defaults.go

/*
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 v1beta1

import (
	"k8s.io/kubernetes/pkg/runtime"
	"k8s.io/kubernetes/pkg/util/intstr"
)

func addDefaultingFuncs(scheme *runtime.Scheme) {
	scheme.AddDefaultingFuncs(
		func(obj *APIVersion) {
			if len(obj.APIGroup) == 0 {
				obj.APIGroup = GroupName
			}
		},
		func(obj *DaemonSet) {
			labels := obj.Spec.Template.Labels

			// TODO: support templates defined elsewhere when we support them in the API
			if labels != nil {
				if obj.Spec.Selector == nil {
					obj.Spec.Selector = &LabelSelector{
						MatchLabels: labels,
					}
				}
				if len(obj.Labels) == 0 {
					obj.Labels = labels
				}
			}
		},
		func(obj *Deployment) {
			// Default labels and selector to labels from pod template spec.
			labels := obj.Spec.Template.Labels

			if labels != nil {
				if obj.Spec.Selector == nil {
					obj.Spec.Selector = &LabelSelector{MatchLabels: labels}
				}
				if len(obj.Labels) == 0 {
					obj.Labels = labels
				}
			}
			// Set DeploymentSpec.Replicas to 1 if it is not set.
			if obj.Spec.Replicas == nil {
				obj.Spec.Replicas = new(int32)
				*obj.Spec.Replicas = 1
			}
			strategy := &obj.Spec.Strategy
			// Set default DeploymentStrategyType as RollingUpdate.
			if strategy.Type == "" {
				strategy.Type = RollingUpdateDeploymentStrategyType
			}
			if strategy.Type == RollingUpdateDeploymentStrategyType {
				if strategy.RollingUpdate == nil {
					rollingUpdate := RollingUpdateDeployment{}
					strategy.RollingUpdate = &rollingUpdate
				}
				if strategy.RollingUpdate.MaxUnavailable == nil {
					// Set default MaxUnavailable as 1 by default.
					maxUnavailable := intstr.FromInt(1)
					strategy.RollingUpdate.MaxUnavailable = &maxUnavailable
				}
				if strategy.RollingUpdate.MaxSurge == nil {
					// Set default MaxSurge as 1 by default.
					maxSurge := intstr.FromInt(1)
					strategy.RollingUpdate.MaxSurge = &maxSurge
				}
			}
		},
		func(obj *Job) {
			labels := obj.Spec.Template.Labels
			// TODO: support templates defined elsewhere when we support them in the API
			if labels != nil {
				// if an autoselector is requested, we'll build the selector later with controller-uid and job-name
				autoSelector := bool(obj.Spec.AutoSelector != nil && *obj.Spec.AutoSelector)

				// otherwise, we are using a manual selector
				manualSelector := !autoSelector

				// and default behavior for an unspecified manual selector is to use the pod template labels
				if manualSelector && obj.Spec.Selector == nil {
					obj.Spec.Selector = &LabelSelector{
						MatchLabels: labels,
					}
				}
				if len(obj.Labels) == 0 {
					obj.Labels = labels
				}
			}
			// For a non-parallel job, you can leave both `.spec.completions` and
			// `.spec.parallelism` unset.  When both are unset, both are defaulted to 1.
			if obj.Spec.Completions == nil && obj.Spec.Parallelism == nil {
				obj.Spec.Completions = new(int32)
				*obj.Spec.Completions = 1
				obj.Spec.Parallelism = new(int32)
				*obj.Spec.Parallelism = 1
			}
			if obj.Spec.Parallelism == nil {
				obj.Spec.Parallelism = new(int32)
				*obj.Spec.Parallelism = 1
			}
		},
		func(obj *HorizontalPodAutoscaler) {
			if obj.Spec.MinReplicas == nil {
				minReplicas := int32(1)
				obj.Spec.MinReplicas = &minReplicas
			}
			if obj.Spec.CPUUtilization == nil {
				obj.Spec.CPUUtilization = &CPUTargetUtilization{TargetPercentage: 80}
			}
		},
		func(obj *ReplicaSet) {
			labels := obj.Spec.Template.Labels

			// TODO: support templates defined elsewhere when we support them in the API
			if labels != nil {
				if obj.Spec.Selector == nil {
					obj.Spec.Selector = &LabelSelector{
						MatchLabels: labels,
					}
				}
				if len(obj.Labels) == 0 {
					obj.Labels = labels
				}
			}
			if obj.Spec.Replicas == nil {
				obj.Spec.Replicas = new(int32)
				*obj.Spec.Replicas = 1
			}
		},
	)
}