149 lines
2.8 KiB
Go
149 lines
2.8 KiB
Go
package main
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import (
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"encoding/json"
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"os"
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"strings"
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"time"
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"github.com/avast/retry-go"
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jsonpatch "github.com/evanphx/json-patch"
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"github.com/gosimple/slug"
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"github.com/jaypipes/ghw"
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"github.com/prometheus/common/log"
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"go.uber.org/zap"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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)
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func main() {
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// NOTE(mnaser): Due to the fact that we don't want to run ghw in
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// a privileged context, we simply disable all warnings.
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os.Setenv("GHW_DISABLE_WARNINGS", "1")
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logger, _ := zap.NewProduction()
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log := logger.Named("node-labeler")
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nodeName, ok := os.LookupEnv("NODE")
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if !ok {
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log.Fatal("Environment variable is not defined",
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zap.String("var", "NODE"),
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)
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}
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log.Info("Starting service",
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zap.String("node", nodeName),
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)
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config, err := rest.InClusterConfig()
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if err != nil {
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log.Fatal(err.Error())
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}
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clientset, err := kubernetes.NewForConfig(config)
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if err != nil {
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log.Fatal(err.Error())
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}
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for {
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chassis, err := ghw.Chassis()
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if err != nil {
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log.Fatal(err.Error())
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}
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product, err := ghw.Product()
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if err != nil {
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log.Fatal(err.Error())
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}
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labels := map[string]string{
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"node.vexxhost.com/vendor": slug.Make(chassis.Vendor),
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"node.vexxhost.com/product": slug.Make(product.Name),
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}
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if CheckComputeNode(nodeName) {
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labels["node-role.openstack.org"] = "compute"
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}
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var node *v1.Node
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err = retry.Do(
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func() error {
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node, err = clientset.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
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return err
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},
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)
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if err != nil {
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log.Fatal(err.Error())
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}
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for label, value := range labels {
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err = addLabelToNode(clientset, node, label, value)
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if err != nil {
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log.Fatal(err.Error())
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}
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}
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time.Sleep(600 * time.Second)
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}
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}
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// checkComputeSubstring checks if the node name includes compute substring.
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func CheckComputeNode(nodeName string) bool {
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compute_tag := []string{
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"kvm",
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"compute",
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}
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for _, sub := range compute_tag {
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if strings.Contains(nodeName, sub) {
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return true
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}
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}
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return false
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}
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func addLabelToNode(clientset *kubernetes.Clientset, node *v1.Node, key string, value string) error {
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log.Info("Applying node label",
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zap.String(key, value),
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)
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originalNode, err := json.Marshal(node)
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if err != nil {
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return err
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}
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node.ObjectMeta.Labels[key] = value
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newNode, err := json.Marshal(node)
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if err != nil {
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return err
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}
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patch, err := jsonpatch.CreateMergePatch(originalNode, newNode)
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if err != nil {
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return err
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}
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log.Info("Patching Node resource",
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zap.String("node", node.ObjectMeta.Name),
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zap.String("patch", string(patch)),
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)
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err = retry.Do(
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func() error {
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_, err = clientset.CoreV1().Nodes().Patch(node.Name, types.MergePatchType, patch)
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return err
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},
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)
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if err != nil {
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return err
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}
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return nil
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}
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