UUID-js

A js library to generate and parse UUID's, TimeUUID's and generate empty TimeUUID's based on TimeStamp for range selections.

1var UUID = require('uuid-js');
2
3
4// Generate a V4 UUID
5var uuid4 = UUID.create();
6console.log(uuid4.toString());
7// Prints: 896b677f-fb14-11e0-b14d-d11ca798dbac
8
9
10// Generate a V1 TimeUUID
11var uuid1 = UUID.create(1);
12console.log(uuid1.toString());
13
14
15// First and last possible v1 TimeUUID for a given timestamp:
16var date = new Date().getTime();
17var uuidFirst = UUID.fromTime(date, false);
18var uuidLast = UUID.fromTime(date, true);
19console.log(uuidFirst.toString(), uuidLast.toString());
20// Prints: aa0f9af0-0e1f-11e1-0000-000000000000 aa0f9af0-0e1f-11e1-c0ff-ffffffffffff
21
22
23// Use these TimeUUID's to perform range queries in cassandra:
24var today = new Date().getTime();
25var last30days = (new Date().setDate( today.getDate() - 30 )).getTime();
26
27var rangeStart = UUID.firstFromTime(last30days);
28var rangeEnd = UUID.lastFromTime(today);
29
30var query = ...("select first 50 reversed ?..? from user_twits where key=?", [ rangeStart, rangeEnd, "patricknegri" ]);

Instalation

$ npm install uuid-js

Functions List

These are available just with require and return an instance of the UUID object:

1UUID.create(4); // Generate V4 UUID
2
3UUID.create(1); // Generate V1 TimeUUID
4
5UUID.fromTime(time, last); // Generate a V1 empty TimeUUID from a Date object (Ex: new Date().getTime() )
6
7UUID.firstFromTime(time); // Same as fromTime but first sequence
8
9UUID.lastFromTime(time); // Same as fromTime but last sequence
10
11UUID.fromURN(strId); // Generate a UUID object from string
12
13UUID.fromBytes(ints); // Generate a UUID object from bytes
14
15UUID.fromBinary(binary); // Generate a UUID object from binary

Methods List

These must be called on an instance of the UUID object:

1uuid.fromParts(timeLow, timeMid, timeHiAndVersion, clockSeqHiAndReserved, clockSeqLow, node);
2
3uuid.toString(); // hex string version of UUID
4
5uuid.toURN(); // same as hex, but with urn:uuid prefix
6
7uuid.toBytes(); // converted to an array of bytes

Tests

make test

Contributors

• Christoph Tavan dev@tavan.de

This work was based RFC and by the work of these people.

• LiosK contact@mail.liosk.net
• Gary Dusbabek gdusbabek@gmail.com