1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// Copyright (C) MongoDB, Inc. 2017-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package uuid // import "go.mongodb.org/mongo-driver/x/mongo/driver/uuid"
import (
"io"
"math/rand"
"time"
"go.mongodb.org/mongo-driver/internal/randutil"
)
// UUID represents a UUID.
type UUID [16]byte
// random is a package-global pseudo-random number generator.
var random = randutil.NewLockedRand(rand.NewSource(time.Now().UnixNano()))
// New returns a random UUIDv4. It uses a "math/rand" pseudo-random number generator seeded with the
// package initialization time.
//
// New should not be used to generate cryptographically-secure random UUIDs.
func New() (UUID, error) {
var uuid [16]byte
_, err := io.ReadFull(random, uuid[:])
if err != nil {
return [16]byte{}, err
}
uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
return uuid, nil
}
// Equal returns true if two UUIDs are equal.
func Equal(a, b UUID) bool {
return a == b
}
|
