54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
'use strict';
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// This script re-calculates timezone offsets once a day.
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// We need this to be able to send messages using subscriber's local time
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// The best option would be to use built-in timezone data of MySQL but
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// the availability of timezone data is not guaranteed as it's an optional add on.
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// So instead we keep a list of timezone offsets in a table that we can use to
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// JOIN with subscription table. Subscription table includes timezone name for
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// a subscriber and tzoffset table includes offset from UTC in minutes
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const moment = require('moment-timezone');
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const knex = require('../lib/knex');
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const log = require('../lib/log');
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let lastCheck = false;
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const timezone_timeout = 60 * 60 * 1000;
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async function updateTimezoneOffsets() {
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log.verbose('UTC', 'Updating timezone offsets');
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const values = [];
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for (const tz of moment.tz.names()) {
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values.push({
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tz: tz.toLowerCase().trim(),
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offset: moment.tz(tz).utcOffset()
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});
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}
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await knex.transaction(async tx => {
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await tx('tzoffset').del();
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await tx('tzoffset').insert(values);
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});
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}
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function start() {
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let curUtcDate = new Date().toISOString().split('T').shift();
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if (curUtcDate !== lastCheck) {
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updateTimezoneOffsets()
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.then(() => {
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setTimeout(start, timezone_timeout)
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})
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.catch(err => {
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log.error('UTC', err);
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setTimeout(start, timezone_timeout);
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});
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} else {
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setTimeout(start, timezone_timeout);
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}
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lastCheck = curUtcDate;
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}
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module.exports = {
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start
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};
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