/
actuator_restore.go
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/
actuator_restore.go
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// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 genericactuator
import (
"context"
"encoding/json"
"fmt"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
workercontroller "github.com/gardener/gardener/extensions/pkg/controller/worker"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
machinev1alpha1 "github.com/gardener/machine-controller-manager/pkg/apis/machine/v1alpha1"
"github.com/go-logr/logr"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// Restore uses the Worker's spec to figure out the wanted MachineDeployments. Then it parses the Worker's state.
// If there is a record in the state corresponding to a wanted deployment then the Restore function
// deploys that MachineDeployment with all related MachineSet and Machines.
func (a *genericActuator) Restore(ctx context.Context, log logr.Logger, worker *extensionsv1alpha1.Worker, cluster *extensionscontroller.Cluster) error {
log = log.WithValues("operation", "restore")
workerDelegate, err := a.delegateFactory.WorkerDelegate(ctx, worker, cluster)
if err != nil {
return fmt.Errorf("could not instantiate actuator context: %w", err)
}
// Generate the desired machine deployments.
log.Info("Generating machine deployments")
wantedMachineDeployments, err := workerDelegate.GenerateMachineDeployments(ctx)
if err != nil {
return fmt.Errorf("failed to generate the machine deployments: %w", err)
}
// Get the list of all existing machine deployments.
existingMachineDeployments := &machinev1alpha1.MachineDeploymentList{}
if err := a.client.List(ctx, existingMachineDeployments, client.InNamespace(worker.Namespace)); err != nil {
return err
}
// Parse the worker state to a separate machineDeployment states and attach them to
// the corresponding machineDeployments which are to be deployed later
log.Info("Extracting state from worker status")
if err := a.addStateToMachineDeployment(worker, wantedMachineDeployments); err != nil {
return err
}
wantedMachineDeployments = removeWantedDeploymentWithoutState(wantedMachineDeployments)
// Scale the machine-controller-manager to 0. During restoration MCM must not be working
if err := a.scaleMachineControllerManager(ctx, log, worker, 0); err != nil {
return fmt.Errorf("failed scale down machine-controller-manager: %w", err)
}
// Deploy generated machine classes.
if err := workerDelegate.DeployMachineClasses(ctx); err != nil {
return fmt.Errorf("failed to deploy the machine classes: %w", err)
}
if err := kubernetes.WaitUntilDeploymentScaledToDesiredReplicas(ctx, a.client, kutil.Key(worker.Namespace, McmDeploymentName), 0); err != nil && !apierrors.IsNotFound(err) {
return fmt.Errorf("deadline exceeded while scaling down machine-controller-manager: %w", err)
}
// Do the actual restoration
if err := a.restoreMachineSetsAndMachines(ctx, log, wantedMachineDeployments); err != nil {
return fmt.Errorf("failed restoration of the machineSet and the machines: %w", err)
}
// Generate machine deployment configuration based on previously computed list of deployments and deploy them.
if err := a.deployMachineDeployments(ctx, log, cluster, worker, existingMachineDeployments, wantedMachineDeployments, workerDelegate.MachineClassKind(), true); err != nil {
return fmt.Errorf("failed to restore the machine deployment config: %w", err)
}
// Finally reconcile the worker so that the machine-controller-manager gets scaled up and OwnerReferences between
// machinedeployments, machinesets and machines are added properly.
return a.Reconcile(ctx, log, worker, cluster)
}
func (a *genericActuator) addStateToMachineDeployment(worker *extensionsv1alpha1.Worker, wantedMachineDeployments workercontroller.MachineDeployments) error {
if worker.Status.State == nil || len(worker.Status.State.Raw) <= 0 {
return nil
}
// Parse the worker state to MachineDeploymentStates
workerState := &workercontroller.State{
MachineDeployments: make(map[string]*workercontroller.MachineDeploymentState),
}
if err := json.Unmarshal(worker.Status.State.Raw, &workerState); err != nil {
return err
}
// Attach the parsed MachineDeploymentStates to the wanted MachineDeployments
for index, wantedMachineDeployment := range wantedMachineDeployments {
wantedMachineDeployments[index].State = workerState.MachineDeployments[wantedMachineDeployment.Name]
}
return nil
}
func (a *genericActuator) restoreMachineSetsAndMachines(ctx context.Context, log logr.Logger, wantedMachineDeployments workercontroller.MachineDeployments) error {
log.Info("Deploying Machines and MachineSets")
for _, wantedMachineDeployment := range wantedMachineDeployments {
for _, machineSet := range wantedMachineDeployment.State.MachineSets {
if err := a.client.Create(ctx, &machineSet); kutil.IgnoreAlreadyExists(err) != nil {
return err
}
}
for _, machine := range wantedMachineDeployment.State.Machines {
if err := a.client.Create(ctx, &machine); err != nil {
if !apierrors.IsAlreadyExists(err) {
return err
}
}
}
}
return nil
}
func removeWantedDeploymentWithoutState(wantedMachineDeployments workercontroller.MachineDeployments) workercontroller.MachineDeployments {
if wantedMachineDeployments == nil {
return nil
}
reducedMachineDeployments := make(workercontroller.MachineDeployments, 0)
for _, wantedMachineDeployment := range wantedMachineDeployments {
if wantedMachineDeployment.State != nil && len(wantedMachineDeployment.State.MachineSets) > 0 {
reducedMachineDeployments = append(reducedMachineDeployments, wantedMachineDeployment)
}
}
return reducedMachineDeployments
}