feat: CRUD operations on namespace, pod and service using go-client a…

Dockerfile

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+FROM golang:alpine
+WORKDIR /k8
+COPY . .
+RUN go build -o main
+CMD [ "./main" ]

deploy.yaml

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+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: velo-assignment-access
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - namespaces
+  - pods
+  - services
+  verbs:
+  - get
+  - list
+  - create
+  - update
+  - delete
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: assignment-sa
+  namespace: ecommerce
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: velo-assignment-role-binding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: velo-assignment-access
+subjects:
+- kind: ServiceAccount
+  name: assignment-sa
+  namespace: ecommerce
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app.kubernetes.io/instance: ecommerce
+    app.kubernetes.io/name: ass1
+  name: ass1
+  namespace: ecommerce
+spec:
+  containers:
+  - image: k8:latest
+    imagePullPolicy: IfNotPresent
+    name: assignment-1
+    ports:
+    - containerPort: 80
+      name: http
+      protocol: TCP
+  restartPolicy: Never
+  serviceAccount: assignment-sa

go.mod

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+module github.com/velotio-tech/k8s-dev-training
+
+go 1.19
+
+require k8s.io/client-go v0.25.3
+
+require (
+	github.com/PuerkitoBio/purell v1.2.0 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
+	github.com/evanphx/json-patch/v5 v5.6.0 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.20.0 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/gnostic v0.6.9 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/imdario/mergo v0.3.13 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // 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/pkg/errors v0.9.1 // indirect
+	github.com/prometheus/client_golang v1.13.0 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/net v0.1.0 // indirect
+	golang.org/x/oauth2 v0.1.0 // indirect
+	golang.org/x/sys v0.1.0 // indirect
+	golang.org/x/term v0.1.0 // indirect
+	golang.org/x/text v0.4.0 // indirect
+	golang.org/x/time v0.1.0 // indirect
+	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.28.1 // 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 v0.25.3 // indirect
+	k8s.io/apiextensions-apiserver v0.25.3 // indirect
+	k8s.io/apimachinery v0.25.3 // indirect
+	k8s.io/component-base v0.25.3 // indirect
+	k8s.io/klog/v2 v2.80.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect
+	k8s.io/utils v0.0.0-20221012122500-cfd413dd9e85 // indirect
+	sigs.k8s.io/controller-runtime v0.13.0 // indirect
+	sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
+)

main.go

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+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/velotio-tech/k8s-dev-training/services"
+	controllerruntime "github.com/velotio-tech/k8s-dev-training/services/controller-runtime"
+	goclient "github.com/velotio-tech/k8s-dev-training/services/go-client"
+)
+
+func GetClient(name string) services.Client {
+	switch name {
+	case "go-client", "":
+		return goclient.GetClient()
+	case "controller-runtime":
+		return controllerruntime.GetClient()
+	}
+	return nil
+}
+
+func main() {
+	ctx := context.Background()
+	client := GetClient("controller-runtime")
+	ns := client.GetResource("ns")
+	p := client.GetResource("pod")
+	svc := client.GetResource("svc")
+
+	// NAMESPACE OPERATIONS
+	fmt.Println("=====CREATING NAMESPACE=====")
+	err := ns.Create(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println("=====UPDATING NAMESPACE LABELS=====")
+	err = ns.Update(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println()
+	err = ns.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// pod operations
+	fmt.Println("=====CREATING POD=====")
+	err = p.Create(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println("=====UPDATING POD LABELS=====")
+	err = p.Update(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Print("")
+	err = p.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// SERVICE OPERATIONS
+	fmt.Println("=====CREATING SVC=====")
+	err = svc.Create(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println("=====UPDATING SVC SELECTORS=====")
+	err = svc.Update(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Print("")
+	err = svc.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// try to connect with check if nginx is reachable after port-forward, delays deletion
+	time.Sleep(2 * time.Minute)
+
+	fmt.Println("=====DELETING SVC=====")
+	err = svc.Delete(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	err = svc.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	fmt.Println("=====DELETING POD=====")
+	err = p.Delete(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	err = p.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	// NAMESPACE OPERATIONS
+	fmt.Println("=====DELETING NAMESPACE=====")
+	err = ns.Delete(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println()
+	err = ns.List(ctx)
+	if err != nil {
+		fmt.Println(err)
+	}
+}

services/controller-runtime/client.go

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+package controllerruntime
+
+import (
+	"log"
+
+	"github.com/velotio-tech/k8s-dev-training/services"
+	"k8s.io/client-go/rest"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+type ControllerRuntime struct {
+	client.Client
+}
+
+func GetClient() *ControllerRuntime {
+	cfg, err := rest.InClusterConfig()
+	if err != nil {
+		log.Panicln(err)
+		return nil
+	}
+	c, err := client.New(cfg, client.Options{})
+	if err != nil {
+		log.Panicln(err)
+		return nil
+	}
+	return &ControllerRuntime{c}
+}
+
+func (c *ControllerRuntime) GetResource(name string) services.Resource {
+	switch name {
+	case "namespace", "ns", "namespaces":
+		return &Namespace{c}
+	case "pod", "pods", "po":
+		return &Pod{c}
+	case "svc", "service", "services":
+		return &Service{c}
+	}
+	return nil
+}

services/controller-runtime/namespace.go

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+package controllerruntime
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type Namespace struct {
+	client *ControllerRuntime
+}
+
+func (n *Namespace) Create(ctx context.Context) error {
+	ns := &v1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "namespace-1",
+		},
+	}
+	return n.client.Create(ctx, ns)
+}
+
+func (n *Namespace) List(ctx context.Context) error {
+	nsList := v1.NamespaceList{}
+	err := n.client.List(ctx, &nsList)
+	if err != nil {
+		return err
+	}
+	for _, ns := range nsList.Items {
+		fmt.Println(ns.Name, ns.Status.Phase, time.Since(ns.CreationTimestamp.Time).String(), ns.Labels)
+	}
+	return nil
+}
+
+func (n *Namespace) Update(ctx context.Context) error {
+
+	ns := &v1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "namespace-1",
+			Labels: map[string]string{
+				"label1_key": "label1_value",
+			},
+		},
+	}
+	return n.client.Update(ctx, ns)
+}
+
+func (n *Namespace) Delete(ctx context.Context) error {
+	ns := &v1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "namespace-1",
+		},
+	}
+	return n.client.Delete(ctx, ns)
+}