forked from centrifugal/centrifugo
/
websocket.go
97 lines (85 loc) · 2.22 KB
/
websocket.go
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package sockjs
import (
"fmt"
"net/http"
"strings"
"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) {
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(sessID, h.options.DisconnectDelay, h.options.HeartbeatDelay)
if h.handlerFunc != nil {
go h.handlerFunc(sess)
}
receiver := newWsReceiver(conn)
sess.attachReceiver(receiver)
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{}
}
func newWsReceiver(conn *websocket.Conn) *wsReceiver {
return &wsReceiver{
conn: conn,
closeCh: make(chan struct{}),
}
}
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 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 }