JSON marshaling/unmarshaling of label Selector

pkg/api/unversioned/selector.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2015 The Kubernetes Authors 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 unversioned
+
+import (
+	"encoding/json"
+
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+// FieldSelector is a wrapper around fields.Selector that allows for
+// Marshaling/Unmarshaling underlying selector.
+type FieldSelector struct {
+	Selector fields.Selector
+}
+
+func (sh FieldSelector) MarshalJSON() ([]byte, error) {
+	return json.Marshal(sh.Selector.String())
+}
+
+func (sh *FieldSelector) UnmarshalJSON(b []byte) error {
+	var unmarshalled string
+	if err := json.Unmarshal(b, &unmarshalled); err != nil {
+		return err
+	}
+	selector, err := fields.ParseSelector(unmarshalled)
+	if err != nil {
+		return err
+	}
+	sh.Selector = selector
+	return nil
+}
+
+// LabelSelector is a wrapper around labels.Selector that allow for
+// Marshaling/Unmarshaling underlying selector.
+type LabelSelector struct {
+	Selector labels.Selector
+}
+
+func (sh LabelSelector) MarshalJSON() ([]byte, error) {
+	return json.Marshal(sh.Selector.String())
+}
+
+func (sh *LabelSelector) UnmarshalJSON(b []byte) error {
+	var unmarshalled string
+	if err := json.Unmarshal(b, &unmarshalled); err != nil {
+		return err
+	}
+	selector, err := labels.Parse(unmarshalled)
+	if err != nil {
+		return err
+	}
+	sh.Selector = selector
+	return nil
+}

pkg/api/unversioned/selector_test.go

@@ -0,0 +1,139 @@
+/*
+Copyright 2015 The Kubernetes Authors 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 unversioned
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+
+	"github.com/ghodss/yaml"
+	"github.com/ugorji/go/codec"
+
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+type FieldSelectorWrapper struct {
+	Holder FieldSelector `json:"holder"`
+}
+
+func parseFieldSelector(t *testing.T, selector string) fields.Selector {
+	result, err := fields.ParseSelector(selector)
+	if err != nil {
+		t.Fatalf("Unexpected error: %#v", err)
+	}
+	return result
+}
+
+func TestFieldSelectorMarshal(t *testing.T) {
+	cases := []struct {
+		selector fields.Selector
+		result   string
+	}{
+		{parseFieldSelector(t, ""), "{\"holder\":\"\"}"},
+		{parseFieldSelector(t, "foo=bar"), "{\"holder\":\"foo=bar\"}"},
+		{parseFieldSelector(t, "foo=bar,bar=foo"), "{\"holder\":\"bar=foo,foo=bar\"}"},
+		{parseFieldSelector(t, "foo=bar,bar!=foo"), "{\"holder\":\"bar!=foo,foo=bar\"}"},
+	}
+
+	for _, c := range cases {
+		wrapper := FieldSelectorWrapper{FieldSelector{c.selector}}
+		marshalled, err := json.Marshal(&wrapper)
+		if err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if string(marshalled) != c.result {
+			t.Errorf("Expected: %s, got: %s", c.result, string(marshalled))
+		}
+
+		var result FieldSelectorWrapper
+		if err := json.Unmarshal(marshalled, &result); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(result, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, result)
+		}
+
+		var yamlResult FieldSelectorWrapper
+		if err := yaml.Unmarshal(marshalled, &yamlResult); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(yamlResult, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, yamlResult)
+		}
+
+		var codecResult FieldSelectorWrapper
+		if err := codec.NewDecoderBytes(marshalled, new(codec.JsonHandle)).Decode(&codecResult); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(codecResult, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, codecResult)
+		}
+	}
+}
+
+type LabelSelectorWrapper struct {
+	Holder LabelSelector `json:"holder"`
+}
+
+func TestSelectorMarshal(t *testing.T) {
+	cases := []struct {
+		input  labels.Set
+		result string
+	}{
+		{labels.Set(map[string]string{}), "{\"holder\":\"\"}"},
+		{labels.Set(map[string]string{"foo": "bar"}), "{\"holder\":\"foo=bar\"}"},
+		{labels.Set(map[string]string{"foo": "bar", "bar": "foo"}), "{\"holder\":\"bar=foo,foo=bar\"}"},
+	}
+
+	for _, c := range cases {
+		selector := c.input.AsSelector()
+		wrapper := LabelSelectorWrapper{LabelSelector{selector}}
+		marshalled, err := json.Marshal(&wrapper)
+		if err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if string(marshalled) != c.result {
+			t.Errorf("Expected: %s, got: %s", c.result, string(marshalled))
+		}
+
+		var result LabelSelectorWrapper
+		if err := json.Unmarshal(marshalled, &result); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(result, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, result)
+		}
+
+		var yamlResult LabelSelectorWrapper
+		if err := yaml.Unmarshal(marshalled, &yamlResult); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(yamlResult, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, yamlResult)
+		}
+
+		var codecResult LabelSelectorWrapper
+		if err := codec.NewDecoderBytes(marshalled, new(codec.JsonHandle)).Decode(&codecResult); err != nil {
+			t.Errorf("Unexpected error: %#v", err)
+		}
+		if !reflect.DeepEqual(codecResult, wrapper) {
+			t.Errorf("Expected: %#v, got: %#v", wrapper, codecResult)
+		}
+	}
+}

pkg/labels/selector.go

@@ -729,5 +729,7 @@ func SelectorFromSet(ls Set) Selector {
 			requirements = append(requirements, *r)
 		}
 	}
+	// sort to have deterministic string representation
+	sort.Sort(ByKey(requirements))
 	return LabelSelector(requirements)
 }