Carlos Florêncio
36 lines
816 B
TypeScript
36 lines
816 B
TypeScript
import { dwell } from "./causal-waits";
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const POLL_INTERVAL_MS = 250;
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export async function pollUntil<T>(
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read: () => T | Promise<T>,
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isReady: (value: T) => boolean,
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timeout: number,
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message: string,
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): Promise<T> {
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const deadline = Date.now() + timeout;
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let lastError: unknown;
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while (true) {
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try {
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const value = await read();
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if (isReady(value)) return value;
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lastError = undefined;
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} catch (error) {
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lastError = error;
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}
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const remaining = deadline - Date.now();
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if (remaining <= 0) {
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throw new Error(`${message} within ${timeout}ms`, {
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cause: lastError,
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});
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}
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await dwell(
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Math.min(POLL_INTERVAL_MS, remaining),
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"poll-interval",
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`${message}; the service has not reported the required state`,
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);
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}
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}
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