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node_labeller.go
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node_labeller.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 2021 Red Hat, Inc.
*
*/
package nodelabeller
import (
"context"
"encoding/json"
"reflect"
"strings"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/workqueue"
kubevirtv1 "kubevirt.io/client-go/api/v1"
"kubevirt.io/client-go/kubecli"
"kubevirt.io/client-go/log"
virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
util "kubevirt.io/kubevirt/pkg/virt-handler/node-labeller/util"
)
//NodeLabeller struct holds informations needed to run node-labeller
type NodeLabeller struct {
clientset kubecli.KubevirtClient
host string
namespace string
logger *log.FilteredLogger
clusterConfig *virtconfig.ClusterConfig
hypervFeatures supportedFeatures
hostCapabilities supportedFeatures
queue workqueue.RateLimitingInterface
supportedFeatures []string
cpuInfo cpuInfo
cpuModelVendor string
}
func NewNodeLabeller(clusterConfig *virtconfig.ClusterConfig, clientset kubecli.KubevirtClient, host, namespace string) (*NodeLabeller, error) {
n := &NodeLabeller{
clientset: clientset,
host: host,
namespace: namespace,
logger: log.DefaultLogger(),
clusterConfig: clusterConfig,
queue: workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
}
err := n.loadAll()
if err != nil {
return n, err
}
return n, nil
}
//Run runs node-labeller
func (n *NodeLabeller) Run(threadiness int, stop chan struct{}) {
defer n.queue.ShutDown()
n.logger.Infof("node-labeller is running")
n.clusterConfig.SetConfigModifiedCallback(func() {
n.queue.Add(n.host)
})
interval := 3 * time.Minute
go wait.JitterUntil(func() { n.queue.Add(n.host) }, interval, 1.2, true, stop)
for i := 0; i < threadiness; i++ {
go wait.Until(n.runWorker, time.Second, stop)
}
<-stop
}
func (n *NodeLabeller) runWorker() {
for n.execute() {
}
}
func (n *NodeLabeller) execute() bool {
key, quit := n.queue.Get()
if quit {
return false
}
defer n.queue.Done(key)
err := n.run()
if err != nil {
n.logger.Errorf("node-labeller sync error encountered: %v", err)
n.queue.AddRateLimited(key)
} else {
n.queue.Forget(key)
}
return true
}
func (n *NodeLabeller) loadAll() error {
err := n.loadCPUInfo()
if err != nil {
n.logger.Errorf("node-labeller could not load cpu info: " + err.Error())
return err
}
err = n.loadHostSupportedFeatures()
if err != nil {
n.logger.Errorf("node-labeller could not load supported features: " + err.Error())
return err
}
err = n.loadHostCapabilities()
if err != nil {
n.logger.Errorf("node-labeller could not load host capabilities: " + err.Error())
return err
}
n.loadHypervFeatures()
return nil
}
func (n *NodeLabeller) run() error {
var (
cpuFeatures map[string]bool
cpuModels []string
)
//parse all informations
cpuModels, cpuFeatures = n.getCPUInfo()
originalNode, err := n.clientset.CoreV1().Nodes().Get(context.Background(), n.host, metav1.GetOptions{})
if err != nil {
return err
}
node := originalNode.DeepCopy()
if skipNode(node) {
return nil
}
//prepare new labels
newLabels := n.prepareLabels(cpuModels, cpuFeatures)
//remove old labeller labels
n.removeLabellerLabels(node)
//add new labels
n.addLabellerLabels(node, newLabels)
err = n.patchNode(originalNode, node)
return err
}
func skipNode(node *v1.Node) bool {
_, exists := node.Annotations[kubevirtv1.LabellerSkipNodeAnnotation]
return exists
}
func (n *NodeLabeller) patchNode(originalNode, node *v1.Node) error {
type payload struct {
Op string `json:"op"`
Path string `json:"path"`
Value map[string]string `json:"value"`
}
p := make([]payload, 0)
if !reflect.DeepEqual(originalNode.Labels, node.Labels) {
p = append(p, payload{
Op: "test",
Path: "/metadata/labels",
Value: originalNode.Labels,
}, payload{
Op: "replace",
Path: "/metadata/labels",
Value: node.Labels,
})
}
if !reflect.DeepEqual(originalNode.Annotations, node.Annotations) {
p = append(p, payload{
Op: "test",
Path: "/metadata/annotations",
Value: originalNode.Annotations,
}, payload{
Op: "replace",
Path: "/metadata/annotations",
Value: node.Annotations,
},
)
}
//patch node only if there is change in labels or annotations
if len(p) > 0 {
payloadBytes, err := json.Marshal(p)
if err != nil {
return err
}
_, err = n.clientset.CoreV1().Nodes().Patch(context.Background(), node.Name, types.JSONPatchType, payloadBytes, metav1.PatchOptions{})
if err != nil {
return err
}
}
return nil
}
func (n *NodeLabeller) loadHypervFeatures() {
n.hypervFeatures.items = getCapLabels()
}
// prepareLabels converts cpu models, features, hyperv features to map[string]string format
// e.g. "cpu-feature.node.kubevirt.io/Penryn": "true"
func (n *NodeLabeller) prepareLabels(cpuModels []string, cpuFeatures cpuFeatures) map[string]string {
newLabels := make(map[string]string)
for key := range cpuFeatures {
newLabels[kubevirtv1.CPUFeatureLabel+key] = "true"
}
for _, value := range cpuModels {
newLabels[kubevirtv1.CPUModelLabel+value] = "true"
}
for _, key := range n.hypervFeatures.items {
newLabels[kubevirtv1.HypervLabel+key] = "true"
}
newLabels[kubevirtv1.CPUModelVendorLabel+n.cpuModelVendor] = "true"
return newLabels
}
// addNodeLabels adds labels and special annotation to node.
// annotations are needed because we need to know which labels were set by kubevirt.
func (n *NodeLabeller) addLabellerLabels(node *v1.Node, labels map[string]string) {
for label := range labels {
node.Labels[label] = "true"
}
}
// removeLabellerLabels removes labels from node
func (n *NodeLabeller) removeLabellerLabels(node *v1.Node) {
for label := range node.Labels {
if strings.Contains(label, util.DeprecatedLabelNamespace+util.DeprecatedcpuModelPrefix) ||
strings.Contains(label, util.DeprecatedLabelNamespace+util.DeprecatedcpuFeaturePrefix) ||
strings.Contains(label, util.DeprecatedLabelNamespace+util.DeprecatedHyperPrefix) ||
strings.Contains(label, kubevirtv1.CPUFeatureLabel) ||
strings.Contains(label, kubevirtv1.CPUModelLabel) ||
strings.Contains(label, kubevirtv1.HypervLabel) {
delete(node.Labels, label)
}
}
for annotation := range node.Annotations {
if strings.Contains(annotation, util.DeprecatedLabellerNamespaceAnnotation) {
delete(node.Annotations, annotation)
}
}
}