Zaid Abdulla
1e41c72d60
Bundling code now with Rollup for its flat bundling and tree shaking support. Front end code still goes through Webpack for browser support.
65 lines
1.8 KiB
JavaScript
65 lines
1.8 KiB
JavaScript
/**
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* Copyright 2013-2018 Zaid Abdulla
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*
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* This file is part of GenieACS.
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*
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* GenieACS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* GenieACS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with GenieACS. If not, see <http://www.gnu.org/licenses/>.
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*/
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"use strict";
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import crypto from "crypto";
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import later from "later";
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function md532(str) {
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const digest = crypto
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.createHash("md5")
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.update(str)
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.digest();
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return (
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digest.readUInt32LE(0) ^
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digest.readUInt32LE(4) ^
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digest.readUInt32LE(8) ^
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digest.readUInt32LE(12)
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);
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}
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export function variance(deviceId, vrnc) {
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return (md532(deviceId) >>> 0) % vrnc;
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}
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export function interval(timestamp, intrvl, offset = 0) {
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return Math.trunc((timestamp + offset) / intrvl) * intrvl - offset;
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}
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export function parseCron(cronExp) {
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const parts = cronExp.trim().split(/\s+/);
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if (parts.length === 5) parts.unshift("*");
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return later.schedule(later.parse.cron(parts.join(" "), true));
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}
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export function cron(timestamp, schedule, offset = 0) {
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// TODO later.js doesn't throw erorr if expression is invalid!
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const ret = [0, 0];
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const prev = schedule.prev(1, new Date(timestamp + offset));
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if (prev) ret[0] = prev.setMilliseconds(0) - offset;
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const next = schedule.next(1, new Date(timestamp + offset + 1000));
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if (next) ret[1] = next.setMilliseconds(0) - offset;
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return ret;
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}
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