246 lines
7.9 KiB
Go
246 lines
7.9 KiB
Go
// Copyright 2020 The Kubernetes Authors.
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// SPDX-License-Identifier: Apache-2.0
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package controllers
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import (
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"context"
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"fmt"
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"github.com/go-logr/logr"
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"k8s.io/apimachinery/pkg/api/equality"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/types"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/client-go/util/retry"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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appv1beta1 "sigs.k8s.io/application/api/v1beta1"
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)
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const (
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loggerCtxKey = "logger"
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)
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// ApplicationReconciler reconciles a Application object
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type ApplicationReconciler struct {
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client.Client
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Mapper meta.RESTMapper
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Log logr.Logger
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Scheme *runtime.Scheme
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}
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// +kubebuilder:rbac:groups=app.k8s.io,resources=applications,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=app.k8s.io,resources=applications/status,verbs=get;update;patch
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// +kubebuilder:rbac:groups=*,resources=*,verbs=list;get;update;patch;watch
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func (r *ApplicationReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
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rootCtx := context.Background()
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logger := r.Log.WithValues("application", req.NamespacedName)
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ctx := context.WithValue(rootCtx, loggerCtxKey, logger)
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var app appv1beta1.Application
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err := r.Get(ctx, req.NamespacedName, &app)
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if err != nil {
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if apierrors.IsNotFound(err) {
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return ctrl.Result{}, nil
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}
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return ctrl.Result{}, err
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}
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// Application is in the process of being deleted, so no need to do anything.
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if app.DeletionTimestamp != nil {
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return ctrl.Result{}, nil
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}
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resources, errs := r.updateComponents(ctx, &app)
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newApplicationStatus := r.getNewApplicationStatus(ctx, &app, resources, &errs)
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newApplicationStatus.ObservedGeneration = app.Generation
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if equality.Semantic.DeepEqual(newApplicationStatus, &app.Status) {
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return ctrl.Result{}, nil
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}
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err = r.updateApplicationStatus(ctx, req.NamespacedName, newApplicationStatus)
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return ctrl.Result{}, err
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}
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func (r *ApplicationReconciler) updateComponents(ctx context.Context, app *appv1beta1.Application) ([]*unstructured.Unstructured, []error) {
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var errs []error
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resources := r.fetchComponentListResources(ctx, app.Spec.ComponentGroupKinds, app.Spec.Selector, app.Namespace, &errs)
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if app.Spec.AddOwnerRef {
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ownerRef := metav1.NewControllerRef(app, appv1beta1.GroupVersion.WithKind("Application"))
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*ownerRef.Controller = false
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if err := r.setOwnerRefForResources(ctx, *ownerRef, resources); err != nil {
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errs = append(errs, err)
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}
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}
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return resources, errs
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}
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func (r *ApplicationReconciler) getNewApplicationStatus(ctx context.Context, app *appv1beta1.Application, resources []*unstructured.Unstructured, errList *[]error) *appv1beta1.ApplicationStatus {
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objectStatuses := r.objectStatuses(ctx, resources, errList)
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errs := utilerrors.NewAggregate(*errList)
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aggReady, countReady := aggregateReady(objectStatuses)
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newApplicationStatus := app.Status.DeepCopy()
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newApplicationStatus.ComponentList = appv1beta1.ComponentList{
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Objects: objectStatuses,
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}
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newApplicationStatus.ComponentsReady = fmt.Sprintf("%d/%d", countReady, len(objectStatuses))
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if errs != nil {
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setReadyUnknownCondition(newApplicationStatus, "ComponentsReadyUnknown", "failed to aggregate all components' statuses, check the Error condition for details")
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} else if aggReady {
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setReadyCondition(newApplicationStatus, "ComponentsReady", "all components ready")
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} else {
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setNotReadyCondition(newApplicationStatus, "ComponentsNotReady", fmt.Sprintf("%d components not ready", len(objectStatuses)-countReady))
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}
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if errs != nil {
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setErrorCondition(newApplicationStatus, "ErrorSeen", errs.Error())
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} else {
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clearErrorCondition(newApplicationStatus)
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}
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return newApplicationStatus
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}
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func (r *ApplicationReconciler) fetchComponentListResources(ctx context.Context, groupKinds []metav1.GroupKind, selector *metav1.LabelSelector, namespace string, errs *[]error) []*unstructured.Unstructured {
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logger := getLoggerOrDie(ctx)
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var resources []*unstructured.Unstructured
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if selector == nil {
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logger.Info("No selector is specified")
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return resources
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}
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for _, gk := range groupKinds {
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mapping, err := r.Mapper.RESTMapping(schema.GroupKind{
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Group: appv1beta1.StripVersion(gk.Group),
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Kind: gk.Kind,
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})
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if err != nil {
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logger.Info("NoMappingForGK", "gk", gk.String())
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continue
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}
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list := &unstructured.UnstructuredList{}
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list.SetGroupVersionKind(mapping.GroupVersionKind)
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if err = r.Client.List(ctx, list, client.InNamespace(namespace), client.MatchingLabels(selector.MatchLabels)); err != nil {
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logger.Error(err, "unable to list resources for GVK", "gvk", mapping.GroupVersionKind)
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*errs = append(*errs, err)
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continue
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}
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for _, u := range list.Items {
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resource := u
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resources = append(resources, &resource)
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}
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}
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return resources
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}
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func (r *ApplicationReconciler) setOwnerRefForResources(ctx context.Context, ownerRef metav1.OwnerReference, resources []*unstructured.Unstructured) error {
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logger := getLoggerOrDie(ctx)
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for _, resource := range resources {
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ownerRefs := resource.GetOwnerReferences()
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ownerRefFound := false
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for i, refs := range ownerRefs {
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if ownerRef.Kind == refs.Kind &&
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ownerRef.APIVersion == refs.APIVersion &&
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ownerRef.Name == refs.Name {
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ownerRefFound = true
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if ownerRef.UID != refs.UID {
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ownerRefs[i] = ownerRef
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}
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}
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}
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if !ownerRefFound {
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ownerRefs = append(ownerRefs, ownerRef)
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}
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resource.SetOwnerReferences(ownerRefs)
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err := r.Client.Update(ctx, resource)
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if err != nil {
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// We log this error, but we continue and try to set the ownerRefs on the other resources.
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logger.Error(err, "ErrorSettingOwnerRef", "gvk", resource.GroupVersionKind().String(),
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"namespace", resource.GetNamespace(), "name", resource.GetName())
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}
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}
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return nil
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}
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func (r *ApplicationReconciler) objectStatuses(ctx context.Context, resources []*unstructured.Unstructured, errs *[]error) []appv1beta1.ObjectStatus {
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logger := getLoggerOrDie(ctx)
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var objectStatuses []appv1beta1.ObjectStatus
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for _, resource := range resources {
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os := appv1beta1.ObjectStatus{
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Group: resource.GroupVersionKind().Group,
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Kind: resource.GetKind(),
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Name: resource.GetName(),
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Link: resource.GetSelfLink(),
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}
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s, err := status(resource)
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if err != nil {
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logger.Error(err, "unable to compute status for resource", "gvk", resource.GroupVersionKind().String(),
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"namespace", resource.GetNamespace(), "name", resource.GetName())
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*errs = append(*errs, err)
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}
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os.Status = s
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objectStatuses = append(objectStatuses, os)
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}
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return objectStatuses
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}
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func aggregateReady(objectStatuses []appv1beta1.ObjectStatus) (bool, int) {
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countReady := 0
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for _, os := range objectStatuses {
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if os.Status == StatusReady {
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countReady++
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}
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}
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if countReady == len(objectStatuses) {
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return true, countReady
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}
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return false, countReady
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}
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func (r *ApplicationReconciler) updateApplicationStatus(ctx context.Context, nn types.NamespacedName, status *appv1beta1.ApplicationStatus) error {
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if err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
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original := &appv1beta1.Application{}
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if err := r.Get(ctx, nn, original); err != nil {
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return err
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}
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original.Status = *status
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if err := r.Client.Status().Update(ctx, original); err != nil {
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return err
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}
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return nil
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}); err != nil {
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return fmt.Errorf("failed to update status of Application %s/%s: %v", nn.Namespace, nn.Name, err)
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}
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return nil
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}
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func (r *ApplicationReconciler) SetupWithManager(mgr ctrl.Manager) error {
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return ctrl.NewControllerManagedBy(mgr).
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For(&appv1beta1.Application{}).
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Complete(r)
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}
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func getLoggerOrDie(ctx context.Context) logr.Logger {
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logger, ok := ctx.Value(loggerCtxKey).(logr.Logger)
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if !ok {
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panic("context didn't contain logger")
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}
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return logger
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}
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