Potential entry point

web/packages/new/photos/services/embedding.ts

@@ -87,7 +87,7 @@ type RemoteEmbedding = z.infer<typeof RemoteEmbedding>;
  * This function should be called only after we have synced files with remote.
  * See: [Note: Ignoring embeddings for unknown files].
  */
-export const pullEmbeddings = async (
+const pullEmbeddings = async (
     model: EmbeddingModel,
     save: (decryptedEmbedding: string) => Promise<void>,
 ) => {

web/packages/new/photos/services/face/worker.ts

@@ -0,0 +1,22 @@
+import { pullFaceEmbeddings } from "../embedding";
+
+/**
+ * Run operations related to face indexing and search in a Web Worker.
+ *
+ * This is a normal class that is however exposed (via comlink) as a proxy
+ * running inside a Web Worker. This way, we do not bother the main thread with
+ * tasks that might degrade interactivity.
+ */
+export class FaceWorker {
+    private isSyncing = false;
+
+    /**
+     * Pull embeddings from remote, and start backfilling if needed.
+     */
+    async sync() {
+        if (this.isSyncing) return;
+        this.isSyncing = true;
+        await pullFaceEmbeddings();
+        this.isSyncing = false;
+    }
+}