/
actuator.go
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/
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 node
import (
"context"
"time"
azurev1alpha1 "github.com/gardener/remedy-controller/pkg/apis/azure/v1alpha1"
"github.com/gardener/remedy-controller/pkg/controller"
"github.com/gardener/remedy-controller/pkg/controller/azure"
"github.com/go-logr/logr"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
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"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const (
// TaintKeyUnreachable is the taint key to determine whether a node is unreachable.
TaintKeyUnreachable = "node.kubernetes.io/unreachable"
// HostnameLabel is a label to determine the hostname of a node.
HostnameLabel = "kubernetes.io/hostname"
)
type actuator struct {
client client.Client
namespace string
logger logr.Logger
}
// NewActuator creates a new Actuator.
func NewActuator(client client.Client, namespace string, logger logr.Logger) controller.Actuator {
logger.Info("Creating actuator", "namespace", namespace)
return &actuator{
client: client,
namespace: namespace,
logger: logger,
}
}
// CreateOrUpdate reconciles object creation or update.
func (a *actuator) CreateOrUpdate(ctx context.Context, obj runtime.Object) (requeueAfter time.Duration, err error) {
// Cast object to Node
var node *corev1.Node
var ok bool
if node, ok = obj.(*corev1.Node); !ok {
return 0, errors.New("reconciled object is not a node")
}
// Initialize labels
vmLabels := map[string]string{
azure.NodeLabel: node.Name,
}
// Get node properties
hostname := node.Labels[HostnameLabel]
providerID := node.Spec.ProviderID
notReadyOrUnreachable := !isNodeReady(node) || isNodeUnreachable(node)
// Create or update the VirtualMachine object for the node
vm := &azurev1alpha1.VirtualMachine{
ObjectMeta: metav1.ObjectMeta{
Name: node.Name,
Namespace: a.namespace,
},
}
a.logger.Info("Creating or updating virtualmachine", "name", vm.Name, "namespace", vm.Namespace)
if err := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
_, err := controllerutil.CreateOrUpdate(ctx, a.client, vm, func() error {
vm.Labels = vmLabels
vm.Spec.Hostname = hostname
vm.Spec.ProviderID = providerID
vm.Spec.NotReadyOrUnreachable = notReadyOrUnreachable
return nil
})
return err
}); err != nil {
return 0, errors.Wrap(err, "could not create or update virtualmachine")
}
return 0, nil
}
// Delete reconciles object deletion.
func (a *actuator) Delete(ctx context.Context, obj runtime.Object) error {
// Cast object to Node
var node *corev1.Node
var ok bool
if node, ok = obj.(*corev1.Node); !ok {
return errors.New("reconciled object is not a Node")
}
// Delete the VirtualMachine object for the node
vm := &azurev1alpha1.VirtualMachine{
ObjectMeta: metav1.ObjectMeta{
Name: node.Name,
Namespace: a.namespace,
},
}
a.logger.Info("Deleting virtualmachine", "name", vm.Name, "namespace", vm.Namespace)
if err := client.IgnoreNotFound(a.client.Delete(ctx, vm)); err != nil {
return errors.Wrap(err, "could not delete virtualmachine")
}
return nil
}
// ShouldFinalize returns true if the object should be finalized.
func (a *actuator) ShouldFinalize(_ context.Context, _ runtime.Object) (bool, error) {
return true, nil
}
func isNodeReady(node *corev1.Node) bool {
for _, condition := range node.Status.Conditions {
if condition.Type == corev1.NodeReady {
return condition.Status == corev1.ConditionTrue
}
}
return false
}
func isNodeUnreachable(node *corev1.Node) bool {
for _, taint := range node.Spec.Taints {
if taint.Key == TaintKeyUnreachable {
return true
}
}
return false
}