Add nameHashTransformer

pkg/kinflate/transformers/labelsandannotations_test.go

@@ -25,13 +25,13 @@ import (
 	"k8s.io/kubectl/pkg/kinflate/types"
 )
 
-func makeConfigmap() *unstructured.Unstructured {
+func makeConfigmap(name string) *unstructured.Unstructured {
 	return &unstructured.Unstructured{
 		Object: map[string]interface{}{
 			"apiVersion": "v1",
 			"kind":       "ConfigMap",
 			"metadata": map[string]interface{}{
-				"name": "cm1",
+				"name": name,
 			},
 		},
 	}
@@ -92,7 +92,7 @@ func makeTestMap() types.KObject {
 		{
 			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"},
 			Name: "cm1",
-		}: makeConfigmap(),
+		}: makeConfigmap("cm1"),
 		{
 			GVK:  schema.GroupVersionKind{Group: "apps", Version: "v1", Kind: "Deployment"},
 			Name: "deploy1",

pkg/kinflate/transformers/namehash.go

@@ -0,0 +1,103 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/kubectl/pkg/kinflate/hash"
+	"k8s.io/kubectl/pkg/kinflate/types"
+)
+
+// nameHashTransformer contains the prefix and the path config for each field that
+// the name prefix will be applied.
+type nameHashTransformer struct{}
+
+var _ Transformer = &nameHashTransformer{}
+
+// NewNameHashTransformer construct a nameHashTransformer.
+func NewNameHashTransformer() Transformer {
+	return &nameHashTransformer{}
+}
+
+// Transform appends hash to configmaps and secrets.
+func (o *nameHashTransformer) Transform(m types.KObject) error {
+	for gvkn, obj := range m {
+		switch {
+		case types.SelectByGVK(gvkn.GVK, &schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"}):
+			appendHashForConfigMap(obj)
+
+		case types.SelectByGVK(gvkn.GVK, &schema.GroupVersionKind{Version: "v1", Kind: "Secret"}):
+			appendHashForSecret(obj)
+		}
+	}
+	return nil
+}
+
+func appendHashForConfigMap(obj *unstructured.Unstructured) error {
+	cm, err := unstructuredToConfigmap(obj)
+	if err != nil {
+		return err
+	}
+	h, err := hash.ConfigMapHash(cm)
+	if err != nil {
+		return err
+	}
+	nameWithHash := fmt.Sprintf("%s-%s", obj.GetName(), h)
+	obj.SetName(nameWithHash)
+	return nil
+}
+
+// TODO: Remove this function after we support hash unstructured objects
+func unstructuredToConfigmap(in *unstructured.Unstructured) (*v1.ConfigMap, error) {
+	marshaled, err := json.Marshal(in)
+	if err != nil {
+		return nil, err
+	}
+	var out v1.ConfigMap
+	err = json.Unmarshal(marshaled, &out)
+	return &out, err
+}
+
+func appendHashForSecret(obj *unstructured.Unstructured) error {
+	secret, err := unstructuredToSecret(obj)
+	if err != nil {
+		return err
+	}
+	h, err := hash.SecretHash(secret)
+	if err != nil {
+		return err
+	}
+	nameWithHash := fmt.Sprintf("%s-%s", obj.GetName(), h)
+	obj.SetName(nameWithHash)
+	return nil
+}
+
+// TODO: Remove this function after we support hash unstructured objects
+func unstructuredToSecret(in *unstructured.Unstructured) (*v1.Secret, error) {
+	marshaled, err := json.Marshal(in)
+	if err != nil {
+		return nil, err
+	}
+	var out v1.Secret
+	err = json.Unmarshal(marshaled, &out)
+	return &out, err
+}

pkg/kinflate/transformers/namehash_test.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"reflect"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/kubectl/pkg/kinflate/types"
+)
+
+func makeSecret(name string) *unstructured.Unstructured {
+	return &unstructured.Unstructured{
+		Object: map[string]interface{}{
+			"apiVersion": "v1",
+			"kind":       "Secret",
+			"metadata": map[string]interface{}{
+				"name": name,
+			},
+		},
+	}
+}
+
+func makeHashTestMap() types.KObject {
+	return types.KObject{
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"},
+			Name: "cm1",
+		}: makeConfigmap("cm1"),
+		{
+			GVK:  schema.GroupVersionKind{Group: "apps", Version: "v1", Kind: "Deployment"},
+			Name: "deploy1",
+		}: makeDeployment(),
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "Service"},
+			Name: "svc1",
+		}: makeService(),
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "Secret"},
+			Name: "secret1",
+		}: makeSecret("secret1"),
+	}
+}
+
+func makeExpectedHashTestMap() types.KObject {
+	return types.KObject{
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"},
+			Name: "cm1",
+		}: makeConfigmap("cm1-m462kdfb68"),
+		{
+			GVK:  schema.GroupVersionKind{Group: "apps", Version: "v1", Kind: "Deployment"},
+			Name: "deploy1",
+		}: makeDeployment(),
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "Service"},
+			Name: "svc1",
+		}: makeService(),
+		{
+			GVK:  schema.GroupVersionKind{Version: "v1", Kind: "Secret"},
+			Name: "secret1",
+		}: makeSecret("secret1-7kc45hd5f7"),
+	}
+}
+
+func TestNameHashTransformer(t *testing.T) {
+	objs := makeHashTestMap()
+
+	tran := NewNameHashTransformer()
+	tran.Transform(objs)
+
+	expected := makeExpectedHashTestMap()
+
+	if !reflect.DeepEqual(objs, expected) {
+		err := compareMap(objs, expected)
+		t.Fatalf("actual doesn't match expected: %v", err)
+	}
+}