132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
/*
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"context"
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"encoding/json"
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"net"
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"os"
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"strings"
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"time"
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jsonpatch "github.com/evanphx/json-patch"
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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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logger, err := zap.NewProduction()
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if err != nil {
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log.Fatal(err.Error())
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}
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log := logger.Named("nodelabeler")
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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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network, err := net.InterfaceByName(os.Getenv("VM_BRIDGE_INTERFACE"))
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if err != nil {
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log.Fatal(err.Error())
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}
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addrs, err := network.Addrs()
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if err != nil {
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log.Fatal(err.Error())
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}
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ifaceAddr := strings.Split(addrs[0].String(), "/")[0]
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labels := map[string]string{
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"airshipit.org/vino.nodebridgegw": ifaceAddr,
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}
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ctx := context.Background()
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node, err := clientset.CoreV1().Nodes().Get(ctx, nodeName, metav1.GetOptions{})
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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(ctx, 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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func addLabelToNode(
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ctx context.Context,
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clientset *kubernetes.Clientset,
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node *v1.Node,
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key, 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 = clientset.CoreV1().Nodes().Patch(ctx, node.Name, types.MergePatchType, patch, metav1.PatchOptions{})
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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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