| // 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 ( |
| "bytes" |
| "crypto/rand" |
| "io" |
| ) |
| |
| // UUID represents a UUID. |
| type UUID [16]byte |
| |
| var rander = rand.Reader |
| |
| // New generates a new uuid. |
| func New() (UUID, error) { |
| var uuid [16]byte |
| |
| _, err := io.ReadFull(rander, 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 bytes.Equal([]byte(a[:]), []byte(b[:])) |
| } |