uuid

package module
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README

UUID package for Go language

Build Status Coverage Status GoDoc

This package provides pure Go implementation of Universally Unique Identifier (UUID). Supported both creation and parsing of UUIDs.

With 100% test coverage and benchmarks out of box.

Supported versions:

  • Version 1, based on timestamp and MAC address (RFC 4122)
  • Version 2, based on timestamp, MAC address and POSIX UID/GID (DCE 1.1)
  • Version 3, based on MD5 hashing (RFC 4122)
  • Version 4, based on random numbers (RFC 4122)
  • Version 5, based on SHA-1 hashing (RFC 4122)

Installation

Use the go command:

$ go get github.com/satori/go.uuid

Requirements

UUID package tested against Go >= 1.6.

Example

package main

import (
	"fmt"
	"github.com/satori/go.uuid"
)

func main() {
	// Creating UUID Version 4
	// panic on error
	u1 := uuid.Must(uuid.NewV4())
	fmt.Printf("UUIDv4: %s\n", u1)

	// or error handling
	u2, err := uuid.NewV4()
	if err != nil {
		fmt.Printf("Something went wrong: %s", err)
		return
	}
	fmt.Printf("UUIDv4: %s\n", u2)

	// Parsing UUID from string input
	u2, err := uuid.FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
	if err != nil {
		fmt.Printf("Something went wrong: %s", err)
		return
	}
	fmt.Printf("Successfully parsed: %s", u2)
}

Documentation

Documentation is hosted at GoDoc project.

Copyright (C) 2013-2018 by Maxim Bublis b@codemonkey.ru.

UUID package released under MIT License. See LICENSE for details.

Documentation

Overview

Package uuid provides implementation of Universally Unique Identifier (UUID). Supported versions are 1, 3, 4 and 5 (as specified in RFC 4122) and version 2 (as specified in DCE 1.1).

Index

Constants

View Source 
const (
	V1 byte
	V2
	V3
	V4
	V5
)

UUID versions

View Source 
const (
	VariantNCS byte = iota
	VariantRFC4122
	VariantMicrosoft
	VariantFuture
)

UUID layout variants.

View Source 
const (
	DomainPerson = iota
	DomainGroup
	DomainOrg
)

UUID DCE domains.

View Source 
const Size = 16

Size of a UUID in bytes.

Variables

View Source 
var (
	NamespaceDNS  = Must(FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
	NamespaceURL  = Must(FromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8"))
	NamespaceOID  = Must(FromString("6ba7b812-9dad-11d1-80b4-00c04fd430c8"))
	NamespaceX500 = Must(FromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8"))
)

Predefined namespace UUIDs.

View Source 
var Nil = UUID{}

Nil is special form of UUID that is specified to have all 128 bits set to zero.

Functions

func Equal 

func Equal(u1 UUID, u2 UUID) bool

Equal returns true if u1 and u2 equals, otherwise returns false.

Types

type Generator added in v1.2.0 

type Generator interface {
	NewV1() (UUID, error)
	NewV2(domain byte) (UUID, error)
	NewV3(ns UUID, name string) UUID
	NewV4() (UUID, error)
	NewV5(ns UUID, name string) UUID
}

Generator provides interface for generating UUIDs.

type NullUUID added in v1.1.0 

type NullUUID struct {
	UUID  UUID
	Valid bool
}

NullUUID can be used with the standard sql package to represent a UUID value that can be NULL in the database

func (*NullUUID) Scan added in v1.1.0 

func (u *NullUUID) Scan(src interface{}) error

Scan implements the sql.Scanner interface.

func (NullUUID) Value added in v1.1.0 

func (u NullUUID) Value() (driver.Value, error)

Value implements the driver.Valuer interface.

type UUID 

type UUID [Size]byte

UUID representation compliant with specification described in RFC 4122.

func FromBytes 

func FromBytes(input []byte) (u UUID, err error)

FromBytes returns UUID converted from raw byte slice input. It will return error if the slice isn't 16 bytes long.

func FromBytesOrNil 

func FromBytesOrNil(input []byte) UUID

FromBytesOrNil returns UUID converted from raw byte slice input. Same behavior as FromBytes, but returns a Nil UUID on error.

func FromString 

func FromString(input string) (u UUID, err error)

FromString returns UUID parsed from string input. Input is expected in a form accepted by UnmarshalText.

func FromStringOrNil 

func FromStringOrNil(input string) UUID

FromStringOrNil returns UUID parsed from string input. Same behavior as FromString, but returns a Nil UUID on error.

func Must added in v1.2.0 

func Must(u UUID, err error) UUID

Must is a helper that wraps a call to a function returning (UUID, error) and panics if the error is non-nil. It is intended for use in variable initializations such as 

var packageUUID = uuid.Must(uuid.FromString("123e4567-e89b-12d3-a456-426655440000"));

func NewV1 

func NewV1() (UUID, error)

NewV1 returns UUID based on current timestamp and MAC address.

func NewV2 

func NewV2(domain byte) (UUID, error)

NewV2 returns DCE Security UUID based on POSIX UID/GID.

func NewV3 

func NewV3(ns UUID, name string) UUID

NewV3 returns UUID based on MD5 hash of namespace UUID and name.

func NewV4 

func NewV4() (UUID, error)

NewV4 returns random generated UUID.

func NewV5 

func NewV5(ns UUID, name string) UUID

NewV5 returns UUID based on SHA-1 hash of namespace UUID and name.

func (UUID) Bytes 

func (u UUID) Bytes() []byte

Bytes returns bytes slice representation of UUID.

func (UUID) MarshalBinary 

func (u UUID) MarshalBinary() (data []byte, err error)

MarshalBinary implements the encoding.BinaryMarshaler interface.

func (UUID) MarshalText 

func (u UUID) MarshalText() (text []byte, err error)

MarshalText implements the encoding.TextMarshaler interface. The encoding is the same as returned by String.

func (*UUID) Scan 

func (u *UUID) Scan(src interface{}) error

Scan implements the sql.Scanner interface. A 16-byte slice is handled by UnmarshalBinary, while a longer byte slice or a string is handled by UnmarshalText.

func (*UUID) SetVariant 

func (u *UUID) SetVariant(v byte)

SetVariant sets variant bits.

func (*UUID) SetVersion 

func (u *UUID) SetVersion(v byte)

SetVersion sets version bits.

func (UUID) String 

func (u UUID) String() string

Returns canonical string representation of UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

func (*UUID) UnmarshalBinary 

func (u *UUID) UnmarshalBinary(data []byte) (err error)

UnmarshalBinary implements the encoding.BinaryUnmarshaler interface. It will return error if the slice isn't 16 bytes long.

func (*UUID) UnmarshalText 

func (u *UUID) UnmarshalText(text []byte) (err error)

UnmarshalText implements the encoding.TextUnmarshaler interface. Following formats are supported: 

"6ba7b810-9dad-11d1-80b4-00c04fd430c8",
"{6ba7b810-9dad-11d1-80b4-00c04fd430c8}",
"urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
"6ba7b8109dad11d180b400c04fd430c8"

ABNF for supported UUID text representation follows: 

uuid := canonical | hashlike | braced | urn
plain := canonical | hashlike
canonical := 4hexoct '-' 2hexoct '-' 2hexoct '-' 6hexoct
hashlike := 12hexoct
braced := '{' plain '}'
urn := URN ':' UUID-NID ':' plain
URN := 'urn'
UUID-NID := 'uuid'
12hexoct := 6hexoct 6hexoct
6hexoct := 4hexoct 2hexoct
4hexoct := 2hexoct 2hexoct
2hexoct := hexoct hexoct
hexoct := hexdig hexdig
hexdig := '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' |
          'a' | 'b' | 'c' | 'd' | 'e' | 'f' |
          'A' | 'B' | 'C' | 'D' | 'E' | 'F'

func (UUID) Value 

func (u UUID) Value() (driver.Value, error)

Value implements the driver.Valuer interface.

func (UUID) Variant 

func (u UUID) Variant() byte

Variant returns UUID layout variant.

func (UUID) Version 

func (u UUID) Version() byte

Version returns algorithm version used to generate UUID.

Source Files

View all Source files

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