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# UUID package for Go language
[![Build Status](https://travis-ci.org/satori/go.uuid.png?branch=master)](https://travis-ci.org/satori/go.uuid)
[![GoDoc](http://godoc.org/github.com/satori/go.uuid?status.png)](http://godoc.org/github.com/satori/go.uuid)
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 requires any stable version of Go Programming Language.
It is tested against following versions of Go: 1.0, 1.1, 1.2
## Example
```go
package main
import (
"fmt"
"github.com/satori/go.uuid"
)
func main() {
// Creating UUID Version 4
u1 := uuid.NewV4()
fmt.Printf("UUIDv4: %s\n", u1)
// Parsing UUID from string input
u2, err := uuid.FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
if err != nil {
fmt.Printf("Something gone wrong: %s", err)
}
fmt.Printf("Successfully parsed: %s", u2)
}
```
## Documentation
[Documentation](http://godoc.org/github.com/satori/go.uuid) is hosted at GoDoc project.
## Links
* [RFC 4122](http://tools.ietf.org/html/rfc4122)
* [DCE 1.1: Authentication and Security Services](http://pubs.opengroup.org/onlinepubs/9696989899/chap5.htm#tagcjh_08_02_01_01)
## Copyright
Copyright (C) 2013 by Maxim Bublis <b@codemonkey.ru>.
UUID package released under MIT License.
See [LICENSE](https://github.com/satori/go.uuid/blob/master/LICENSE) for details.

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// Copyright (C) 2013 by Maxim Bublis <b@codemonkey.ru>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package uuid
import (
"testing"
)
func BenchmarkFromBytes(b *testing.B) {
bytes := []byte{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
for i := 0; i < b.N; i++ {
FromBytes(bytes)
}
}
func BenchmarkFromString(b *testing.B) {
s := "6ba7b810-9dad-11d1-80b4-00c04fd430c8"
for i := 0; i < b.N; i++ {
FromString(s)
}
}
func BenchmarkFromStringUrn(b *testing.B) {
s := "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
for i := 0; i < b.N; i++ {
FromString(s)
}
}
func BenchmarkFromStringWithBrackets(b *testing.B) {
s := "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}"
for i := 0; i < b.N; i++ {
FromString(s)
}
}
func BenchmarkNewV1(b *testing.B) {
for i := 0; i < b.N; i++ {
NewV1()
}
}
func BenchmarkNewV2(b *testing.B) {
for i := 0; i < b.N; i++ {
NewV2(DomainPerson)
}
}
func BenchmarkNewV3(b *testing.B) {
for i := 0; i < b.N; i++ {
NewV3(NamespaceDNS, "www.example.com")
}
}
func BenchmarkNewV4(b *testing.B) {
for i := 0; i < b.N; i++ {
NewV4()
}
}
func BenchmarkNewV5(b *testing.B) {
for i := 0; i < b.N; i++ {
NewV5(NamespaceDNS, "www.example.com")
}
}

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// Copyright (C) 2013 by Maxim Bublis <b@codemonkey.ru>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 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).
package uuid
import (
"bytes"
"crypto/md5"
"crypto/rand"
"crypto/sha1"
"encoding/binary"
"encoding/hex"
"fmt"
"hash"
"net"
"os"
"strings"
"sync"
"time"
)
// UUID layout variants.
const (
VariantNCS = iota
VariantRFC4122
VariantMicrosoft
VariantFuture
)
// UUID DCE domains.
const (
DomainPerson = iota
DomainGroup
DomainOrg
)
// Difference in 100-nanosecond intervals between
// UUID epoch (October 15, 1582) and Unix epoch (January 1, 1970).
const epochStart = 122192928000000000
// UUID v1/v2 storage.
var (
storageMutex sync.Mutex
clockSequence uint16
lastTime uint64
hardwareAddr [6]byte
posixUID = uint32(os.Getuid())
posixGID = uint32(os.Getgid())
)
// Epoch calculation function
var epochFunc func() uint64
// Initialize storage
func init() {
buf := make([]byte, 2)
rand.Read(buf)
clockSequence = binary.BigEndian.Uint16(buf)
// Initialize hardwareAddr randomly in case
// of real network interfaces absence
rand.Read(hardwareAddr[:])
// Set multicast bit as recommended in RFC 4122
hardwareAddr[0] |= 0x01
interfaces, err := net.Interfaces()
if err == nil {
for _, iface := range interfaces {
if len(iface.HardwareAddr) >= 6 {
copy(hardwareAddr[:], iface.HardwareAddr)
break
}
}
}
epochFunc = unixTimeFunc
}
// Returns difference in 100-nanosecond intervals between
// UUID epoch (October 15, 1582) and current time.
// This is default epoch calculation function.
func unixTimeFunc() uint64 {
return epochStart + uint64(time.Now().UnixNano()/100)
}
// UUID representation compliant with specification
// described in RFC 4122.
type UUID [16]byte
// Predefined namespace UUIDs.
var (
NamespaceDNS, _ = FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
NamespaceURL, _ = FromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
NamespaceOID, _ = FromString("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
NamespaceX500, _ = FromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8")
)
// And returns result of binary AND of two UUIDs.
func And(u1 UUID, u2 UUID) UUID {
u := UUID{}
for i := 0; i < 16; i++ {
u[i] = u1[i] & u2[i]
}
return u
}
// Or returns result of binary OR of two UUIDs.
func Or(u1 UUID, u2 UUID) UUID {
u := UUID{}
for i := 0; i < 16; i++ {
u[i] = u1[i] | u2[i]
}
return u
}
// Equal returns true if u1 and u2 equals, otherwise returns false.
func Equal(u1 UUID, u2 UUID) bool {
return bytes.Equal(u1[:], u2[:])
}
// Version returns algorithm version used to generate UUID.
func (u UUID) Version() uint {
return uint(u[6] >> 4)
}
// Variant returns UUID layout variant.
func (u UUID) Variant() uint {
switch {
case (u[8] & 0x80) == 0x00:
return VariantNCS
case (u[8]&0xc0)|0x80 == 0x80:
return VariantRFC4122
case (u[8]&0xe0)|0xc0 == 0xc0:
return VariantMicrosoft
}
return VariantFuture
}
// Bytes returns bytes slice representation of UUID.
func (u UUID) Bytes() []byte {
return u[:]
}
// Returns canonical string representation of UUID:
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
func (u UUID) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x",
u[:4], u[4:6], u[6:8], u[8:10], u[10:])
}
// SetVersion sets version bits.
func (u *UUID) SetVersion(v byte) {
u[6] = (u[6] & 0x0f) | (v << 4)
}
// SetVariant sets variant bits as described in RFC 4122.
func (u *UUID) SetVariant() {
u[8] = (u[8] & 0xbf) | 0x80
}
// MarshalText implements the encoding.TextMarshaler interface.
// The encoding is the same as returned by String.
func (u UUID) MarshalText() (text []byte, err error) {
text = []byte(u.String())
return
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// UUID is expected in a form accepted by FromString.
func (u *UUID) UnmarshalText(text []byte) error {
s := string(text)
u2, err := FromString(s)
if err != nil {
return err
}
*u = u2
return nil
}
// MarshalBinary implements the encoding.BinaryMarshaler interface.
func (u UUID) MarshalBinary() (data []byte, err error) {
data = u.Bytes()
return
}
// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
func (u *UUID) UnmarshalBinary(data []byte) error {
u2, err := FromBytes(data)
if err != nil {
return err
}
*u = u2
return nil
}
// FromBytes returns UUID converted from raw byte slice input.
// It will return error if the slice isn't 16 bytes long.
func FromBytes(input []byte) (u UUID, err error) {
if len(input) != 16 {
err = fmt.Errorf("uuid: UUID must be exactly 16 bytes long, got %d bytes", len(input))
return
}
copy(u[:], input)
return
}
// FromString returns UUID parsed from string input.
// Following formats are supported:
// "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
// "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}",
// "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
func FromString(input string) (u UUID, err error) {
s := strings.Replace(input, "-", "", -1)
if len(s) == 41 && s[:9] == "urn:uuid:" {
s = s[9:]
} else if len(s) == 34 && s[0] == '{' && s[33] == '}' {
s = s[1:33]
}
if len(s) != 32 {
err = fmt.Errorf("uuid: invalid UUID string: %s", input)
return
}
b := []byte(s)
_, err = hex.Decode(u[:], b)
return
}
// Returns UUID v1/v2 storage state.
// Returns epoch timestamp and clock sequence.
func getStorage() (uint64, uint16) {
storageMutex.Lock()
defer storageMutex.Unlock()
timeNow := epochFunc()
// Clock changed backwards since last UUID generation.
// Should increase clock sequence.
if timeNow <= lastTime {
clockSequence++
}
lastTime = timeNow
return timeNow, clockSequence
}
// NewV1 returns UUID based on current timestamp and MAC address.
func NewV1() UUID {
u := UUID{}
timeNow, clockSeq := getStorage()
binary.BigEndian.PutUint32(u[0:], uint32(timeNow))
binary.BigEndian.PutUint16(u[4:], uint16(timeNow>>32))
binary.BigEndian.PutUint16(u[6:], uint16(timeNow>>48))
binary.BigEndian.PutUint16(u[8:], clockSeq)
copy(u[10:], hardwareAddr[:])
u.SetVersion(1)
u.SetVariant()
return u
}
// NewV2 returns DCE Security UUID based on POSIX UID/GID.
func NewV2(domain byte) UUID {
u := UUID{}
switch domain {
case DomainPerson:
binary.BigEndian.PutUint32(u[0:], posixUID)
case DomainGroup:
binary.BigEndian.PutUint32(u[0:], posixGID)
}
timeNow, clockSeq := getStorage()
binary.BigEndian.PutUint16(u[4:], uint16(timeNow>>32))
binary.BigEndian.PutUint16(u[6:], uint16(timeNow>>48))
binary.BigEndian.PutUint16(u[8:], clockSeq)
u[9] = domain
copy(u[10:], hardwareAddr[:])
u.SetVersion(2)
u.SetVariant()
return u
}
// NewV3 returns UUID based on MD5 hash of namespace UUID and name.
func NewV3(ns UUID, name string) UUID {
u := newFromHash(md5.New(), ns, name)
u.SetVersion(3)
u.SetVariant()
return u
}
// NewV4 returns random generated UUID.
func NewV4() UUID {
u := UUID{}
rand.Read(u[:])
u.SetVersion(4)
u.SetVariant()
return u
}
// NewV5 returns UUID based on SHA-1 hash of namespace UUID and name.
func NewV5(ns UUID, name string) UUID {
u := newFromHash(sha1.New(), ns, name)
u.SetVersion(5)
u.SetVariant()
return u
}
// Returns UUID based on hashing of namespace UUID and name.
func newFromHash(h hash.Hash, ns UUID, name string) UUID {
u := UUID{}
h.Write(ns[:])
h.Write([]byte(name))
copy(u[:], h.Sum(nil))
return u
}

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// Copyright (C) 2013 by Maxim Bublis <b@codemonkey.ru>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package uuid
import (
"bytes"
"testing"
)
func TestBytes(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
bytes1 := []byte{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
if !bytes.Equal(u.Bytes(), bytes1) {
t.Errorf("Incorrect bytes representation for UUID: %s", u)
}
}
func TestString(t *testing.T) {
if NamespaceDNS.String() != "6ba7b810-9dad-11d1-80b4-00c04fd430c8" {
t.Errorf("Incorrect string representation for UUID: %s", NamespaceDNS.String())
}
}
func TestEqual(t *testing.T) {
if !Equal(NamespaceDNS, NamespaceDNS) {
t.Errorf("Incorrect comparison of %s and %s", NamespaceDNS, NamespaceDNS)
}
if Equal(NamespaceDNS, NamespaceURL) {
t.Errorf("Incorrect comparison of %s and %s", NamespaceDNS, NamespaceURL)
}
}
func TestOr(t *testing.T) {
u1 := UUID{0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff}
u2 := UUID{0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00}
u := UUID{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
if !Equal(u, Or(u1, u2)) {
t.Errorf("Incorrect bitwise OR result %s", Or(u1, u2))
}
}
func TestAnd(t *testing.T) {
u1 := UUID{0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff}
u2 := UUID{0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00}
u := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if !Equal(u, And(u1, u2)) {
t.Errorf("Incorrect bitwise AND result %s", And(u1, u2))
}
}
func TestVersion(t *testing.T) {
u := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if u.Version() != 1 {
t.Errorf("Incorrect version for UUID: %d", u.Version())
}
}
func TestSetVersion(t *testing.T) {
u := UUID{}
u.SetVersion(4)
if u.Version() != 4 {
t.Errorf("Incorrect version for UUID after u.setVersion(4): %d", u.Version())
}
}
func TestVariant(t *testing.T) {
u1 := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if u1.Variant() != VariantNCS {
t.Errorf("Incorrect variant for UUID variant %d: %d", VariantNCS, u1.Variant())
}
u2 := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if u2.Variant() != VariantRFC4122 {
t.Errorf("Incorrect variant for UUID variant %d: %d", VariantRFC4122, u2.Variant())
}
u3 := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if u3.Variant() != VariantMicrosoft {
t.Errorf("Incorrect variant for UUID variant %d: %d", VariantMicrosoft, u3.Variant())
}
u4 := UUID{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
if u4.Variant() != VariantFuture {
t.Errorf("Incorrect variant for UUID variant %d: %d", VariantFuture, u4.Variant())
}
}
func TestSetVariant(t *testing.T) {
u := new(UUID)
u.SetVariant()
if u.Variant() != VariantRFC4122 {
t.Errorf("Incorrect variant for UUID after u.setVariant(): %d", u.Variant())
}
}
func TestFromBytes(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b1 := []byte{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
u1, err := FromBytes(b1)
if err != nil {
t.Errorf("Error parsing UUID from bytes: %s", err)
}
if !Equal(u, u1) {
t.Errorf("UUIDs should be equal: %s and %s", u, u1)
}
b2 := []byte{}
_, err = FromBytes(b2)
if err == nil {
t.Errorf("Should return error parsing from empty byte slice, got %s", err)
}
}
func TestMarshalBinary(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b1 := []byte{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b2, err := u.MarshalBinary()
if err != nil {
t.Errorf("Error marshaling UUID: %s", err)
}
if !bytes.Equal(b1, b2) {
t.Errorf("Marshaled UUID should be %s, got %s", b1, b2)
}
}
func TestUnmarshalBinary(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b1 := []byte{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
u1 := UUID{}
err := u1.UnmarshalBinary(b1)
if err != nil {
t.Errorf("Error unmarshaling UUID: %s", err)
}
if !Equal(u, u1) {
t.Errorf("UUIDs should be equal: %s and %s", u, u1)
}
b2 := []byte{}
u2 := UUID{}
err = u2.UnmarshalBinary(b2)
if err == nil {
t.Errorf("Should return error unmarshalling from empty byte slice, got %s", err)
}
}
func TestFromString(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
s1 := "6ba7b810-9dad-11d1-80b4-00c04fd430c8"
s2 := "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}"
s3 := "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
_, err := FromString("")
if err == nil {
t.Errorf("Should return error trying to parse empty string, got %s", err)
}
u1, err := FromString(s1)
if err != nil {
t.Errorf("Error parsing UUID from string: %s", err)
}
if !Equal(u, u1) {
t.Errorf("UUIDs should be equal: %s and %s", u, u1)
}
u2, err := FromString(s2)
if err != nil {
t.Errorf("Error parsing UUID from string: %s", err)
}
if !Equal(u, u2) {
t.Errorf("UUIDs should be equal: %s and %s", u, u2)
}
u3, err := FromString(s3)
if err != nil {
t.Errorf("Error parsing UUID from string: %s", err)
}
if !Equal(u, u3) {
t.Errorf("UUIDs should be equal: %s and %s", u, u3)
}
}
func TestMarshalText(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b1 := []byte("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
b2, err := u.MarshalText()
if err != nil {
t.Errorf("Error marshaling UUID: %s", err)
}
if !bytes.Equal(b1, b2) {
t.Errorf("Marshaled UUID should be %s, got %s", b1, b2)
}
}
func TestUnmarshalText(t *testing.T) {
u := UUID{0x6b, 0xa7, 0xb8, 0x10, 0x9d, 0xad, 0x11, 0xd1, 0x80, 0xb4, 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8}
b1 := []byte("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
u1 := UUID{}
err := u1.UnmarshalText(b1)
if err != nil {
t.Errorf("Error unmarshaling UUID: %s", err)
}
if !Equal(u, u1) {
t.Errorf("UUIDs should be equal: %s and %s", u, u1)
}
b2 := []byte("")
u2 := UUID{}
err = u2.UnmarshalText(b2)
if err == nil {
t.Errorf("Should return error trying to unmarshal from empty string")
}
}
func TestNewV1(t *testing.T) {
u := NewV1()
if u.Version() != 1 {
t.Errorf("UUIDv1 generated with incorrect version: %d", u.Version())
}
if u.Variant() != VariantRFC4122 {
t.Errorf("UUIDv1 generated with incorrect variant: %d", u.Variant())
}
u1 := NewV1()
u2 := NewV1()
if Equal(u1, u2) {
t.Errorf("UUIDv1 generated two equal UUIDs: %s and %s", u1, u2)
}
oldFunc := epochFunc
epochFunc = func() uint64 { return 0 }
u3 := NewV1()
u4 := NewV1()
if Equal(u3, u4) {
t.Errorf("UUIDv1 generated two equal UUIDs: %s and %s", u3, u4)
}
epochFunc = oldFunc
}
func TestNewV2(t *testing.T) {
u1 := NewV2(DomainPerson)
if u1.Version() != 2 {
t.Errorf("UUIDv2 generated with incorrect version: %d", u1.Version())
}
if u1.Variant() != VariantRFC4122 {
t.Errorf("UUIDv2 generated with incorrect variant: %d", u1.Variant())
}
u2 := NewV2(DomainGroup)
if u2.Version() != 2 {
t.Errorf("UUIDv2 generated with incorrect version: %d", u2.Version())
}
if u2.Variant() != VariantRFC4122 {
t.Errorf("UUIDv2 generated with incorrect variant: %d", u2.Variant())
}
}
func TestNewV3(t *testing.T) {
u := NewV3(NamespaceDNS, "www.example.com")
if u.Version() != 3 {
t.Errorf("UUIDv3 generated with incorrect version: %d", u.Version())
}
if u.Variant() != VariantRFC4122 {
t.Errorf("UUIDv3 generated with incorrect variant: %d", u.Variant())
}
if u.String() != "5df41881-3aed-3515-88a7-2f4a814cf09e" {
t.Errorf("UUIDv3 generated incorrectly: %s", u.String())
}
u = NewV3(NamespaceDNS, "python.org")
if u.String() != "6fa459ea-ee8a-3ca4-894e-db77e160355e" {
t.Errorf("UUIDv3 generated incorrectly: %s", u.String())
}
u1 := NewV3(NamespaceDNS, "golang.org")
u2 := NewV3(NamespaceDNS, "golang.org")
if !Equal(u1, u2) {
t.Errorf("UUIDv3 generated different UUIDs for same namespace and name: %s and %s", u1, u2)
}
u3 := NewV3(NamespaceDNS, "example.com")
if Equal(u1, u3) {
t.Errorf("UUIDv3 generated same UUIDs for different names in same namespace: %s and %s", u1, u2)
}
u4 := NewV3(NamespaceURL, "golang.org")
if Equal(u1, u4) {
t.Errorf("UUIDv3 generated same UUIDs for sane names in different namespaces: %s and %s", u1, u4)
}
}
func TestNewV4(t *testing.T) {
u := NewV4()
if u.Version() != 4 {
t.Errorf("UUIDv4 generated with incorrect version: %d", u.Version())
}
if u.Variant() != VariantRFC4122 {
t.Errorf("UUIDv4 generated with incorrect variant: %d", u.Variant())
}
}
func TestNewV5(t *testing.T) {
u := NewV5(NamespaceDNS, "www.example.com")
if u.Version() != 5 {
t.Errorf("UUIDv5 generated with incorrect version: %d", u.Version())
}
if u.Variant() != VariantRFC4122 {
t.Errorf("UUIDv5 generated with incorrect variant: %d", u.Variant())
}
u = NewV5(NamespaceDNS, "python.org")
if u.String() != "886313e1-3b8a-5372-9b90-0c9aee199e5d" {
t.Errorf("UUIDv5 generated incorrectly: %s", u.String())
}
u1 := NewV5(NamespaceDNS, "golang.org")
u2 := NewV5(NamespaceDNS, "golang.org")
if !Equal(u1, u2) {
t.Errorf("UUIDv5 generated different UUIDs for same namespace and name: %s and %s", u1, u2)
}
u3 := NewV5(NamespaceDNS, "example.com")
if Equal(u1, u3) {
t.Errorf("UUIDv5 generated same UUIDs for different names in same namespace: %s and %s", u1, u2)
}
u4 := NewV5(NamespaceURL, "golang.org")
if Equal(u1, u4) {
t.Errorf("UUIDv3 generated same UUIDs for sane names in different namespaces: %s and %s", u1, u4)
}
}