ducky/devices
2015-11-29
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/node.go
Set up DeleteDevices in Memstore. Implement the DeleteDevices method for our Memstore, removing the Devices specified by the passed IDs. Also, create a simple test that verifies that when Devices are deleted, only the Devices you intend to delete are actually deleted. Further tests should be written to verify that this extends to ListDevicesByOwner (e.g., deleted devices will not be returned when listing them), CreateDevices (e.g., will not result in an ErrDeviceAlreadyExists error), and UpdateDevice (e.g., will return an ErrDeviceNotFound error after the Device is deleted). But for now, we're confident that it works in the simplest possible case.
| 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 "net" |
| paddy@0 | 8 |
| paddy@0 | 9 var ( |
| paddy@0 | 10 interfaces []net.Interface // cached list of interfaces |
| paddy@0 | 11 ifname string // name of interface being used |
| paddy@0 | 12 nodeID []byte // hardware for version 1 UUIDs |
| paddy@0 | 13 ) |
| paddy@0 | 14 |
| paddy@0 | 15 // NodeInterface returns the name of the interface from which the NodeID was |
| paddy@0 | 16 // derived. The interface "user" is returned if the NodeID was set by |
| paddy@0 | 17 // SetNodeID. |
| paddy@0 | 18 func NodeInterface() string { |
| paddy@0 | 19 return ifname |
| paddy@0 | 20 } |
| paddy@0 | 21 |
| paddy@0 | 22 // SetNodeInterface selects the hardware address to be used for Version 1 UUIDs. |
| paddy@0 | 23 // If name is "" then the first usable interface found will be used or a random |
| paddy@0 | 24 // Node ID will be generated. If a named interface cannot be found then false |
| paddy@0 | 25 // is returned. |
| paddy@0 | 26 // |
| paddy@0 | 27 // SetNodeInterface never fails when name is "". |
| paddy@0 | 28 func SetNodeInterface(name string) bool { |
| paddy@0 | 29 if interfaces == nil { |
| paddy@0 | 30 var err error |
| paddy@0 | 31 interfaces, err = net.Interfaces() |
| paddy@0 | 32 if err != nil && name != "" { |
| paddy@0 | 33 return false |
| paddy@0 | 34 } |
| paddy@0 | 35 } |
| paddy@0 | 36 |
| paddy@0 | 37 for _, ifs := range interfaces { |
| paddy@0 | 38 if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) { |
| paddy@0 | 39 if setNodeID(ifs.HardwareAddr) { |
| paddy@0 | 40 ifname = ifs.Name |
| paddy@0 | 41 return true |
| paddy@0 | 42 } |
| paddy@0 | 43 } |
| paddy@0 | 44 } |
| paddy@0 | 45 |
| paddy@0 | 46 // We found no interfaces with a valid hardware address. If name |
| paddy@0 | 47 // does not specify a specific interface generate a random Node ID |
| paddy@0 | 48 // (section 4.1.6) |
| paddy@0 | 49 if name == "" { |
| paddy@0 | 50 if nodeID == nil { |
| paddy@0 | 51 nodeID = make([]byte, 6) |
| paddy@0 | 52 } |
| paddy@0 | 53 randomBits(nodeID) |
| paddy@0 | 54 return true |
| paddy@0 | 55 } |
| paddy@0 | 56 return false |
| paddy@0 | 57 } |
| paddy@0 | 58 |
| paddy@0 | 59 // NodeID returns a slice of a copy of the current Node ID, setting the Node ID |
| paddy@0 | 60 // if not already set. |
| paddy@0 | 61 func NodeID() []byte { |
| paddy@0 | 62 if nodeID == nil { |
| paddy@0 | 63 SetNodeInterface("") |
| paddy@0 | 64 } |
| paddy@0 | 65 nid := make([]byte, 6) |
| paddy@0 | 66 copy(nid, nodeID) |
| paddy@0 | 67 return nid |
| paddy@0 | 68 } |
| paddy@0 | 69 |
| paddy@0 | 70 // SetNodeID sets the Node ID to be used for Version 1 UUIDs. The first 6 bytes |
| paddy@0 | 71 // of id are used. If id is less than 6 bytes then false is returned and the |
| paddy@0 | 72 // Node ID is not set. |
| paddy@0 | 73 func SetNodeID(id []byte) bool { |
| paddy@0 | 74 if setNodeID(id) { |
| paddy@0 | 75 ifname = "user" |
| paddy@0 | 76 return true |
| paddy@0 | 77 } |
| paddy@0 | 78 return false |
| paddy@0 | 79 } |
| paddy@0 | 80 |
| paddy@0 | 81 func setNodeID(id []byte) bool { |
| paddy@0 | 82 if len(id) < 6 { |
| paddy@0 | 83 return false |
| paddy@0 | 84 } |
| paddy@0 | 85 if nodeID == nil { |
| paddy@0 | 86 nodeID = make([]byte, 6) |
| paddy@0 | 87 } |
| paddy@0 | 88 copy(nodeID, id) |
| paddy@0 | 89 return true |
| paddy@0 | 90 } |
| paddy@0 | 91 |
| paddy@0 | 92 // NodeID returns the 6 byte node id encoded in uuid. It returns nil if uuid is |
| paddy@0 | 93 // not valid. The NodeID is only well defined for version 1 and 2 UUIDs. |
| paddy@0 | 94 func (uuid UUID) NodeID() []byte { |
| paddy@0 | 95 if len(uuid) != 16 { |
| paddy@0 | 96 return nil |
| paddy@0 | 97 } |
| paddy@0 | 98 node := make([]byte, 6) |
| paddy@0 | 99 copy(node, uuid[10:]) |
| paddy@0 | 100 return node |
| paddy@0 | 101 } |