ducky/devices

Paddy 2015-11-12 Child:a700ede02f91

0:b6494e1a499e Go to Latest

ducky/devices/vendor/code.secondbit.org/uuid.hg/uuid.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.

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paddy@0 1 package uuid
paddy@0 2
paddy@0 3 import (
paddy@0 4 "database/sql/driver"
paddy@0 5 "encoding/json"
paddy@0 6 "encoding/xml"
paddy@0 7 "errors"
paddy@0 8
paddy@0 9 "code.google.com/p/go-uuid/uuid"
paddy@0 10 )
paddy@0 11
paddy@0 12 var InvalidIDError = errors.New("Invalid ID format.")
paddy@0 13
paddy@0 14 type ID uuid.UUID
paddy@0 15
paddy@0 16 func NewID() ID {
paddy@0 17 return ID(uuid.NewRandom())
paddy@0 18 }
paddy@0 19
paddy@0 20 func (id ID) String() string {
paddy@0 21 return uuid.UUID(id).String()
paddy@0 22 }
paddy@0 23
paddy@0 24 func (id ID) IsZero() bool {
paddy@0 25 if id == nil {
paddy@0 26 return true
paddy@0 27 }
paddy@0 28 if len(id) == 0 {
paddy@0 29 return true
paddy@0 30 }
paddy@0 31 return false
paddy@0 32 }
paddy@0 33
paddy@0 34 func (id ID) Copy() ID {
paddy@0 35 resp, _ := Parse(id.String())
paddy@0 36 // ignore the error because they asked for a copy of the ID, they
paddy@0 37 // never asked if it was valid or not.
paddy@0 38 // This is, overall, not the most efficient way to do this (we're
paddy@0 39 // essentially converting to a string and then back again) but the
paddy@0 40 // computational complexity involved is pretty minor, and it allows
paddy@0 41 // us to respect the boundaries between the packages, using only the
paddy@0 42 // exported interfaces to perform a copy. And that seems pretty
paddy@0 43 // valuable.
paddy@0 44 return resp
paddy@0 45 }
paddy@0 46
paddy@0 47 func (id ID) MarshalJSON() ([]byte, error) {
paddy@0 48 return json.Marshal(id.String())
paddy@0 49 }
paddy@0 50
paddy@0 51 func (id ID) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
paddy@0 52 return e.EncodeElement(id.String(), start)
paddy@0 53 }
paddy@0 54
paddy@0 55 func (id ID) Value() (driver.Value, error) {
paddy@0 56 return id.String(), nil
paddy@0 57 }
paddy@0 58
paddy@0 59 func (id *ID) Scan(src interface{}) error {
paddy@0 60 if src == nil {
paddy@0 61 id = nil
paddy@0 62 return nil
paddy@0 63 }
paddy@0 64 switch src.(type) {
paddy@0 65 case []byte:
paddy@0 66 if len(src.([]byte)) == 0 {
paddy@0 67 *id = (*id)[:0]
paddy@0 68 return nil
paddy@0 69 }
paddy@0 70 newID, err := Parse(string(src.([]byte)))
paddy@0 71 if err != nil {
paddy@0 72 return err
paddy@0 73 }
paddy@0 74 *id = append((*id)[:0], newID...)
paddy@0 75 return nil
paddy@0 76 case string:
paddy@0 77 if len(src.(string)) == 0 {
paddy@0 78 *id = (*id)[:0]
paddy@0 79 return nil
paddy@0 80 }
paddy@0 81 newID, err := Parse(src.(string))
paddy@0 82 if err != nil {
paddy@0 83 return err
paddy@0 84 }
paddy@0 85 *id = append((*id)[:0], newID...)
paddy@0 86 return nil
paddy@0 87 default:
paddy@0 88 return InvalidIDError
paddy@0 89 }
paddy@0 90 return nil
paddy@0 91 }
paddy@0 92
paddy@0 93 func (id *ID) UnmarshalJSON(in []byte) error {
paddy@0 94 var tmp string
paddy@0 95 err := json.Unmarshal(in, &tmp)
paddy@0 96 if err != nil {
paddy@0 97 return err
paddy@0 98 }
paddy@0 99 newID, err := Parse(tmp)
paddy@0 100 if err != nil {
paddy@0 101 return err
paddy@0 102 }
paddy@0 103 *id = append((*id)[:0], newID...)
paddy@0 104 return nil
paddy@0 105 }
paddy@0 106
paddy@0 107 func (id *ID) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
paddy@0 108 var tmp string
paddy@0 109 err := d.DecodeElement(&tmp, &start)
paddy@0 110 if err != nil {
paddy@0 111 return err
paddy@0 112 }
paddy@0 113 newID, err := Parse(tmp)
paddy@0 114 if err != nil {
paddy@0 115 return err
paddy@0 116 }
paddy@0 117 *id = append((*id)[:0], newID...)
paddy@0 118 return nil
paddy@0 119 }
paddy@0 120
paddy@0 121 func Parse(in string) (ID, error) {
paddy@0 122 id := ID(uuid.Parse(in))
paddy@0 123 if id == nil {
paddy@0 124 return id, InvalidIDError
paddy@0 125 }
paddy@0 126 return id, nil
paddy@0 127 }
paddy@0 128
paddy@0 129 func (id ID) Equal(other ID) bool {
paddy@0 130 return uuid.Equal(uuid.UUID(id), uuid.UUID(other))
paddy@0 131 }