|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "errors" |
| 6 | + "fmt" |
| 7 | + "time" |
| 8 | + |
| 9 | + apierrors "k8s.io/apimachinery/pkg/api/errors" |
| 10 | + "k8s.io/apimachinery/pkg/api/meta" |
| 11 | + "k8s.io/apimachinery/pkg/runtime" |
| 12 | + "k8s.io/apimachinery/pkg/runtime/schema" |
| 13 | + toolscache "k8s.io/client-go/tools/cache" |
| 14 | + "sigs.k8s.io/controller-runtime/pkg/cache" |
| 15 | + "sigs.k8s.io/controller-runtime/pkg/client" |
| 16 | +) |
| 17 | + |
| 18 | +const ( |
| 19 | + ClusterNameIndex = "cluster/name" |
| 20 | + ClusterIndex = "cluster" |
| 21 | +) |
| 22 | + |
| 23 | +var _ cache.Cache = &NamespacedCache{} |
| 24 | + |
| 25 | +type NamespacedCache struct { |
| 26 | + clusterName string |
| 27 | + cache.Cache |
| 28 | +} |
| 29 | + |
| 30 | +func (c *NamespacedCache) Get(ctx context.Context, key client.ObjectKey, obj client.Object, opts ...client.GetOption) error { |
| 31 | + if key.Namespace != "default" { |
| 32 | + return apierrors.NewNotFound(schema.GroupResource{}, key.Name) |
| 33 | + } |
| 34 | + key.Namespace = c.clusterName |
| 35 | + if err := c.Cache.Get(ctx, key, obj, opts...); err != nil { |
| 36 | + return err |
| 37 | + } |
| 38 | + obj.SetNamespace("default") |
| 39 | + return nil |
| 40 | +} |
| 41 | + |
| 42 | +func (c *NamespacedCache) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error { |
| 43 | + var listOpts client.ListOptions |
| 44 | + for _, o := range opts { |
| 45 | + o.ApplyToList(&listOpts) |
| 46 | + } |
| 47 | + |
| 48 | + switch { |
| 49 | + case listOpts.FieldSelector != nil: |
| 50 | + reqs := listOpts.FieldSelector.Requirements() |
| 51 | + flds := make(map[string]string, len(reqs)) |
| 52 | + for i := range reqs { |
| 53 | + flds[fmt.Sprintf("cluster/%s", reqs[i].Field)] = fmt.Sprintf("%s/%s", c.clusterName, reqs[i].Value) |
| 54 | + } |
| 55 | + opts = append(opts, client.MatchingFields(flds)) |
| 56 | + case listOpts.Namespace != "": |
| 57 | + opts = append(opts, client.MatchingFields(map[string]string{ClusterIndex: c.clusterName})) |
| 58 | + if c.clusterName == "*" { |
| 59 | + listOpts.Namespace = "" |
| 60 | + } else if listOpts.Namespace == "default" { |
| 61 | + listOpts.Namespace = c.clusterName |
| 62 | + } |
| 63 | + default: |
| 64 | + opts = append(opts, client.MatchingFields(map[string]string{ClusterIndex: c.clusterName})) |
| 65 | + } |
| 66 | + |
| 67 | + if err := c.Cache.List(ctx, list, opts...); err != nil { |
| 68 | + return err |
| 69 | + } |
| 70 | + |
| 71 | + return meta.EachListItem(list, func(obj runtime.Object) error { |
| 72 | + obj.(client.Object).SetNamespace("default") |
| 73 | + return nil |
| 74 | + }) |
| 75 | +} |
| 76 | + |
| 77 | +func (c *NamespacedCache) GetInformer(ctx context.Context, obj client.Object, opts ...cache.InformerGetOption) (cache.Informer, error) { |
| 78 | + inf, err := c.Cache.GetInformer(ctx, obj, opts...) |
| 79 | + if err != nil { |
| 80 | + return nil, err |
| 81 | + } |
| 82 | + return &ScopedInformer{clusterName: c.clusterName, Informer: inf}, nil |
| 83 | +} |
| 84 | + |
| 85 | +func (c *NamespacedCache) GetInformerForKind(ctx context.Context, gvk schema.GroupVersionKind, opts ...cache.InformerGetOption) (cache.Informer, error) { |
| 86 | + inf, err := c.Cache.GetInformerForKind(ctx, gvk, opts...) |
| 87 | + if err != nil { |
| 88 | + return nil, err |
| 89 | + } |
| 90 | + return &ScopedInformer{clusterName: c.clusterName, Informer: inf}, nil |
| 91 | +} |
| 92 | + |
| 93 | +func (c *NamespacedCache) RemoveInformer(ctx context.Context, obj client.Object) error { |
| 94 | + return errors.New("informer cannot be removed from scoped cache") |
| 95 | +} |
| 96 | + |
| 97 | +type ScopedInformer struct { |
| 98 | + clusterName string |
| 99 | + cache.Informer |
| 100 | +} |
| 101 | + |
| 102 | +func (i *ScopedInformer) AddEventHandler(handler toolscache.ResourceEventHandler) (toolscache.ResourceEventHandlerRegistration, error) { |
| 103 | + return i.Informer.AddEventHandler(toolscache.ResourceEventHandlerDetailedFuncs{ |
| 104 | + AddFunc: func(obj interface{}, isInInitialList bool) { |
| 105 | + cobj := obj.(client.Object) |
| 106 | + if cobj.GetNamespace() == i.clusterName { |
| 107 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 108 | + cobj.SetNamespace("default") |
| 109 | + handler.OnAdd(cobj, isInInitialList) |
| 110 | + } |
| 111 | + }, |
| 112 | + UpdateFunc: func(oldObj, newObj interface{}) { |
| 113 | + cobj := newObj.(client.Object) |
| 114 | + if cobj.GetNamespace() == i.clusterName { |
| 115 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 116 | + cobj.SetNamespace("default") |
| 117 | + handler.OnUpdate(oldObj, cobj) |
| 118 | + } |
| 119 | + }, |
| 120 | + DeleteFunc: func(obj interface{}) { |
| 121 | + if tombStone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok { |
| 122 | + obj = tombStone.Obj |
| 123 | + } |
| 124 | + cobj := obj.(client.Object) |
| 125 | + if cobj.GetNamespace() == i.clusterName { |
| 126 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 127 | + cobj.SetNamespace("default") |
| 128 | + handler.OnDelete(cobj) |
| 129 | + } |
| 130 | + }, |
| 131 | + }) |
| 132 | +} |
| 133 | + |
| 134 | +func (i *ScopedInformer) AddEventHandlerWithResyncPeriod(handler toolscache.ResourceEventHandler, resyncPeriod time.Duration) (toolscache.ResourceEventHandlerRegistration, error) { |
| 135 | + return i.Informer.AddEventHandlerWithResyncPeriod(toolscache.ResourceEventHandlerDetailedFuncs{ |
| 136 | + AddFunc: func(obj interface{}, isInInitialList bool) { |
| 137 | + cobj := obj.(client.Object) |
| 138 | + if cobj.GetNamespace() == i.clusterName { |
| 139 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 140 | + cobj.SetNamespace("default") |
| 141 | + handler.OnAdd(cobj, isInInitialList) |
| 142 | + } |
| 143 | + }, |
| 144 | + UpdateFunc: func(oldObj, newObj interface{}) { |
| 145 | + cobj := newObj.(client.Object) |
| 146 | + if cobj.GetNamespace() == i.clusterName { |
| 147 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 148 | + cobj.SetNamespace("default") |
| 149 | + handler.OnUpdate(oldObj, cobj) |
| 150 | + } |
| 151 | + }, |
| 152 | + DeleteFunc: func(obj interface{}) { |
| 153 | + if tombStone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok { |
| 154 | + obj = tombStone.Obj |
| 155 | + } |
| 156 | + cobj := obj.(client.Object) |
| 157 | + if cobj.GetNamespace() == i.clusterName { |
| 158 | + cobj := cobj.DeepCopyObject().(client.Object) |
| 159 | + cobj.SetNamespace("default") |
| 160 | + handler.OnDelete(cobj) |
| 161 | + } |
| 162 | + }, |
| 163 | + }, resyncPeriod) |
| 164 | +} |
| 165 | + |
| 166 | +func (i *ScopedInformer) AddIndexers(indexers toolscache.Indexers) error { |
| 167 | + return errors.New("indexes cannot be added to scoped informers") |
| 168 | +} |
| 169 | + |
| 170 | +type NamespaceScopeableCache struct { |
| 171 | + cache.Cache |
| 172 | +} |
| 173 | + |
| 174 | +func (f *NamespaceScopeableCache) IndexField(ctx context.Context, obj client.Object, field string, extractValue client.IndexerFunc) error { |
| 175 | + return f.IndexField(ctx, obj, "cluster/"+field, func(obj client.Object) []string { |
| 176 | + keys := extractValue(obj) |
| 177 | + withCluster := make([]string, len(keys)*2) |
| 178 | + for i, key := range keys { |
| 179 | + withCluster[i] = fmt.Sprintf("%s/%s", obj.GetNamespace(), key) |
| 180 | + withCluster[i+len(keys)] = fmt.Sprintf("*/%s", key) |
| 181 | + } |
| 182 | + return withCluster |
| 183 | + }) |
| 184 | +} |
| 185 | + |
| 186 | +func (f *NamespaceScopeableCache) Start(ctx context.Context) error { |
| 187 | + return nil // no-op as this is shared |
| 188 | +} |
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