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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;
});
}, 5000);
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