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https://github.com/mdipierro/ulid
https://github.com/mdipierro/ulid
Last synced: 20 days ago
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- Host: GitHub
- URL: https://github.com/mdipierro/ulid
- Owner: mdipierro
- License: mit
- Created: 2016-08-01T22:45:48.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2024-08-13T15:42:24.000Z (4 months ago)
- Last Synced: 2024-11-19T08:47:17.634Z (24 days ago)
- Language: Python
- Size: 3.91 KB
- Stars: 48
- Watchers: 3
- Forks: 9
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- starred-awesome - ulid - (Python)
README
# Universally Unique Lexicographically Sortable Identifier
## This page was copied from https://github.com/alizain/ulid
## The code was ported to python from https://github.com/alizain/ulid
## Converted to Python (2 and 3) by Massimo Di Pierro
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)
### Install
```
pip install ulid
```
### Usage
```
import ulid
print ulid.ulid()
```
Below is the current specification of ULID as implemented in this repository. *Note: the binary format has not been implemented.*
```
01AN4Z07BY 79KA1307SR9X4MV3
|----------| |----------------|
Timestamp Randomness
10 chars 16 chars
48bits 80bits
base32 base32
```
### 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. The default ASCII order is used for sorting.
### 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
```
ttttttttttrrrrrrrrrrrrrrrr
where
t is Timestamp
r is Randomness
```
## Test Suite
## Performance