mirror of
https://github.com/laurent22/joplin.git
synced 2024-12-06 08:36:52 +02:00
60 lines
1.3 KiB
TypeScript
60 lines
1.3 KiB
TypeScript
const ntpClient = require('./vendor/ntp-client');
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import Logger from './Logger';
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const Mutex = require('async-mutex').Mutex;
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let nextSyncTime = 0;
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let timeOffset = 0;
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let logger = new Logger();
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const fetchingTimeMutex = new Mutex();
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const server = {
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domain: 'pool.ntp.org',
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port: 123,
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};
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async function networkTime(): Promise<Date> {
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return new Promise(function(resolve: Function, reject: Function) {
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ntpClient.getNetworkTime(server.domain, server.port, function(error: any, date: Date) {
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if (error) {
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reject(error);
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return;
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}
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resolve(date);
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});
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});
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}
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function shouldSyncTime() {
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return !nextSyncTime || Date.now() > nextSyncTime;
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}
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export function setLogger(v: any) {
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logger = v;
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}
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export default async function(): Promise<Date> {
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if (shouldSyncTime()) {
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const release = await fetchingTimeMutex.acquire();
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try {
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if (shouldSyncTime()) {
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const date = await networkTime();
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nextSyncTime = Date.now() + 60 * 1000;
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timeOffset = date.getTime() - Date.now();
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}
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} catch (error) {
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logger.warn('Could not get NTP time - falling back to device time:', error);
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// Fallback to device time since
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// most of the time it's actually correct
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nextSyncTime = Date.now() + 20 * 1000;
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timeOffset = 0;
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} finally {
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release();
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}
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}
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return new Date(Date.now() + timeOffset);
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}
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