diff --git a/examples/fleet-namespace/cache.go b/examples/fleet-namespace/cache.go new file mode 100644 index 0000000000..be0e685175 --- /dev/null +++ b/examples/fleet-namespace/cache.go @@ -0,0 +1,188 @@ +package main + +import ( + "context" + "errors" + "fmt" + "time" + + apierrors "k8s.io/apimachinery/pkg/api/errors" + "k8s.io/apimachinery/pkg/api/meta" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/runtime/schema" + toolscache "k8s.io/client-go/tools/cache" + "sigs.k8s.io/controller-runtime/pkg/cache" + "sigs.k8s.io/controller-runtime/pkg/client" +) + +const ( + ClusterNameIndex = "cluster/name" + ClusterIndex = "cluster" +) + +var _ cache.Cache = &NamespacedCache{} + +type NamespacedCache struct { + clusterName string + cache.Cache +} + +func (c *NamespacedCache) Get(ctx context.Context, key client.ObjectKey, obj client.Object, opts ...client.GetOption) error { + if key.Namespace != "default" { + return apierrors.NewNotFound(schema.GroupResource{}, key.Name) + } + key.Namespace = c.clusterName + if err := c.Cache.Get(ctx, key, obj, opts...); err != nil { + return err + } + obj.SetNamespace("default") + return nil +} + +func (c *NamespacedCache) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error { + var listOpts client.ListOptions + for _, o := range opts { + o.ApplyToList(&listOpts) + } + + switch { + case listOpts.FieldSelector != nil: + reqs := listOpts.FieldSelector.Requirements() + flds := make(map[string]string, len(reqs)) + for i := range reqs { + flds[fmt.Sprintf("cluster/%s", reqs[i].Field)] = fmt.Sprintf("%s/%s", c.clusterName, reqs[i].Value) + } + opts = append(opts, client.MatchingFields(flds)) + case listOpts.Namespace != "": + opts = append(opts, client.MatchingFields(map[string]string{ClusterIndex: c.clusterName})) + if c.clusterName == "*" { + listOpts.Namespace = "" + } else if listOpts.Namespace == "default" { + listOpts.Namespace = c.clusterName + } + default: + opts = append(opts, client.MatchingFields(map[string]string{ClusterIndex: c.clusterName})) + } + + if err := c.Cache.List(ctx, list, opts...); err != nil { + return err + } + + return meta.EachListItem(list, func(obj runtime.Object) error { + obj.(client.Object).SetNamespace("default") + return nil + }) +} + +func (c *NamespacedCache) GetInformer(ctx context.Context, obj client.Object, opts ...cache.InformerGetOption) (cache.Informer, error) { + inf, err := c.Cache.GetInformer(ctx, obj, opts...) + if err != nil { + return nil, err + } + return &ScopedInformer{clusterName: c.clusterName, Informer: inf}, nil +} + +func (c *NamespacedCache) GetInformerForKind(ctx context.Context, gvk schema.GroupVersionKind, opts ...cache.InformerGetOption) (cache.Informer, error) { + inf, err := c.Cache.GetInformerForKind(ctx, gvk, opts...) + if err != nil { + return nil, err + } + return &ScopedInformer{clusterName: c.clusterName, Informer: inf}, nil +} + +func (c *NamespacedCache) RemoveInformer(ctx context.Context, obj client.Object) error { + return errors.New("informer cannot be removed from scoped cache") +} + +type ScopedInformer struct { + clusterName string + cache.Informer +} + +func (i *ScopedInformer) AddEventHandler(handler toolscache.ResourceEventHandler) (toolscache.ResourceEventHandlerRegistration, error) { + return i.Informer.AddEventHandler(toolscache.ResourceEventHandlerDetailedFuncs{ + AddFunc: func(obj interface{}, isInInitialList bool) { + cobj := obj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnAdd(cobj, isInInitialList) + } + }, + UpdateFunc: func(oldObj, newObj interface{}) { + cobj := newObj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnUpdate(oldObj, cobj) + } + }, + DeleteFunc: func(obj interface{}) { + if tombStone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok { + obj = tombStone.Obj + } + cobj := obj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnDelete(cobj) + } + }, + }) +} + +func (i *ScopedInformer) AddEventHandlerWithResyncPeriod(handler toolscache.ResourceEventHandler, resyncPeriod time.Duration) (toolscache.ResourceEventHandlerRegistration, error) { + return i.Informer.AddEventHandlerWithResyncPeriod(toolscache.ResourceEventHandlerDetailedFuncs{ + AddFunc: func(obj interface{}, isInInitialList bool) { + cobj := obj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnAdd(cobj, isInInitialList) + } + }, + UpdateFunc: func(oldObj, newObj interface{}) { + cobj := newObj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnUpdate(oldObj, cobj) + } + }, + DeleteFunc: func(obj interface{}) { + if tombStone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok { + obj = tombStone.Obj + } + cobj := obj.(client.Object) + if cobj.GetNamespace() == i.clusterName { + cobj := cobj.DeepCopyObject().(client.Object) + cobj.SetNamespace("default") + handler.OnDelete(cobj) + } + }, + }, resyncPeriod) +} + +func (i *ScopedInformer) AddIndexers(indexers toolscache.Indexers) error { + return errors.New("indexes cannot be added to scoped informers") +} + +type NamespaceScopeableCache struct { + cache.Cache +} + +func (f *NamespaceScopeableCache) IndexField(ctx context.Context, obj client.Object, field string, extractValue client.IndexerFunc) error { + return f.IndexField(ctx, obj, "cluster/"+field, func(obj client.Object) []string { + keys := extractValue(obj) + withCluster := make([]string, len(keys)*2) + for i, key := range keys { + withCluster[i] = fmt.Sprintf("%s/%s", obj.GetNamespace(), key) + withCluster[i+len(keys)] = fmt.Sprintf("*/%s", key) + } + return withCluster + }) +} + +func (f *NamespaceScopeableCache) Start(ctx context.Context) error { + return nil // no-op as this is shared +} diff --git a/examples/fleet-namespace/client.go b/examples/fleet-namespace/client.go new file mode 100644 index 0000000000..0ed81b706d --- /dev/null +++ b/examples/fleet-namespace/client.go @@ -0,0 +1,75 @@ +package main + +import ( + "context" + + apierrors "k8s.io/apimachinery/pkg/api/errors" + "k8s.io/apimachinery/pkg/api/meta" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/runtime/schema" + "sigs.k8s.io/controller-runtime/pkg/client" +) + +var _ client.Client = &NamespacedClient{} + +type NamespacedClient struct { + clusterName string + client.Client +} + +func (n *NamespacedClient) Get(ctx context.Context, key client.ObjectKey, obj client.Object, opts ...client.GetOption) error { + if key.Namespace != "default" { + return apierrors.NewNotFound(schema.GroupResource{}, key.Name) + } + key.Namespace = n.clusterName + if err := n.Client.Get(ctx, key, obj, opts...); err != nil { + return err + } + obj.SetNamespace("default") + return nil +} + +func (n *NamespacedClient) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error { + var copts client.ListOptions + for _, o := range opts { + o.ApplyToList(&copts) + } + if copts.Namespace != "default" { + return apierrors.NewNotFound(schema.GroupResource{}, copts.Namespace) + } + if err := n.Client.List(ctx, list, append(opts, client.InNamespace(n.clusterName))...); err != nil { + return err + } + return meta.EachListItem(list, func(obj runtime.Object) error { + obj.(client.Object).SetNamespace("default") + return nil + }) +} + +func (n *NamespacedClient) Create(ctx context.Context, obj client.Object, opts ...client.CreateOption) error { + panic("implement me") +} + +func (n *NamespacedClient) Delete(ctx context.Context, obj client.Object, opts ...client.DeleteOption) error { + panic("implement me") +} + +func (n *NamespacedClient) Update(ctx context.Context, obj client.Object, opts ...client.UpdateOption) error { + panic("implement me") +} + +func (n *NamespacedClient) Patch(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.PatchOption) error { + panic("implement me") +} + +func (n *NamespacedClient) DeleteAllOf(ctx context.Context, obj client.Object, opts ...client.DeleteAllOfOption) error { + panic("implement me") +} + +func (n *NamespacedClient) Status() client.SubResourceWriter { + panic("implement me") +} + +func (n *NamespacedClient) SubResource(subResource string) client.SubResourceClient { + panic("implement me") +} diff --git a/examples/fleet-namespace/cluster.go b/examples/fleet-namespace/cluster.go new file mode 100644 index 0000000000..f6ec62f47a --- /dev/null +++ b/examples/fleet-namespace/cluster.go @@ -0,0 +1,39 @@ +package main + +import ( + "context" + + "k8s.io/client-go/tools/record" + "sigs.k8s.io/controller-runtime/pkg/cache" + "sigs.k8s.io/controller-runtime/pkg/client" + "sigs.k8s.io/controller-runtime/pkg/cluster" +) + +type NamespacedCluster struct { + clusterName string + cluster.Cluster +} + +func (c *NamespacedCluster) Name() string { + return c.clusterName +} + +func (c *NamespacedCluster) GetCache() cache.Cache { + return &NamespacedCache{clusterName: c.clusterName, Cache: c.Cluster.GetCache()} +} + +func (c *NamespacedCluster) GetClient() client.Client { + return &NamespacedClient{clusterName: c.clusterName, Client: c.Cluster.GetClient()} +} + +func (c *NamespacedCluster) GetEventRecorderFor(name string) record.EventRecorder { + panic("implement me") +} + +func (c *NamespacedCluster) GetAPIReader() client.Reader { + return c.GetClient() +} + +func (c *NamespacedCluster) Start(ctx context.Context) error { + return nil // no-op as this is shared +} diff --git a/examples/fleet-namespace/go.mod b/examples/fleet-namespace/go.mod new file mode 100644 index 0000000000..edeec1f4c3 --- /dev/null +++ b/examples/fleet-namespace/go.mod @@ -0,0 +1,68 @@ +module sigs.k8s.io/controller-runtime/examples/fleet + +go 1.19 + +replace sigs.k8s.io/controller-runtime => ../.. + +require ( + golang.org/x/sync v0.6.0 + k8s.io/api v0.28.3 + k8s.io/apimachinery v0.28.3 + k8s.io/client-go v0.28.3 + k8s.io/klog/v2 v2.110.1 + sigs.k8s.io/controller-runtime v0.0.0-00010101000000-000000000000 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/evanphx/json-patch/v5 v5.7.0 // indirect + github.com/fsnotify/fsnotify v1.7.0 // indirect + github.com/go-logr/logr v1.3.0 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.6.0 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.17.0 // indirect + github.com/prometheus/client_model v0.5.0 // indirect + github.com/prometheus/common v0.44.0 // indirect + github.com/prometheus/procfs v0.11.1 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e // indirect + golang.org/x/net v0.17.0 // indirect + golang.org/x/oauth2 v0.8.0 // indirect + golang.org/x/sys v0.14.0 // indirect + golang.org/x/term v0.13.0 // indirect + golang.org/x/text v0.13.0 // indirect + golang.org/x/time v0.3.0 // indirect + gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.31.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/apiextensions-apiserver v0.28.3 // indirect + k8s.io/component-base v0.28.3 // indirect + k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect + k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/examples/fleet-namespace/go.sum b/examples/fleet-namespace/go.sum new file mode 100644 index 0000000000..b525387bf4 --- /dev/null +++ b/examples/fleet-namespace/go.sum @@ -0,0 +1,187 @@ +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= +github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44= +github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g= +github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/evanphx/json-patch v5.7.0+incompatible h1:vgGkfT/9f8zE6tvSCe74nfpAVDQ2tG6yudJd8LBksgI= +github.com/evanphx/json-patch/v5 v5.7.0 h1:nJqP7uwL84RJInrohHfW0Fx3awjbm8qZeFv0nW9SYGc= +github.com/evanphx/json-patch/v5 v5.7.0/go.mod h1:VNkHZ/282BpEyt/tObQO8s5CMPmYYq14uClGH4abBuQ= +github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA= +github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM= +github.com/go-logr/logr v1.3.0 h1:2y3SDp0ZXuc6/cjLSZ+Q3ir+QB9T/iG5yYRXqsagWSY= +github.com/go-logr/logr v1.3.0/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-logr/zapr v1.3.0 h1:XGdV8XW8zdwFiwOA2Dryh1gj2KRQyOOoNmBy4EplIcQ= +github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE= +github.com/go-openapi/jsonpointer v0.19.6/go.mod 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h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0= +sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo= +sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0= +sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE= +sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/examples/fleet-namespace/main.go b/examples/fleet-namespace/main.go new file mode 100644 index 0000000000..35b126365f --- /dev/null +++ b/examples/fleet-namespace/main.go @@ -0,0 +1,236 @@ +package main + +import ( + "context" + "errors" + "fmt" + "os" + "sync" + + "golang.org/x/sync/errgroup" + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/util/runtime" + "k8s.io/apimachinery/pkg/watch" + "k8s.io/client-go/rest" + toolscache "k8s.io/client-go/tools/cache" + "k8s.io/klog/v2" + ctrl "sigs.k8s.io/controller-runtime" + "sigs.k8s.io/controller-runtime/pkg/builder" + cache "sigs.k8s.io/controller-runtime/pkg/cache" + "sigs.k8s.io/controller-runtime/pkg/client" + "sigs.k8s.io/controller-runtime/pkg/cluster" + "sigs.k8s.io/controller-runtime/pkg/envtest" + "sigs.k8s.io/controller-runtime/pkg/log" + "sigs.k8s.io/controller-runtime/pkg/manager" + "sigs.k8s.io/controller-runtime/pkg/manager/signals" + "sigs.k8s.io/controller-runtime/pkg/reconcile" +) + +func init() { + ctrl.SetLogger(klog.Background()) +} + +func main() { + entryLog := log.Log.WithName("entrypoint") + ctx := signals.SetupSignalHandler() + + testEnv := &envtest.Environment{} + cfg, err := testEnv.Start() + if err != nil { + entryLog.Error(err, "failed to start local environment") + os.Exit(1) + } + defer func() { + if testEnv == nil { + return + } + if err := testEnv.Stop(); err != nil { + entryLog.Error(err, "failed to stop local environment") + os.Exit(1) + } + }() + + // Test fixtures + cli, err := client.New(cfg, client.Options{}) + if err != nil { + entryLog.Error(err, "failed to create client") + os.Exit(1) + } + runtime.Must(cli.Create(ctx, &corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: "zoo"}})) + runtime.Must(cli.Create(ctx, &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: "zoo", Name: "elephant"}})) + runtime.Must(cli.Create(ctx, &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: "zoo", Name: "lion"}})) + runtime.Must(cli.Create(ctx, &corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: "jungle"}})) + runtime.Must(cli.Create(ctx, &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: "jungle", Name: "monkey"}})) + runtime.Must(cli.Create(ctx, &corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: "island"}})) + runtime.Must(cli.Create(ctx, &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Namespace: "island", Name: "bird"}})) + + entryLog.Info("Setting up provider") + cl, err := cluster.New(cfg, func(options *cluster.Options) { + options.Cache.AdditionalDefaultIndexes = map[string]client.IndexerFunc{ + ClusterNameIndex: func(obj client.Object) []string { + return []string{ + fmt.Sprintf("%s/%s", obj.GetNamespace(), obj.GetName()), + fmt.Sprintf("%s/%s", "*", obj.GetName()), + } + }, + ClusterIndex: func(obj client.Object) []string { + return []string{obj.GetNamespace()} + }, + } + }) + if err != nil { + entryLog.Error(err, "unable to set up provider") + os.Exit(1) + } + provider := &NamespacedClusterProvider{Cluster: cl} + + // Setup a cluster-aware Manager, watching the clusters (= namespaces) through + // the cluster provider. + entryLog.Info("Setting up cluster-aware manager") + mgr, err := manager.New(cfg, manager.Options{ + NewCache: func(config *rest.Config, opts cache.Options) (cache.Cache, error) { + // wrap cache to turn IndexField calls into cluster-scoped indexes. + return &NamespaceScopeableCache{Cache: cl.GetCache()}, nil + }, + }.WithExperimentalClusterProvider(provider)) + if err != nil { + entryLog.Error(err, "unable to set up overall controller manager") + os.Exit(1) + } + + if err := builder.ControllerManagedBy(mgr). + For(&corev1.ConfigMap{}).Complete(reconcile.Func( + func(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { + log := log.FromContext(ctx) + + cl, err := mgr.GetCluster(ctx, req.ClusterName) + if err != nil { + return reconcile.Result{}, err + } + cli := cl.GetClient() + + // Retrieve the service account from the namespace. + cm := &corev1.ConfigMap{} + if err := cli.Get(ctx, req.NamespacedName, cm); err != nil { + return reconcile.Result{}, err + } + log.Info("Reconciling configmap", "cluster", req.ClusterName, "ns", req.Namespace, "name", cm.Name, "uuid", cm.UID) + + return ctrl.Result{}, nil + }, + )); err != nil { + entryLog.Error(err, "unable to set up controller") + os.Exit(1) + } + + entryLog.Info("Starting provider") + g, ctx := errgroup.WithContext(ctx) + g.Go(func() error { + if err := ignoreCanceled(provider.Start(ctx)); err != nil { + return fmt.Errorf("failed to start provider: %w", err) + } + return nil + }) + + entryLog.Info("Starting cluster-aware manager") + g.Go(func() error { + if err := ignoreCanceled(mgr.Start(ctx)); err != nil { + return fmt.Errorf("unable to run cluster-aware manager: %w", err) + } + return nil + }) + + if err := g.Wait(); err != nil { + entryLog.Error(err, "failed to run managers") + os.Exit(1) + } +} + +// NamespacedClusterProvider is a cluster provider that represents each namespace +// as a dedicated cluster with only a "default" namespace. It maps each namespace +// to "default" and vice versa, simulating a multi-cluster setup. It uses one +// informer to watch objects for all namespaces. +type NamespacedClusterProvider struct { + cluster.Cluster +} + +func (p *NamespacedClusterProvider) Get(ctx context.Context, clusterName string, opts ...cluster.Option) (cluster.Cluster, error) { + ns := &corev1.Namespace{} + if err := p.Cluster.GetCache().Get(ctx, client.ObjectKey{Name: clusterName}, ns); err != nil { + return nil, err + } + + return &NamespacedCluster{clusterName: clusterName, Cluster: p.Cluster}, nil +} + +func (p *NamespacedClusterProvider) List(ctx context.Context) ([]string, error) { + nss := &corev1.NamespaceList{} + if err := p.Cluster.GetCache().List(ctx, nss); err != nil { + return nil, err + } + + res := make([]string, 0, len(nss.Items)) + for _, ns := range nss.Items { + res = append(res, ns.Name) + } + return res, nil +} + +func (p *NamespacedClusterProvider) Watch(ctx context.Context) (cluster.Watcher, error) { + inf, err := p.Cluster.GetCache().GetInformer(ctx, &corev1.Namespace{}) + if err != nil { + return nil, err + } + return &NamespaceWatcher{inf: inf, ch: make(chan cluster.WatchEvent)}, nil +} + +type NamespaceWatcher struct { + inf cache.Informer + init sync.Once + ch chan cluster.WatchEvent + reg toolscache.ResourceEventHandlerRegistration +} + +func (w *NamespaceWatcher) Stop() { + if w.reg != nil { + _ = w.inf.RemoveEventHandler(w.reg) + } + close(w.ch) +} + +func (w *NamespaceWatcher) ResultChan() <-chan cluster.WatchEvent { + w.init.Do(func() { + w.reg, _ = w.inf.AddEventHandler(toolscache.ResourceEventHandlerFuncs{ + AddFunc: func(obj interface{}) { + ns := obj.(*corev1.Namespace) + w.ch <- cluster.WatchEvent{ + Type: watch.Added, + ClusterName: ns.Name, + } + }, + DeleteFunc: func(obj interface{}) { + ns := obj.(*corev1.Namespace) + w.ch <- cluster.WatchEvent{ + Type: watch.Deleted, + ClusterName: ns.Name, + } + }, + UpdateFunc: func(oldObj, newObj interface{}) { + ns := newObj.(*corev1.Namespace) + w.ch <- cluster.WatchEvent{ + Type: watch.Modified, + ClusterName: ns.Name, + } + }, + }) + }) + return w.ch +} + +func ignoreCanceled(err error) error { + if errors.Is(err, context.Canceled) { + return nil + } + return err +}