mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-09-20 15:39:52 +00:00
57 lines
2.2 KiB
Go
57 lines
2.2 KiB
Go
|
// Copyright 2023 Google Inc. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package uuid
|
||
|
|
|
||
|
|
import "encoding/binary"
|
||
|
|
|
||
|
|
// UUID version 6 is a field-compatible version of UUIDv1, reordered for improved DB locality.
|
||
|
|
// It is expected that UUIDv6 will primarily be used in contexts where there are existing v1 UUIDs.
|
||
|
|
// Systems that do not involve legacy UUIDv1 SHOULD consider using UUIDv7 instead.
|
||
|
|
//
|
||
|
|
// see https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-03#uuidv6
|
||
|
|
//
|
||
|
|
// NewV6 returns a Version 6 UUID based on the current NodeID and clock
|
||
|
|
// sequence, and the current time. If the NodeID has not been set by SetNodeID
|
||
|
|
// or SetNodeInterface then it will be set automatically. If the NodeID cannot
|
||
|
|
// be set NewV6 set NodeID is random bits automatically . If clock sequence has not been set by
|
||
|
|
// SetClockSequence then it will be set automatically. If GetTime fails to
|
||
|
|
// return the current NewV6 returns Nil and an error.
|
||
|
|
func NewV6() (UUID, error) {
|
||
|
|
var uuid UUID
|
||
|
|
now, seq, err := GetTime()
|
||
|
|
if err != nil {
|
||
|
|
return uuid, err
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
0 1 2 3
|
||
|
|
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| time_high |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| time_mid | time_low_and_version |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
|clk_seq_hi_res | clk_seq_low | node (0-1) |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| node (2-5) |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
*/
|
||
|
|
|
||
|
|
binary.BigEndian.PutUint64(uuid[0:], uint64(now))
|
||
|
|
binary.BigEndian.PutUint16(uuid[8:], seq)
|
||
|
|
|
||
|
|
uuid[6] = 0x60 | (uuid[6] & 0x0F)
|
||
|
|
uuid[8] = 0x80 | (uuid[8] & 0x3F)
|
||
|
|
|
||
|
|
nodeMu.Lock()
|
||
|
|
if nodeID == zeroID {
|
||
|
|
setNodeInterface("")
|
||
|
|
}
|
||
|
|
copy(uuid[10:], nodeID[:])
|
||
|
|
nodeMu.Unlock()
|
||
|
|
|
||
|
|
return uuid, nil
|
||
|
|
}
|