pod template visitor

pkg/kinflate/pod_template_visitor/pod_template_visitor.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2017 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 pod_template_visitor
+
+import (
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	kapps "k8s.io/kubectl/pkg/kinflate/apps"
+)
+
+type PodTemplateSpecVisitor struct {
+	Object  *unstructured.Unstructured
+	MungeFn func(podTemplateSpec map[string]interface{}) error
+	Err     error
+}
+
+var _ kapps.KindVisitor = &PodTemplateSpecVisitor{}
+
+func (v *PodTemplateSpecVisitor) VisitDeployment(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitStatefulSet(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitDaemonSet(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitJob(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitReplicaSet(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitPod(kind kapps.GroupKindElement) {}
+
+func (v *PodTemplateSpecVisitor) VisitReplicationController(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "template"})
+}
+
+func (v *PodTemplateSpecVisitor) VisitCronJob(kind kapps.GroupKindElement) {
+	v.Err = v.mungePodTemplateSpec([]string{"spec", "jobTemplate", "spec", "template"})
+}
+
+func walkMapPath(start map[string]interface{}, path []string) (map[string]interface{}, error) {
+	finish := start
+	for i := 0; i < len(path); i++ {
+		var ok bool
+		finish, ok = finish[path[i]].(map[string]interface{})
+		if !ok {
+			return nil, fmt.Errorf("key:%s of path:%v not found in map:%v", path[i], path, start)
+		}
+	}
+
+	return finish, nil
+}
+
+func (v *PodTemplateSpecVisitor) mungePodTemplateSpec(pathToPodTemplateSpec []string) error {
+	obj := v.Object.UnstructuredContent()
+	podTemplateSpec, err := walkMapPath(obj, pathToPodTemplateSpec)
+	if err != nil {
+		return err
+	}
+	return v.MungeFn(podTemplateSpec)
+}