metadata engine

server/internal/objects/transactional.ts

@@ -0,0 +1,38 @@
+/*
+The purpose of this class is to hold references to remote objects (like images) until they're actually needed
+This is used as a utility in metadata handling, so we only fetch the objects if we're actually creating a database record.
+*/
+import { v4 as uuidv4 } from 'uuid';
+
+type TransactionTable = { [key: string]: string }; // ID to URL
+type GlobalTransactionRecord = { [key: string]: TransactionTable }; // Transaction ID to table
+
+type Register = (url: string) => string;
+type Pull = () => Promise<void>;
+type Dump = () => void;
+
+export class ObjectTransactionalHandler {
+    private record: GlobalTransactionRecord = {};
+
+    new(): [Register, Pull, Dump] {
+        const transactionId = uuidv4();
+
+        const register = (url: string) => {
+            const objectId = uuidv4();
+            this.record[transactionId][objectId] = url;
+
+            return objectId;
+        }
+
+        const pull = async () => {
+            // Dummy function
+            dump();
+        }
+
+        const dump = () => {
+            delete this.record[transactionId];
+        }
+
+        return [register, pull, dump];
+    }
+}