/
globalsvc.go
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/
globalsvc.go
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/*
Copyright 2019 The Multicluster-Scheduler 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 globalsvc
import (
"context"
"fmt"
"admiralty.io/multicluster-controller/pkg/cluster"
"admiralty.io/multicluster-controller/pkg/controller"
"admiralty.io/multicluster-controller/pkg/patterns"
"admiralty.io/multicluster-controller/pkg/patterns/gc"
"admiralty.io/multicluster-controller/pkg/reconcile"
"admiralty.io/multicluster-controller/pkg/reference"
"admiralty.io/multicluster-scheduler/pkg/apis/multicluster/v1alpha1"
"admiralty.io/multicluster-scheduler/pkg/common"
schedulerconfig "admiralty.io/multicluster-scheduler/pkg/config/scheduler"
"github.com/go-test/deep"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func NewController(scheduler *cluster.Cluster, schedCfg *schedulerconfig.Config) (*controller.Controller, error) {
client, err := scheduler.GetDelegatingClient()
if err != nil {
return nil, fmt.Errorf("getting delegating client for scheduler cluster: %v", err)
}
co := controller.New(&reconciler{
client: client,
schedCfg: schedCfg,
}, controller.Options{})
if err := co.WatchResourceReconcileObjectOverrideContext(scheduler, &v1alpha1.ServiceObservation{}, controller.WatchOptions{
Namespaces: schedCfg.Namespaces,
CustomPredicate: func(obj interface{}) bool {
svcObs := obj.(*v1alpha1.ServiceObservation)
svc := svcObs.Status.LiveState
return svc.Annotations["io.cilium/global-service"] == "true" &&
svc.Labels[common.LabelKeyIsDelegate] != "true" // no need to globalyze a delegate service (result of other service's globalyzation)
},
}, ""); err != nil {
return nil, fmt.Errorf("setting up proxy service observation watch: %v", err)
}
if err := co.WatchResourceReconcileController(scheduler, &v1alpha1.ServiceDecision{}, controller.WatchOptions{
Namespaces: schedCfg.Namespaces,
}); err != nil {
return nil, fmt.Errorf("setting up delegate service decision watch: %v", err)
}
return co, nil
}
type reconciler struct {
client client.Client
schedCfg *schedulerconfig.Config
}
func (r *reconciler) Reconcile(req reconcile.Request) (reconcile.Result, error) {
svcObs := &v1alpha1.ServiceObservation{}
if err := r.client.Get(context.Background(), req.NamespacedName, svcObs); err != nil {
if !errors.IsNotFound(err) {
return reconcile.Result{}, fmt.Errorf("cannot get service observation %s in namespace %s: %v", req.Name, req.Namespace, err)
}
// ServiceObservation was deleted
return reconcile.Result{}, nil
}
svc := svcObs.Status.LiveState
srcClusterName := r.schedCfg.GetObservationClusterName(svcObs)
var clusters map[string]struct{}
fedName := svc.Annotations[common.AnnotationKeyFederationName]
if fedName == "" {
clusters = r.schedCfg.PairedClustersByCluster[srcClusterName]
} else {
clusters = r.schedCfg.ClustersByFederation[fedName]
}
for clusterName := range clusters {
if clusterName == srcClusterName {
continue
}
delSvc := makeDelegateService(svc)
svcDecNamespace := r.schedCfg.NamespaceForCluster[clusterName]
l := &v1alpha1.ServiceDecisionList{}
s := labels.SelectorFromValidatedSet(labels.Set{
gc.LabelParentName: svcObs.Name,
gc.LabelParentNamespace: svcObs.Namespace,
})
err := r.client.List(context.Background(), &client.ListOptions{Namespace: svcDecNamespace, LabelSelector: s}, l)
if err != nil {
return reconcile.Result{}, fmt.Errorf(
"cannot list service decisions in namespace %s with label selector %s: %v",
svcDecNamespace, s, err)
}
if len(l.Items) > 1 {
return reconcile.Result{}, fmt.Errorf(
"duplicate service decisions found in namespace %s with label selector %s: %v",
svcDecNamespace, s, err)
} else if len(l.Items) == 0 {
svcDec := &v1alpha1.ServiceDecision{}
// we use generate name to avoid (unlikely) conflicts
genName := fmt.Sprintf("%s-%s-", svcObs.Namespace, svcObs.Name)
if len(genName) > 253 {
genName = genName[0:253]
}
svcDec.GenerateName = genName
svcDec.Namespace = svcDecNamespace
svcDec.Labels = labels.Set{
gc.LabelParentName: svcObs.Name,
gc.LabelParentNamespace: svcObs.Namespace,
}
svcDec.Annotations = map[string]string{common.AnnotationKeyClusterName: clusterName}
svcDec.Spec.Template.ObjectMeta = delSvc.ObjectMeta
svcDec.Spec.Template.Spec = delSvc.Spec
ref := reference.NewMulticlusterOwnerReference(svcObs, svc.GroupVersionKind(), "")
if err := reference.SetMulticlusterControllerReference(svcDec, ref); err != nil {
return reconcile.Result{}, fmt.Errorf(
"cannot set controller reference on service decision %s (name not yet generated) "+
"in namespace %s for owner %s in namespace %s: %v",
genName, svcDecNamespace, svcObs.Name, svcObs.Namespace, err)
}
if err := r.client.Create(context.Background(), svcDec); err != nil {
if !errors.IsAlreadyExists(err) {
return reconcile.Result{}, fmt.Errorf(
"cannot create service decision %s (name not yet generated) in namespace %s: %v",
genName, svcDecNamespace, err)
}
}
continue
}
svcDec := &l.Items[0]
delSvc.Spec.ClusterIP = svcDec.Spec.Template.Spec.ClusterIP
if deep.Equal(svcDec.Spec.Template.ObjectMeta, delSvc.ObjectMeta) == nil ||
deep.Equal(svcDec.Spec.Template.Spec, delSvc.Spec) == nil {
// no need to update
continue
}
svcDec.Spec.Template.ObjectMeta = delSvc.ObjectMeta
svcDec.Spec.Template.Spec = delSvc.Spec
if err := r.client.Update(context.Background(), svcDec); err != nil && !patterns.IsOptimisticLockError(err) {
return reconcile.Result{}, fmt.Errorf("cannot update delegate service decision %s in namespace %s: %v",
svcDec.Name, svcDec.Namespace, err)
}
}
return reconcile.Result{}, nil
}
func makeDelegateService(svc *corev1.Service) *corev1.Service {
delSvc := &corev1.Service{}
delSvc.Name = svc.Name
delSvc.Namespace = svc.Namespace
labels := make(map[string]string)
for k, v := range svc.Labels {
labels[k] = v
}
labels[common.LabelKeyIsDelegate] = "true"
delSvc.Labels = labels
annotations := make(map[string]string)
for k, v := range svc.Annotations { // including "io.cilium/global-service"
annotations[k] = v
}
delSvc.Annotations = annotations
delSvc.Spec = *svc.Spec.DeepCopy()
delSvc.Spec.ClusterIP = "" // cluster IP given by each cluster (not really a top-level spec)
return delSvc
}