/
node_labeleler.go
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/
node_labeleler.go
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/*
Copyright 2020 The Kubermatic Kubernetes Platform contributors.
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 nodelabeler
import (
"context"
"fmt"
"strings"
"go.uber.org/zap"
"github.com/kubermatic/kubermatic/api/pkg/controller/user-cluster-controller-manager/node-labeler/api"
corev1 "k8s.io/api/core/v1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/client-go/tools/record"
ctrlruntimeclient "sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
const (
// This controller creates events on the nodes, so do not put the word Kubermatic in it
controllerName = "node_label_controller"
)
type reconciler struct {
ctx context.Context
log *zap.SugaredLogger
client ctrlruntimeclient.Client
recorder record.EventRecorder
labels map[string]string
}
func Add(ctx context.Context, log *zap.SugaredLogger, mgr manager.Manager, labels map[string]string) error {
log = log.Named(controllerName)
r := &reconciler{
ctx: ctx,
log: log,
client: mgr.GetClient(),
recorder: mgr.GetEventRecorderFor(controllerName),
labels: labels,
}
c, err := controller.New(controllerName, mgr, controller.Options{
Reconciler: r,
})
if err != nil {
return fmt.Errorf("failed to create controller: %v", err)
}
// Ignore update events that don't touch the labels
labelsChangedPredicate := predicate.Funcs{
UpdateFunc: func(e event.UpdateEvent) bool {
return !apiequality.Semantic.DeepEqual(e.MetaOld.GetLabels(), e.MetaNew.GetLabels())
},
}
if err := c.Watch(
&source.Kind{Type: &corev1.Node{}},
&handler.EnqueueRequestForObject{},
labelsChangedPredicate,
); err != nil {
return fmt.Errorf("failed to establish watch for nodes: %v", err)
}
return nil
}
func (r *reconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
log := r.log.With("Node", request.Name)
log.Debug("Reconciling")
node := &corev1.Node{}
if err := r.client.Get(r.ctx, request.NamespacedName, node); err != nil {
if kerrors.IsNotFound(err) {
log.Debug("Node not found, returning")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("failed to get node: %v", err)
}
err := r.reconcile(log, node)
if err != nil {
log.Errorw("Reconciling failed", zap.Error(err))
r.recorder.Event(node, corev1.EventTypeWarning, "ApplyingLabelsFailed", err.Error())
}
return reconcile.Result{}, err
}
func (r *reconciler) reconcile(log *zap.SugaredLogger, node *corev1.Node) error {
oldNode := node.DeepCopy()
var labelsChanged bool
if node.Labels == nil {
node.Labels = map[string]string{}
}
for key, value := range r.labels {
if node.Labels[key] != value {
log.Debugw("Setting label", "label-key", key, "old-label-value", node.Labels[key], "new-label-value", value)
labelsChanged = true
node.Labels[key] = value
}
}
distributionLabelChanged, err := applyDistributionLabel(log, node)
if err != nil {
return fmt.Errorf("failed to apply distribution label: %v", err)
}
labelsChanged = labelsChanged || distributionLabelChanged
if !labelsChanged {
log.Debug("No label changes, not updating node")
return nil
}
if err := r.client.Patch(r.ctx, node, ctrlruntimeclient.MergeFrom(oldNode)); err != nil {
return fmt.Errorf("failed to update node: %v", err)
}
return nil
}
func applyDistributionLabel(log *zap.SugaredLogger, node *corev1.Node) (changed bool, err error) {
osImage := node.Status.NodeInfo.OSImage
wantedLabel := findDistributionLabel(node.Status.NodeInfo.OSImage)
if wantedLabel == "" {
return false, fmt.Errorf("could not detect distribution from image name %q", osImage)
}
if node.Labels[api.DistributionLabelKey] == wantedLabel {
return false, nil
}
node.Labels[api.DistributionLabelKey] = wantedLabel
log.Debugw("Setting label", "label-key", api.DistributionLabelKey, "old-label-value", node.Labels[api.DistributionLabelKey], "new-label-value", wantedLabel)
return true, nil
}
// findDistributionLabel finds the best label value for a given
// OS image string. It returns the longest match to ensure consistent
// results.
func findDistributionLabel(osImage string) string {
osImage = strings.ToLower(osImage)
matchedLabel := ""
matchedValue := ""
for k, v := range api.OSLabelMatchValues {
if strings.Contains(osImage, v) && len(v) > len(matchedValue) {
matchedLabel = k
matchedValue = v
}
}
return matchedLabel
}