souvenir

A type-safe, tagged identifier library.

The crate primarily provides the Id struct, which stores a 128-bit identifier with its corresponding type (tag). The String representation of an Id is the type's tag and the 128-bit value encoded into a variant of Crockford Base 32.

Here is a simple example of how this crate can be used.

use souvenir::{Type, Id};

struct User;

impl Type for User {
// Specify a prefix for all `Id<User>`
const PREFIX: &'static str = "user";
}

let id: Id<User> = Id::random();
println!("{}", id);

let id2: Id<User> = Id::parse("user_02v58c5a3fy30k560qrtg4rb2k").unwrap();
assert_eq!(id2.to_string(), "user_02v58c5a3fy30k560qrtg4rb2k");

Integrations for various libraries and databases are also (optionally) available:

• (De)serialization with serde
• Random ID generation with rand
• Postgres, MySQL, and Sqlite support with sqlx and diesel