Cache meta

src/misc/fetch-meta.ts

@@ -1,7 +1,11 @@
 import { Meta } from '../models/entities/meta';
 import { getConnection } from 'typeorm';
 
-export default async function(): Promise<Meta> {
+let cache: Meta;
+
+export async function fetchMeta(noCache = false): Promise<Meta> {
+	if (!noCache && cache) return cache;
+
 	return await getConnection().transaction(async transactionalEntityManager => {
 		// 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, {
@@ -11,11 +15,21 @@ export default async function(): Promise<Meta> {
 		});
 
 		if (meta) {
+			cache = meta;
 			return meta;
 		} else {
-			return await transactionalEntityManager.save(Meta, {
+			const saved = await transactionalEntityManager.save(Meta, {
 				id: 'x'
 			}) as Meta;
+
+			cache = saved;
+			return saved;
 		}
 	});
 }
+
+setInterval(() => {
+	fetchMeta(true).then(meta => {
+		cache = meta;
+	});
+}, 5000);