dart-uuid
Simple, fast generation of RFC4122 UUIDS.
Heavily based on node-uuid by Robert Kieffer (I even copied this readme over and modified it.) Primarily becaue it works, well written, and so on.
Features:
- Generate RFC4122 version 1, version 4, or version 5 UUIDs
- Runs in dartvm and hopefully browsers too.
- Cryptographically strong random # generation on all platforms
- Annotated source code
Getting Started
Notes on Windows (currently)
- Use cmd for pub
- When actually running an application add // to the beginning of your Package-root directory (Issue 4534)
Instructions
- Install and configure pub (http://www.dartlang.org/docs/pub-package-manager/#installing-and-configuring-pub)
- Open a command line and cd to your projects root folder
- In your pubspec, add an entry for dart-uuid to your dependencies (example below)
- pub install
- If you wish to run tests, go into packages/dart-uuid/ and run 'dart test/uuid_test.dart'
Pubspec
There are 2 options. Directly from git, or from pub.dartlang.org
pub.dartlang.org: (you can use 'any' instead of a version if you just want the latest always)
dependencies:
uuid: 0.2.0
directly from github:
dependencies:
uuid:
git: https://github.com/Daegalus/dart-uuid.git
#import('https://raw.github.com/Daegalus/dart-uuid/master/lib/uuid.dart'); //pulls it directly from github.
// OR
#import('package:uuid/uuid.dart'); //Uses the local one in ./packages/uuid/lib/uuid.dart
var uuid = new Uuid();
Then create some ids ...
// Generate a v1 (time-based) id
uuid.v1(); // -> '6c84fb90-12c4-11e1-840d-7b25c5ee775a'
// Generate a v4 (random) id
uuid.v4(); // -> '110ec58a-a0f2-4ac4-8393-c866d813b8d1'
// Generate a v5 (namespace-name-sha1-based) id
uuid.v5(uuid.NAMESPACE_URL, 'www.google.com'); // -> 'c74a196f-f19d-5ea9-bffd-a2742432fc9c'
API
uuid.v1({Map options: null, List buffer: null, int offset: 0})
Generate and return a RFC4122 v1 (timestamp-based) UUID.
-
options
- (Map) Optional uuid state to apply. Properties may include:node
- (List) Node id as List of 6 bytes (per 4.1.6). Default: Randomnly generated ID.clockseq
- (Number between 0 - 0x3fff) RFC clock sequence. Default: An internally maintained clockseq is used.msecs
- (Number) Time in milliseconds since unix Epoch. Default: The current time is used.nsecs
- (Number between 0-9999) additional time, in 100-nanosecond units. Ignored ifmsecs
is unspecified. Default: internal uuid counter is used, as per 4.2.1.2.
-
buffer
- (List) Array or buffer where UUID bytes are to be written. -
offset
- (Int) Starting index inbuffer
at which to begin writing.
Returns buffer
, if specified, otherwise the string form of the UUID
Example: Generate string UUID with fully-specified options
uuid.v1(options: {
'node': [0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
'clockSeq': 0x1234,
'mSecs': new Date(2011,11,01).millisecondsSinceEpoch,
'nSecs': 5678
}) // -> "1d6a6e2e-0457-11e1-9234-0123456789ab"
Example: In-place generation of two binary IDs
// Generate two ids in an array
var myBuffer = new List(32); // -> []
uuid.v1(buffer: myBuffer);
// -> [115, 189, 5, 128, 201, 91, 17, 225, 146, 52, 109, 0, 9, 0, 52, 128, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]
uuid.v1(buffer: myBuffer, offset: 16);
// -> [115, 189, 5, 128, 201, 91, 17, 225, 146, 52, 109, 0, 9, 0, 52, 128, 115, 189, 5, 129, 201, 91, 17, 225, 146, 52, 109, 0, 9, 0, 52, 128]
// Optionally use uuid.unparse() to get stringify the ids
uuid.unparse(buffer: myBuffer); // -> '73bd0580-c95b-11e1-9234-6d0009003480'
uuid.unparse(buffer: myBuffer, offset: 16) // -> '73bd0581-c95b-11e1-9234-6d0009003480'
uuid.v4({Map options: null, List buffer: null, int offset: 0})
Generate and return a RFC4122 v4 UUID.
-
options
- (Map) Optional uuid state to apply. Properties may include:random
- (Number[16]) List of 16 numbers (0-255) to use in place of randomly generated valuesrng
- (Function) Random # generator to use. A Custom function that returns an list[16] of byte values or 1 of 2 provided.
-
buffer
- (List) Array or buffer where UUID bytes are to be written. -
offset
- (Number) Starting index inbuffer
at which to begin writing.
Returns buffer
, if specified, otherwise the string form of the UUID
Example: Generate string UUID with fully-specified options
uuid.v4(options: {
'random': [
0x10, 0x91, 0x56, 0xbe, 0xc4, 0xfb, 0xc1, 0xea,
0x71, 0xb4, 0xef, 0xe1, 0x67, 0x1c, 0x58, 0x36
]
});
// -> "109156be-c4fb-41ea-b1b4-efe1671c5836"
Example: Generate two IDs in a single buffer
var myBuffer = new List(32);
uuid.v4(buffer: myBuffer);
uuid.v4(buffer: myBuffer, offset: 16);
uuid.v5(String namespace, String name, {Map options: null, List buffer: null, int offset: 0})
Generate and return a RFC4122 v5 UUID.
-
options
- (Map) Optional uuid state to apply. Properties may include:randomNamespace
- (Boolean) Default True. Returns if you want a v4 generated namespace (true) or NAMESPACE_NIL (false)
-
buffer
- (List) Array or buffer where UUID bytes are to be written. -
offset
- (Number) Starting index inbuffer
at which to begin writing.
Returns buffer
, if specified, otherwise the string form of the UUID
Example: Generate string UUID with fully-specified options
uuid.v5(uuid.NAMESPACE_URL, 'www.google.com');
// -> "c74a196f-f19d-5ea9-bffd-a2742432fc9c"
Example: Generate two IDs in a single buffer
var myBuffer = new List(32);
uuid.v5(uuid.NAMESPACE_URL, 'www.google.com', buffer: myBuffer);
uuid.v5(uuid.NAMESPACE_URL, 'www.google.com', buffer: myBuffer, offset: 16);
uuid.parse(String uuid, {List buffer: null, int offset: 0})
uuid.unparse(List buffer, {int offset: 0})
Parse and unparse UUIDs
id
- (String) UUID(-like) stringbuffer
- (List) Array or buffer where UUID bytes are to be written. Default: A new Array or Buffer is usedoffset
- (Int | Number) Starting index inbuffer
at which to begin writing. Default: 0
Example parsing and unparsing a UUID string
var bytes = uuid.parse('797ff043-11eb-11e1-80d6-510998755d10'); // -> [121, 127, 240, 67, 17, 235, 17, 225, 128, 214, 81, 9, 152, 117, 93, 16]
var string = uuid.unparse(bytes); // -> '797ff043-11eb-11e1-80d6-510998755d10'
Testing
In dartvm
dart test\uuid_test.dart
In Browser
N/A as I have not used or tested this in the browser.
Benchmarking
Not ready for this yet. My code is probably inefficient and messy in many areas. Though it should be pretty quick.
Release notes
See CHANGELOG