MayLily

distributable, serverless, and customizable unique ID generator based on Snowflake

Features

• distributable / scalable
• no external servers required
• customizable
• supports 2-36 radix
• supports multiple precision integer
• supports CommonJS, ES Modules, TypeScript

How to install

Install by npm.

npm install -S maylily

How to use

No external servers needed. Just import and call maylily()!

JavaScript

Traditional syntax. This code will run on most JavaScript engine.

var maylily = require("maylily");

(function() {
    // returns a Promise object
    maylily()
        .then(function(id) {
            // do something...
        })
        .catch(function(err) {
            // err is instance of Error
        });
}();

ECMAScript 7

Modern syntax. Async/await syntax is easy to read

const maylily = require("maylily");

(async() => { // async syntax / arrow function
    try {
        const id = await maylily(); // await syntax
        // do something...
    }
    catch(err) {
        // err is instance of Error
    }
})();

ES Modules / Babel / TypeScript (import, async/await)

VERY modern syntax!

import maylily from "maylily"; // import syntax

(async() => {
    try {
        const id = await maylily();
        // do something...
    }
    catch(err) {
        // err is instance of Error
    }
})();

How to customize

| name | description | default | |------|-------------|---------| | radix | radix of generated ID (2-36) | 10 | | timeBase | base time in unixtime(millisec) | 946684800000 (2000-01-01T00:00:00Z) | | machineId | identifier of machine; must be unique in service | 0 | | machineBits | required bits to represent machineId | 3 | | generatorId | identifier of generator; must be unique in machine | process ID | | generatorBits | required bits to represent generatorId | 10 | | sequenceBits | required bits to represent sequence | 8 |

Generated value is stringified multiple precision integer (in specified radix).

 000001011100000101111010101110101010111101 001 1101101010 00000110
|------------------------------------------|                         current time from timeBase in millisec
                                           |---|                     machineId (uses machineBits bits)
                                               |----------|          generatorId (uses generatorBits bits)
                                                          |--------| sequence number (uses sequenceBits bits)

example:

// keeps options until next change
maylily({
    timeBase: Date.parse("2017-01-01T00:00:00Z"),   // if your service starts in 2017, this is enough.
    machineBits: 1                                  // if required number machines are up to 2, this is enough.
});

Changelog

See CHANGELOG.md.