mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-25 12:12:05 -08:00
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
|
// Copyright 2011 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"
|
||
|
|
)
|
||
|
|
|
||
|
|
// NewUUID returns a Version 1 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 NewUUID returns nil. If clock sequence has not been set by
|
||
|
|
// SetClockSequence then it will be set automatically. If GetTime fails to
|
||
|
|
// return the current NewUUID returns nil.
|
||
|
|
func NewUUID() UUID {
|
||
|
|
if nodeID == nil {
|
||
|
|
SetNodeInterface("")
|
||
|
|
}
|
||
|
|
|
||
|
|
now, seq, err := GetTime()
|
||
|
|
if err != nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
uuid := make([]byte, 16)
|
||
|
|
|
||
|
|
time_low := uint32(now & 0xffffffff)
|
||
|
|
time_mid := uint16((now >> 32) & 0xffff)
|
||
|
|
time_hi := uint16((now >> 48) & 0x0fff)
|
||
|
|
time_hi |= 0x1000 // Version 1
|
||
|
|
|
||
|
|
binary.BigEndian.PutUint32(uuid[0:], time_low)
|
||
|
|
binary.BigEndian.PutUint16(uuid[4:], time_mid)
|
||
|
|
binary.BigEndian.PutUint16(uuid[6:], time_hi)
|
||
|
|
binary.BigEndian.PutUint16(uuid[8:], seq)
|
||
|
|
copy(uuid[10:], nodeID)
|
||
|
|
|
||
|
|
return uuid
|
||
|
|
}
|