fixing numeric pointer diffs (#18)

* add test for deployment replicas diff
* fix int marshalling and IntOrStr behaviour

Signed-off-by: Nandor Kracser <bonifaido@gmail.com>

Author: bonifaido

go.mod

@@ -9,6 +9,8 @@ require (
 	github.com/googleapis/gnostic v0.3.0 // indirect
 	github.com/goph/emperror v0.17.2
 	github.com/imdario/mergo v0.3.7 // indirect
+	github.com/json-iterator/go v0.0.0-20180701071628-ab8a2e0c74be
+	github.com/modern-go/reflect2 v1.0.1
 	github.com/pkg/errors v0.8.1
 	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 // indirect
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 // indirect
@@ -22,5 +24,5 @@ require (
 	k8s.io/client-go v0.15.7
 	k8s.io/klog v0.4.0
 	k8s.io/kube-openapi v0.0.0-20190722073852-5e22f3d471e6 // indirect
-	k8s.io/utils v0.0.0-20190809000727-6c36bc71fc4a // indirect
+	k8s.io/utils v0.0.0-20190809000727-6c36bc71fc4a
 )

integration_test.go

@@ -32,6 +32,7 @@ import (
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/intstr"
+	"k8s.io/utils/pointer"
 )
 
 func TestIntegration(t *testing.T) {
@@ -453,6 +454,33 @@ func TestIntegration(t *testing.T) {
 					},
 				},
 			}),
+		NewTestDiff("deployment does not match when replicas changes",
+			&appsv1.Deployment{
+				ObjectMeta: standardObjectMeta(),
+				Spec: appsv1.DeploymentSpec{
+					Selector: &metav1.LabelSelector{
+						MatchLabels: map[string]string{
+							"a": "b",
+						},
+					},
+					Template: v1.PodTemplateSpec{
+						ObjectMeta: metaWithLabels(map[string]string{
+							"a": "b",
+						}),
+						Spec: v1.PodSpec{
+							Containers: []v1.Container{
+								{
+									Name: "test-container", Image: "test-image",
+								},
+							},
+						},
+					},
+				},
+			}).
+			withLocalChange(func(i interface{}) {
+				pod := i.(*appsv1.Deployment)
+				pod.Spec.Replicas = pointer.Int32Ptr(0)
+			}),
 		NewTestMatch("hpa match",
 			&v2beta1.HorizontalPodAutoscaler{
 				ObjectMeta: standardObjectMeta(),

main_test.go

@@ -68,7 +68,7 @@ func TestMain(m *testing.M) {
 	if *integration {
 		err := testContext.Setup()
 		if err != nil {
-			panic("Failed to setup test namespace")
+			panic("Failed to setup test namespace: " + err.Error())
 		}
 	}
 	result := m.Run()

patch/annotation.go

@@ -15,7 +15,7 @@
 package patch
 
 import (
-	"encoding/json"
+	json "github.com/json-iterator/go"
 
 	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/runtime"

patch/deletenull.go

@@ -15,13 +15,39 @@
 package patch
 
 import (
-	"encoding/json"
 	"reflect"
+	"unsafe"
 
 	"github.com/goph/emperror"
+	json "github.com/json-iterator/go"
 	"github.com/pkg/errors"
+	"k8s.io/apimachinery/pkg/util/intstr"
 )
 
+func init() {
+	// k8s.io/apimachinery/pkg/util/intstr.IntOrString behaves really badly
+	// from JSON marshaling point of view, it can't be empty basically.
+	// So we need to override the defined marshaling behaviour and write nil
+	// instead of 0, because usually (in all observed cases) 0 means "not set"
+	// for IntOrStr types.
+	// To make this happen we need to pull in json-iterator and override the
+	// factory marshaling overrides.
+	json.RegisterTypeEncoderFunc("intstr.IntOrString",
+		func(ptr unsafe.Pointer, stream *json.Stream) {
+			i := (*intstr.IntOrString)(ptr)
+			if i.IntValue() == 0 {
+				stream.WriteNil()
+			} else {
+				stream.WriteInt(i.IntValue())
+			}
+		},
+		func(ptr unsafe.Pointer) bool {
+			i := (*intstr.IntOrString)(ptr)
+			return i.IntValue() == 0
+		},
+	)
+}
+
 func DeleteNullInJson(jsonBytes []byte) ([]byte, map[string]interface{}, error) {
 	var patchMap map[string]interface{}
 
@@ -115,6 +141,8 @@ func isZero(v reflect.Value) bool {
 	default:
 		z := reflect.Zero(v.Type())
 		return v.Interface() == z.Interface()
+	case reflect.Float64, reflect.Int64:
+		return false
 	case reflect.Func, reflect.Map, reflect.Slice:
 		return v.IsNil()
 	case reflect.Array:

patch/patch.go

@@ -15,8 +15,8 @@
 package patch
 
 import (
-	"encoding/json"
 	"fmt"
+	json "github.com/json-iterator/go"
 
 	"github.com/goph/emperror"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"