From 067f87515e6e28ab1e0ff56a0ffdfe9ac66ec340 Mon Sep 17 00:00:00 2001 From: Shiwam Jaiswal Date: Thu, 3 Oct 2024 12:34:52 +0530 Subject: [PATCH] feat(complete): completed assignment 1 --- assignment-1/go.mod | 56 +++++ assignment-1/go.sum | 172 ++++++++++++++ assignment-1/main.go | 532 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 760 insertions(+) create mode 100644 assignment-1/go.mod create mode 100644 assignment-1/go.sum create mode 100644 assignment-1/main.go diff --git a/assignment-1/go.mod b/assignment-1/go.mod new file mode 100644 index 0000000..1ba2ee4 --- /dev/null +++ b/assignment-1/go.mod @@ -0,0 +1,56 @@ +module assignment-1 + +go 1.22.0 + +toolchain go1.22.7 + +require ( + k8s.io/api v0.31.1 + k8s.io/apimachinery v0.31.1 + k8s.io/client-go v0.31.1 + sigs.k8s.io/controller-runtime v0.19.0 +) + +require ( + github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/evanphx/json-patch/v5 v5.9.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/logr v1.4.2 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // 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/imdario/mergo v0.3.6 // 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/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/spf13/pflag v1.0.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + go.uber.org/zap v1.27.0 // indirect + golang.org/x/net v0.26.0 // indirect + golang.org/x/oauth2 v0.21.0 // indirect + golang.org/x/sys v0.21.0 // indirect + golang.org/x/term v0.21.0 // indirect + golang.org/x/text v0.16.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/protobuf v1.34.2 // 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/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 +) diff --git a/assignment-1/go.sum b/assignment-1/go.sum new file mode 100644 index 0000000..aa9011e --- /dev/null +++ b/assignment-1/go.sum @@ -0,0 +1,172 @@ +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM= +github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g= +github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/evanphx/json-patch/v5 v5.9.0 h1:kcBlZQbplgElYIlo/n1hJbls2z/1awpXxpRi0/FOJfg= +github.com/evanphx/json-patch/v5 v5.9.0/go.mod h1:VNkHZ/282BpEyt/tObQO8s5CMPmYYq14uClGH4abBuQ= +github.com/fxamacker/cbor/v2 v2.7.0 h1:iM5WgngdRBanHcxugY4JySA0nk1wZorNOpTgCMedv5E= +github.com/fxamacker/cbor/v2 v2.7.0/go.mod h1:pxXPTn3joSm21Gbwsv0w9OSA2y1HFR9qXEeXQVeNoDQ= +github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY= +github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-logr/zapr v1.3.0 h1:XGdV8XW8zdwFiwOA2Dryh1gj2KRQyOOoNmBy4EplIcQ= +github.com/go-logr/zapr v1.3.0/go.mod h1:YKepepNBd1u/oyhd/yQmtjVXmm9uML4IXUgMOwR8/Gg= +github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE= +github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs= +github.com/go-openapi/jsonreference v0.20.2 h1:3sVjiK66+uXK/6oQ8xgcRKcFgQ5KXa2KvnJRumpMGbE= +github.com/go-openapi/jsonreference v0.20.2/go.mod h1:Bl1zwGIM8/wsvqjsOQLJ/SH+En5Ap4rVB5KVcIDZG2k= +github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14= +github.com/go-openapi/swag v0.22.4 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v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/assignment-1/main.go b/assignment-1/main.go new file mode 100644 index 0000000..546343f --- /dev/null +++ b/assignment-1/main.go @@ -0,0 +1,532 @@ +package main + +import ( + "context" + "errors" + "flag" + "fmt" + "k8s.io/apimachinery/pkg/api/resource" + "k8s.io/apimachinery/pkg/util/intstr" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/clientcmd" + "k8s.io/client-go/util/homedir" + "log" + "os" + "path/filepath" + "sigs.k8s.io/controller-runtime/pkg/client" + "time" + + appsv1 "k8s.io/api/apps/v1" + apiv1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/util/retry" +) + +func int32Ptr(i int32) *int32 { return &i } + +type Resource struct { + name string + ready bool +} +type K8sClient interface { + GetResource() (*Resource, error) + CreateResource() error + UpdateResource() error + DeleteResource() error +} + +type DeploymentClientSet struct { + clientSet *kubernetes.Clientset + deployment *appsv1.Deployment +} + +func IsDeploymentReady(deployment *appsv1.Deployment) bool { + availableReplicas := int32(0) + // Check if the deployment is progressing + for _, condition := range deployment.Status.Conditions { + if condition.Type == appsv1.DeploymentProgressing && condition.Status == apiv1.ConditionTrue { + fmt.Println(condition.Message) + } + if condition.Type == appsv1.DeploymentAvailable && condition.Status == apiv1.ConditionTrue { + fmt.Println(condition.Message) + availableReplicas += 1 + } + } + return availableReplicas == deployment.Status.Replicas +} + +func ToDeploymentResource(deployment *appsv1.Deployment) (*Resource, error) { + return &Resource{ + name: deployment.Name, + ready: IsDeploymentReady(deployment), + }, nil +} + +func (d *DeploymentClientSet) CreateResource() error { + result, err := d.clientSet.AppsV1().Deployments(apiv1.NamespaceDefault).Create(context.TODO(), d.deployment, metav1.CreateOptions{}) + if err != nil { + return err + } + fmt.Printf("Deployment %s created\n", result.Name) + return nil +} + +func (d *DeploymentClientSet) GetResource() (*Resource, error) { + result, err := d.clientSet.AppsV1().Deployments(apiv1.NamespaceDefault).Get(context.TODO(), d.deployment.Name, metav1.GetOptions{}) + if err != nil { + return nil, err + } + d.deployment = result + return ToDeploymentResource(result) +} + +func (d *DeploymentClientSet) UpdateResource() error { + fmt.Println("Trigger Deployment update") + retryErr := retry.RetryOnConflict(retry.DefaultRetry, func() error { + result, getErr := d.clientSet.AppsV1().Deployments(apiv1.NamespaceDefault).Get(context.TODO(), d.deployment.Name, metav1.GetOptions{}) + if getErr != nil { + return getErr + } + result.Spec.Replicas = int32Ptr(1) + result.Spec.Template.Spec.Containers[0].Image = "nginx:1.13" + _, updateErr := d.clientSet.AppsV1().Deployments(apiv1.NamespaceDefault).Update(context.TODO(), result, metav1.UpdateOptions{}) + return updateErr + }) + if retryErr != nil { + return retryErr + } + return nil +} + +func (d *DeploymentClientSet) DeleteResource() error { + deletePolicy := metav1.DeletePropagationForeground + err := d.clientSet.AppsV1().Deployments(apiv1.NamespaceDefault).Delete(context.TODO(), d.deployment.Name, metav1.DeleteOptions{ + PropagationPolicy: &deletePolicy, + }) + if err != nil { + return err + } + fmt.Println("Deployment deleted") + return nil +} + +type ServiceClientSet struct { + clientSet *kubernetes.Clientset + service *apiv1.Service +} + +func IsServiceReady(service *apiv1.Service) bool { + ready := true + // Access the Service ClusterIP + fmt.Printf("Service %s found with ClusterIP: %s\n", service.Name, service.Spec.ClusterIP) + + // If it’s a LoadBalancer type service, check external IPs + if service.Spec.Type == apiv1.ServiceTypeLoadBalancer { + if len(service.Status.LoadBalancer.Ingress) > 0 { + fmt.Printf("Service %s is exposed via external IP: %s\n", service.Name, service.Status.LoadBalancer.Ingress[0].IP) + } else { + fmt.Printf("Service %s is waiting for an external IP\n", service.Name) + ready = false + } + } + return ready +} + +func ToServiceResource(service *apiv1.Service) (*Resource, error) { + return &Resource{ + name: service.Name, + ready: IsServiceReady(service), + }, nil +} + +func (s *ServiceClientSet) CreateResource() error { + result, err := s.clientSet.CoreV1().Services(apiv1.NamespaceDefault).Create(context.TODO(), s.service, metav1.CreateOptions{}) + if err != nil { + return err + } + fmt.Printf("Service %s created\n", result.Name) + return nil +} + +func (s *ServiceClientSet) GetResource() (*Resource, error) { + result, err := s.clientSet.CoreV1().Services(apiv1.NamespaceDefault).Get(context.TODO(), s.service.Name, metav1.GetOptions{}) + if err != nil { + return nil, err + } + + s.service = result + return ToServiceResource(result) +} + +func (s *ServiceClientSet) UpdateResource() error { + fmt.Println("Service update is not implemented") + return nil +} + +func (s *ServiceClientSet) DeleteResource() error { + err := s.clientSet.CoreV1().Services(apiv1.NamespaceDefault).Delete(context.TODO(), s.service.Name, metav1.DeleteOptions{}) + if err != nil { + return err + } + fmt.Println("Service deleted") + return nil +} + +type VolumeClientSet struct { + clientSet *kubernetes.Clientset + pvc *apiv1.PersistentVolumeClaim +} + +func IsVolumeReady(pvc *apiv1.PersistentVolumeClaim) bool { + ready := false + // Access the PVC status + fmt.Printf("PVC %s found with status phase: %s\n", pvc.Name, pvc.Status.Phase) + + // Check if PVC is bound + if pvc.Status.Phase == apiv1.ClaimBound { + fmt.Printf("PVC %s is bound\n", pvc.Name) + ready = true + } else { + fmt.Printf("PVC %s is not yet bound\n", pvc.Name) + } + return ready +} + +func ToVolumeResource(pvc *apiv1.PersistentVolumeClaim) (*Resource, error) { + return &Resource{ + name: pvc.Name, + ready: IsVolumeReady(pvc), + }, nil +} + +func (v *VolumeClientSet) CreateResource() error { + result, err := v.clientSet.CoreV1().PersistentVolumeClaims(apiv1.NamespaceDefault).Create(context.TODO(), v.pvc, metav1.CreateOptions{}) + if err != nil { + return err + } + fmt.Printf("Volume %s created\n", result.Name) + return nil +} + +func (v *VolumeClientSet) GetResource() (*Resource, error) { + result, err := v.clientSet.CoreV1().PersistentVolumeClaims(apiv1.NamespaceDefault).Get(context.TODO(), v.pvc.Name, metav1.GetOptions{}) + if err != nil { + return nil, err + } + v.pvc = result + return ToVolumeResource(result) +} + +func (v *VolumeClientSet) UpdateResource() error { + fmt.Println("Volume update is not implemented") + return nil +} + +func (v *VolumeClientSet) DeleteResource() error { + err := v.clientSet.CoreV1().PersistentVolumeClaims(apiv1.NamespaceDefault).Delete(context.TODO(), v.pvc.Name, metav1.DeleteOptions{}) + if err != nil { + return err + } + fmt.Println("Volume deleted") + return nil +} + +type DeploymentControllerClient struct { + client client.Client + deployment *appsv1.Deployment +} + +func (d *DeploymentControllerClient) CreateResource() error { + return d.client.Create(context.TODO(), d.deployment) +} + +func (d *DeploymentControllerClient) GetResource() (*Resource, error) { + deployment := &appsv1.Deployment{} + err := d.client.Get(context.TODO(), client.ObjectKey{ + Namespace: apiv1.NamespaceDefault, + Name: d.deployment.Name, + }, deployment) + if err != nil { + return nil, err + } + d.deployment = deployment + return ToDeploymentResource(deployment) +} + +func (d *DeploymentControllerClient) UpdateResource() error { + deployment := &appsv1.Deployment{} + err := d.client.Get(context.TODO(), client.ObjectKey{ + Namespace: apiv1.NamespaceDefault, + Name: d.deployment.Name, + }, deployment) + if err != nil { + return err + } + deployment.Spec.Replicas = int32Ptr(1) + err = d.client.Update(context.TODO(), deployment) + if err != nil { + return err + } + return nil +} + +func (d *DeploymentControllerClient) DeleteResource() error { + return d.client.Delete(context.TODO(), d.deployment) +} + +type ServiceControllerClient struct { + client client.Client + service *apiv1.Service +} + +func (s *ServiceControllerClient) CreateResource() error { + return s.client.Create(context.TODO(), s.service) +} + +func (s *ServiceControllerClient) GetResource() (*Resource, error) { + service := &apiv1.Service{} + err := s.client.Get(context.TODO(), client.ObjectKey{ + Namespace: apiv1.NamespaceDefault, + Name: s.service.Name, + }, service) + if err != nil { + return nil, err + } + s.service = service + return ToServiceResource(service) +} + +func (s *ServiceControllerClient) UpdateResource() error { + fmt.Println("Service update is not implemented") + return nil +} + +func (s *ServiceControllerClient) DeleteResource() error { + return s.client.Delete(context.TODO(), s.service) +} + +type VolumeControllerClient struct { + client client.Client + pvc *apiv1.PersistentVolumeClaim +} + +func (v *VolumeControllerClient) CreateResource() error { + return v.client.Create(context.TODO(), v.pvc) +} + +func (v *VolumeControllerClient) GetResource() (*Resource, error) { + pvc := &apiv1.PersistentVolumeClaim{} + err := v.client.Get(context.TODO(), client.ObjectKey{ + Namespace: apiv1.NamespaceDefault, + Name: v.pvc.Name, + }, pvc) + if err != nil { + return nil, err + } + v.pvc = pvc + return ToVolumeResource(pvc) +} + +func (v *VolumeControllerClient) UpdateResource() error { + fmt.Println("Volume update is not implemented") + return nil +} + +func (v *VolumeControllerClient) DeleteResource() error { + return v.client.Delete(context.TODO(), v.pvc) +} + +type ConfigType int + +const ( + InCluster ConfigType = iota + BuildConfig +) + +func GetConfig(configType ConfigType) (*rest.Config, error) { + switch configType { + case BuildConfig: + var kubeconfig *string + if home := homedir.HomeDir(); home != "" { + kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file") + } else { + kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file") + } + flag.Parse() + + return clientcmd.BuildConfigFromFlags("", *kubeconfig) + case InCluster: + return rest.InClusterConfig() + default: + return nil, errors.New("invalid config type") + } +} + +func main() { + // Toggle between client-go and controller-runtime based on environment variable + useControllerRuntime := os.Getenv("USE_CONTROLLER_RUNTIME") == "true" + + configType := BuildConfig // or InCluster, depending on environment + config, err := GetConfig(configType) + if err != nil { + log.Fatalf("Failed to get kube config: %v", err) + } + + var clients []K8sClient + + // Initialize objects for Deployment, Service, and Volume + deployment := &appsv1.Deployment{ + ObjectMeta: metav1.ObjectMeta{ + Name: "nginx-deployment", + Namespace: apiv1.NamespaceDefault, + }, + Spec: appsv1.DeploymentSpec{ + Replicas: int32Ptr(2), + Selector: &metav1.LabelSelector{ + MatchLabels: map[string]string{ + "app": "nginx", + }, + }, + Template: apiv1.PodTemplateSpec{ + ObjectMeta: metav1.ObjectMeta{ + Labels: map[string]string{ + "app": "nginx", + }, + }, + Spec: apiv1.PodSpec{ + Containers: []apiv1.Container{ + { + Name: "nginx", + Image: "nginx:1.14.2", + Ports: []apiv1.ContainerPort{ + { + Name: "http", + Protocol: apiv1.ProtocolTCP, + ContainerPort: 80, + }, + }, + }, + }, + }, + }, + }, + } + + service := &apiv1.Service{ + ObjectMeta: metav1.ObjectMeta{ + Name: "nginx-service", + Namespace: apiv1.NamespaceDefault, + }, + Spec: apiv1.ServiceSpec{ + Selector: map[string]string{ + "app": "nginx", + }, + Ports: []apiv1.ServicePort{ + { + Name: "http", + Port: 80, + TargetPort: intstr.FromInt32(80), + }, + }, + Type: apiv1.ServiceTypeClusterIP, + }, + } + + pvc := &apiv1.PersistentVolumeClaim{ + ObjectMeta: metav1.ObjectMeta{ + Name: "nginx-pvc", + Namespace: apiv1.NamespaceDefault, + }, + Spec: apiv1.PersistentVolumeClaimSpec{ + AccessModes: []apiv1.PersistentVolumeAccessMode{ + apiv1.ReadWriteOnce, + }, + Resources: apiv1.VolumeResourceRequirements{ + Requests: apiv1.ResourceList{ + apiv1.ResourceStorage: resource.MustParse("1Gi"), + }, + }, + }, + } + + if useControllerRuntime { + // Initialize controller-runtime based client + fmt.Println("Using controller-runtime client") + + // Controller-runtime client initialization + ctrlClient, err := client.New(config, client.Options{}) + if err != nil { + log.Fatalf("Failed to create controller-runtime client: %v", err) + } + + // Add controller-runtime clients to the slice + clients = append(clients, &DeploymentControllerClient{client: ctrlClient, deployment: deployment}) + clients = append(clients, &ServiceControllerClient{client: ctrlClient, service: service}) + clients = append(clients, &VolumeControllerClient{client: ctrlClient, pvc: pvc}) + + } else { + // Initialize client-go based client + fmt.Println("Using client-go client") + clientset, err := kubernetes.NewForConfig(config) + if err != nil { + log.Fatalf("Failed to create clientset: %v", err) + } + + // Add client-go clients to the slice + clients = append(clients, &DeploymentClientSet{clientSet: clientset, deployment: deployment}) + clients = append(clients, &ServiceClientSet{clientSet: clientset, service: service}) + clients = append(clients, &VolumeClientSet{clientSet: clientset, pvc: pvc}) + } + + // Perform CRUD operations in sequence + for _, k8sClient := range clients { + // Create Resource + err := k8sClient.CreateResource() + if err != nil { + log.Fatalf("Failed to create resource: %v", err) + } + } + + for _, k8sClient := range clients { + err = waitForResourceToBeReady(k8sClient, 10) + if err != nil { + log.Fatal(err) + } + + // Update Resource + err = k8sClient.UpdateResource() + if err != nil { + log.Fatalf("Failed to update resource: %v", err) + } + } + + for _, k8sClient := range clients { + err = waitForResourceToBeReady(k8sClient, 10) + if err != nil { + log.Fatal(err) + } + err = k8sClient.DeleteResource() + if err != nil { + log.Fatalf("Failed to delete resource: %v", err) + } + } +} + +func waitForResourceToBeReady(client K8sClient, retries int) error { + for retries > 0 { + res, err := client.GetResource() + if err != nil { + return err + } + + if res.ready { + return nil + } + + fmt.Printf("Checking if resource %s is ready...", res.name) + time.Sleep(10 * time.Second) // Adjust the interval as necessary + retries-- + } + return errors.New("retry Time Out, resource create/update took longer than expected time") +}