Crate uid_store

Generate random uid strings containing letters, numbers, or base62 values.

This module provides a way to generate various types of random strings that can be used as a UID. It also allows generation of UID strings that are base62 representation of numbers to allow for converstion to and from u16, u32, and u64.

The UidStore struct provides helper functions that helps avoid generation of duplicate uid values, which becomes very likely when using short UID’s.

Standalone functions to generate random strings:

let uid = random_string(8);
let uid = random_number(10);
let uid = human_random_string(8);

Convert a number to and from a base62 uid:

let uid = number_to_uid(1000);
let number = uid_to_number(&uid).unwrap();

Generate a sequence of UID’s that should be unique:

let mut u = UidStore::new();
let uid = u.next(6);
let uid = u.next_u16();
let uid = u.next_u32();
let uid = u.next_u64();

Initialise a UidStore with a sequence of previously generated uid values.

let mut u = UidStore::new();
u.make_unique("ifh983u");
u.make_unique("Rig3hGa");
u.make_unique("h84gh8A");
u.make_unique("h84gh8A"); // Duplicate uid triggers new uid generation

Notice above that make_unique was passed the same UID twice, when this happened, a new UID was generated and returned. This should be handled:

if let Some(deduplicate) = u.make_unique("h84gh8A") {
    println!("Duplicate UID for item replaced with: {}", deduplicate);
}

Structs

• UidStore
  UidStore holds a collection of previously generated UID values to ensure a value is only ever generated once.

Functions

• human_random_string
  Generate a random string that doedn’t include easily confused characters such as i,I,1 and o,O,0.
• number_to_uid
  Convert the contents of a base62 string back to the number that was used to generate the string. Reverse using uid_to_number().
• random_max_size
  Generate a base62 string using a random number no larger than a specified maximum size.
• random_number
  Generate a string of numbers with the specified length.
• random_string
  Generate a random base62 string with a fixed string length.
• uid_to_number
  Convert a base62 string into the underlying number it represents. Returns None if the string is not a valid base62 number. Reverse using number_to_uid().