scru128 3.2.3

SCRU128: Sortable, Clock and Random number-based Unique identifier
Documentation

SCRU128: Sortable, Clock and Random number-based Unique identifier

Crates.io License

SCRU128 ID is yet another attempt to supersede UUID for the users who need decentralized, globally unique time-ordered identifiers. SCRU128 is inspired by ULID and KSUID and has the following features:

  • 128-bit unsigned integer type
  • Sortable by generation time (as integer and as text)
  • 25-digit case-insensitive textual representation (Base36)
  • 48-bit millisecond Unix timestamp that ensures useful life until year 10889
  • Up to 281 trillion time-ordered but unpredictable unique IDs per millisecond
  • 80-bit three-layer randomness for global uniqueness
// generate a new identifier object
let x = scru128::new();
println!("{}", x); // e.g., "036z951mhjikzik2gsl81gr7l"
println!("{}", x.to_u128()); // as a 128-bit unsigned integer

// generate a textual representation directly
println!("{}", scru128::new_string()); // e.g., "036z951mhzx67t63mq9xe6q0j"

See SCRU128 Specification for details.

Crate features

Default features:

  • std configures Scru128Generator with the system clock. Without std, this crate provides basic SCRU128 primitives available under no_std environments.
  • default_rng (implies std) provides the default random number generator for Scru128Generator and enables the Scru128Generator::new() constructor.
  • global_gen (implies default_rng) provides the process-wide default SCRU128 generator and enables the new() and new_string() functions.
  • rand08: See below.

Optional features:

  • serde enables serialization/deserialization of Scru128Id via serde.
  • rand09 enables an adapter for rand::RngCore to use rand (v0.9) and any other conforming random number generators with Scru128Generator.
  • rand08 enables an adapter for rand::RngCore to use rand (v0.8) and any other conforming random number generators with Scru128Generator. This feature is enabled by default_rng for historical reasons but will be disabled in the future. Enable rand08 explicitly when needed.

License

Licensed under the Apache License, Version 2.0.

See also