JenkinsImage controller based on kaniko (#394)

pkg/controller/jenkinsimage/jenkinsimage_controller.go

@@ -0,0 +1,150 @@
+package jenkinsimage
+
+import (
+	"context"
+
+	jenkinsv1alpha2 "github.com/jenkinsci/kubernetes-operator/pkg/apis/jenkins/v1alpha2"
+
+	"github.com/jenkinsci/kubernetes-operator/pkg/configuration/base/resources"
+
+	"github.com/pkg/errors"
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	logf "sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+)
+
+var log = logf.Log.WithName("controller_jenkinsimage")
+
+// Add creates a new JenkinsImage Controller and adds it to the Manager. The Manager will set fields on the Controller
+// and Start it when the Manager is Started.
+func Add(mgr manager.Manager) error {
+	r := &ReconcileJenkinsImage{client: mgr.GetClient(), scheme: mgr.GetScheme()}
+	return add(mgr, r)
+}
+
+// add adds a new Controller to mgr with r as the reconcile.Reconciler
+func add(mgr manager.Manager, r reconcile.Reconciler) error {
+	// Create a new controller
+	c, err := controller.New("jenkinsimage-controller", mgr, controller.Options{Reconciler: r})
+	if err != nil {
+		return err
+	}
+
+	// Watch for changes to primary resource JenkinsImage
+	eventHandlerForObject := &handler.EnqueueRequestForObject{}
+	src := &source.Kind{Type: &jenkinsv1alpha2.JenkinsImage{}}
+	err = c.Watch(src, eventHandlerForObject)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	// Watch for changes to secondary resource Pods and requeue the owner JenkinsImage
+	eventHandlerForOwner := &handler.EnqueueRequestForOwner{
+		IsController: true,
+		OwnerType:    &jenkinsv1alpha2.JenkinsImage{},
+	}
+	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, eventHandlerForOwner)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	// Watch for changes to secondary ConfigMap and requeue the owner JenkinsImage
+	err = c.Watch(&source.Kind{Type: &corev1.ConfigMap{}}, eventHandlerForOwner)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	return nil
+}
+
+// blank assignment to verify that ReconcileJenkinsImage implements reconcile.Reconciler
+var _ reconcile.Reconciler = &ReconcileJenkinsImage{}
+
+// ReconcileJenkinsImage reconciles a JenkinsImage object
+type ReconcileJenkinsImage struct {
+	// This client, initialized using mgr.Client() above, is a split client
+	// that reads objects from the cache and writes to the apiserver
+	client client.Client
+	scheme *runtime.Scheme
+}
+
+// Reconcile reads that state of the cluster for a JenkinsImage object and makes changes based on the state read
+// and what is in the JenkinsImage.Spec
+// The Controller will requeue the Request to be processed again if the returned error is non-nil or
+// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
+func (r *ReconcileJenkinsImage) Reconcile(request reconcile.Request) (reconcile.Result, error) {
+	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
+	reqLogger.Info("Reconciling JenkinsImage")
+
+	// Fetch the JenkinsImage instance
+	instance := &jenkinsv1alpha2.JenkinsImage{}
+	err := r.client.Get(context.TODO(), request.NamespacedName, instance)
+	if err != nil {
+		if apierrors.IsNotFound(err) {
+			// Request object not found, could have been deleted after reconcile request.
+			// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
+			// Return and don't requeue
+			return reconcile.Result{}, nil
+		}
+		// Error reading the object - requeue the request.
+		return reconcile.Result{}, err
+	}
+
+	// Define a new ConfigMap containing the Dockerfile used to build the image
+	dockerfile := resources.NewDockerfileConfigMap(instance)
+	// Set JenkinsImage instance as the owner and controller
+	if err := controllerutil.SetControllerReference(instance, dockerfile, r.scheme); err != nil {
+		return reconcile.Result{}, err
+	}
+
+	// Check if this ConfigMap already exists
+	foundConfigMap := &corev1.ConfigMap{}
+	err = r.client.Get(context.TODO(), types.NamespacedName{Name: dockerfile.Name, Namespace: dockerfile.Namespace}, foundConfigMap)
+	if err != nil && apierrors.IsNotFound(err) {
+		reqLogger.Info("Creating a new ConfigMap", "ConfigMap.Namespace", dockerfile.Namespace, "ConfigMap.Name", dockerfile.Name)
+		err = r.client.Create(context.TODO(), dockerfile)
+		if err != nil {
+			return reconcile.Result{}, err
+		}
+		// ConfigMap created successfully - don't requeue
+		return reconcile.Result{}, nil
+	} else if err != nil {
+		return reconcile.Result{}, err
+	}
+	// ConfigMap already exists - don't requeue
+	reqLogger.Info("Skip reconcile: ConfigMap already exists", "ConfigMap.Namespace", foundConfigMap.Namespace, "ConfigMap.Name", foundConfigMap.Name)
+
+	// Define a new Pod object
+	pod := resources.NewBuilderPod(instance)
+	// Set JenkinsImage instance as the owner and controller
+	if err := controllerutil.SetControllerReference(instance, pod, r.scheme); err != nil {
+		return reconcile.Result{}, err
+	}
+
+	// Check if this Pod already exists
+	foundPod := &corev1.Pod{}
+	err = r.client.Get(context.TODO(), types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}, foundPod)
+	if err != nil && apierrors.IsNotFound(err) {
+		reqLogger.Info("Creating a new Pod", "Pod.Namespace", pod.Namespace, "Pod.Name", pod.Name)
+		err = r.client.Create(context.TODO(), pod)
+		if err != nil {
+			return reconcile.Result{}, err
+		}
+
+		// Pod created successfully - don't requeue
+		return reconcile.Result{}, nil
+	} else if err != nil {
+		return reconcile.Result{}, err
+	}
+	// Pod already exists - don't requeue
+	reqLogger.Info("Skip reconcile: Pod already exists", "Pod.Namespace", foundPod.Namespace, "Pod.Name", foundPod.Name)
+
+	return reconcile.Result{}, nil
+}