Add DeepCopy! Also-- optimize conversion for []byte

pkg/conversion/converter.go

@@ -71,7 +71,7 @@ type Converter struct {
 
 // NewConverter creates a new Converter object.
 func NewConverter() *Converter {
-	return &Converter{
+	c := &Converter{
 		conversionFuncs:    map[typePair]reflect.Value{},
 		defaultingFuncs:    map[reflect.Type]reflect.Value{},
 		nameFunc:           func(t reflect.Type) string { return t.Name() },
@@ -81,6 +81,15 @@ func NewConverter() *Converter {
 		inputFieldMappingFuncs: map[reflect.Type]FieldMappingFunc{},
 		inputDefaultFlags:      map[reflect.Type]FieldMatchingFlags{},
 	}
+	c.RegisterConversionFunc(byteSliceCopy)
+	return c
+}
+
+// Prevent recursing into every byte...
+func byteSliceCopy(in *[]byte, out *[]byte, s Scope) error {
+	*out = make([]byte, len(*in))
+	copy(*out, *in)
+	return nil
 }
 
 // Scope is passed to conversion funcs to allow them to continue an ongoing conversion.

pkg/conversion/converter_test.go

@@ -26,6 +26,19 @@ import (
 	"github.com/google/gofuzz"
 )
 
+func TestConverter_byteSlice(t *testing.T) {
+	c := NewConverter()
+	src := []byte{1, 2, 3}
+	dest := []byte{}
+	err := c.Convert(&src, &dest, 0, nil)
+	if err != nil {
+		t.Fatalf("expected no error")
+	}
+	if e, a := src, dest; !reflect.DeepEqual(e, a) {
+		t.Errorf("expected %#v, got %#v", e, a)
+	}
+}
+
 func TestConverter_DefaultConvert(t *testing.T) {
 	type A struct {
 		Foo string

pkg/conversion/deep_copy.go

@@ -0,0 +1,38 @@
+/*
+Copyright 2015 Google Inc. 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 conversion
+
+import (
+	"reflect"
+)
+
+var deepCopier = NewConverter()
+
+// DeepCopy makes a deep copy of source. Won't work for any private fields!
+// For nil slices, will return 0-length slices. These are equivilent in
+// basically every way except for the way that reflect.DeepEqual checks.
+func DeepCopy(source interface{}) (interface{}, error) {
+	src := reflect.ValueOf(source)
+	v := reflect.New(src.Type()).Elem()
+	s := &scope{
+		converter: deepCopier,
+	}
+	if err := deepCopier.convert(src, v, s); err != nil {
+		return nil, err
+	}
+	return v.Interface(), nil
+}

pkg/conversion/deep_copy_test.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2015 Google Inc. 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 conversion
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/google/gofuzz"
+)
+
+func TestDeepCopy(t *testing.T) {
+	semantic := EqualitiesOrDie()
+	f := fuzz.New().NilChance(.5).NumElements(0, 100)
+	table := []interface{}{
+		map[string]string{},
+		int(5),
+		"hello world",
+		struct {
+			A, B, C struct {
+				D map[string]int
+			}
+			X []int
+			Y []byte
+		}{},
+	}
+	for _, obj := range table {
+		obj2, err := DeepCopy(obj)
+		if err != nil {
+			t.Errorf("Error: couldn't copy %#v", obj)
+			continue
+		}
+		if e, a := obj, obj2; !semantic.DeepEqual(e, a) {
+			t.Errorf("expected %#v\ngot %#v", e, a)
+		}
+
+		obj3 := reflect.New(reflect.TypeOf(obj)).Interface()
+		f.Fuzz(obj3)
+		obj4, err := DeepCopy(obj3)
+		if err != nil {
+			t.Errorf("Error: couldn't copy %#v", obj)
+			continue
+		}
+		if e, a := obj3, obj4; !semantic.DeepEqual(e, a) {
+			t.Errorf("expected %#v\ngot %#v", e, a)
+		}
+		f.Fuzz(obj3)
+	}
+}
+
+func copyOrDie(t *testing.T, in interface{}) interface{} {
+	out, err := DeepCopy(in)
+	if err != nil {
+		t.Fatalf("DeepCopy failed: %#q: %v", in, err)
+	}
+	return out
+}
+
+func TestDeepCopySliceSeparate(t *testing.T) {
+	x := []int{5}
+	y := copyOrDie(t, x).([]int)
+	x[0] = 3
+	if y[0] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyArraySeparate(t *testing.T) {
+	x := [1]int{5}
+	y := copyOrDie(t, x).([1]int)
+	x[0] = 3
+	if y[0] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyMapSeparate(t *testing.T) {
+	x := map[string]int{"foo": 5}
+	y := copyOrDie(t, x).(map[string]int)
+	x["foo"] = 3
+	if y["foo"] == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}
+
+func TestDeepCopyPointerSeparate(t *testing.T) {
+	z := 5
+	x := &z
+	y := copyOrDie(t, x).(*int)
+	*x = 3
+	if *y == 3 {
+		t.Errorf("deep copy wasn't deep: %#q %#q", x, y)
+	}
+}

pkg/kubectl/cmd/config/config_test.go

@@ -25,6 +25,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd"
 	clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
@@ -667,7 +668,7 @@ func (test configCommandTest) run(t *testing.T) string {
 	testSetNilMapsToEmpties(reflect.ValueOf(&actualConfig))
 	testClearLocationOfOrigin(&actualConfig)
 
-	if !reflect.DeepEqual(test.expectedConfig, actualConfig) {
+	if !api.Semantic.DeepEqual(test.expectedConfig, actualConfig) {
 		t.Errorf("diff: %v", util.ObjectDiff(test.expectedConfig, actualConfig))
 		t.Errorf("expected: %#v\n actual:   %#v", test.expectedConfig, actualConfig)
 	}