omit nil check

README.md

@@ -114,7 +114,10 @@ limitations under the License.
 
 ## What have I done?
 
-Source: https://shahin-mahmud.medium.com/write-your-first-kubernetes-operator-in-go-177047337eae
+Source: 
+Blog - https://shahin-mahmud.medium.com/write-your-first-kubernetes-operator-in-go-177047337eae
+Repo - https://github.com/BackAged/tdset-operator
+
 
 1. Initialize project
 operator-sdk init --domain rs --repo github.com/baschno/tdset-operator --plugins=go/v4

internal/controller/deployment.go

@@ -0,0 +1,214 @@
+package controller
+
+import (
+	"context"
+	"fmt"
+
+	schedulev1 "github.com/baschno/tdset-operator/api/v1"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+)
+
+func (r *TDSetReconciler) Deployment(
+	ctx context.Context, req ctrl.Request, tdSet *schedulev1.TDSet) (*appsv1.Deployment, error) {
+	// TODO: Implement the logic to get the deployment for the TDSet
+
+	log := log.FromContext(ctx)
+
+	replicas, err := r.GetExpectedReplica(ctx, req, tdSet)
+	if err != nil {
+		log.Error(err, "Failed to get expected replicas")
+		return nil, err
+	}
+
+	labels := map[string]string{
+		"app.kubernetes.io/name":       "TDSet",
+		"app.kubernetes.io/instance":   tdSet.Name,
+		"app.kubernetes.io/version":    "v1",
+		"app.kubernetes.io/part-of":    "tdset-operator",
+		"app.kubernetes.io/created-by": "controller-manager",
+	}
+
+	dep := &appsv1.Deployment{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      tdSet.Name,
+			Namespace: tdSet.Namespace,
+		},
+		Spec: appsv1.DeploymentSpec{
+			Replicas: &replicas,
+			Selector: &metav1.LabelSelector{
+				MatchLabels: labels,
+			},
+			Template: corev1.PodTemplateSpec{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: labels,
+				},
+				Spec: corev1.PodSpec{
+					Containers: []corev1.Container{{
+						Image:           tdSet.Spec.Container.Image,
+						Name:            tdSet.Name,
+						ImagePullPolicy: corev1.PullIfNotPresent,
+						Ports: []corev1.ContainerPort{{
+							ContainerPort: int32(tdSet.Spec.Container.Port),
+							Name:          "tdset",
+						}},
+					}},
+				},
+			},
+		},
+	}
+	// Set the ownerRef for the Deployment
+	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/owners-dependents/
+	if err := ctrl.SetControllerReference(tdSet, dep, r.Scheme); err != nil {
+		log.Error(err, "failed to set controller owner reference")
+		return nil, err
+	}
+
+	return dep, nil
+}
+func (r *TDSetReconciler) DeploymentIfNotExist(
+	ctx context.Context, req ctrl.Request,
+	tdSet *schedulev1.TDSet,
+) (bool, error) {
+	log := log.FromContext(ctx)
+
+	dep := &appsv1.Deployment{}
+
+	err := r.Get(ctx, types.NamespacedName{Name: tdSet.Name, Namespace: tdSet.Namespace}, dep)
+	if err != nil && apierrors.IsNotFound(err) {
+		dep, err := r.Deployment(ctx, req, tdSet)
+		if err != nil {
+			log.Error(err, "Failed to define new Deployment resource for TDSet")
+
+			err = r.SetCondition(
+				ctx, req, tdSet, TypeAvailable,
+				fmt.Sprintf("Failed to create Deployment for TDSet (%s): (%s)", tdSet.Name, err),
+			)
+			if err != nil {
+				return false, err
+			}
+		}
+
+		log.Info(
+			"Creating a new Deployment",
+			"Deployment.Namespace", dep.Namespace,
+			"Deployment.Name", dep.Name,
+		)
+
+		err = r.Create(ctx, dep)
+		if err != nil {
+			log.Error(
+				err, "Failed to create new Deployment",
+				"Deployment.Namespace", dep.Namespace,
+				"Deployment.Name", dep.Name,
+			)
+
+			return false, err
+		}
+
+		err = r.GetTDSet(ctx, req, tdSet)
+		if err != nil {
+			log.Error(err, "Failed to re-fetch TDSet")
+			return false, err
+		}
+
+		err = r.SetCondition(
+			ctx, req, tdSet, TypeProgressing,
+			fmt.Sprintf("Created Deployment for the TDSet: (%s)", tdSet.Name),
+		)
+		if err != nil {
+			return false, err
+		}
+
+		return true, nil
+	}
+
+	if err != nil {
+		log.Error(err, "Failed to get Deployment")
+
+		return false, err
+	}
+
+	return false, nil
+}
+
+func (r *TDSetReconciler) UpdateDeploymentReplica(
+	ctx context.Context, req ctrl.Request,
+	tdSet *schedulev1.TDSet,
+) error {
+	log := log.FromContext(ctx)
+
+	dep := &appsv1.Deployment{}
+
+	err := r.Get(ctx, types.NamespacedName{Name: tdSet.Name, Namespace: tdSet.Namespace}, dep)
+	if err != nil {
+		log.Error(err, "Failed to get Deployment")
+
+		return err
+	}
+
+	replicas, err := r.GetExpectedReplica(ctx, req, tdSet)
+	if err != nil {
+		log.Error(err, "failed to get expected replica")
+
+		return err
+	}
+
+	if replicas == *dep.Spec.Replicas {
+		return nil
+	}
+
+	log.Info(
+		"Updating a Deployment replica",
+		"Deployment.Namespace", dep.Namespace,
+		"Deployment.Name", dep.Name,
+	)
+
+	dep.Spec.Replicas = &replicas
+
+	err = r.Update(ctx, dep)
+	if err != nil {
+		log.Error(
+			err, "Failed to update Deployment",
+			"Deployment.Namespace", dep.Namespace,
+			"Deployment.Name", dep.Name,
+		)
+
+		err = r.GetTDSet(ctx, req, tdSet)
+		if err != nil {
+			log.Error(err, "Failed to re-fetch TDSet")
+			return err
+		}
+
+		err = r.SetCondition(
+			ctx, req, tdSet, TypeProgressing,
+			fmt.Sprintf("Failed to update replica for the TDSet (%s): (%s)", tdSet.Name, err),
+		)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+
+	err = r.GetTDSet(ctx, req, tdSet)
+	if err != nil {
+		log.Error(err, "Failed to re-fetch TDSet")
+		return err
+	}
+
+	err = r.SetCondition(
+		ctx, req, tdSet, TypeProgressing,
+		fmt.Sprintf("Updated replica for the TDSet (%s)", tdSet.Name),
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

internal/controller/schedule.go

@@ -0,0 +1,31 @@
+package controller
+
+import (
+	"context"
+	"time"
+
+	schedulev1 "github.com/baschno/tdset-operator/api/v1"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+)
+
+func (r *TDSetReconciler) GetExpectedReplica(ctx context.Context, req ctrl.Request, tdSet *schedulev1.TDSet) (int32, error) {
+
+	log := log.FromContext(ctx)
+
+	if len(tdSet.Spec.SchedulingConfig) != 0 {
+		now := time.Now()
+		hour := now.Hour()
+
+		log.Info("Current server", hour, "time", now)
+
+		for _, config := range tdSet.Spec.SchedulingConfig {
+			if hour >= config.StartTime && hour < config.EndTime {
+				return int32(config.Replicas), nil
+			}
+		}
+
+	}
+	log.Info("Default replicas is not set. Using 1 replica")
+	return tdSet.Spec.DefaultReplicas, nil
+}

internal/controller/tdset.go

@@ -0,0 +1,76 @@
+package controller
+
+import (
+	"context"
+
+	"sigs.k8s.io/controller-runtime/pkg/log"
+
+	schedulev1 "github.com/baschno/tdset-operator/api/v1"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	ctrl "sigs.k8s.io/controller-runtime"
+)
+
+// ConditionStatus defines TDSet condition status.
+type ConditionStatus string
+
+// Defines TDSet condition status.
+const (
+	TypeAvailable   ConditionStatus = "Available"
+	TypeProgressing ConditionStatus = "Progressing"
+	TypeDegraded    ConditionStatus = "Degraded"
+)
+
+// GetTDSet gets the TDSet from api server.
+func (r *TDSetReconciler) GetTDSet(ctx context.Context, req ctrl.Request, tdSet *schedulev1.TDSet) error {
+	err := r.Get(ctx, req.NamespacedName, tdSet)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// SetInitialCondition sets the status condition of the TDSet to available initially
+// when no condition exists yet.
+func (r *TDSetReconciler) SetInitialCondition(ctx context.Context, req ctrl.Request, tdSet *schedulev1.TDSet) error {
+	if tdSet.Status.Conditions != nil || len(tdSet.Status.Conditions) != 0 {
+		return nil
+	}
+
+	err := r.SetCondition(ctx, req, tdSet, TypeAvailable, "Starting reconciliation")
+
+	return err
+}
+
+// SetCondition sets the status condition of the TDSet.
+func (r *TDSetReconciler) SetCondition(
+	ctx context.Context, req ctrl.Request,
+	tdSet *schedulev1.TDSet, condition ConditionStatus,
+	message string,
+) error {
+	log := log.FromContext(ctx)
+
+	meta.SetStatusCondition(
+		&tdSet.Status.Conditions,
+		metav1.Condition{
+			Type:   string(condition),
+			Status: metav1.ConditionUnknown, Reason: "Reconciling",
+			Message: message,
+		},
+	)
+
+	if err := r.Status().Update(ctx, tdSet); err != nil {
+		log.Error(err, "Failed to update TDSet status")
+
+		return err
+	}
+
+	if err := r.Get(ctx, req.NamespacedName, tdSet); err != nil {
+		log.Error(err, "Failed to re-fetch TDSet")
+
+		return err
+	}
+
+	return nil
+}

internal/controller/tdset_controller.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"time"
 
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/runtime"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"