forked from kubevirt/kubevirt
/
preset.go
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/
preset.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package mutating_webhook
import (
"fmt"
"reflect"
k8sv1 "k8s.io/api/core/v1"
k8smetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/tools/cache"
kubev1 "kubevirt.io/kubevirt/pkg/api/v1"
"kubevirt.io/kubevirt/pkg/log"
)
const exclusionMarking = "virtualmachineinstancepresets.admission.kubevirt.io/exclude"
// listPresets returns all VirtualMachinePresets by namespace
func listPresets(vmiPresetInformer cache.SharedIndexInformer, namespace string) ([]kubev1.VirtualMachineInstancePreset, error) {
indexer := vmiPresetInformer.GetIndexer()
selector := labels.NewSelector()
result := []kubev1.VirtualMachineInstancePreset{}
err := cache.ListAllByNamespace(indexer, namespace, selector, func(obj interface{}) {
preset := obj.(*kubev1.VirtualMachineInstancePreset)
result = append(result, *preset)
})
return result, err
}
// filterPresets returns list of VirtualMachinePresets which match given VirtualMachineInstance.
func filterPresets(list []kubev1.VirtualMachineInstancePreset, vmi *kubev1.VirtualMachineInstance) ([]kubev1.VirtualMachineInstancePreset, error) {
matchingPresets := []kubev1.VirtualMachineInstancePreset{}
for _, preset := range list {
selector, err := k8smetav1.LabelSelectorAsSelector(&preset.Spec.Selector)
if err != nil {
return matchingPresets, err
} else if selector.Matches(labels.Set(vmi.GetLabels())) {
log.Log.Object(vmi).Infof("VirtualMachineInstancePreset %s matches VirtualMachineInstance", preset.GetName())
matchingPresets = append(matchingPresets, preset)
}
}
return matchingPresets, nil
}
func checkMergeConflicts(presetSpec *kubev1.DomainSpec, vmiSpec *kubev1.DomainSpec) error {
errors := []error{}
if len(presetSpec.Resources.Requests) > 0 {
for key, presetReq := range presetSpec.Resources.Requests {
if vmiReq, ok := vmiSpec.Resources.Requests[key]; ok {
if presetReq != vmiReq {
errors = append(errors, fmt.Errorf("spec.resources.requests[%s]: %v != %v", key, presetReq, vmiReq))
}
}
}
}
if presetSpec.CPU != nil && vmiSpec.CPU != nil {
if !reflect.DeepEqual(presetSpec.CPU, vmiSpec.CPU) {
errors = append(errors, fmt.Errorf("spec.cpu: %v != %v", presetSpec.CPU, vmiSpec.CPU))
}
}
if presetSpec.Firmware != nil && vmiSpec.Firmware != nil {
if !reflect.DeepEqual(presetSpec.Firmware, vmiSpec.Firmware) {
errors = append(errors, fmt.Errorf("spec.firmware: %v != %v", presetSpec.Firmware, vmiSpec.Firmware))
}
}
if presetSpec.Clock != nil && vmiSpec.Clock != nil {
if !reflect.DeepEqual(presetSpec.Clock.ClockOffset, vmiSpec.Clock.ClockOffset) {
errors = append(errors, fmt.Errorf("spec.clock.clockoffset: %v != %v", presetSpec.Clock.ClockOffset, vmiSpec.Clock.ClockOffset))
}
if presetSpec.Clock.Timer != nil && vmiSpec.Clock.Timer != nil {
if !reflect.DeepEqual(presetSpec.Clock.Timer, vmiSpec.Clock.Timer) {
errors = append(errors, fmt.Errorf("spec.clock.timer: %v != %v", presetSpec.Clock.Timer, vmiSpec.Clock.Timer))
}
}
}
if presetSpec.Features != nil && vmiSpec.Features != nil {
if !reflect.DeepEqual(presetSpec.Features, vmiSpec.Features) {
errors = append(errors, fmt.Errorf("spec.features: %v != %v", presetSpec.Features, vmiSpec.Features))
}
}
if presetSpec.Devices.Watchdog != nil && vmiSpec.Devices.Watchdog != nil {
if !reflect.DeepEqual(presetSpec.Devices.Watchdog, vmiSpec.Devices.Watchdog) {
errors = append(errors, fmt.Errorf("spec.devices.watchdog: %v != %v", presetSpec.Devices.Watchdog, vmiSpec.Devices.Watchdog))
}
}
if presetSpec.IOThreadsPolicy != nil && vmiSpec.IOThreadsPolicy != nil {
if !reflect.DeepEqual(presetSpec.IOThreadsPolicy, vmiSpec.IOThreadsPolicy) {
errors = append(errors, fmt.Errorf("spec.ioThreadsPolicy: %v != %v", presetSpec.IOThreadsPolicy, vmiSpec.IOThreadsPolicy))
}
}
if len(errors) > 0 {
return utilerrors.NewAggregate(errors)
}
return nil
}
func mergeDomainSpec(presetSpec *kubev1.DomainSpec, vmiSpec *kubev1.DomainSpec) (bool, error) {
presetConflicts := checkMergeConflicts(presetSpec, vmiSpec)
applied := false
if len(presetSpec.Resources.Requests) > 0 {
if vmiSpec.Resources.Requests == nil {
vmiSpec.Resources.Requests = k8sv1.ResourceList{}
for key, val := range presetSpec.Resources.Requests {
vmiSpec.Resources.Requests[key] = val
}
}
if reflect.DeepEqual(vmiSpec.Resources.Requests, presetSpec.Resources.Requests) {
applied = true
}
}
if presetSpec.CPU != nil {
if vmiSpec.CPU == nil {
vmiSpec.CPU = &kubev1.CPU{}
presetSpec.CPU.DeepCopyInto(vmiSpec.CPU)
}
if reflect.DeepEqual(vmiSpec.CPU, presetSpec.CPU) {
applied = true
}
}
if presetSpec.Firmware != nil {
if vmiSpec.Firmware == nil {
vmiSpec.Firmware = &kubev1.Firmware{}
presetSpec.Firmware.DeepCopyInto(vmiSpec.Firmware)
}
if reflect.DeepEqual(vmiSpec.Firmware, presetSpec.Firmware) {
applied = true
}
}
if presetSpec.Clock != nil {
if vmiSpec.Clock == nil {
vmiSpec.Clock = &kubev1.Clock{}
vmiSpec.Clock.ClockOffset = presetSpec.Clock.ClockOffset
}
if reflect.DeepEqual(vmiSpec.Clock, presetSpec.Clock) {
applied = true
}
if presetSpec.Clock.Timer != nil {
if vmiSpec.Clock.Timer == nil {
vmiSpec.Clock.Timer = &kubev1.Timer{}
presetSpec.Clock.Timer.DeepCopyInto(vmiSpec.Clock.Timer)
}
if reflect.DeepEqual(vmiSpec.Clock.Timer, presetSpec.Clock.Timer) {
applied = true
}
}
}
if presetSpec.Features != nil {
if vmiSpec.Features == nil {
vmiSpec.Features = &kubev1.Features{}
presetSpec.Features.DeepCopyInto(vmiSpec.Features)
}
if reflect.DeepEqual(vmiSpec.Features, presetSpec.Features) {
applied = true
}
}
if presetSpec.Devices.Watchdog != nil {
if vmiSpec.Devices.Watchdog == nil {
vmiSpec.Devices.Watchdog = &kubev1.Watchdog{}
presetSpec.Devices.Watchdog.DeepCopyInto(vmiSpec.Devices.Watchdog)
}
if reflect.DeepEqual(vmiSpec.Devices.Watchdog, presetSpec.Devices.Watchdog) {
applied = true
}
}
if presetSpec.IOThreadsPolicy != nil {
if vmiSpec.IOThreadsPolicy == nil {
ioThreadsPolicy := *presetSpec.IOThreadsPolicy
vmiSpec.IOThreadsPolicy = &(ioThreadsPolicy)
}
if reflect.DeepEqual(vmiSpec.IOThreadsPolicy, presetSpec.IOThreadsPolicy) {
applied = true
}
}
return applied, presetConflicts
}
// Compare the domain of every preset to ensure they can all be applied cleanly
func checkPresetConflicts(presets []kubev1.VirtualMachineInstancePreset) error {
errors := []error{}
visitedPresets := []kubev1.VirtualMachineInstancePreset{}
for _, preset := range presets {
for _, visited := range visitedPresets {
err := checkMergeConflicts(preset.Spec.Domain, visited.Spec.Domain)
if err != nil {
errors = append(errors, fmt.Errorf("presets '%s' and '%s' conflict: %v", preset.Name, visited.Name, err))
}
}
visitedPresets = append(visitedPresets, preset)
}
if len(errors) > 0 {
return utilerrors.NewAggregate(errors)
}
return nil
}
func applyPresets(vmi *kubev1.VirtualMachineInstance, presetInformer cache.SharedIndexInformer) error {
if isVMIExcluded(vmi) {
log.Log.Object(vmi).Info("VMI excluded from preset logic")
return nil
}
presets, err := listPresets(presetInformer, vmi.Namespace)
if err != nil {
return err
}
presets, err = filterPresets(presets, vmi)
if err != nil {
return err
}
if len(presets) == 0 {
log.Log.Object(vmi).V(4).Infof("Unable to find any preset that can be accepted to the VMI %s", vmi.Name)
return nil
}
err = checkPresetConflicts(presets)
if err != nil {
return fmt.Errorf("VirtualMachinePresets cannot be applied due to conflicts: %v", err)
}
for _, preset := range presets {
applied, err := mergeDomainSpec(preset.Spec.Domain, &vmi.Spec.Domain)
if applied {
if err != nil {
log.Log.Object(vmi).Warningf("Some settings were not applied for VirtualMachineInstancePreset '%s': %v", preset.Name, err)
}
annotateVMI(vmi, preset)
log.Log.Object(vmi).V(4).Infof("Apply preset %s", preset.Name)
} else {
log.Log.Object(vmi).Warningf("Unable to apply VirtualMachineInstancePreset '%s': %v", preset.Name, err)
}
}
return nil
}
func annotateVMI(vmi *kubev1.VirtualMachineInstance, preset kubev1.VirtualMachineInstancePreset) {
if vmi.Annotations == nil {
vmi.Annotations = map[string]string{}
}
annotationKey := fmt.Sprintf("virtualmachinepreset.%s/%s", kubev1.GroupName, preset.Name)
vmi.Annotations[annotationKey] = kubev1.GroupVersion.String()
}
func isVMIExcluded(vmi *kubev1.VirtualMachineInstance) bool {
if vmi.Annotations != nil {
excluded, ok := vmi.Annotations[exclusionMarking]
return ok && (excluded == "true")
}
return false
}