ducky/devices

Paddy 2015-12-22 Parent:1ae5bae472c1

18:b2fdf827758e Go to Latest

ducky/devices/memstore.go

Add endpoint for retrieving devices. Add an endpoint for retrieving devices, either as a list or by ID. Stub endpoints for updating and deleting devices., along with TODOs marking them as things to still be completed. (Right now, accessing those endpoints is an insta-panic.) Simplify our handleCreateDevices by returning StatusUnauthorized if AuthUser fails, so we can reserve StatusForbidden for when auth succeeds but access is still denied. Also, delay the instantiation and allocation of a Response variable until we're actually going to use it. Create a handleGetDevices handler that authenticates the user, and if no ID is set, returns a list of all their Devices. If one or more IDs are set, only those Devices are returned. If ScopeViewPushToken is one of the scopes associated with the request, the push tokens for each Device will be included in the response. Otherwise, they will be omitted.

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1 package devices
2
3 import (
4 "sync"
5
6 "code.secondbit.org/uuid.hg"
7 "golang.org/x/net/context"
8 )
9
10 // Memstore is an in-memory implementation of Storer, and should
11 // only be used for testing or for temporary local servers.
12 type Memstore struct {
13 devices map[string]Device
14 lock sync.RWMutex
15 }
16
17 // NewMemstore returns a Memstore that is ready to be used as a
18 // Storer implementation.
19 func NewMemstore() *Memstore {
20 return &Memstore{
21 devices: map[string]Device{},
22 }
23 }
24
25 // GetDevices returns any Devices in the Memstore that match the
26 // passed IDs. If an ID cannot be matched to a Device in the
27 // Memstore, it is ignored. The result is a map, with the values
28 // being the Devices that could be found, and the keys being the
29 // result of the String() method for each Device's ID.
30 //
31 // An empty map is a possible response, if none of the IDs could
32 // be found.
33 func (m *Memstore) GetDevices(ids []uuid.ID, c context.Context) (map[string]Device, error) {
34 m.lock.RLock()
35 defer m.lock.RUnlock()
36
37 results := map[string]Device{}
38
39 for _, id := range ids {
40 device, ok := m.devices[id.String()]
41 if !ok {
42 continue
43 }
44 results[id.String()] = device
45 }
46 return results, nil
47 }
48
49 // UpdateDevice applies the passed DeviceChange to the Device
50 // in the Memstore specified by the DeviceChange's DeviceID
51 // property. If no Device in the Memstore matches the DeviceChange's
52 // DeviceID property, then an ErrDeviceNotFound error will be
53 // returned.
54 func (m *Memstore) UpdateDevice(change DeviceChange, c context.Context) error {
55 m.lock.Lock()
56 defer m.lock.Unlock()
57
58 device, ok := m.devices[change.DeviceID.String()]
59 if !ok {
60 return ErrDeviceNotFound
61 }
62
63 device = ApplyChange(device, change)
64 m.devices[change.DeviceID.String()] = device
65
66 return nil
67 }
68
69 // DeleteDevices will remove any Devices from the Memstore that match
70 // the IDs passed in. If an ID can't be matched to a Device in the
71 // Memstore, then it is ignored.
72 func (m *Memstore) DeleteDevices(ids []uuid.ID, c context.Context) error {
73 m.lock.Lock()
74 defer m.lock.Unlock()
75
76 for _, id := range ids {
77 delete(m.devices, id.String())
78 }
79
80 return nil
81 }
82
83 // CreateDevices stores the passed devices in the Memstore as a single
84 // transaction. If a Device's ID already exists in the Memstore, an
85 // ErrDeviceAlreadyExists error with that Device's ID is returned, and
86 // none of the passed Devices are stored.
87 func (m *Memstore) CreateDevices(devices []Device, c context.Context) error {
88 m.lock.Lock()
89 defer m.lock.Unlock()
90
91 for _, device := range devices {
92 if _, ok := m.devices[device.ID.String()]; ok {
93 return ErrDeviceAlreadyExists(device.ID)
94 }
95 }
96
97 for _, device := range devices {
98 m.devices[device.ID.String()] = device
99 }
100 return nil
101 }
102
103 // ListDevicesByOwner returns all the Devices in the Memstore that have an
104 // Owner property that matches the passed ID. If no Devices have an Owner
105 // property matching the passed ID, an empty slice is returned.
106 //
107 // ListDevicesByOwner does not guarantee any sort order for the Devices.
108 func (m *Memstore) ListDevicesByOwner(user uuid.ID, c context.Context) ([]Device, error) {
109 var devices []Device
110 for _, device := range m.devices {
111 if !device.Owner.Equal(user) {
112 continue
113 }
114 devices = append(devices, device)
115 }
116 return devices, nil
117 }