Aaron
53 lines
1.3 KiB
TypeScript
53 lines
1.3 KiB
TypeScript
import dns from 'node:dns';
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import { ResolvedConfig } from '~/types';
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import { withTimeout } from './time';
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function isOffline(): Promise<boolean> {
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const isOffline = new Promise<boolean>((res) => {
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dns.resolve('google.com', (err) => {
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if (err == null) {
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res(false);
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} else {
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res(true);
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}
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});
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});
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return withTimeout(isOffline, 1e3).catch(() => true);
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}
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export async function isOnline(): Promise<boolean> {
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const offline = await isOffline();
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return !offline;
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}
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/**
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* Fetches a URL with a simple GET request. Grabs it from cache if it doesn't exist, or throws an
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* error if it can't be resolved via the network or cache.
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*/
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export async function fetchCached(
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url: string,
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config: Omit<ResolvedConfig, 'builder'>,
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): Promise<string> {
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let content: string = '';
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if (await isOnline()) {
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const res = await fetch(url);
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if (res.status < 300) {
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content = await res.text();
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await config.fsCache.set(url, content);
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} else {
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config.logger.debug(
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`Failed to download "${url}", falling back to cache...`,
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);
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}
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}
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if (!content) content = (await config.fsCache.get(url)) ?? '';
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if (!content)
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throw Error(
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`Offline and "${url}" has not been cached. Try again when online.`,
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);
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return content;
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}
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