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

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import { db } from "@/db/postgre.js";
import { Meta } from "@/models/entities/meta.js";
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let cache: Meta;
export async function fetchMeta(noCache = false): Promise<Meta> {
if (!noCache && cache) return cache;
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return await db.transaction(async (transactionalEntityManager) => {
// New IDs are prioritized because multiple records may have been created due to past bugs.
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const metas = await transactionalEntityManager.find(Meta, {
order: {
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id: "DESC",
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},
});
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const meta = metas[0];
if (meta) {
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cache = meta;
return meta;
} else {
// If fetchMeta is called at the same time when meta is empty, this part may be called at the same time, so use fail-safe upsert.
const saved = await transactionalEntityManager
.upsert(
Meta,
{
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id: "x",
},
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["id"],
)
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.then((x) =>
transactionalEntityManager.findOneByOrFail(Meta, x.identifiers[0]),
);
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cache = saved;
return saved;
}
});
}
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setInterval(() => {
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fetchMeta(true).then((meta) => {
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cache = meta;
});
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}, 1000 * 10);