/
proxy.go
197 lines (159 loc) · 3.95 KB
/
proxy.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
package sbSwitchProxy
import (
"context"
"fmt"
"sync"
"time"
"github.com/asim/go-micro/v3/broker"
"github.com/asim/go-micro/v3/client"
sbSwitch "github.com/dh1tw/remoteSwitch/sb_switch"
sw "github.com/dh1tw/remoteSwitch/switch"
"google.golang.org/protobuf/proto"
)
type SbSwitchProxy struct {
sync.RWMutex
cli client.Client
scli sbSwitch.SbSwitchService
eventHandler func(sw.Switcher, sw.Device)
device sw.Device
doneCh chan struct{}
doneOnce sync.Once
subscriber broker.Subscriber
serviceName string
}
func New(opts ...func(*SbSwitchProxy)) (*SbSwitchProxy, error) {
s := &SbSwitchProxy{
device: sw.Device{
Name: "SwitchProxy",
Index: 0,
Ports: []sw.Port{},
},
serviceName: "shackbus.switch.mySwitch",
}
for _, opt := range opts {
opt(s)
}
s.scli = sbSwitch.NewSbSwitchService(s.serviceName, s.cli)
if err := s.getInfo(); err != nil {
return nil, err
}
br := s.cli.Options().Broker
if err := br.Connect(); err != nil {
return nil, err
}
sub, err := br.Subscribe(s.serviceName+".state", s.updateHandler)
if err != nil {
return nil, err
}
s.subscriber = sub
return s, nil
}
// the doneCh must be closed through this function to avoid
// multiple times closing this channel. Closing the doneCh signals the
// application that this object can be disposed
func (s *SbSwitchProxy) closeDone() {
s.doneOnce.Do(func() { close(s.doneCh) })
}
func (s *SbSwitchProxy) updateHandler(p broker.Event) error {
sbDevice := sbSwitch.Device{}
if err := proto.Unmarshal(p.Message().Body, &sbDevice); err != nil {
return err
}
s.Lock()
defer s.Unlock()
s.device.Ports = []sw.Port{}
for _, sbPort := range sbDevice.GetPorts() {
port := sw.Port{
Name: sbPort.GetName(),
Index: int(sbPort.GetIndex()),
Terminals: []sw.Terminal{},
}
for _, sbTerminal := range sbPort.GetTerminals() {
t := sw.Terminal{
Name: sbTerminal.GetName(),
Index: int(sbTerminal.GetIndex()),
State: sbTerminal.GetState(),
}
port.Terminals = append(port.Terminals, t)
}
s.device.Ports = append(s.device.Ports, port)
}
if s.eventHandler != nil {
go s.eventHandler(s, s.serialize())
}
return nil
}
func (s *SbSwitchProxy) getInfo() error {
device, err := s.scli.GetDevice(context.Background(), &sbSwitch.None{})
if err != nil {
return err
}
s.device.Name = device.GetName()
s.device.Index = int(device.GetIndex())
ports := device.GetPorts()
for _, port := range ports {
p := sw.Port{
Name: port.GetName(),
Index: int(port.GetIndex()),
}
terminals := port.GetTerminals()
for _, terminal := range terminals {
t := sw.Terminal{
Name: terminal.GetName(),
Index: int(terminal.GetIndex()),
State: terminal.GetState(),
}
p.Terminals = append(p.Terminals, t)
}
s.device.Ports = append(s.device.Ports, p)
}
return nil
}
func (s *SbSwitchProxy) Name() string {
s.RLock()
defer s.RUnlock()
return s.device.Name
}
func (s *SbSwitchProxy) GetPort(portName string) (sw.Port, error) {
s.RLock()
defer s.RUnlock()
for _, port := range s.device.Ports {
if port.Name == portName {
return port, nil
}
}
return sw.Port{}, fmt.Errorf("unknown portname %s", portName)
}
func (s *SbSwitchProxy) SetPort(port sw.Port) error {
s.Lock()
defer s.Unlock()
sbPortReq := &sbSwitch.PortRequest{
Name: port.Name,
Terminals: []*sbSwitch.Terminal{},
}
for _, t := range port.Terminals {
sbTerminal := &sbSwitch.Terminal{
Name: t.Name,
State: t.State,
}
sbPortReq.Terminals = append(sbPortReq.Terminals, sbTerminal)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
_, err := s.scli.SetPort(ctx, sbPortReq)
return err
}
func (s *SbSwitchProxy) Serialize() sw.Device {
s.RLock()
defer s.RUnlock()
return s.serialize()
}
func (s *SbSwitchProxy) serialize() sw.Device {
return s.device
}
func (s *SbSwitchProxy) Close() {
if s.subscriber != nil {
s.subscriber.Unsubscribe()
}
s.closeDone()
}