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
|
package sockjs
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/gorilla/websocket"
)
// WebSocketReadBufSize is a parameter that is used for WebSocket Upgrader.
// https://github.com/gorilla/websocket/blob/master/server.go#L230
var WebSocketReadBufSize = 4096
// WebSocketWriteBufSize is a parameter that is used for WebSocket Upgrader
// https://github.com/gorilla/websocket/blob/master/server.go#L230
var WebSocketWriteBufSize = 4096
func (h *handler) sockjsWebsocket(rw http.ResponseWriter, req *http.Request) {
var conn *websocket.Conn
var err error
if h.options.WebsocketUpgrader != nil {
conn, err = h.options.WebsocketUpgrader.Upgrade(rw, req, nil)
} else {
// use default as before, so that those 2 buffer size variables are used as before
conn, err = websocket.Upgrade(rw, req, nil, WebSocketReadBufSize, WebSocketWriteBufSize)
}
if _, ok := err.(websocket.HandshakeError); ok {
http.Error(rw, `Can "Upgrade" only to "WebSocket".`, http.StatusBadRequest)
return
} else if err != nil {
rw.WriteHeader(http.StatusInternalServerError)
return
}
sessID, _ := h.parseSessionID(req.URL)
sess := newSession(req, sessID, h.options.DisconnectDelay, h.options.HeartbeatDelay)
receiver := newWsReceiver(conn, h.options.WebsocketWriteTimeout)
sess.attachReceiver(receiver)
if h.handlerFunc != nil {
go h.handlerFunc(sess)
}
readCloseCh := make(chan struct{})
go func() {
var d []string
for {
err := conn.ReadJSON(&d)
if err != nil {
close(readCloseCh)
return
}
sess.accept(d...)
}
}()
select {
case <-readCloseCh:
case <-receiver.doneNotify():
}
sess.close()
conn.Close()
}
type wsReceiver struct {
conn *websocket.Conn
closeCh chan struct{}
writeTimeout time.Duration
}
func newWsReceiver(conn *websocket.Conn, writeTimeout time.Duration) *wsReceiver {
return &wsReceiver{
conn: conn,
closeCh: make(chan struct{}),
writeTimeout: writeTimeout,
}
}
func (w *wsReceiver) sendBulk(messages ...string) {
if len(messages) > 0 {
w.sendFrame(fmt.Sprintf("a[%s]", strings.Join(transform(messages, quote), ",")))
}
}
func (w *wsReceiver) sendFrame(frame string) {
if w.writeTimeout != 0 {
w.conn.SetWriteDeadline(time.Now().Add(w.writeTimeout))
}
if err := w.conn.WriteMessage(websocket.TextMessage, []byte(frame)); err != nil {
w.close()
}
}
func (w *wsReceiver) close() {
select {
case <-w.closeCh: // already closed
default:
close(w.closeCh)
}
}
func (w *wsReceiver) canSend() bool {
select {
case <-w.closeCh: // already closed
return false
default:
return true
}
}
func (w *wsReceiver) doneNotify() <-chan struct{} { return w.closeCh }
func (w *wsReceiver) interruptedNotify() <-chan struct{} { return nil }
|
