-
Notifications
You must be signed in to change notification settings - Fork 0
/
listener.go
290 lines (261 loc) · 7.93 KB
/
listener.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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
package proxy
import (
"context"
"io"
"net"
"sync"
"time"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
"github.com/uber/jaeger-client-go"
"github.com/hsmade/comfoconnectbridge/pkg/comfoconnect"
"github.com/hsmade/comfoconnectbridge/proto"
)
var (
clientConnections = prometheus.NewGauge(
prometheus.GaugeOpts{
Name: "comfoconnect_proxy_listener_connections",
Help: "Number of connections to the listener.",
},
)
messageSentCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "comfoconnect_proxy_listener_message_sent_total",
Help: "Number of messages sent by the listener.",
},
[]string{"message_type"},
)
messageReceiverCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "comfoconnect_proxy_listener_message_receiver_total",
Help: "Number of messages received by the listener go func.",
},
[]string{"message_type"},
)
messageReceivedCount = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "comfoconnect_proxy_listener_message_received_total",
Help: "Number of messages received by the listener main loop.",
},
[]string{"message_type"},
)
)
type Listener struct {
listener *net.TCPListener
apps map[string]*App
toGateway chan comfoconnect.Message
}
func NewListener(toGateway chan comfoconnect.Message) *Listener {
log := logrus.WithFields(logrus.Fields{
"module": "proxy",
"method": "NewListener",
})
addr, err := net.ResolveTCPAddr("tcp4", ":56747")
if err != nil {
log.Fatalf("failed to resolve address: %v", err)
}
log.Infof("Listening on %s", addr.String())
listener, err := net.ListenTCP("tcp4", addr)
if err != nil {
log.Fatalf("failed to create listener: %v", err)
}
prometheus.MustRegister(clientConnections)
prometheus.MustRegister(messageSentCount)
prometheus.MustRegister(messageReceiverCount)
prometheus.MustRegister(messageReceivedCount)
return &Listener{
listener: listener,
toGateway: toGateway,
apps: make(map[string]*App),
}
}
func (l *Listener) Run(ctx context.Context, wg *sync.WaitGroup) {
log := logrus.WithFields(logrus.Fields{
"module": "proxy",
"object": "listener",
"method": "Run",
})
log.Debug("starting")
var handlers sync.WaitGroup
for {
select {
case <-ctx.Done():
log.Info("shutting down")
_ = l.listener.Close()
handlers.Wait()
wg.Done()
return
default:
err := l.listener.SetDeadline(time.Now().Add(time.Second * 1))
if err != nil {
log.Errorf("failed to set read deadline: %v", err)
continue
}
conn, err := l.listener.Accept()
if err != nil {
if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
continue
}
log.Errorf("failed to accept connection: %v", err)
continue
}
clientConnections.Inc()
log.Infof("got a new connection from: %s", conn.RemoteAddr().String())
handlers.Add(1)
go func() {
for {
app := App{conn: conn}
l.apps[conn.RemoteAddr().String()] = &app
log.Debug("starting handler")
err := app.HandleConnection(ctx, wg, l.toGateway)
if err != nil {
log.Errorf("failed to handle connection: %v", err)
break
}
}
handlers.Done()
clientConnections.Dec()
}()
}
}
}
type App struct {
uuid []byte
conn net.Conn
}
func (a *App) HandleConnection(ctx context.Context, wg *sync.WaitGroup, gateway chan comfoconnect.Message) error {
log := logrus.WithFields(logrus.Fields{
"module": "proxy",
"object": "listener",
"method": "HandleConnection",
})
log.Infof("handling connection from: %s", a.conn.RemoteAddr().String())
messageChannel := make(chan comfoconnect.Message, 500)
//prometheus.MustRegister(prometheus.NewGaugeFunc(prometheus.GaugeOpts{
// Name: "comfoconnect_proxy_listener_messageChannel_queue",
// Help: "The current number of items on messageChannel queue.",
//}, func() float64 {
// return float64(len(messageChannel))
//}))
go func (ctx context.Context, wg *sync.WaitGroup, messageChannel chan comfoconnect.Message) {
log.Debug("starting socket reader")
for {
select {
case <- ctx.Done():
log.Debug("closing connection reader go-func")
wg.Done()
return
default:
err := a.conn.SetReadDeadline(time.Now().Add(time.Millisecond * 300))
if err != nil {
log.Warnf("failed to set readDeadline: %v", err)
}
message, err := comfoconnect.GetMessageFromSocket(a.conn)
if err != nil {
if errors.Cause(err) == io.EOF {
return
}
// FIXME: log error, ignore timeout
continue
}
messageReceiverCount.WithLabelValues(message.Operation.Type.String()).Inc()
messageChannel <- message
}
}
}(ctx, wg, messageChannel)
log.Debug("starting main loop")
for {
select {
case <- ctx.Done():
log.Debug("closing main loop")
wg.Done()
return nil
case message := <- messageChannel:
messageReceivedCount.WithLabelValues(message.Operation.Type.String()).Inc()
span := opentracing.GlobalTracer().StartSpan("proxy.App.HandleConnection.ReceivedMessage", opentracing.ChildOf(message.Span.Context()))
comfoconnect.SpanSetMessage(span, message)
log.WithField("span",span.Context().(jaeger.SpanContext).String()).Debugf("got a message from app(%s): %v", a.conn.RemoteAddr(), message)
a.uuid = message.Src
a.handleMessage(message, gateway)
span.Finish()
}
}
}
func (a *App) handleMessage(message comfoconnect.Message, gateway chan comfoconnect.Message) {
span := opentracing.GlobalTracer().StartSpan("proxy.App.HandleConnection.handleMessage", opentracing.ChildOf(message.Span.Context()))
comfoconnect.SpanSetMessage(span, message)
log := logrus.WithFields(logrus.Fields{
"module": "proxy",
"object": "listener",
"method": "handleMessage",
"span": span.Context().(jaeger.SpanContext).String(),
})
switch message.Operation.Type.String() {
case "RegisterAppRequestType":
log.Debug("responding to RegisterAppRequestType")
a.uuid = message.Src
_, err := a.conn.Write(message.CreateResponse(span, proto.GatewayOperation_OK))
if err != nil {
span.SetTag("err", err)
log.Warnf("failed to write response for RegisterAppRequestType: %v", err)
}
case "StartSessionRequestType":
log.Debug("responding to StartSessionRequestType")
_, err := a.conn.Write(message.CreateResponse(span, proto.GatewayOperation_OK))
if err != nil {
span.SetTag("err", err)
log.Warnf("failed to write response for StartSessionRequestType: %v", err)
}
i := uint32(1)
mode := proto.CnNodeNotification_NODE_NORMAL
notification := proto.CnNodeNotification{
NodeId: &i,
ProductId: &i,
ZoneId: &i,
Mode: &mode,
}
_, err = a.conn.Write(message.CreateCustomResponse(span, proto.GatewayOperation_CnNodeNotificationType, ¬ification))
if err != nil {
span.SetTag("err", err)
log.Warnf("failed to write CnNodeNotification-1: %v", err)
}
i48 := uint32(48)
i5 := uint32(5)
i255 := uint32(255)
mode = proto.CnNodeNotification_NODE_NORMAL
notification = proto.CnNodeNotification{
NodeId: &i48,
ProductId: &i5,
ZoneId: &i255,
Mode: &mode,
}
_, err = a.conn.Write(message.CreateCustomResponse(span, proto.GatewayOperation_CnNodeNotificationType, ¬ification))
if err != nil {
span.SetTag("err", err)
log.Warnf("failed to write CnNodeNotification-2: %v", err)
}
default:
log.Debugf("forwarding message to gateway: %v", message)
message.Span = span
gateway <- message
}
span.Finish()
}
func (a *App) Write(message comfoconnect.Message) error {
log := logrus.WithFields(logrus.Fields{
"module": "proxy",
"object": "App",
"method": "Write",
})
messageSentCount.WithLabelValues(message.Operation.Type.String()).Inc()
span := opentracing.GlobalTracer().StartSpan("proxy.App.Write")
comfoconnect.SpanSetMessage(span, message)
defer span.Finish()
e := message.Encode()
length, err := a.conn.Write(e)
log.Infof("Wrote %d bytes to app. err:%v bytes:%x message:%v", length, err, e, message)
span.SetTag("length", length)
return err
}