ulid alternatives and similar shards
Based on the "Misc" category.
Alternatively, view ulid alternatives based on common mentions on social networks and blogs.
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sentry
Build/Runs your crystal application, watches files, and rebuilds/restarts app on file changes -
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burocracia.cr
👔 Zero-dependency Crystal shard to validate, generate and format Brazilian burocracias (CPF, CNPJ, CEP) -
wikicr
Wiki in crystal, using Markdown and Git, inspired by dokuwiki. Last features to build are pretty hard, if you have some time to help... :) -
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defined
This shard provides facilities for checking whether a constant exists at compile time, and for a variety of different conditional compilation options. Code can be conditionally compiled based on the existence of a constant, version number constraints, or whether an environment variable is set truthy or not.
InfluxDB - Power Real-Time Data Analytics at Scale
Do you think we are missing an alternative of ulid or a related project?
README
ULID
A Crystal port of alizain/ulid.
[Logo][logo-image]
Universally Unique Lexicographically Sortable Identifier
UUID can be suboptimal for many uses-cases because:
- It isn't the most character efficient way of encoding 128 bits of randomness
- The string format itself is apparently based on the original MAC & time version (UUIDv1 from Wikipedia)
- It provides no other information than randomness
Instead, herein is proposed ULID:
- 128-bit compatibility with UUID
- 1.21e+24 unique ULIDs per millisecond
- Lexicographically sortable!
- Canonically encoded as a 26 character string, as opposed to the 36 character UUID
- Uses Crockford's base32 for better efficiency and readability (5 bits per character)
- Case insensitive
- No special characters (URL safe)
Installation
Add this to your application's shard.yml:
dependencies:
ulid:
github: SuperPaintman/ulid
Usage
require "ulid"
ULID.generate
# => "01B3EAF48P97R8MP9WS6MHDTZ3"
Seed Time
You can also input a seed time which will consistently give you the same string for the time component. This is useful for migrating to ulid.
ULID.generate Time.now + 5.second
# => "01ARYZ6S41TSV4RRFFQ69G5FAV"
Specification
Below is the current specification of ULID as implemented in this repository.
Components
Timestamp
- 48 bit integer
- UNIX-time in milliseconds
- Won't run out of space till the year 10895 AD.
Randomness
- 80 bits
- Cryptographically secure source of randomness, if possible
Sorting
The left-most character must be sorted first, and the right-most character sorted last (lexical order). The default ASCII character set must be used. Within the same millisecond, sort order is not guaranteed
Encoding
Crockford's Base32 is used as shown. This alphabet excludes the letters I, L, O, and U to avoid confusion and abuse.
0123456789ABCDEFGHJKMNPQRSTVWXYZ
Binary Layout and Byte Order
The components are encoded as 16 octets. Each component is encoded with the Most Significant Byte first (network byte order).
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 32_bit_uint_time_low |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 16_bit_uint_time_high | 16_bit_uint_random |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 32_bit_uint_random |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 32_bit_uint_random |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
String Representation
01AN4Z07BY 79KA1307SR9X4MV3
|----------| |----------------|
Timestamp Entropy
10 chars 16 chars
48bits 80bits
base32 base32
Test
crystal spec
Contributing
- Fork it (https://github.com/SuperPaintman/ulid/fork)
- Create your feature branch (
git checkout -b feature/<feature_name>) - Commit your changes (
git commit -am 'Added some feature') - Push to the branch (
git push origin feature/<feature_name>) - Create a new Pull Request
Contributors
- SuperPaintman SuperPaintman - creator, maintainer
API
Changelog
[Changelog][changelog-url]
License
[MIT][license-url]
*Note that all licence references and agreements mentioned in the ulid README section above
are relevant to that project's source code only.