Stan Runge
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40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
import { SourceError, sleep } from './types';
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const UA = 'stanrunge.dev games tracker (personal, self-hosted)';
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/** GET/POST JSON with a timeout, retrying 429/5xx a few times (honouring Retry-After). */
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export async function fetchJson<T = unknown>(
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url: string,
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init: RequestInit & { retries?: number; allow?: number[] } = {}
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): Promise<{ status: number; body: T }> {
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const { retries = 3, allow = [], ...rest } = init;
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for (let attempt = 0; ; attempt++) {
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const res = await fetch(url, {
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...rest,
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headers: { 'User-Agent': UA, Accept: 'application/json', ...(rest.headers ?? {}) },
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signal: AbortSignal.timeout(30_000)
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});
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if ((res.status === 429 || res.status >= 500) && attempt < retries) {
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const after = Number(res.headers.get('retry-after'));
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await sleep(
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Math.min(90, Number.isFinite(after) && after > 0 ? after : 5 * 2 ** attempt) * 1000
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);
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continue;
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}
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const text = await res.text();
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if (!res.ok && !allow.includes(res.status)) {
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throw new SourceError(
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`${res.status} from ${new URL(url).host}${new URL(url).pathname}: ${text.slice(0, 160)}`,
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res.status
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);
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}
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let body: unknown;
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try {
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body = text ? JSON.parse(text) : null;
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} catch {
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body = text;
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}
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return { status: res.status, body: body as T };
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}
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}
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