fix: #181 Service processor missing IP family configuration support

- Add ipFamilyPolicy and ipFamilies fields to service templates
- Add parseIPFamily function to handle IP family configuration
- Update service template to include IP family spec between selector and ports
- Add test coverage for IP family functionality
- Update example charts to demonstrate the feature
- Add IPv6 service example to test data

This allows helmify to preserve IP family configuration when converting
Kubernetes Service manifests that use IPv6-only or dual-stack networking.

Author: ncldmg

examples/app/templates/myapp-ipv6-service.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "app.fullname" . }}-myapp-ipv6-service
+  labels:
+    app: myapp
+  {{- include "app.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.myappIpv6Service.type }}
+  selector:
+    app: myapp
+    {{- include "app.selectorLabels" . | nindent 4 }}
+  {{- if .Values.myappIpv6Service.ipFamilyPolicy }}
+  ipFamilyPolicy: {{ .Values.myappIpv6Service.ipFamilyPolicy }}
+  {{- end }}
+  {{- if .Values.myappIpv6Service.ipFamilies }}
+  ipFamilies:
+  {{- .Values.myappIpv6Service.ipFamilies | toYaml | nindent 2 }}
+  {{- end }}
+  ports:
+  {{- .Values.myappIpv6Service.ports | toYaml | nindent 2 }}

examples/app/values.yaml

@@ -103,6 +103,15 @@ myapp:
   revisionHistoryLimit: 5
   tolerations: []
   topologySpreadConstraints: []
+myappIpv6Service:
+  ipFamilies:
+  - IPv6
+  ipFamilyPolicy: PreferDualStack
+  ports:
+  - name: https
+    port: 8443
+    targetPort: https
+  type: ClusterIP
 myappLbService:
   loadBalancerSourceRanges:
   - 10.0.0.0/8

pkg/processor/service/service.go

@@ -25,7 +25,7 @@ spec:
   type: {{ .Values.%[1]s.type }}
   selector:
 %[2]s
-    {{- include "%[3]s.selectorLabels" . | nindent 4 }}
+    {{- include "%[3]s.selectorLabels" . | nindent 4 }}%[4]s
   ports:
   {{- .Values.%[1]s.ports | toYaml | nindent 2 }}`
 )
@@ -36,6 +36,17 @@ const (
   {{- .Values.%[1]s.loadBalancerSourceRanges | toYaml | nindent 2 }}`
 )
 
+const (
+	ipFamilyTempSpec = `
+  {{- if .Values.%[1]s.ipFamilyPolicy }}
+  ipFamilyPolicy: {{ .Values.%[1]s.ipFamilyPolicy }}
+  {{- end }}
+  {{- if .Values.%[1]s.ipFamilies }}
+  ipFamilies:
+  {{- .Values.%[1]s.ipFamilies | toYaml | nindent 2 }}
+  {{- end }}`
+)
+
 var svcGVC = schema.GroupVersionKind{
 	Group:   "",
 	Version: "v1",
@@ -102,7 +113,9 @@ func (r svc) Process(appMeta helmify.AppMetadata, obj *unstructured.Unstructured
 	}
 
 	_ = unstructured.SetNestedSlice(values, ports, shortNameCamel, "ports")
-	res := meta + fmt.Sprintf(svcTempSpec, shortNameCamel, selector, appMeta.ChartName())
+
+	ipFamilySpec := parseIPFamily(values, service, shortNameCamel)
+	res := meta + fmt.Sprintf(svcTempSpec, shortNameCamel, selector, appMeta.ChartName(), ipFamilySpec)
 
 	res += parseLoadBalancerSourceRanges(values, service, shortNameCamel)
 
@@ -116,6 +129,29 @@ func (r svc) Process(appMeta helmify.AppMetadata, obj *unstructured.Unstructured
 	}, nil
 }
 
+func parseIPFamily(values helmify.Values, service corev1.Service, shortNameCamel string) string {
+	hasIPFamilyPolicy := service.Spec.IPFamilyPolicy != nil
+	hasIPFamilies := len(service.Spec.IPFamilies) > 0
+
+	if !hasIPFamilyPolicy && !hasIPFamilies {
+		return ""
+	}
+
+	if hasIPFamilyPolicy {
+		_ = unstructured.SetNestedField(values, string(*service.Spec.IPFamilyPolicy), shortNameCamel, "ipFamilyPolicy")
+	}
+
+	if hasIPFamilies {
+		ipFamilies := make([]interface{}, len(service.Spec.IPFamilies))
+		for i, fam := range service.Spec.IPFamilies {
+			ipFamilies[i] = string(fam)
+		}
+		_ = unstructured.SetNestedSlice(values, ipFamilies, shortNameCamel, "ipFamilies")
+	}
+
+	return fmt.Sprintf(ipFamilyTempSpec, shortNameCamel)
+}
+
 func parseLoadBalancerSourceRanges(values helmify.Values, service corev1.Service, shortNameCamel string) string {
 	if len(service.Spec.LoadBalancerSourceRanges) < 1 {
 		return ""

pkg/processor/service/service_test.go

@@ -3,10 +3,10 @@ package service
 import (
 	"testing"
 
-	"github.com/arttor/helmify/pkg/metadata"
-
 	"github.com/arttor/helmify/internal"
+	"github.com/arttor/helmify/pkg/metadata"
 	"github.com/stretchr/testify/assert"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 )
 
 const svcYaml = `apiVersion: v1
@@ -24,6 +24,25 @@ spec:
   selector:
     control-plane: controller-manager`
 
+const svcWithIPFamilyYaml = `apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    control-plane: controller-manager
+  name: my-operator-controller-manager-metrics-service
+  namespace: my-operator-system
+spec:
+  ipFamilyPolicy: PreferDualStack
+  ipFamilies:
+  - IPv4
+  - IPv6
+  ports:
+  - name: https
+    port: 8443
+    targetPort: https
+  selector:
+    control-plane: controller-manager`
+
 func Test_svc_Process(t *testing.T) {
 	var testInstance svc
 
@@ -39,4 +58,23 @@ func Test_svc_Process(t *testing.T) {
 		assert.NoError(t, err)
 		assert.Equal(t, false, processed)
 	})
+
+	t.Run("processed with IP family", func(t *testing.T) {
+		obj := internal.GenerateObj(svcWithIPFamilyYaml)
+		processed, template, err := testInstance.Process(&metadata.Service{}, obj)
+		assert.NoError(t, err)
+		assert.Equal(t, true, processed)
+		assert.NotNil(t, template)
+
+		values := template.Values()
+		ipFamilyPolicy, found, err := unstructured.NestedString(values, "myOperatorControllerManagerMetricsService", "ipFamilyPolicy")
+		assert.NoError(t, err)
+		assert.True(t, found)
+		assert.Equal(t, "PreferDualStack", ipFamilyPolicy)
+
+		ipFamilies, found, err := unstructured.NestedSlice(values, "myOperatorControllerManagerMetricsService", "ipFamilies")
+		assert.NoError(t, err)
+		assert.True(t, found)
+		assert.Len(t, ipFamilies, 2)
+	})
 }

test_data/sample-app.yaml

@@ -156,6 +156,25 @@ spec:
   loadBalancerSourceRanges:
     - 10.0.0.0/8
 ---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: myapp
+  name: myapp-ipv6-service
+  namespace: my-ns
+spec:
+  ipFamilyPolicy: PreferDualStack
+  ipFamilies:
+  - IPv6
+  ports:
+    - name: https
+      port: 8443
+      targetPort: https
+  selector:
+    app: myapp
+---
+---
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata: