sid.js

/**
 * Copyright (c) 2022 | LuciferMorningstarDev <contact@lucifer-morningstar.dev>
 * Copyright (C) 2022 | Pharaoh & Morningstar LLC team and contributors
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import { hexToDec } from './lib/hex2dec';

export default class SnowflakeId {
    constructor(options) {
        options = options || {};
        this.seq = 0;
        this.mid = (options.mid || 1) % 1023;
        this.timeOffset = options.timeOffset || 0;
        this.lastTime = 0;
    }
    gen() {
        const time = Date.now(),
            bTime = (time - this.timeOffset).toString(2);

        //get the sequence number
        if (this.lastTime == time) {
            this.seq++;

            if (this.seq > 4095) {
                this.seq = 0;

                //make system wait till time is been shifted by one millisecond
                while (Date.now() <= time) {}
            }
        } else {
            this.seq = 0;
        }

        this.lastTime = time;

        let bSeq = this.seq.toString(2),
            bMid = this.mid.toString(2);

        //create sequence binary bit
        while (bSeq.length < 12) bSeq = '0' + bSeq;

        while (bMid.length < 10) bMid = '0' + bMid;

        const bid = bTime + bMid + bSeq;
        let id = '';

        for (let i = bid.length; i > 0; i -= 4) {
            id = parseInt(bid.substring(i - 4, i), 2).toString(16) + id;
        }

        return hexToDec(id);
    }
}