58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
let availableDomain = 'update.reactnative.cn';
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function ping(domain, rejectImmediate) {
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return new Promise((resolve, reject) => {
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const xhr = new XMLHttpRequest();
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xhr.onreadystatechange = e => {
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if (xhr.readyState !== 4) {
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return;
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}
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if (xhr.status === 200) {
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resolve(domain);
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} else {
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rejectImmediate ? reject() : setTimeout(reject, 5000);
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}
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};
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xhr.open('HEAD', `https://${domain}`);
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xhr.send();
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xhr.timeout = 5000;
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xhr.ontimeout = reject;
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});
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}
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function logger(...args) {
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// console.warn('pushy', ...args);
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}
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export async function tryBackupDomains() {
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try {
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await ping(availableDomain, true);
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logger('main domain ok');
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return;
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} catch (e) {
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logger('main domain failed');
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}
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let backupDomains = [];
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try {
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const resp = await fetch(
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'https://cdn.jsdelivr.net/gh/reactnativecn/react-native-pushy@master/domains.json',
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);
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backupDomains = await resp.json();
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logger('get remote domains:', backupDomains);
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} catch (e) {
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logger('get remote domains failed');
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return;
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}
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const fastestDomain = await Promise.race(backupDomains.map(ping));
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if (typeof fastestDomain === 'string') {
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logger(`pick domain: ${fastestDomain}`);
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availableDomain = fastestDomain;
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} else {
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logger('all remote domains failed');
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}
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}
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export default function getHost() {
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return `https://${availableDomain}/api`;
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}
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