feat: Create initializer to instantiate dynamic pods

src/init/ConfigPodInitializer.ts

@@ -0,0 +1,47 @@
+import type { ResourceIdentifier } from '../ldp/representation/ResourceIdentifier';
+import { getLoggerFor } from '../logging/LogUtil';
+import type { ComponentsJsFactory } from '../pods/generate/ComponentsJsFactory';
+import { TEMPLATE, TEMPLATE_VARIABLE } from '../pods/generate/variables/Variables';
+import type { KeyValueStorage } from '../storage/keyvalue/KeyValueStorage';
+import type { ResourceStore } from '../storage/ResourceStore';
+import { Initializer } from './Initializer';
+
+/**
+ * Initializes all pods that have been stored and loads them in memory.
+ * This reads the pod settings from a permanent storage and uses those
+ * to create the corresponding ResourceStores in memory,
+ * so this is required every time the server starts.
+ *
+ * Part of the dynamic pod creation.
+ * Reads the contents from the configuration storage, uses those values to instantiate ResourceStores,
+ * and then adds them to the routing storage.
+ * @see {@link ConfigPodManager}, {@link TemplatedPodGenerator}, {@link BaseUrlRouterRule}
+ */
+export class ConfigPodInitializer extends Initializer {
+  protected readonly logger = getLoggerFor(this);
+  private readonly storeFactory: ComponentsJsFactory;
+  private readonly configStorage: KeyValueStorage<string, unknown>;
+  private readonly routingStorage: KeyValueStorage<ResourceIdentifier, ResourceStore>;
+
+  public constructor(storeFactory: ComponentsJsFactory,
+    configStorage: KeyValueStorage<string, unknown>,
+    routingStorage: KeyValueStorage<ResourceIdentifier, ResourceStore>) {
+    super();
+    this.storeFactory = storeFactory;
+    this.configStorage = configStorage;
+    this.routingStorage = routingStorage;
+  }
+
+  public async handle(): Promise<void> {
+    let count = 0;
+    for await (const [ path, value ] of this.configStorage.entries()) {
+      const config = value as NodeJS.Dict<string>;
+      const store: ResourceStore =
+        await this.storeFactory.generate(config[TEMPLATE_VARIABLE.templateConfig]!, TEMPLATE.ResourceStore, config);
+      await this.routingStorage.set({ path }, store);
+      this.logger.debug(`Initialized pod at ${path}`);
+      count += 1;
+    }
+    this.logger.info(`Initialized ${count} dynamic pods.`);
+  }
+}