Struct Uuid

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pub struct Uuid { /* private fields */ }

Expand description

A Universally Unique Identifier (UUID).

Implementations§

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impl Uuid

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pub fn nil() -> Uuid

The ‘nil UUID’.

The nil UUID is special form of UUID that is specified to have all 128 bits set to zero, as defined in IETF RFC 4122 Section 4.1.7.

§Examples

Basic usage:

use uuid::Uuid;

let uuid = Uuid::nil();

assert_eq!(uuid.hyphenated().to_string(),
           "00000000-0000-0000-0000-000000000000");

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pub fn new(v: UuidVersion) -> Option<Uuid>

Creates a new Uuid.

Note that not all versions can be generated currently and None will be returned if the specified version cannot be generated.

To generate a random UUID (UuidVersion::Random), then the v4 feature must be enabled for this crate.

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pub fn new_v4() -> Uuid

Creates a random Uuid.

This uses the rand crate’s default task RNG as the source of random numbers. If you’d like to use a custom generator, don’t use this method: use the rand::Rand trait’s rand() method instead.

Note that usage of this method requires the v4 feature of this crate to be enabled.

§Examples

Basic usage:

use uuid::Uuid;

let uuid = Uuid::new_v4();

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pub fn from_fields( d1: u32, d2: u16, d3: u16, d4: &[u8], ) -> Result<Uuid, ParseError>

Creates a Uuid from four field values.

§Errors

This function will return an error if d4’s length is not 8 bytes.

§Examples

Basic usage:

use uuid::Uuid;

let d4 = [12, 3, 9, 56, 54, 43, 8, 9];

let uuid = Uuid::from_fields(42, 12, 5, &d4);
let uuid = uuid.map(|uuid| uuid.hyphenated().to_string());

let expected_uuid = Ok(String::from("0000002a-000c-0005-0c03-0938362b0809"));

assert_eq!(expected_uuid, uuid);

An invalid length:

use uuid::Uuid;
use uuid::ParseError;

let d4 = [12];

let uuid = Uuid::from_fields(42, 12, 5, &d4);

let expected_uuid = Err(ParseError::InvalidLength(1));

assert_eq!(expected_uuid, uuid);

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pub fn from_bytes(b: &[u8]) -> Result<Uuid, ParseError>

Creates a Uuid using the supplied bytes.

§Errors

This function will return an error if b has any length other than 16.

§Examples

Basic usage:

use uuid::Uuid;

let bytes = [4, 54, 67, 12, 43, 2, 98, 76,
             32, 50, 87, 5, 1, 33, 43, 87];

let uuid = Uuid::from_bytes(&bytes);
let uuid = uuid.map(|uuid| uuid.hyphenated().to_string());

let expected_uuid = Ok(String::from("0436430c-2b02-624c-2032-570501212b57"));

assert_eq!(expected_uuid, uuid);

An incorrect number of bytes:

use uuid::Uuid;
use uuid::ParseError;

let bytes = [4, 54, 67, 12, 43, 2, 98, 76];

let uuid = Uuid::from_bytes(&bytes);

let expected_uuid = Err(ParseError::InvalidLength(8));

assert_eq!(expected_uuid, uuid);

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pub fn get_variant(&self) -> Option<UuidVariant>

Returns the variant of the Uuid structure.

This determines the interpretation of the structure of the UUID. Currently only the RFC4122 variant is generated by this module.

Variant Reference

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pub fn get_version_num(&self) -> usize

Returns the version number of the Uuid.

This represents the algorithm used to generate the contents.

Currently only the Random (V4) algorithm is supported by this module. There are security and privacy implications for using older versions - see Wikipedia: Universally Unique Identifier for details.

Version Reference

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pub fn get_version(&self) -> Option<UuidVersion>

Returns the version of the Uuid.

This represents the algorithm used to generate the contents

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pub fn as_bytes(&self) -> &[u8; 16]

Return an array of 16 octets containing the UUID data

§Examples

use uuid::Uuid;

let uuid = Uuid::nil();
assert_eq!(uuid.as_bytes(), &[0; 16]);

let uuid = Uuid::parse_str("936DA01F9ABD4d9d80C702AF85C822A8").unwrap();
assert_eq!(uuid.as_bytes(),
           &[147, 109, 160, 31, 154, 189, 77, 157,
             128, 199, 2, 175, 133, 200, 34, 168]);

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pub fn simple(&self) -> Simple<'_>

Returns a wrapper which when formatted via fmt::Display will format a string of 32 hexadecimal digits.

§Examples

use uuid::Uuid;

let uuid = Uuid::nil();
assert_eq!(uuid.simple().to_string(),
           "00000000000000000000000000000000");

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pub fn hyphenated(&self) -> Hyphenated<'_>

Returns a wrapper which when formatted via fmt::Display will format a string of hexadecimal digits separated into groups with a hyphen.

§Examples

use uuid::Uuid;

let uuid = Uuid::nil();
assert_eq!(uuid.hyphenated().to_string(),
           "00000000-0000-0000-0000-000000000000");

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pub fn urn(&self) -> Urn<'_>

Returns a wrapper which when formatted via fmt::Display will format a string of the UUID as a full URN string.

§Examples

use uuid::Uuid;

let uuid = Uuid::nil();
assert_eq!(uuid.urn().to_string(),
           "urn:uuid:00000000-0000-0000-0000-000000000000");

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pub fn to_timestamp(&self) -> Option<(u64, u16)>

Returns an Optional Tuple of (u64, u16) representing the timestamp and counter portion of a V1 UUID. If the supplied UUID is not V1, this will return None

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