Crate uuid[−][src]

Generate and parse UUIDs.

Provides support for Universally Unique Identifiers (UUIDs). A UUID is a unique 128-bit number, stored as 16 octets. UUIDs are used to assign unique identifiers to entities without requiring a central allocating authority.

They are particularly useful in distributed systems, though can be used in disparate areas, such as databases and network protocols. Typically a UUID is displayed in a readable string form as a sequence of hexadecimal digits, separated into groups by hyphens.

The uniqueness property is not strictly guaranteed, however for all practical purposes, it can be assumed that an unintentional collision would be extremely unlikely.

Dependencies

By default, this crate depends on nothing but std and cannot generate Uuids. You need to enable the following Cargo features to enable various pieces of functionality:

v1 - adds the Uuid::new_v1 function and the ability to create a V1 using an implementation of UuidV1ClockSequence (usually UuidV1Context) and a timestamp from time::timespec.
v3 - adds the Uuid::new_v3 function and the ability to create a V3 UUID based on the MD5 hash of some data.
v4 - adds the Uuid::new_v4 function and the ability to randomly generate a Uuid.
v5 - adds the Uuid::new_v5 function and the ability to create a V5 UUID based on the SHA1 hash of some data.
serde - adds the ability to serialize and deserialize a Uuid using the serde crate.

By default, uuid can be depended on with:

[dependencies]
uuid = "0.6"

To activate various features, use syntax like:

[dependencies]
uuid = { version = "0.6", features = ["serde", "v4"] }

You can disable default features with:

[dependencies]
uuid = { version = "0.6", default-features = false }

Examples

To parse a UUID given in the simple format and print it as a urn:

use uuid::Uuid;

fn main() {
    let my_uuid = Uuid::parse_str("936DA01F9ABD4d9d80C702AF85C822A8").unwrap();
    println!("{}", my_uuid.urn());
}

To create a new random (V4) UUID and print it out in hexadecimal form:

// Note that this requires the `v4` feature enabled in the uuid crate.

use uuid::Uuid;

fn main() {
    let my_uuid = Uuid::new_v4();
    println!("{}", my_uuid);
}

Strings

Examples of string representations:

simple: 936DA01F9ABD4d9d80C702AF85C822A8
hyphenated: 550e8400-e29b-41d4-a716-446655440000
urn: urn:uuid:F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4

References

Modules

prelude

The uuid prelude.

Structs

Hyphenated	An adaptor for formatting a `Uuid` as a hyphenated string.
Simple	An adaptor for formatting a `Uuid` as a simple string.
Urn	An adaptor for formatting a `Uuid` as a URN string.
Uuid	A Universally Unique Identifier (UUID).
UuidV1Context	A thread-safe, stateful context for the v1 generator to help ensure process-wide uniqueness.

Enums

ParseError	Error details for string parsing failures.
UuidVariant	The reserved variants of UUIDs.
UuidVersion	The version of the UUID, denoting the generating algorithm.

Constants

NAMESPACE_DNS	A UUID of the namespace of fully-qualified domain names
NAMESPACE_OID	A UUID of the namespace of ISO OIDs
NAMESPACE_URL	A UUID of the namespace of URLs
NAMESPACE_X500	A UUID of the namespace of X.500 DNs (in DER or a text output format)

Traits

UuidV1ClockSequence

A trait that abstracts over generation of Uuid v1 "Clock Sequence" values.

Type Definitions

UuidBytes

A 128-bit (16 byte) buffer containing the ID.