-
Notifications
You must be signed in to change notification settings - Fork 5
/
stream.go
323 lines (294 loc) · 6.8 KB
/
stream.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
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
package socket
import (
"encoding/binary"
"io"
"net"
"sync"
"time"
"github.com/zenhotels/astranet/addr"
"github.com/zenhotels/astranet/protocol"
"github.com/zenhotels/astranet/skykiss"
"github.com/zenhotels/astranet/transport"
)
const (
TCP_CLOSE_WND = 10 * time.Second
)
type stream struct {
network string
local uint64
remote uint64
lport uint32
rport uint32
canSend uint32
status ConnState
state sync.Cond
sLock sync.RWMutex
rBuf []skykiss.BytesPackage
wBuf uint32
wndSize uint32
connHndl transport.Handler
mpx transport.Transport
rDeadLine time.Time
wDeadLine time.Time
onCloseCb func()
}
func (self *stream) Join(op ConnState) (state ConnState) {
var match = func(op ConnState) bool {
return (self.status & op) == op
}
self.sLock.Lock()
state_loop:
for {
switch {
case !self.rDeadLine.IsZero() && self.rDeadLine.Before(time.Now()):
self.status = self.status | stForceClosed
break state_loop
case match(op):
break state_loop
case match(stClosed):
break state_loop
default:
self.state.Wait()
}
}
state = self.status
self.sLock.Unlock()
return
}
func (self *stream) recv(op protocol.Op, _ transport.Transport) {
self.sLock.Lock()
switch op.Cmd {
case opSyn:
self.status = self.status | stSyn
self.remote = op.Local
self.rport = op.LPort
self.state.Broadcast()
self.sLock.Unlock()
self.subscribe(opSynAck, opData, opErr, opFin1, opFin2, opData, opWndSize, opRewind)
self.mpx.Queue(self.Op(opAck, nil))
return
case opAck:
self.status = self.status | stAck
self.state.Broadcast()
self.sLock.Unlock()
self.mpx.Queue(self.Op(opSynAck, nil))
return
case opSynAck:
self.status = self.status | stSynAck
case opFin1:
self.status = self.status | stFin1
case opErr:
self.status = self.status | stErr
case opWndSize:
self.wndSize = binary.BigEndian.Uint32(op.Data.Bytes)
case opRewind:
self.wBuf -= binary.BigEndian.Uint32(op.Data.Bytes)
case opData:
if len(op.Data.Bytes) > 0 {
var buf = skykiss.BytesNew(len(op.Data.Bytes))
copy(buf.Bytes, op.Data.Bytes)
self.rBuf = append(self.rBuf, buf)
}
case opFin2:
var ioDeadline = time.Now().Add(TCP_CLOSE_WND)
go func() {
self.sLock.Lock()
for time.Now().Before(ioDeadline) && len(self.rBuf) > 0 {
skykiss.WaitTimeout(&self.state, ioDeadline.Sub(time.Now()))
}
self.status = self.status | stFin2
self.state.Broadcast()
self.sLock.Unlock()
}()
default:
}
self.state.Broadcast()
self.sLock.Unlock()
}
func (self *stream) Write(b []byte) (n int, err error) {
self.Join(stAck)
self.sLock.Lock()
if self.status&stFin1 > 0 {
self.sLock.Unlock()
return 0, io.EOF
}
stateLoop:
for {
switch {
case !self.wDeadLine.IsZero() && self.wDeadLine.Before(time.Now()):
err = ErrTimeout
break stateLoop
case len(b) == 0:
break stateLoop
case self.wBuf < self.wndSize:
var bLeft = int(self.wndSize - self.wBuf)
if bLeft > len(b) {
bLeft = len(b)
}
var data = b[0:bLeft]
self.wBuf += uint32(len(data))
n += len(data)
b = b[len(data):]
self.sLock.Unlock()
var op = self.Op(opData, data)
self.mpx.Send(op)
self.sLock.Lock()
case self.status&stFin1 > 0:
err = io.EOF
break stateLoop
default:
self.state.Wait()
}
}
self.sLock.Unlock()
return
}
func (self *stream) Read(b []byte) (n int, err error) {
self.sLock.Lock()
if self.status&stFin2 > 0 {
self.sLock.Unlock()
return 0, io.EOF
}
var buf skykiss.BytesPackage
stateLoop:
for {
switch {
case !self.rDeadLine.IsZero() && self.rDeadLine.Before(time.Now()):
err = ErrTimeout
break stateLoop
case len(b) == 0:
break stateLoop
case len(self.rBuf) > 0:
buf = self.rBuf[0]
var rBufN = copy(b, buf.Bytes)
n += rBufN
b = b[rBufN:]
if rBufN == len(buf.Bytes) {
var nl = copy(self.rBuf[0:], self.rBuf[1:])
self.rBuf = self.rBuf[0:nl]
skykiss.BytesRelease(buf)
} else {
self.rBuf[0].Bytes = self.rBuf[0].Bytes[rBufN:]
}
continue
case len(self.rBuf) == 0 && n > 0:
break stateLoop
case self.status&stFin2 > 0:
err = io.EOF
break stateLoop
default:
self.state.Wait()
}
}
self.state.Broadcast()
self.sLock.Unlock()
if n > 0 {
var rwnd [4]byte
binary.BigEndian.PutUint32(rwnd[:], uint32(n))
self.mpx.Queue(self.Op(opRewind, rwnd[:]))
}
return
}
func (self *stream) Close() error {
time.AfterFunc(time.Second*10, func() {
self.recv(self.Op(opForceClosed, nil), nil)
self.state.Broadcast()
self.connHndl.Close()
})
self.recv(self.Op(opFin1, nil), nil)
self.mpx.Queue(self.Op(opFin2, nil))
self.state.Broadcast()
if self.onCloseCb != nil {
self.onCloseCb()
}
return nil
}
func (self *stream) SetDeadline(t time.Time) error {
self.SetReadDeadline(t)
self.SetWriteDeadline(t)
return nil
}
func (self *stream) SetReadDeadline(t time.Time) error {
self.rDeadLine = t
time.AfterFunc(t.Sub(time.Now()), self.state.Broadcast)
return nil
}
func (self *stream) SetWriteDeadline(t time.Time) error {
self.wDeadLine = t
time.AfterFunc(t.Sub(time.Now()), self.state.Broadcast)
return nil
}
func (self *stream) LocalAddr() net.Addr {
return &addr.Addr{self.network, self.local, self.lport}
}
func (self *stream) RemoteAddr() net.Addr {
return &addr.Addr{self.network, self.remote, self.rport}
}
func (self *stream) Op(cmd protocol.Command, body []byte) protocol.Op {
self.sLock.Lock()
var op = protocol.Op{
Cmd: cmd,
Local: self.local,
Remote: self.remote,
LPort: self.lport,
RPort: self.rport,
Data: skykiss.BytesPackage{Bytes: body},
}
self.sLock.Unlock()
return op
}
func (self *stream) subscribe(cmds ...protocol.Command) {
var filters = make([]transport.Filter, len(cmds))
for idx, cmd := range cmds {
filters[idx] = transport.Filter{
Cmd: cmd,
Local: self.remote,
Remote: self.local,
LPort: self.rport,
RPort: self.lport,
}
}
if self.connHndl != nil {
self.connHndl.Close()
}
self.connHndl = self.mpx.Handle(self.recv, filters...)
}
func newSocket(network string, local uint64, lport uint32, mpx transport.Transport) *stream {
var conn = &stream{
network: network,
local: local,
lport: lport,
mpx: mpx,
wndSize: WND_SIZE,
status: stNew,
}
conn.state.L = &conn.sLock
return conn
}
func NewServerSocket(
network string,
local uint64, lport uint32,
remote uint64, rport uint32,
mpx transport.Transport,
) net.Conn {
var conn = newSocket(network, local, lport, mpx)
conn.remote = remote
conn.rport = rport
conn.connHndl = mpx.Handle(
conn.recv,
)
conn.subscribe(opAck, opData, opErr, opFin1, opFin2, opData, opWndSize, opRewind)
conn.mpx.Queue(conn.Op(opSyn, nil))
return conn
}
func NewClientSocket(
network string,
local uint64, lport uint32,
mpx transport.Transport,
onCloseCb func(),
) net.Conn {
var conn = newSocket(network, local, lport, mpx)
conn.subscribe(opSyn)
conn.onCloseCb = onCloseCb
return conn
}