29 lines
740 B
TypeScript
29 lines
740 B
TypeScript
import { setTimeout as delay } from "node:timers/promises";
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export type BackoffPolicy = {
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initialMs: number;
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maxMs: number;
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factor: number;
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jitter: number;
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};
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export function computeBackoff(policy: BackoffPolicy, attempt: number) {
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const base = policy.initialMs * policy.factor ** Math.max(attempt - 1, 0);
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const jitter = base * policy.jitter * Math.random();
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return Math.min(policy.maxMs, Math.round(base + jitter));
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}
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export async function sleepWithAbort(ms: number, abortSignal?: AbortSignal) {
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if (ms <= 0) {
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return;
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}
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try {
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await delay(ms, undefined, { signal: abortSignal });
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} catch (err) {
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if (abortSignal?.aborted) {
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throw new Error("aborted", { cause: err });
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}
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throw err;
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}
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}
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