23 lines
703 B
TypeScript
23 lines
703 B
TypeScript
import type { CronServiceState } from "./state.js";
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const storeLocks = new Map<string, Promise<void>>();
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const resolveChain = (promise: Promise<unknown>) =>
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promise.then(
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() => undefined,
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() => undefined,
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);
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export async function locked<T>(state: CronServiceState, fn: () => Promise<T>): Promise<T> {
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const storePath = state.deps.storePath;
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const storeOp = storeLocks.get(storePath) ?? Promise.resolve();
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const next = Promise.all([resolveChain(state.op), resolveChain(storeOp)]).then(fn);
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// Keep the chain alive even when the operation fails.
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const keepAlive = resolveChain(next);
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state.op = keepAlive;
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storeLocks.set(storePath, keepAlive);
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return (await next) as T;
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}
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