ducky/devices
2015-11-27
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/version1.go
Implement and test updating devices, and reuse contexts. Update all our tests to use the same context.Context instance within each test case, so static analysis about how we're passing contexts around dosn't get tripped up. Also, write a test that will check to make sure that our Storer implementations all actually update the Device correctly. We create every possible permutation of a DeviceChange, just to make sure they all work.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 import ( |
| paddy@0 | 8 "encoding/binary" |
| paddy@0 | 9 ) |
| paddy@0 | 10 |
| paddy@0 | 11 // NewUUID returns a Version 1 UUID based on the current NodeID and clock |
| paddy@0 | 12 // sequence, and the current time. If the NodeID has not been set by SetNodeID |
| paddy@0 | 13 // or SetNodeInterface then it will be set automatically. If the NodeID cannot |
| paddy@0 | 14 // be set NewUUID returns nil. If clock sequence has not been set by |
| paddy@0 | 15 // SetClockSequence then it will be set automatically. If GetTime fails to |
| paddy@0 | 16 // return the current NewUUID returns nil. |
| paddy@0 | 17 func NewUUID() UUID { |
| paddy@0 | 18 if nodeID == nil { |
| paddy@0 | 19 SetNodeInterface("") |
| paddy@0 | 20 } |
| paddy@0 | 21 |
| paddy@0 | 22 now, seq, err := GetTime() |
| paddy@0 | 23 if err != nil { |
| paddy@0 | 24 return nil |
| paddy@0 | 25 } |
| paddy@0 | 26 |
| paddy@0 | 27 uuid := make([]byte, 16) |
| paddy@0 | 28 |
| paddy@0 | 29 time_low := uint32(now & 0xffffffff) |
| paddy@0 | 30 time_mid := uint16((now >> 32) & 0xffff) |
| paddy@0 | 31 time_hi := uint16((now >> 48) & 0x0fff) |
| paddy@0 | 32 time_hi |= 0x1000 // Version 1 |
| paddy@0 | 33 |
| paddy@0 | 34 binary.BigEndian.PutUint32(uuid[0:], time_low) |
| paddy@0 | 35 binary.BigEndian.PutUint16(uuid[4:], time_mid) |
| paddy@0 | 36 binary.BigEndian.PutUint16(uuid[6:], time_hi) |
| paddy@0 | 37 binary.BigEndian.PutUint16(uuid[8:], seq) |
| paddy@0 | 38 copy(uuid[10:], nodeID) |
| paddy@0 | 39 |
| paddy@0 | 40 return uuid |
| paddy@0 | 41 } |