feat: add model registry to object serializer

src/serializer.ts

@@ -1,5 +1,13 @@
 import { ObjectSerializer as InternalSerializer, V1ObjectMeta } from './gen/models/ObjectSerializer.js';
 
+type KubernetesObjectHeader = {
+    apiVersion: string;
+    kind: string;
+};
+
+const isKubernetesObject = (data: unknown): data is KubernetesObjectHeader =>
+    !!data && typeof data === 'object' && 'apiVersion' in data && 'kind' in data;
+
 type AttributeType = {
     name: string;
     baseName: string;
@@ -38,30 +46,38 @@ class KubernetesObject {
             format: '',
         },
     ];
-}
-
-const isKubernetesObject = (data: unknown): boolean =>
-    !!data && typeof data === 'object' && 'apiVersion' in data && 'kind' in data;
 
-/**
- * Wraps the ObjectSerializer to support custom resources and generic Kubernetes objects.
- */
-export class ObjectSerializer extends InternalSerializer {
-    public static serialize(data: any, type: string, format: string = ''): any {
-        const obj = InternalSerializer.serialize(data, type, format);
-        if (obj !== data) {
-            return obj;
+    public serialize(): any {
+        const instance: Record<string, any> = {};
+        for (const attributeType of KubernetesObject.attributeTypeMap) {
+            const value = this[attributeType.baseName];
+            if (value !== undefined) {
+                instance[attributeType.name] = InternalSerializer.serialize(
+                    this[attributeType.baseName],
+                    attributeType.type,
+                    attributeType.format,
+                );
+            }
+        }
+        // add all unknown properties as is.
+        for (const [key, value] of Object.entries(this)) {
+            if (KubernetesObject.attributeTypeMap.find((t) => t.name === key)) {
+                continue;
+            }
+            instance[key] = value;
         }
+        return instance;
+    }
 
+    public static fromUnknown(data: unknown): KubernetesObject {
         if (!isKubernetesObject(data)) {
-            return obj;
+            throw new Error(`Unable to deseriliaze non-Kubernetes object ${data}.`);
         }
-
-        const instance: Record<string, any> = {};
+        const instance = new KubernetesObject();
         for (const attributeType of KubernetesObject.attributeTypeMap) {
             const value = data[attributeType.baseName];
             if (value !== undefined) {
-                instance[attributeType.name] = InternalSerializer.serialize(
+                instance[attributeType.name] = InternalSerializer.deserialize(
                     data[attributeType.baseName],
                     attributeType.type,
                     attributeType.format,
@@ -77,23 +93,114 @@ export class ObjectSerializer extends InternalSerializer {
         }
         return instance;
     }
+}
 
-    public static deserialize(data: any, type: string, format: string = ''): any {
-        const obj = InternalSerializer.deserialize(data, type, format);
+export interface Serializer {
+    serialize(data: any, type: string, format?: string): any;
+    deserialize(data: any, type: string, format?): any;
+}
+
+export type GroupVersionKind = {
+    group: string;
+    version: string;
+    kind: string;
+};
+
+type ModelRegistry = {
+    [gv: string]: {
+        [kind: string]: Serializer;
+    };
+};
+
+const gvString = ({ group, version }: GroupVersionKind): string => [group, version].join('/');
+
+const gvkFromObject = (obj: KubernetesObjectHeader): GroupVersionKind => {
+    const [g, v] = obj.apiVersion.split('/');
+    return {
+        kind: obj.kind,
+        group: v ? g : '',
+        version: v ? v : g,
+    };
+};
+
+/**
+ * Default serializer that uses the KubernetesObject to serialize and deserialize
+ * any object using only the minimum required attributes.
+ */
+export const defaultSerializer: Serializer = {
+    serialize: (data: any, type: string, format?: string): any => {
+        if (data instanceof KubernetesObject) {
+            return data.serialize();
+        }
+        return KubernetesObject.fromUnknown(data).serialize();
+    },
+    deserialize: (data: any, type: string, format?): any => {
+        return KubernetesObject.fromUnknown(data);
+    },
+};
+
+/**
+ * Wraps the ObjectSerializer to support custom resources and generic Kubernetes objects.
+ *
+ * CustomResources that are unknown to the ObjectSerializer can be registered
+ * by using ObjectSerializer.registerModel().
+ */
+export class ObjectSerializer extends InternalSerializer {
+    private static modelRegistry: ModelRegistry = {};
+
+    /**
+     * Adds a dedicated seriliazer for a Kubernetes resource.
+     * Every resource is uniquly identified using its group, version and kind.
+     * @param gvk
+     * @param serializer
+     */
+    public static registerModel(gvk: GroupVersionKind, serializer: Serializer) {
+        const gv = gvString(gvk);
+        const kinds = (this.modelRegistry[gv] ??= {});
+        if (kinds[gvk.kind]) {
+            throw new Error(`Kind ${gvk.kind} of ${gv} is already defined`);
+        }
+        kinds[gvk.kind] = serializer;
+    }
+
+    /**
+     * Removes all registered models from the registry.
+     */
+    public static clearModelRegistry(): void {
+        this.modelRegistry = {};
+    }
+
+    private static getSerializerForObject(obj: unknown): undefined | Serializer {
+        if (!isKubernetesObject(obj)) {
+            return undefined;
+        }
+        const gvk = gvkFromObject(obj);
+        return ObjectSerializer.modelRegistry[gvString(gvk)]?.[gvk.kind];
+    }
+
+    public static serialize(data: any, type: string, format: string = ''): any {
+        const serializer = ObjectSerializer.getSerializerForObject(data);
+        if (serializer) {
+            return serializer.serialize(data, type, format);
+        }
+        if (data instanceof KubernetesObject) {
+            return data.serialize();
+        }
+
+        const obj = InternalSerializer.serialize(data, type, format);
         if (obj !== data) {
-            // the serializer knows the type and already deserialized it.
             return obj;
         }
 
         if (!isKubernetesObject(data)) {
             return obj;
         }
 
-        const instance = new KubernetesObject();
+        const instance: Record<string, any> = {};
         for (const attributeType of KubernetesObject.attributeTypeMap) {
             const value = data[attributeType.baseName];
             if (value !== undefined) {
-                instance[attributeType.name] = InternalSerializer.deserialize(
+                instance[attributeType.name] = InternalSerializer.serialize(
                     data[attributeType.baseName],
                     attributeType.type,
                     attributeType.format,
@@ -109,4 +216,22 @@ export class ObjectSerializer extends InternalSerializer {
         }
         return instance;
     }
+
+    public static deserialize(data: any, type: string, format: string = ''): any {
+        const serializer = ObjectSerializer.getSerializerForObject(data);
+        if (serializer) {
+            return serializer.deserialize(data, type, format);
+        }
+        const obj = InternalSerializer.deserialize(data, type, format);
+        if (obj !== data) {
+            // the serializer knows the type and already deserialized it.
+            return obj;
+        }
+
+        if (!isKubernetesObject(data)) {
+            return obj;
+        }
+
+        return KubernetesObject.fromUnknown(data);
+    }
 }