/
socketclient.go
250 lines (225 loc) · 6.83 KB
/
socketclient.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
package socketclient
import (
"bufio"
"encoding/json"
"errors"
"bytes"
"fmt"
"sync/atomic"
"net"
"log"
"runtime"
"sync"
"strconv"
"time"
)
type SocketRequest struct {
request []byte
result interface{}
id int64
sent bool
responseChan chan error
}
const (
SocketReconnecting int32 = iota
SocketOpen
SocketClosed
)
type SocketClient struct {
state int32
conn *net.TCPConn
reader *bufio.Reader
address *net.TCPAddr
namespace string
reqid int64
changes sync.Mutex
queue map[int64]*SocketRequest
writeQueue chan *SocketRequest
writeQueueHead *SocketRequest
}
type SocketRemoteError struct {
RemoteError interface{}
}
func (sre *SocketRemoteError) Error() string {
return fmt.Sprintf("SocketRemoteError: %#v", sre.RemoteError)
}
var (
ErrReconnect = errors.New("Socket is reconnecting")
ErrShutdown = errors.New("Socket is shutting down")
)
func NewSocketClient(addr string, namespace string) (*SocketClient, error) {
address, err := net.ResolveTCPAddr("tcp",addr)
if err != nil {
return nil, err
}
pc := &SocketClient {
address: address,
state: SocketReconnecting,
queue: make(map[int64]*SocketRequest),
writeQueue: make(chan *SocketRequest,128),
writeQueueHead: nil,
namespace: namespace,
}
runtime.SetFinalizer(pc, (*SocketClient).Close)
go pc.writerRoutine()
go pc.readerRoutine()
return pc, nil
}
func (pc *SocketClient) Close() {
pc.changes.Lock()
defer pc.changes.Unlock()
if atomic.SwapInt32(&pc.state, SocketClosed) != SocketClosed {
close(pc.writeQueue)
}
}
func (pc *SocketClient) writerRoutine() {
writerloop: for {
switch atomic.LoadInt32(&pc.state) {
case SocketClosed:
pc.changes.Lock()
for _,v := range pc.queue {
v.responseChan <- ErrShutdown
}
pc.changes.Unlock()
break writerloop;
case SocketOpen:
//log.Printf("[SocketClient] Writer state: Open")
request := pc.writeQueueHead
if request == nil {
select {
case request = <- pc.writeQueue:
pc.writeQueueHead = request
if request == nil {
continue
}
case <- time.After(1*time.Second):
continue
}
}
_, err := pc.conn.Write(request.request)
if err != nil {
log.Printf("[SocketClient] Write failed: %s", err.Error())
atomic.CompareAndSwapInt32(&pc.state, SocketOpen, SocketReconnecting)
} else {
//log.Printf("[SocketClient] Wrote: %s", request.request)
pc.writeQueueHead = nil
request.sent = true
}
case SocketReconnecting:
//log.Printf("[SocketClient] Writer state: Recon")
pc.changes.Lock()
conn, err := net.DialTCP(pc.address.Network(), nil, pc.address)
if err == nil {
pc.reader = bufio.NewReader(conn)
pc.conn = conn
sentshit := make([]int64, 0, 32)
for k,v := range pc.queue {
if v.sent {
v.responseChan <- ErrReconnect
sentshit = append(sentshit, k)
}
}
for _,k := range sentshit {
delete(pc.queue, k)
}
atomic.CompareAndSwapInt32(&pc.state, SocketReconnecting, SocketOpen)
} else {
log.Printf("[SocketClient] Reconnect failed: %s", err.Error())
time.Sleep(5*time.Second)
}
pc.changes.Unlock()
}
}
}
func (pc *SocketClient) readerRoutine() {
readerloop: for {
switch atomic.LoadInt32(&pc.state) {
case SocketClosed:
break readerloop;
case SocketReconnecting:
time.Sleep(time.Second/10)
case SocketOpen:
pc.changes.Lock()
reader := pc.reader
pc.changes.Unlock()
line, err := reader.ReadBytes('\n')
//log.Printf("[SocketClient] Recv: %s", line)
if err != nil {
atomic.CompareAndSwapInt32(&pc.state, SocketOpen, SocketReconnecting)
} else {
err = pc.response(line)
if err != nil {
log.Printf("[SocketClient] invalid response (%s): %s", err.Error(), line)
}
}
}
}
}
func (pc *SocketClient) response(resp []byte) error {
dec := json.NewDecoder(bytes.NewReader(resp))
t, err := dec.Token()
if err != nil {
return err
}
if t != json.Delim('[') {
return errors.New("line not starting with [")
}
var reqidf float64
if !dec.More() {
return errors.New("response abruptly before request id")
}
err = dec.Decode(&reqidf)
if err != nil {
return err
}
reqid := int64(reqidf)
if !dec.More() {
return errors.New("response abruptly before error object")
}
var resErr interface{}
err = dec.Decode(&resErr)
if err !=nil {
return err
}
if !dec.More() {
return errors.New("response abruptly before result object")
}
pc.changes.Lock()
defer pc.changes.Unlock()
request, ok := pc.queue[reqid]
if !ok {
return errors.New("Unknown request id "+strconv.FormatInt(reqid, 10))
}
defer delete(pc.queue, reqid)
if resErr == nil {
err = dec.Decode(request.result)
request.responseChan <- err
return err
}
request.responseChan <- &SocketRemoteError{resErr}
return nil
}
func (pc *SocketClient) Exec(method string, args interface{}, result interface{}) error {
reqid := atomic.AddInt64(&pc.reqid, 1)
requestArray := []interface{}{
float64(reqid),
pc.namespace+":"+method,
args,
true,
}
requestBytes, err := json.Marshal(requestArray)
if err != nil {
return err
}
request := &SocketRequest{
id: reqid,
request: append(requestBytes, '\n'),
result: result,
responseChan: make(chan error),
}
pc.changes.Lock()
pc.queue[reqid] = request
pc.writeQueue <- request
pc.changes.Unlock()
return <- request.responseChan
}