simpleflake

node-simpleflake

   

Distributed id generation for the lazy. Inspired by this article.

Generates ids consisting of a 41 bit time (millisecond precision with custom epoch) followed 23 random bits. Result is a Buffer with an added feature of base58 conversion for producing compact and readable strings.

Custom epoch starts on 2000-01-01T00:00:00.000Z, which should be good until around mid-2069.

Install

npm install simpleflake

Test

npm test

Use

Generate an id using current time and a random sequence number:

var flake = require('simpleflake');
var id = flake();                         // <Buffer 34 62 a7 d5 c7 36 7c b9>
id.toString('hex');                       // '3462a7d5c7367cb9'
id.toString('base58');                    // '9mCpPjW7D5a'

Generate an id using deterministic time and sequence:

var id = flake(Date.UTC(2014, 1, 1), 1);  // <Buffer 33 bf f7 7e 00 00 00 01>

Parse an id into its time and sequence components:

flake.parse(id);                          // [ 1396671731598, 3570873 ]
flake.parse('9mCpPjW7D5a', 'base58');     // [ 1396671731598, 3570873 ]

Customise generation options (default values shown):

flake.options.epoch = Date.UTC(2000, 0, 1);
flake.options.timebits = 41;

License

The MIT License (MIT)

Copyright (c) 2014 Simon Ratner

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.