refactoring

Resolve #7779

packages/backend/src/misc/fetch-meta.ts

@@ -0,0 +1,35 @@
+import { Meta } from '@/models/entities/meta';
+import { getConnection } from 'typeorm';
+
+let cache: Meta;
+
+export async function fetchMeta(noCache = false): Promise<Meta> {
+	if (!noCache && cache) return cache;
+
+	return await getConnection().transaction(async transactionalEntityManager => {
+		// 過去のバグでレコードが複数出来てしまっている可能性があるので新しいIDを優先する
+		const meta = await transactionalEntityManager.findOne(Meta, {
+			order: {
+				id: 'DESC'
+			}
+		});
+
+		if (meta) {
+			cache = meta;
+			return meta;
+		} else {
+			const saved = await transactionalEntityManager.save(Meta, {
+				id: 'x'
+			}) as Meta;
+
+			cache = saved;
+			return saved;
+		}
+	});
+}
+
+setInterval(() => {
+	fetchMeta(true).then(meta => {
+		cache = meta;
+	});
+}, 1000 * 10);