Merge pull request '(feat): Label Nodes' (#2) from feature/tt/label-node into main

Reviewed-on: #2

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21 as build
+FROM golang:1.22 as build
 
 WORKDIR /app
 

go.mod

@@ -1,26 +1,62 @@
 module git.uploadfilter24.eu/covidnetes/metallb-ip-floater
 
-go 1.21.1
+go 1.22.0
+
+toolchain go1.23.2
 
 require (
 	github.com/gorilla/mux v1.8.1
-	github.com/hetznercloud/hcloud-go v1.53.0
+	github.com/hetznercloud/hcloud-go v1.59.1
 	github.com/jinzhu/configor v1.2.2
-	github.com/prometheus/client_model v0.5.0
+	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.46.0
+	github.com/prometheus/common v0.60.0
 	github.com/sirupsen/logrus v1.9.3
+	k8s.io/client-go v0.31.1
 )
 
 require (
-	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/BurntSushi/toml v1.4.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/kr/text v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/prometheus/client_golang v1.18.0 // indirect
+	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
-	golang.org/x/net v0.20.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
-	golang.org/x/sys v0.16.0 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
-	golang.org/x/text v0.14.0 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
-	google.golang.org/protobuf v1.32.0 // indirect
+	github.com/go-openapi/swag v0.22.4 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_golang v1.20.4 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	golang.org/x/net v0.30.0 // indirect
+	golang.org/x/oauth2 v0.23.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/term v0.25.0 // indirect
+	golang.org/x/text v0.19.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.31.1 // indirect
+	k8s.io/apimachinery v0.31.1 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect
+	k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
+	sigs.k8s.io/yaml v1.4.0 // indirect
 )

go.sum

@@ -1,56 +1,181 @@
 github.com/BurntSushi/toml v1.2.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
-github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
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-github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
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 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
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internal/hetzner.go

@@ -83,6 +83,10 @@ func AttachFloatingIpToNode(cfg *Config, server hcloud.Server) error {
 			log.WithFields(log.Fields{
 				"Caller": "AttachFloatingIpToNode",
 			}).Info(fmt.Sprintf("Floating IP %s already assigned to Node %s", cfg.FloatingIPName, server.Name))
+			err = LabelNode(server.Name)
+			if err != nil {
+				return errors.New(fmt.Sprintf("Could not label node: %s", err.Error()))
+			}
 			return nil
 		}
 	}
@@ -95,5 +99,11 @@ func AttachFloatingIpToNode(cfg *Config, server hcloud.Server) error {
 	log.WithFields(log.Fields{
 		"Caller": "AttachFloatingIpToNode",
 	}).Info(fmt.Sprintf("Attached floating ip %s to node %s", cfg.FloatingIPName, server.Name))
+
+	err = LabelNode(server.Name)
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not label node: %s", err.Error()))
+	}
+
 	return err
 }

internal/kube.go

@@ -0,0 +1,94 @@
+package internal
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	log "github.com/sirupsen/logrus"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func generateClient() (kubernetes.Clientset, error) {
+	log.WithFields(log.Fields{
+		"Caller": "generateClient",
+	}).Info(fmt.Sprintf("Generating k8s client"))
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		return kubernetes.Clientset{}, errors.New(fmt.Sprintf("Could not generate in cluster config: %s", err.Error()))
+	}
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		return kubernetes.Clientset{}, errors.New(fmt.Sprintf("Could not generate clientset: %s", err.Error()))
+	}
+	return *clientset, nil
+}
+
+func LabelNode(nodeName string) error {
+
+	client, err := generateClient()
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not generate client: %s", err.Error()))
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Trying to label node %s", nodeName))
+
+	labelKey := "metallb-speaker"
+	labelValue := "true"
+
+	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not find Kubernetes node: %s", err.Error()))
+	}
+
+	if node.Labels == nil {
+		node.Labels = make(map[string]string)
+	}
+	node.Labels[labelKey] = labelValue
+
+	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not update node label: %s", err.Error()))
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Node %s labeled with %s=%s\n", nodeName, labelKey, labelValue))
+
+	return nil
+
+}
+
+// TODO: handle node change
+func RemoveLabelFromNode(nodeName string) error {
+	client, err := generateClient()
+	if err != nil {
+		return errors.New(fmt.Sprintf("Could not generate client: %s", err.Error()))
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Removing Label from node %s", nodeName))
+
+	labelKey := "metallb-speaker"
+
+	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
+	if err != nil {
+		panic(err.Error())
+	}
+
+	delete(node.Labels, labelKey)
+
+	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
+	if err != nil {
+		panic(err.Error())
+	}
+
+	fmt.Printf("Label %s removed from node %s\n", labelKey, nodeName)
+
+	return nil
+}

internal/metrics.go

@@ -45,7 +45,7 @@ func GetIpFromMetrics(metrics *dto.MetricFamily) (string, error) {
 		for _, label := range metric.Label {
 			if *label.Name == "ip" {
 				log.WithFields(log.Fields{
-					"Caller": "Main",
+					"Caller": "GetIpFromMetrics",
 				}).Info(fmt.Sprintf("Found IP Label: %s", *label.Value))
 				return *label.Value, nil
 			}