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joplin/packages/lib/ntpDate.ts
2021-01-22 17:41:11 +00:00

60 lines
1.3 KiB
TypeScript

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