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feat(ingress): Watch ingresses and create monitor when annotations match
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,229 @@ | ||
| /* | ||
| Copyright 2024. | ||
| 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 controller | ||
|
|
||
| import ( | ||
| "context" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| uptimerobotv1 "github.com/clevyr/uptime-robot-operator/api/v1" | ||
| "github.com/mitchellh/mapstructure" | ||
| corev1 "k8s.io/api/core/v1" | ||
| networkingv1 "k8s.io/api/networking/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/fields" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil" | ||
| "sigs.k8s.io/controller-runtime/pkg/log" | ||
| ) | ||
|
|
||
| const AnnotationPrefix = "uptime-robot.clevyr.com/" | ||
|
|
||
| // IngressReconciler reconciles a Ingress object | ||
| type IngressReconciler struct { | ||
| client.Client | ||
| Scheme *runtime.Scheme | ||
| } | ||
|
|
||
| //+kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses,verbs=get;list;watch;create;update;patch;delete | ||
| //+kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses/status,verbs=get;update;patch | ||
| //+kubebuilder:rbac:groups=networking.k8s.io,resources=ingresses/finalizers,verbs=update | ||
|
|
||
| // Reconcile is part of the main kubernetes reconciliation loop which aims to | ||
| // move the current state of the cluster closer to the desired state. | ||
| // | ||
| // For more details, check Reconcile and its Result here: | ||
| // - https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/reconcile | ||
| func (r *IngressReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { | ||
| _ = log.FromContext(ctx) | ||
|
|
||
| ingress := &networkingv1.Ingress{} | ||
| if err := r.Get(ctx, req.NamespacedName, ingress); err != nil { | ||
| return ctrl.Result{}, client.IgnoreNotFound(err) | ||
| } | ||
|
|
||
| list, err := r.findMonitors(ctx, ingress) | ||
| if err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
|
|
||
| const myFinalizerName = "uptime-robot.clevyr.com/finalizer" | ||
| if !ingress.DeletionTimestamp.IsZero() { | ||
| // Object is being deleted | ||
| if controllerutil.ContainsFinalizer(ingress, myFinalizerName) { | ||
| for _, monitor := range list.Items { | ||
| if err := r.Delete(ctx, &monitor); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
|
|
||
| controllerutil.RemoveFinalizer(ingress, myFinalizerName) | ||
| if err := r.Update(ctx, ingress); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
|
|
||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
||
| annotationCount := r.countMatchingAnnotations(ingress) | ||
| var create bool | ||
| if annotationCount == 0 { | ||
| if len(list.Items) != 0 { | ||
| // Delete existing Monitor | ||
| for _, monitor := range list.Items { | ||
| if err := r.Delete(ctx, &monitor); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
|
|
||
| if controllerutil.ContainsFinalizer(ingress, myFinalizerName) { | ||
| for _, monitor := range list.Items { | ||
| if err := r.Delete(ctx, &monitor); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
|
|
||
| controllerutil.RemoveFinalizer(ingress, myFinalizerName) | ||
| if err := r.Update(ctx, ingress); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
| return ctrl.Result{}, nil | ||
| } | ||
| } else { | ||
| if len(list.Items) == 0 { | ||
| // Create new Monitor | ||
| create = true | ||
| list.Items = append(list.Items, uptimerobotv1.Monitor{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: ingress.Name, | ||
| Namespace: req.Namespace, | ||
| }, | ||
| Spec: uptimerobotv1.MonitorSpec{ | ||
| SourceRef: &corev1.TypedLocalObjectReference{ | ||
| Kind: ingress.Kind, | ||
| Name: ingress.Name, | ||
| }, | ||
| }, | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| annotations := r.getMatchingAnnotations(ingress) | ||
| for _, monitor := range list.Items { | ||
| if err := r.updateValues(ingress, &monitor, annotations); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
|
|
||
| if create { | ||
| if err := r.Create(ctx, &monitor); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } else { | ||
| if err := r.Update(ctx, &monitor); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if !controllerutil.ContainsFinalizer(ingress, myFinalizerName) { | ||
| controllerutil.AddFinalizer(ingress, myFinalizerName) | ||
| if err := r.Update(ctx, ingress); err != nil { | ||
| return ctrl.Result{}, err | ||
| } | ||
| } | ||
| return ctrl.Result{}, nil | ||
| } | ||
|
|
||
| // SetupWithManager sets up the controller with the Manager. | ||
| func (r *IngressReconciler) SetupWithManager(mgr ctrl.Manager) error { | ||
| return ctrl.NewControllerManagedBy(mgr). | ||
| For(&networkingv1.Ingress{}). | ||
| Complete(r) | ||
| } | ||
|
|
||
| func (r *IngressReconciler) findMonitors(ctx context.Context, ingress *networkingv1.Ingress) (*uptimerobotv1.MonitorList, error) { | ||
| list := &uptimerobotv1.MonitorList{} | ||
| err := r.Client.List(ctx, list, &client.ListOptions{ | ||
| FieldSelector: fields.OneTermEqualSelector("spec.sourceRef", ingress.Kind+"/"+ingress.Name), | ||
| }) | ||
| if err != nil { | ||
| return list, err | ||
| } | ||
| return list, nil | ||
| } | ||
|
|
||
| func (r *IngressReconciler) countMatchingAnnotations(ingress *networkingv1.Ingress) uint { | ||
| var count uint | ||
| for k := range ingress.Annotations { | ||
| if strings.HasPrefix(k, AnnotationPrefix) { | ||
| count++ | ||
| } | ||
| } | ||
| return count | ||
| } | ||
|
|
||
| func (r *IngressReconciler) getMatchingAnnotations(ingress *networkingv1.Ingress) map[string]string { | ||
| annotations := make(map[string]string, r.countMatchingAnnotations(ingress)) | ||
| for k, v := range ingress.Annotations { | ||
| if strings.HasPrefix(k, AnnotationPrefix) { | ||
| annotations[strings.TrimPrefix(k, AnnotationPrefix)] = v | ||
| } | ||
| } | ||
| return annotations | ||
| } | ||
|
|
||
| func (r *IngressReconciler) updateValues(ingress *networkingv1.Ingress, monitor *uptimerobotv1.Monitor, annotations map[string]string) error { | ||
| monitor.Spec.Monitor.FriendlyName = ingress.Name | ||
| if _, ok := annotations["monitor.url"]; !ok { | ||
| if len(ingress.Spec.Rules) != 0 { | ||
| var u url.URL | ||
| if u.Scheme, ok = annotations["monitor.scheme"]; !ok { | ||
| if len(ingress.Spec.TLS) == 0 { | ||
| u.Scheme = "http" | ||
| } else { | ||
| u.Scheme = "https" | ||
| } | ||
| } | ||
| rule := ingress.Spec.Rules[0] | ||
| if u.Host, ok = annotations["monitor.host"]; !ok { | ||
| u.Host = rule.Host | ||
| } | ||
| if u.Path, ok = annotations["monitor.path"]; !ok && len(rule.HTTP.Paths) != 0 { | ||
| if path := rule.HTTP.Paths[0].Path; path != "/" { | ||
| u.Path = path | ||
| } | ||
| } | ||
| monitor.Spec.Monitor.URL = u.String() | ||
| } | ||
| } | ||
|
|
||
| dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{ | ||
| TagName: "json", | ||
| WeaklyTypedInput: true, | ||
| Result: &monitor.Spec, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return dec.Decode(annotations) | ||
| } |
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