Match label and fields selectors in ComponentStatus List API

Godeps/LICENSES

@@ -2523,7 +2523,6 @@ THE SOFTWARE.
       of your accepting any such warranty or additional liability.
 
    END OF TERMS AND CONDITIONS
-
    APPENDIX: How to apply the Apache License to your work.
 
       To apply the Apache License to your work, attach the following
@@ -23461,4 +23460,3 @@ SOFTWARE.
 
 = vendor/vbom.ml/util/LICENSE 9f7e1d7e8f527330ebb5f4c32e0f3e40
 ================================================================================
-

pkg/registry/core/componentstatus/BUILD

@@ -20,9 +20,13 @@ go_library(
         "//pkg/probe/http:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/internalversion:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/fields:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/net:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/registry/generic:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/registry/rest:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/storage:go_default_library",
     ],
 )
 
@@ -36,7 +40,10 @@ go_test(
     deps = [
         "//pkg/apis/core:go_default_library",
         "//pkg/probe:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/internalversion:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/fields:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/diff:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/endpoints/request:go_default_library",
     ],

pkg/registry/core/componentstatus/rest.go

@@ -21,6 +21,11 @@ import (
 	"fmt"
 	"sync"
 
+	"k8s.io/apimachinery/pkg/fields"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apiserver/pkg/registry/generic"
+	"k8s.io/apiserver/pkg/storage"
+
 	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -70,13 +75,47 @@ func (rs *REST) List(ctx context.Context, options *metainternalversion.ListOptio
 	wait.Wait()
 	close(statuses)
 
+	pred := componentStatusPredicate(options)
+
 	reply := []api.ComponentStatus{}
 	for status := range statuses {
-		reply = append(reply, status)
+		// ComponentStatus resources currently (v1.14) do not support labeling, however the filtering is executed
+		// nonetheless in case the request contains Label or Field selectors (which will effectively filter out
+		// all of the results and return an empty response).
+		if matched := matchesPredicate(status, &pred); matched {
+			reply = append(reply, status)
+		}
 	}
 	return &api.ComponentStatusList{Items: reply}, nil
 }
 
+func componentStatusPredicate(options *metainternalversion.ListOptions) storage.SelectionPredicate {
+	pred := storage.SelectionPredicate{
+		Label:       labels.Everything(),
+		Field:       fields.Everything(),
+		GetAttrs:    nil,
+		IndexFields: []string{},
+	}
+	if options != nil {
+		if options.LabelSelector != nil {
+			pred.Label = options.LabelSelector
+		}
+		if options.FieldSelector != nil {
+			pred.Field = options.FieldSelector
+		}
+	}
+	return pred
+}
+
+func matchesPredicate(status api.ComponentStatus, pred *storage.SelectionPredicate) bool {
+	// currently no fields except the generic meta fields are supported for predicate matching
+	fieldsSet := generic.AddObjectMetaFieldsSet(make(fields.Set, 2), &status.ObjectMeta, true)
+	return pred.MatchesObjectAttributes(
+		status.ObjectMeta.Labels,
+		fieldsSet,
+	)
+}
+
 func (rs *REST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
 	servers := rs.GetServersToValidate()
 

pkg/registry/core/componentstatus/rest_test.go

@@ -22,6 +22,10 @@ import (
 	"strings"
 	"testing"
 
+	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
+	"k8s.io/apimachinery/pkg/fields"
+	"k8s.io/apimachinery/pkg/labels"
+
 	"net/http"
 	"net/url"
 	"time"
@@ -88,6 +92,44 @@ func TestList_NoError(t *testing.T) {
 	}
 }
 
+func TestList_WithLabelSelectors(t *testing.T) {
+	r := NewTestREST(testResponse{result: probe.Success, data: "ok"})
+	opts := metainternalversion.ListOptions{
+		LabelSelector: labels.SelectorFromSet(map[string]string{
+			"testLabel": "testValue",
+		}),
+	}
+	got, err := r.List(genericapirequest.NewContext(), &opts)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := &api.ComponentStatusList{
+		Items: []api.ComponentStatus{},
+	}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", diff.ObjectDiff(e, a))
+	}
+}
+
+func TestList_WithFieldSelectors(t *testing.T) {
+	r := NewTestREST(testResponse{result: probe.Success, data: "ok"})
+	opts := metainternalversion.ListOptions{
+		FieldSelector: fields.SelectorFromSet(map[string]string{
+			"testField": "testValue",
+		}),
+	}
+	got, err := r.List(genericapirequest.NewContext(), &opts)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := &api.ComponentStatusList{
+		Items: []api.ComponentStatus{},
+	}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", diff.ObjectDiff(e, a))
+	}
+}
+
 func TestList_FailedCheck(t *testing.T) {
 	r := NewTestREST(testResponse{result: probe.Failure, data: ""})
 	got, err := r.List(genericapirequest.NewContext(), nil)