Move unrelated methods from the factory to helper

pkg/kubectl/polymorphichelpers/protocolsforobject.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2018 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 polymorphichelpers
+
+import (
+	"fmt"
+	"strconv"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	api "k8s.io/kubernetes/pkg/apis/core"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+func protocolsForObject(object runtime.Object) (map[string]string, error) {
+	// TODO: replace with a swagger schema based approach (identify pod selector via schema introspection)
+	switch t := object.(type) {
+	case *api.ReplicationController:
+		return getProtocols(t.Spec.Template.Spec), nil
+	case *api.Pod:
+		return getProtocols(t.Spec), nil
+	case *api.Service:
+		return getServiceProtocols(t.Spec), nil
+	case *extensions.Deployment:
+		return getProtocols(t.Spec.Template.Spec), nil
+	case *extensions.ReplicaSet:
+		return getProtocols(t.Spec.Template.Spec), nil
+	default:
+		return nil, fmt.Errorf("cannot extract protocols from %T", object)
+	}
+}
+
+func getProtocols(spec api.PodSpec) map[string]string {
+	result := make(map[string]string)
+	for _, container := range spec.Containers {
+		for _, port := range container.Ports {
+			result[strconv.Itoa(int(port.ContainerPort))] = string(port.Protocol)
+		}
+	}
+	return result
+}
+
+// Extracts the protocols exposed by a service from the given service spec.
+func getServiceProtocols(spec api.ServiceSpec) map[string]string {
+	result := make(map[string]string)
+	for _, servicePort := range spec.Ports {
+		result[strconv.Itoa(int(servicePort.Port))] = string(servicePort.Protocol)
+	}
+	return result
+}