Move service test-helper funcs to a package

pkg/api/service/testing/make.go

@@ -0,0 +1,141 @@
+/*
+Copyright 2021 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 testing
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
+
+	api "k8s.io/kubernetes/pkg/apis/core"
+)
+
+// Tweak is a function that modifies a Service.
+type Tweak func(*api.Service)
+
+// MakeService helps construct Service objects (which pass API validation) more
+// legibly and tersely than a Go struct definition.  By default this produces
+// a ClusterIP service with a single port and a trivial selector.  The caller
+// can pass any number of tweak functions to further modify the result.
+func MakeService(name string, tweaks ...Tweak) *api.Service {
+	// NOTE: Any field that would be populated by defaulting needs to be
+	// present and valid here.
+	svc := &api.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: metav1.NamespaceDefault,
+		},
+		Spec: api.ServiceSpec{
+			Selector:        map[string]string{"k": "v"},
+			SessionAffinity: api.ServiceAffinityNone,
+		},
+	}
+	// Default to ClusterIP
+	SetTypeClusterIP(svc)
+	// Default to 1 port
+	SetPorts(MakeServicePort("", 93, intstr.FromInt(76), api.ProtocolTCP))(svc)
+
+	for _, tweak := range tweaks {
+		tweak(svc)
+	}
+
+	return svc
+}
+
+// SetTypeClusterIP sets the service type to ClusterIP and clears other fields.
+func SetTypeClusterIP(svc *api.Service) {
+	svc.Spec.Type = api.ServiceTypeClusterIP
+	for i := range svc.Spec.Ports {
+		svc.Spec.Ports[i].NodePort = 0
+	}
+	svc.Spec.ExternalName = ""
+}
+
+// SetTypeNodePort sets the service type to NodePort and clears other fields.
+func SetTypeNodePort(svc *api.Service) {
+	svc.Spec.Type = api.ServiceTypeNodePort
+	svc.Spec.ExternalTrafficPolicy = api.ServiceExternalTrafficPolicyTypeCluster
+	svc.Spec.ExternalName = ""
+}
+
+// SetTypeLoadBalancer sets the service type to LoadBalancer and clears other fields.
+func SetTypeLoadBalancer(svc *api.Service) {
+	svc.Spec.Type = api.ServiceTypeLoadBalancer
+	svc.Spec.ExternalTrafficPolicy = api.ServiceExternalTrafficPolicyTypeCluster
+	svc.Spec.ExternalName = ""
+}
+
+// SetTypeExternalName sets the service type to ExternalName and clears other fields.
+func SetTypeExternalName(svc *api.Service) {
+	svc.Spec.Type = api.ServiceTypeExternalName
+	svc.Spec.ExternalName = "example.com"
+	svc.Spec.ExternalTrafficPolicy = ""
+	svc.Spec.ClusterIP = ""
+	svc.Spec.ClusterIPs = nil
+}
+
+// SetPorts sets the service ports list.
+func SetPorts(ports ...api.ServicePort) Tweak {
+	return func(svc *api.Service) {
+		svc.Spec.Ports = ports
+	}
+}
+
+// MakeServicePort helps construct ServicePort objects which pass API
+// validation.
+func MakeServicePort(name string, port int, tgtPort intstr.IntOrString, proto api.Protocol) api.ServicePort {
+	return api.ServicePort{
+		Name:       name,
+		Port:       int32(port),
+		TargetPort: tgtPort,
+		Protocol:   proto,
+	}
+}
+
+// SetClusterIPs sets the service ClusterIP and ClusterIPs fields.
+func SetClusterIPs(ips ...string) Tweak {
+	return func(svc *api.Service) {
+		svc.Spec.ClusterIP = ips[0]
+		svc.Spec.ClusterIPs = ips
+	}
+}
+
+// SetIPFamilies sets the service IPFamilies field.
+func SetIPFamilies(families ...api.IPFamily) Tweak {
+	return func(svc *api.Service) {
+		svc.Spec.IPFamilies = families
+	}
+}
+
+// SetIPFamilyPolicy sets the service IPFamilyPolicy field.
+func SetIPFamilyPolicy(policy api.IPFamilyPolicyType) Tweak {
+	return func(svc *api.Service) {
+		svc.Spec.IPFamilyPolicy = &policy
+	}
+}
+
+// SetNodePorts sets the values for each node port, in order.  If less values
+// are specified than there are ports, the rest are untouched.
+func SetNodePorts(values ...int) Tweak {
+	return func(svc *api.Service) {
+		for i := range svc.Spec.Ports {
+			if i >= len(values) {
+				break
+			}
+			svc.Spec.Ports[i].NodePort = int32(values[i])
+		}
+	}
+}