Merge pull request kubernetes#53164 from enisoc/rc-rs-conversion

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix RC/RS conversion

This fixes some round-trip information loss when representing an RC as an RS. I want to use these conversions in kubernetes#49429 to eliminate the maintenance burden of duplicated RC code.

@kubernetes/sig-apps-pr-reviews

Author: Kubernetes Submit Queue

hack/.golint_failures

@@ -541,7 +541,6 @@ staging/src/k8s.io/apimachinery/pkg/apimachinery/announced
 staging/src/k8s.io/apimachinery/pkg/apimachinery/registered
 staging/src/k8s.io/apimachinery/pkg/apis/meta/fuzzer
 staging/src/k8s.io/apimachinery/pkg/apis/meta/internalversion
-staging/src/k8s.io/apimachinery/pkg/apis/meta/v1
 staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured
 staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/validation
 staging/src/k8s.io/apimachinery/pkg/apis/meta/v1alpha1

pkg/api/v1/BUILD

@@ -46,9 +46,14 @@ go_test(
         "//pkg/api:go_default_library",
         "//pkg/api/legacyscheme:go_default_library",
         "//pkg/api/testapi:go_default_library",
+        "//pkg/api/testing:go_default_library",
+        "//pkg/apis/extensions:go_default_library",
+        "//pkg/util/pointer:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/api/extensions/v1beta1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/resource:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/testing/fuzzer:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/util/diff:go_default_library",

pkg/api/v1/conversion.go

@@ -235,7 +235,9 @@ func Convert_v1_ReplicationController_to_extensions_ReplicaSet(in *v1.Replicatio
 
 func Convert_v1_ReplicationControllerSpec_to_extensions_ReplicaSetSpec(in *v1.ReplicationControllerSpec, out *extensions.ReplicaSetSpec, s conversion.Scope) error {
 	out.Replicas = *in.Replicas
+	out.MinReadySeconds = in.MinReadySeconds
 	if in.Selector != nil {
+		out.Selector = new(metav1.LabelSelector)
 		metav1.Convert_map_to_unversioned_LabelSelector(&in.Selector, out.Selector, s)
 	}
 	if in.Template != nil {
@@ -252,6 +254,15 @@ func Convert_v1_ReplicationControllerStatus_to_extensions_ReplicaSetStatus(in *v
 	out.ReadyReplicas = in.ReadyReplicas
 	out.AvailableReplicas = in.AvailableReplicas
 	out.ObservedGeneration = in.ObservedGeneration
+	for _, cond := range in.Conditions {
+		out.Conditions = append(out.Conditions, extensions.ReplicaSetCondition{
+			Type:               extensions.ReplicaSetConditionType(cond.Type),
+			Status:             api.ConditionStatus(cond.Status),
+			LastTransitionTime: cond.LastTransitionTime,
+			Reason:             cond.Reason,
+			Message:            cond.Message,
+		})
+	}
 	return nil
 }
 
@@ -294,6 +305,15 @@ func Convert_extensions_ReplicaSetStatus_to_v1_ReplicationControllerStatus(in *e
 	out.ReadyReplicas = in.ReadyReplicas
 	out.AvailableReplicas = in.AvailableReplicas
 	out.ObservedGeneration = in.ObservedGeneration
+	for _, cond := range in.Conditions {
+		out.Conditions = append(out.Conditions, v1.ReplicationControllerCondition{
+			Type:               v1.ReplicationControllerConditionType(cond.Type),
+			Status:             v1.ConditionStatus(cond.Status),
+			LastTransitionTime: cond.LastTransitionTime,
+			Reason:             cond.Reason,
+			Message:            cond.Message,
+		})
+	}
 	return nil
 }
 

pkg/api/v1/conversion_test.go

@@ -17,20 +17,27 @@ limitations under the License.
 package v1_test
 
 import (
+	"encoding/json"
+	"math/rand"
 	"net/url"
 	"reflect"
 	"testing"
 	"time"
 
 	"k8s.io/api/core/v1"
+	extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/api/resource"
+	"k8s.io/apimachinery/pkg/api/testing/fuzzer"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/util/diff"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
+	kapitesting "k8s.io/kubernetes/pkg/api/testing"
 	k8s_api_v1 "k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+	utilpointer "k8s.io/kubernetes/pkg/util/pointer"
 
 	// enforce that all types are installed
 	_ "k8s.io/kubernetes/pkg/api/testapi"
@@ -226,3 +233,115 @@ func TestResourceListConversion(t *testing.T) {
 		}
 	}
 }
+
+func TestReplicationControllerConversion(t *testing.T) {
+	// If we start with a RC, we should always have round-trip fidelity.
+	inputs := []*v1.ReplicationController{
+		{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "name",
+				Namespace: "namespace",
+			},
+			Spec: v1.ReplicationControllerSpec{
+				Replicas:        utilpointer.Int32Ptr(1),
+				MinReadySeconds: 32,
+				Selector:        map[string]string{"foo": "bar", "bar": "foo"},
+				Template: &v1.PodTemplateSpec{
+					ObjectMeta: metav1.ObjectMeta{
+						Labels: map[string]string{"foo": "bar", "bar": "foo"},
+					},
+					Spec: v1.PodSpec{
+						Containers: []v1.Container{
+							{
+								Name:  "container",
+								Image: "image",
+							},
+						},
+					},
+				},
+			},
+			Status: v1.ReplicationControllerStatus{
+				Replicas:             1,
+				FullyLabeledReplicas: 2,
+				ReadyReplicas:        3,
+				AvailableReplicas:    4,
+				ObservedGeneration:   5,
+				Conditions: []v1.ReplicationControllerCondition{
+					{
+						Type:               v1.ReplicationControllerReplicaFailure,
+						Status:             v1.ConditionTrue,
+						LastTransitionTime: metav1.NewTime(time.Unix(123456789, 0)),
+						Reason:             "Reason",
+						Message:            "Message",
+					},
+				},
+			},
+		},
+	}
+
+	// Add some fuzzed RCs.
+	apiObjectFuzzer := fuzzer.FuzzerFor(kapitesting.FuzzerFuncs, rand.NewSource(152), legacyscheme.Codecs)
+	for i := 0; i < 100; i++ {
+		rc := &v1.ReplicationController{}
+		apiObjectFuzzer.Fuzz(rc)
+		// Sometimes the fuzzer decides to leave Spec.Template nil.
+		// We can't support that because Spec.Template is not a pointer in RS,
+		// so it will round-trip as non-nil but empty.
+		if rc.Spec.Template == nil {
+			rc.Spec.Template = &v1.PodTemplateSpec{}
+		}
+		// Sometimes the fuzzer decides to insert an empty label key.
+		// This doesn't round-trip properly because it's invalid.
+		if rc.Spec.Selector != nil {
+			delete(rc.Spec.Selector, "")
+		}
+		inputs = append(inputs, rc)
+	}
+
+	// Round-trip the input RCs before converting to RS.
+	for i := range inputs {
+		inputs[i] = roundTrip(t, inputs[i]).(*v1.ReplicationController)
+	}
+
+	for _, in := range inputs {
+		rs := &extensions.ReplicaSet{}
+		// Use in.DeepCopy() to avoid sharing pointers with `in`.
+		if err := k8s_api_v1.Convert_v1_ReplicationController_to_extensions_ReplicaSet(in.DeepCopy(), rs, nil); err != nil {
+			t.Errorf("can't convert RC to RS: %v", err)
+			continue
+		}
+		// Round-trip RS before converting back to RC.
+		rs = roundTripRS(t, rs)
+		out := &v1.ReplicationController{}
+		if err := k8s_api_v1.Convert_extensions_ReplicaSet_to_v1_ReplicationController(rs, out, nil); err != nil {
+			t.Errorf("can't convert RS to RC: %v", err)
+			continue
+		}
+		if !apiequality.Semantic.DeepEqual(in, out) {
+			instr, _ := json.MarshalIndent(in, "", "  ")
+			outstr, _ := json.MarshalIndent(out, "", "  ")
+			t.Errorf("RC-RS conversion round-trip failed:\nin:\n%s\nout:\n%s", instr, outstr)
+		}
+	}
+}
+
+func roundTripRS(t *testing.T, rs *extensions.ReplicaSet) *extensions.ReplicaSet {
+	codec := legacyscheme.Codecs.LegacyCodec(extensionsv1beta1.SchemeGroupVersion)
+	data, err := runtime.Encode(codec, rs)
+	if err != nil {
+		t.Errorf("%v\n %#v", err, rs)
+		return nil
+	}
+	obj2, err := runtime.Decode(codec, data)
+	if err != nil {
+		t.Errorf("%v\nData: %s\nSource: %#v", err, string(data), rs)
+		return nil
+	}
+	obj3 := &extensions.ReplicaSet{}
+	err = legacyscheme.Scheme.Convert(obj2, obj3, nil)
+	if err != nil {
+		t.Errorf("%v\nSource: %#v", err, obj2)
+		return nil
+	}
+	return obj3
+}

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/BUILD

@@ -93,3 +93,13 @@ filegroup(
     srcs = ["generated.proto"],
     visibility = ["//visibility:public"],
 )
+
+go_test(
+    name = "go_default_xtest",
+    srcs = ["conversion_test.go"],
+    importpath = "k8s.io/apimachinery/pkg/apis/meta/v1_test",
+    deps = [
+        "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+    ],
+)

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/conversion.go

@@ -252,7 +252,6 @@ func Convert_map_to_unversioned_LabelSelector(in *map[string]string, out *LabelS
 	if in == nil {
 		return nil
 	}
-	out = new(LabelSelector)
 	for labelKey, labelValue := range *in {
 		AddLabelToSelector(out, labelKey, labelValue)
 	}

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/conversion_test.go

@@ -0,0 +1,49 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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 v1_test
+
+import (
+	"testing"
+
+	apiequality "k8s.io/apimachinery/pkg/api/equality"
+	"k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestMapToLabelSelectorRoundTrip(t *testing.T) {
+	// We should be able to round-trip a map-only selector through LabelSelector.
+	inputs := []map[string]string{
+		nil,
+		{},
+		{"one": "foo"},
+		{"one": "foo", "two": "bar"},
+	}
+	for _, in := range inputs {
+		ls := &v1.LabelSelector{}
+		if err := v1.Convert_map_to_unversioned_LabelSelector(&in, ls, nil); err != nil {
+			t.Errorf("Convert_map_to_unversioned_LabelSelector(%#v): %v", in, err)
+			continue
+		}
+		out := map[string]string{}
+		if err := v1.Convert_unversioned_LabelSelector_to_map(ls, &out, nil); err != nil {
+			t.Errorf("Convert_unversioned_LabelSelector_to_map(%#v): %v", ls, err)
+			continue
+		}
+		if !apiequality.Semantic.DeepEqual(in, out) {
+			t.Errorf("map-selector conversion round-trip failed: got %v; want %v", out, in)
+		}
+	}
+}