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application_deployable.go
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/
application_deployable.go
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// Copyright 2019 The Kubernetes Authors.
//
// 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 application
import (
"context"
"encoding/json"
sigappv1beta1 "github.com/kubernetes-sigs/application/pkg/apis/app/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
clusterv1alpha1 "k8s.io/cluster-registry/pkg/apis/clusterregistry/v1alpha1"
"k8s.io/klog"
"sigs.k8s.io/controller-runtime/pkg/client"
hdplv1alpha1 "github.com/hybridapp-io/ham-deployable-operator/pkg/apis/core/v1alpha1"
dplv1 "github.com/open-cluster-management/multicloud-operators-deployable/pkg/apis/apps/v1"
)
// Locates a deployable wrapping an application in a mnaged cluster nanespace
func (r *ReconcileApplication) locateAppDeployable(appKey types.NamespacedName, namespace string) (*dplv1.Deployable, error) {
dpllist := &dplv1.DeployableList{}
err := r.List(context.TODO(), dpllist, client.InNamespace(namespace))
if err != nil {
klog.Error("Failed to retrieve the list of deployables with error:", err)
return nil, err
}
for _, dpl := range dpllist.Items {
// source annotation is not powerful enough, we need to get deployables with a specific template type
templateobj := &unstructured.Unstructured{}
err = json.Unmarshal(dpl.Spec.Template.Raw, templateobj)
if err != nil {
klog.Info("Failed to unmarshal object with error", err)
return nil, err
}
if templateobj.GetKind() != applicationGVK.Kind {
continue
}
annotations := dpl.GetAnnotations()
if srcobj, ok := annotations[hdplv1alpha1.SourceObject]; ok {
if srcobj == appKey.String() {
return dpl.DeepCopy(), nil
}
}
}
return nil, nil
}
// This function will reconcile the app deployable in all managed namespaces .
// Each managed cluster namespace will have its own app deployable which will be in charge
// of discovering the app components in that respective managed cluster
func (r *ReconcileApplication) reconcileAppDeployables(app *sigappv1beta1.Application) error {
// retrieve a list of clusters
clusterList := &clusterv1alpha1.ClusterList{}
err := r.List(context.TODO(), clusterList)
if err != nil {
klog.Error("Failed to retrieve the list of managed clusters ")
return err
}
for _, cluster := range clusterList.Items {
err = r.reconcileAppDeployable(app, cluster.Namespace)
if err != nil {
klog.Error("Failed to reconcile the application deployable in managed cluster namespace: ", cluster.Namespace)
return err
}
}
return nil
}
func (r *ReconcileApplication) deleteApplicationDeployables(appKey types.NamespacedName) error {
// retrieve a list of clusters
clusterList := &clusterv1alpha1.ClusterList{}
err := r.List(context.TODO(), clusterList)
if err != nil {
klog.Error("Failed to retrieve the list of managed clusters ")
return err
}
for _, cluster := range clusterList.Items {
dpl, err := r.locateAppDeployable(appKey, cluster.Namespace)
if err != nil {
klog.Error("Failed to locate application deployable with error: ", err)
return err
}
if dpl != nil {
err = r.Delete(context.TODO(), dpl)
if err != nil {
klog.Error("Failed to delete application deployable ", dpl.Namespace+"/"+dpl.Name+" with error:", err)
}
}
}
return nil
}
func (r *ReconcileApplication) reconcileAppDeployable(app *sigappv1beta1.Application, namespace string) error {
appKey := types.NamespacedName{
Name: app.Name,
Namespace: app.Namespace,
}
dpl, err := r.locateAppDeployable(appKey, namespace)
if err != nil {
klog.Error("Failed to locate application deployable with error: ", err)
return err
}
if dpl == nil {
dpl = &dplv1.Deployable{}
dpl.GenerateName = r.generateName(app.GetName())
dpl.Namespace = namespace
}
tplApp := app.DeepCopy()
r.prepareDeployable(dpl, tplApp)
r.prepareTemplate(tplApp, app.Namespace)
dpl.Spec.Template = &runtime.RawExtension{
Object: tplApp,
}
if dpl.UID == "" {
err = r.Create(context.TODO(), dpl)
} else {
err = r.Update(context.TODO(), dpl)
}
if err != nil {
klog.Error("Failed to reconcile app deployable with error: ", err)
return err
}
return nil
}
func (r *ReconcileApplication) prepareDeployable(deployable *dplv1.Deployable, app *sigappv1beta1.Application) {
labels := deployable.GetLabels()
if labels == nil {
labels = make(map[string]string)
}
for key, value := range app.GetLabels() {
labels[key] = value
}
deployable.SetLabels(labels)
annotations := deployable.GetAnnotations()
if annotations == nil {
annotations = make(map[string]string)
}
annotations[hdplv1alpha1.SourceObject] = types.NamespacedName{Namespace: app.GetNamespace(), Name: app.GetName()}.String()
deployable.SetAnnotations(annotations)
}
func (r *ReconcileApplication) prepareTemplate(app *sigappv1beta1.Application, namespace string) {
var emptyuid types.UID
app.SetUID(emptyuid)
app.SetSelfLink("")
app.SetResourceVersion("")
app.SetGeneration(0)
app.SetCreationTimestamp(metav1.Time{})
app.SetNamespace(namespace)
app.SetOwnerReferences(nil)
}