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migration-create-admitter.go
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migration-create-admitter.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 admitters
import (
"context"
"encoding/json"
"fmt"
admissionv1 "k8s.io/api/admission/v1"
k8sv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
k8sfield "k8s.io/apimachinery/pkg/util/validation/field"
v1 "kubevirt.io/api/core/v1"
"kubevirt.io/client-go/kubecli"
webhookutils "kubevirt.io/kubevirt/pkg/util/webhooks"
"kubevirt.io/kubevirt/pkg/virt-api/webhooks"
virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
)
type MigrationCreateAdmitter struct {
ClusterConfig *virtconfig.ClusterConfig
VirtClient kubecli.KubevirtClient
}
func isMigratable(vmi *v1.VirtualMachineInstance) error {
for _, c := range vmi.Status.Conditions {
if c.Type == v1.VirtualMachineInstanceIsMigratable &&
c.Status == k8sv1.ConditionFalse {
return fmt.Errorf("Cannot migrate VMI, Reason: %s, Message: %s", c.Reason, c.Message)
}
}
return nil
}
func EnsureNoMigrationConflict(virtClient kubecli.KubevirtClient, vmiName string, namespace string) error {
labelSelector, err := labels.Parse(fmt.Sprintf("%s in (%s)", v1.MigrationSelectorLabel, vmiName))
if err != nil {
return err
}
list, err := virtClient.VirtualMachineInstanceMigration(namespace).List(context.Background(), metav1.ListOptions{
LabelSelector: labelSelector.String(),
})
if err != nil {
return err
}
if len(list.Items) > 0 {
for _, mig := range list.Items {
if mig.Status.Phase == v1.MigrationSucceeded || mig.Status.Phase == v1.MigrationFailed {
continue
}
return fmt.Errorf("in-flight migration detected. Active migration job (%s) is currently already in progress for VMI %s.", string(mig.UID), mig.Spec.VMIName)
}
}
return nil
}
func (admitter *MigrationCreateAdmitter) Admit(ar *admissionv1.AdmissionReview) *admissionv1.AdmissionResponse {
migration, _, err := getAdmissionReviewMigration(ar)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
if resp := webhookutils.ValidateSchema(v1.VirtualMachineInstanceMigrationGroupVersionKind, ar.Request.Object.Raw); resp != nil {
return resp
}
causes := ValidateVirtualMachineInstanceMigrationSpec(k8sfield.NewPath("spec"), &migration.Spec)
if len(causes) > 0 {
return webhookutils.ToAdmissionResponse(causes)
}
vmi, err := admitter.VirtClient.VirtualMachineInstance(migration.Namespace).Get(context.Background(), migration.Spec.VMIName, metav1.GetOptions{})
if errors.IsNotFound(err) {
// ensure VMI exists for the migration
return webhookutils.ToAdmissionResponseError(fmt.Errorf("the VMI \"%s/%s\" does not exist", migration.Namespace, migration.Spec.VMIName))
} else if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
// Don't allow introducing a migration job for a VMI that has already finalized
if vmi.IsFinal() {
return webhookutils.ToAdmissionResponseError(fmt.Errorf("Cannot migrate VMI in finalized state."))
}
// Reject migration jobs for non-migratable VMIs
err = isMigratable(vmi)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
// Don't allow new migration jobs to be introduced when previous migration jobs
// are already in flight.
err = EnsureNoMigrationConflict(admitter.VirtClient, migration.Spec.VMIName, migration.Namespace)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
reviewResponse := admissionv1.AdmissionResponse{}
reviewResponse.Allowed = true
return &reviewResponse
}
func getAdmissionReviewMigration(ar *admissionv1.AdmissionReview) (new *v1.VirtualMachineInstanceMigration, old *v1.VirtualMachineInstanceMigration, err error) {
if !webhookutils.ValidateRequestResource(ar.Request.Resource, webhooks.MigrationGroupVersionResource.Group, webhooks.MigrationGroupVersionResource.Resource) {
return nil, nil, fmt.Errorf("expect resource to be '%s'", webhooks.MigrationGroupVersionResource)
}
raw := ar.Request.Object.Raw
newMigration := v1.VirtualMachineInstanceMigration{}
err = json.Unmarshal(raw, &newMigration)
if err != nil {
return nil, nil, err
}
if ar.Request.Operation == admissionv1.Update {
raw := ar.Request.OldObject.Raw
oldMigration := v1.VirtualMachineInstanceMigration{}
err = json.Unmarshal(raw, &oldMigration)
if err != nil {
return nil, nil, err
}
return &newMigration, &oldMigration, nil
}
return &newMigration, nil, nil
}
func ValidateVirtualMachineInstanceMigrationSpec(field *k8sfield.Path, spec *v1.VirtualMachineInstanceMigrationSpec) []metav1.StatusCause {
var causes []metav1.StatusCause
if spec.VMIName == "" {
return append(causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueRequired,
Message: fmt.Sprintf("vmiName is missing"),
Field: field.Child("vmiName").String(),
})
}
return causes
}