Generate and parse UUIDs.
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bors[bot] and Wolfgang Silbermayr Merge #353
353: Update md5 0.5 to 0.6 r=Dylan-DPC a=silwol

# Description
This patch updates the `md5` dependency from 0.5 to 0.6. The API of the `md5` crate is not exposed in `uuid`, just used in one single method which uses it internally, so this is not a semver breaking change.

Co-authored-by: Wolfgang Silbermayr <wolfgang@silbermayr.at>
Latest commit c5b1fb7 Dec 5, 2018

README.md

uuid

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A Rust library to 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.

Documentation

Usage

Add this to your Cargo.toml:

[dependencies]
uuid = "0.7"

and this to your crate root:

extern crate uuid;

Examples

To parse a simple UUID, then print the version and urn string format:

extern crate uuid;
use uuid::Uuid;

fn main() {
    let my_uuid = Uuid::parse_str("936DA01F9ABD4d9d80C702AF85C822A8").unwrap();
    println!("Parsed a version {} UUID.", my_uuid.get_version_num());
    println!("{}", my_uuid);
}

The library supports 5 versions of UUID:

Name Version
Mac Version 1: MAC address
Dce Version 2: DCE Security
Md5 Version 3: MD5 hash
Random Version 4: Random
Sha1 Version 5: SHA-1 hash

To create a new random (V4) UUID and print it out in hexadecimal form, first you'll need to change how you depend on uuid:

[dependencies]
uuid = { version = "0.7", features = ["v4"] }

Next, you'll write:

extern crate uuid;
use uuid::Uuid;

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

To create a new sha1-hash based (V5) UUID and print it out in hexadecimal form, you'll also need to change how you depend on uuid:

[dependencies]
uuid = { version = "0.7", features = ["v5"] }

Next, you'll write:

extern crate uuid;
use uuid::Uuid;

fn main() {
    let my_uuid = Uuid::new_v5(&Uuid::NAMESPACE_DNS, "foo".as_bytes());
    println!("{}", my_uuid);
}

References

Wikipedia: Universally Unique Identifier