/
machinedeployment_webhook.go
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/
machinedeployment_webhook.go
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/*
Copyright 2019 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 v1alpha3
import (
"fmt"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
runtime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/utils/pointer"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/webhook"
)
func (m *MachineDeployment) SetupWebhookWithManager(mgr ctrl.Manager) error {
return ctrl.NewWebhookManagedBy(mgr).
For(m).
Complete()
}
// +kubebuilder:webhook:verbs=create;update,path=/validate-cluster-x-k8s-io-v1alpha3-machinedeployment,mutating=false,failurePolicy=fail,matchPolicy=Equivalent,groups=cluster.x-k8s.io,resources=machinedeployments,versions=v1alpha3,name=validation.machinedeployment.cluster.x-k8s.io,sideEffects=None
// +kubebuilder:webhook:verbs=create;update,path=/mutate-cluster-x-k8s-io-v1alpha3-machinedeployment,mutating=true,failurePolicy=fail,matchPolicy=Equivalent,groups=cluster.x-k8s.io,resources=machinedeployments,versions=v1alpha3,name=default.machinedeployment.cluster.x-k8s.io,sideEffects=None
var _ webhook.Defaulter = &MachineDeployment{}
var _ webhook.Validator = &MachineDeployment{}
// Default implements webhook.Defaulter so a webhook will be registered for the type
func (m *MachineDeployment) Default() {
PopulateDefaultsMachineDeployment(m)
}
// ValidateCreate implements webhook.Validator so a webhook will be registered for the type
func (m *MachineDeployment) ValidateCreate() error {
return m.validate(nil)
}
// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
func (m *MachineDeployment) ValidateUpdate(old runtime.Object) error {
oldMD, ok := old.(*MachineDeployment)
if !ok {
return apierrors.NewBadRequest(fmt.Sprintf("expected a MachineDeployment but got a %T", old))
}
return m.validate(oldMD)
}
// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
func (m *MachineDeployment) ValidateDelete() error {
return nil
}
func (m *MachineDeployment) validate(old *MachineDeployment) error {
var allErrs field.ErrorList
selector, err := metav1.LabelSelectorAsSelector(&m.Spec.Selector)
if err != nil {
allErrs = append(
allErrs,
field.Invalid(field.NewPath("spec", "selector"), m.Spec.Selector, err.Error()),
)
} else if !selector.Matches(labels.Set(m.Spec.Template.Labels)) {
allErrs = append(
allErrs,
field.Invalid(
field.NewPath("spec", "template", "labels"),
m.Spec.Template.Labels,
fmt.Sprintf("must match spec.selector %q", selector.String()),
),
)
}
if old != nil && old.Spec.ClusterName != m.Spec.ClusterName {
allErrs = append(
allErrs,
field.Invalid(field.NewPath("spec", "clusterName"), m.Spec.ClusterName, "field is immutable"),
)
}
if len(allErrs) == 0 {
return nil
}
return apierrors.NewInvalid(GroupVersion.WithKind("MachineDeployment").GroupKind(), m.Name, allErrs)
}
// PopulateDefaultsMachineDeployment fills in default field values.
// This is also called during MachineDeployment sync.
func PopulateDefaultsMachineDeployment(d *MachineDeployment) {
if d.Labels == nil {
d.Labels = make(map[string]string)
}
d.Labels[ClusterLabelName] = d.Spec.ClusterName
if d.Spec.Replicas == nil {
d.Spec.Replicas = pointer.Int32Ptr(1)
}
if d.Spec.MinReadySeconds == nil {
d.Spec.MinReadySeconds = pointer.Int32Ptr(0)
}
if d.Spec.RevisionHistoryLimit == nil {
d.Spec.RevisionHistoryLimit = pointer.Int32Ptr(1)
}
if d.Spec.ProgressDeadlineSeconds == nil {
d.Spec.ProgressDeadlineSeconds = pointer.Int32Ptr(600)
}
if d.Spec.Selector.MatchLabels == nil {
d.Spec.Selector.MatchLabels = make(map[string]string)
}
if d.Spec.Strategy == nil {
d.Spec.Strategy = &MachineDeploymentStrategy{}
}
if d.Spec.Strategy.Type == "" {
d.Spec.Strategy.Type = RollingUpdateMachineDeploymentStrategyType
}
if d.Spec.Template.Labels == nil {
d.Spec.Template.Labels = make(map[string]string)
}
// Default RollingUpdate strategy only if strategy type is RollingUpdate.
if d.Spec.Strategy.Type == RollingUpdateMachineDeploymentStrategyType {
if d.Spec.Strategy.RollingUpdate == nil {
d.Spec.Strategy.RollingUpdate = &MachineRollingUpdateDeployment{}
}
if d.Spec.Strategy.RollingUpdate.MaxSurge == nil {
ios1 := intstr.FromInt(1)
d.Spec.Strategy.RollingUpdate.MaxSurge = &ios1
}
if d.Spec.Strategy.RollingUpdate.MaxUnavailable == nil {
ios0 := intstr.FromInt(0)
d.Spec.Strategy.RollingUpdate.MaxUnavailable = &ios0
}
}
// If no selector has been provided, add label and selector for the
// MachineDeployment's name as a default way of providing uniqueness.
if len(d.Spec.Selector.MatchLabels) == 0 && len(d.Spec.Selector.MatchExpressions) == 0 {
d.Spec.Selector.MatchLabels[MachineDeploymentLabelName] = d.Name
d.Spec.Template.Labels[MachineDeploymentLabelName] = d.Name
}
// Make sure selector and template to be in the same cluster.
d.Spec.Selector.MatchLabels[ClusterLabelName] = d.Spec.ClusterName
d.Spec.Template.Labels[ClusterLabelName] = d.Spec.ClusterName
}