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state_actuator.go
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/
state_actuator.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 worker
import (
"context"
"encoding/json"
"sort"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
workerhelper "github.com/gardener/gardener/extensions/pkg/controller/worker/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
machinev1alpha1 "github.com/gardener/machine-controller-manager/pkg/apis/machine/v1alpha1"
"github.com/go-logr/logr"
"github.com/pkg/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type genericStateActuator struct {
logger logr.Logger
client client.Client
}
// NewStateActuator creates a new Actuator that reconciles Worker's State subresource
// It provides a default implementation that allows easier integration of providers.
func NewStateActuator(logger logr.Logger) StateActuator {
return &genericStateActuator{logger: logger.WithName("worker-state-actuator")}
}
func (a *genericStateActuator) InjectClient(client client.Client) error {
a.client = client
return nil
}
// Reconcile update the Worker state with the latest.
func (a *genericStateActuator) Reconcile(ctx context.Context, worker *extensionsv1alpha1.Worker) error {
copyOfWorker := worker.DeepCopy()
if err := a.updateWorkerState(ctx, copyOfWorker); err != nil {
return errors.Wrapf(err, "failed to update the state in worker status")
}
return nil
}
func (a *genericStateActuator) updateWorkerState(ctx context.Context, worker *extensionsv1alpha1.Worker) error {
state, err := a.getWorkerState(ctx, worker.Namespace)
if err != nil {
return err
}
rawState, err := json.Marshal(state)
if err != nil {
return err
}
return extensionscontroller.TryUpdateStatus(ctx, retry.DefaultBackoff, a.client, worker, func() error {
worker.Status.State = &runtime.RawExtension{Raw: rawState}
return nil
})
}
func (a *genericStateActuator) getWorkerState(ctx context.Context, namespace string) (*State, error) {
existingMachineDeployments := &machinev1alpha1.MachineDeploymentList{}
if err := a.client.List(ctx, existingMachineDeployments, client.InNamespace(namespace)); err != nil {
return nil, err
}
machineSets, err := a.getExistingMachineSetsMap(ctx, namespace)
if err != nil {
return nil, err
}
machines, err := a.getExistingMachinesMap(ctx, namespace)
if err != nil {
return nil, err
}
workerState := &State{
MachineDeployments: make(map[string]*MachineDeploymentState),
}
for _, deployment := range existingMachineDeployments.Items {
machineDeploymentState := &MachineDeploymentState{}
machineDeploymentState.Replicas = deployment.Spec.Replicas
machineDeploymentMachineSets, ok := machineSets[deployment.Name]
if !ok {
continue
}
addMachineSetToMachineDeploymentState(machineDeploymentMachineSets, machineDeploymentState)
for _, machineSet := range machineDeploymentMachineSets {
currentMachines := append(machines[machineSet.Name], machines[deployment.Name]...)
if len(currentMachines) <= 0 {
continue
}
for index := range currentMachines {
addMachineToMachineDeploymentState(¤tMachines[index], machineDeploymentState)
}
}
workerState.MachineDeployments[deployment.Name] = machineDeploymentState
}
return workerState, nil
}
// getExistingMachineSetsMap returns a map of existing MachineSets as values and their owners as keys
func (a *genericStateActuator) getExistingMachineSetsMap(ctx context.Context, namespace string) (map[string][]machinev1alpha1.MachineSet, error) {
existingMachineSets := &machinev1alpha1.MachineSetList{}
if err := a.client.List(ctx, existingMachineSets, client.InNamespace(namespace)); err != nil {
return nil, err
}
// When we read from the cache we get unsorted results, hence, we sort to prevent unnecessary state updates from happening.
sort.Slice(existingMachineSets.Items, func(i, j int) bool { return existingMachineSets.Items[i].Name < existingMachineSets.Items[j].Name })
return workerhelper.BuildOwnerToMachineSetsMap(existingMachineSets.Items), nil
}
// getExistingMachinesMap returns a map of the existing Machines as values and the name of their owner
// no matter of being machineSet or MachineDeployment. If a Machine has a ownerReference the key(owner)
// will be the MachineSet if not the key will be the name of the MachineDeployment which is stored as
// a label. We assume that there is no MachineDeployment and MachineSet with the same names.
func (a *genericStateActuator) getExistingMachinesMap(ctx context.Context, namespace string) (map[string][]machinev1alpha1.Machine, error) {
existingMachines := &machinev1alpha1.MachineList{}
if err := a.client.List(ctx, existingMachines, client.InNamespace(namespace)); err != nil {
return nil, err
}
// We temporarily filter out machines without provider ID or node status (VMs which got created but not yet joined the cluster)
// to prevent unnecessarily persisting them in the Worker state.
// TODO: Remove this again once machine-controller-manager supports backing off creation/deletion of failed machines, see
// https://github.com/gardener/machine-controller-manager/issues/483.
var filteredMachines []machinev1alpha1.Machine
for _, machine := range existingMachines.Items {
if machine.Spec.ProviderID != "" || machine.Status.Node != "" {
filteredMachines = append(filteredMachines, machine)
}
}
// When we read from the cache we get unsorted results, hence, we sort to prevent unnecessary state updates from happening.
sort.Slice(filteredMachines, func(i, j int) bool { return filteredMachines[i].Name < filteredMachines[j].Name })
return workerhelper.BuildOwnerToMachinesMap(filteredMachines), nil
}
func addMachineSetToMachineDeploymentState(machineSets []machinev1alpha1.MachineSet, machineDeploymentState *MachineDeploymentState) {
if len(machineSets) < 1 || machineDeploymentState == nil {
return
}
//remove redundant data from the machine set
for index := range machineSets {
machineSet := &machineSets[index]
machineSet.ObjectMeta = metav1.ObjectMeta{
Name: machineSet.Name,
Namespace: machineSet.Namespace,
Annotations: machineSet.Annotations,
Labels: machineSet.Labels,
}
machineSet.OwnerReferences = nil
machineSet.Status = machinev1alpha1.MachineSetStatus{}
}
machineDeploymentState.MachineSets = machineSets
}
func addMachineToMachineDeploymentState(machine *machinev1alpha1.Machine, machineDeploymentState *MachineDeploymentState) {
if machine == nil || machineDeploymentState == nil {
return
}
//remove redundant data from the machine
machine.ObjectMeta = metav1.ObjectMeta{
Name: machine.Name,
Namespace: machine.Namespace,
Annotations: machine.Annotations,
Labels: machine.Labels,
}
machine.OwnerReferences = nil
machine.Status = machinev1alpha1.MachineStatus{
Node: machine.Status.Node,
}
machineDeploymentState.Machines = append(machineDeploymentState.Machines, *machine)
}