+	defer c.Unlock()
+
+	c.actions = append(c.actions, action)
+	for _, reactor := range c.ProxyReactionChain {
+		if !reactor.Handles(action) {
+			continue
+		}
+
+		handled, ret, err := reactor.React(action)
+		if !handled || err != nil {
+			continue
+		}
+
+		return ret
+	}
+
+	return nil
+}
+
 // ClearActions clears the history of actions called on the fake client
 func (c *Fake) ClearActions() {
 	c.Lock()

pkg/controller/podautoscaler/horizontal.go

@@ -79,8 +79,9 @@ func (a *HorizontalController) reconcileAutoscaler(hpa experimental.HorizontalPo
 		return fmt.Errorf("failed to query scale subresource for %s: %v", reference, err)
 	}
 	currentReplicas := scale.Status.Replicas
-	currentConsumption, err := a.metricsClient.ResourceConsumption(hpa.Spec.ScaleRef.Namespace).Get(hpa.Spec.Target.Resource,
-		scale.Status.Selector)
+	currentConsumption, err := a.metricsClient.
+		ResourceConsumption(hpa.Spec.ScaleRef.Namespace).
+		Get(hpa.Spec.Target.Resource, scale.Status.Selector)
 
 	// TODO: what to do on partial errors (like metrics obtained for 75% of pods).
 	if err != nil {