ducky/devices
2015-11-12
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/version1.go
Initial attempt. Create the basic types (Device, DeviceType, DeviceChange) that we'll be using in the service. Also, create our Storer interface, and the helper methods to store, retrieve, and update information in the datastore. Also, we're using Godep, so check in our Godeps folder and the vendor folder. Note that this only works on Go 1.5 and later, with the GO15VENDOREXPERIMENT environment variable set to 1.
1 // Copyright 2011 Google Inc. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 package uuid
7 import (
8 "encoding/binary"
9 )
11 // NewUUID returns a Version 1 UUID based on the current NodeID and clock
12 // sequence, and the current time. If the NodeID has not been set by SetNodeID
13 // or SetNodeInterface then it will be set automatically. If the NodeID cannot
14 // be set NewUUID returns nil. If clock sequence has not been set by
15 // SetClockSequence then it will be set automatically. If GetTime fails to
16 // return the current NewUUID returns nil.
17 func NewUUID() UUID {
18 if nodeID == nil {
19 SetNodeInterface("")
20 }
22 now, seq, err := GetTime()
23 if err != nil {
24 return nil
25 }
27 uuid := make([]byte, 16)
29 time_low := uint32(now & 0xffffffff)
30 time_mid := uint16((now >> 32) & 0xffff)
31 time_hi := uint16((now >> 48) & 0x0fff)
32 time_hi |= 0x1000 // Version 1
34 binary.BigEndian.PutUint32(uuid[0:], time_low)
35 binary.BigEndian.PutUint16(uuid[4:], time_mid)
36 binary.BigEndian.PutUint16(uuid[6:], time_hi)
37 binary.BigEndian.PutUint16(uuid[8:], seq)
38 copy(uuid[10:], nodeID)
40 return uuid
41 }