Initial import

controllers/entanglement_controller.go

@@ -0,0 +1,156 @@
+/*
+Copyright 2022.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controllers
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+
+	entanglev1alpha1 "github.com/c3os-io/entangle/api/v1alpha1"
+)
+
+// EntanglementReconciler reconciles a Entanglement object
+type EntanglementReconciler struct {
+	clientSet *kubernetes.Clientset
+	client.Client
+	Scheme               *runtime.Scheme
+	EntangleServiceImage string
+}
+
+//+kubebuilder:rbac:groups=entangle.c3os-x.io,resources=entanglements,verbs=get;list;watch;create;update;patch;delete
+//+kubebuilder:rbac:groups=entangle.c3os-x.io,resources=entanglements/status,verbs=get;update;patch
+//+kubebuilder:rbac:groups=entangle.c3os-x.io,resources=entanglements/finalizers,verbs=update
+//+kubebuilder:rbac:groups=apps,resources=deployments,verbs=get;list;watch;create;update;patch;delete
+//+kubebuilder:rbac:groups="",resources=secrets,verbs=create;get;list;watch
+//+kubebuilder:rbac:groups="",resources=services,verbs=create;get;list;watch
+
+// Reconcile is part of the main kubernetes reconciliation loop which aims to
+// move the current state of the cluster closer to the desired state.
+// TODO(user): Modify the Reconcile function to compare the state specified by
+// the Entanglement object against the actual cluster state, and then
+// perform operations to make the cluster state reflect the state specified by
+// the user.
+//
+// For more details, check Reconcile and its Result here:
+// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.12.1/pkg/reconcile
+func (r *EntanglementReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
+	logger := log.FromContext(ctx)
+
+	// Creates a deployment targeting a service
+	// TODO(user): your logic here
+	var ent entanglev1alpha1.Entanglement
+	if err := r.Get(ctx, req.NamespacedName, &ent); err != nil {
+		if apierrors.IsNotFound(err) {
+			return ctrl.Result{}, nil
+		}
+		return ctrl.Result{}, err
+	}
+
+	desiredDeployment, err := r.genDeployment(ent)
+	if err != nil {
+		return ctrl.Result{}, err
+	}
+
+	if ent.Spec.Inbound {
+		if ent.Spec.ServiceSpec == nil {
+			return ctrl.Result{Requeue: false}, fmt.Errorf("servicespec is required with an inbound connection")
+		}
+		svc := genService(ent)
+
+		sv, err := r.clientSet.CoreV1().Services(req.Namespace).Get(ctx, svc.Name, v1.GetOptions{})
+		if sv == nil || apierrors.IsNotFound(err) {
+			logger.Info(fmt.Sprintf("Creating Service %v", sv))
+
+			sv, err = r.clientSet.CoreV1().Services(req.Namespace).Create(ctx, svc, v1.CreateOptions{})
+			if err != nil {
+				logger.Error(err, "Failed while creating deployment")
+				return ctrl.Result{}, nil
+			}
+
+			return ctrl.Result{Requeue: true}, nil
+		}
+		if err != nil {
+			return ctrl.Result{Requeue: true}, err
+		}
+	}
+
+	deployment, err := r.clientSet.AppsV1().Deployments(req.Namespace).Get(ctx, desiredDeployment.Name, v1.GetOptions{})
+	if deployment == nil || apierrors.IsNotFound(err) {
+		logger.Info(fmt.Sprintf("Creating Deployment %v", deployment))
+
+		deployment, err = r.clientSet.AppsV1().Deployments(req.Namespace).Create(ctx, desiredDeployment, v1.CreateOptions{})
+		if err != nil {
+			logger.Error(err, "Failed while creating deployment")
+			return ctrl.Result{}, nil
+		}
+
+		return ctrl.Result{Requeue: true}, nil
+	}
+	if err != nil {
+		return ctrl.Result{Requeue: true}, err
+	}
+
+	// If args or env are missing, update it
+	if desiredDeployment.Spec.Template.Spec.Containers[0].Args[0] != deployment.Spec.Template.Spec.Containers[0].Args[0] ||
+		desiredDeployment.Spec.Template.Spec.Containers[0].Env[0] != deployment.Spec.Template.Spec.Containers[0].Env[0] {
+		deployment, err = r.clientSet.AppsV1().Deployments(req.Namespace).Update(ctx, desiredDeployment, v1.UpdateOptions{})
+		if err != nil {
+			logger.Error(err, "Failed while updating deployment")
+			return ctrl.Result{}, nil
+		}
+	}
+
+	return ctrl.Result{}, nil
+}
+
+// SetupWithManager sets up the controller with the Manager.
+func (r *EntanglementReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	clientset, err := kubernetes.NewForConfig(mgr.GetConfig())
+	if err != nil {
+		return err
+	}
+	r.clientSet = clientset
+
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&entanglev1alpha1.Entanglement{}).
+		Complete(r)
+}
+
+func genService(ent entanglev1alpha1.Entanglement) *corev1.Service {
+	objMeta := metav1.ObjectMeta{
+		Name:            ent.Name,
+		Namespace:       ent.Namespace,
+		OwnerReferences: genOwner(ent),
+	}
+
+	svc := ent.Spec.ServiceSpec
+	svc.Selector = genDeploymentLabel(ent.Name)
+	return &corev1.Service{
+		ObjectMeta: objMeta,
+		Spec:       *svc,
+	}
+}