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package sockjs
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/gorilla/websocket"
)
func (h *Handler) sockjsWebsocket(rw http.ResponseWriter, req *http.Request) {
upgrader := h.options.WebsocketUpgrader
if upgrader == nil {
upgrader = new(websocket.Upgrader)
}
conn, err := upgrader.Upgrade(rw, req, nil)
if err != nil {
return
}
sessID, _ := h.parseSessionID(req.URL)
sess := newSession(req, sessID, h.options.DisconnectDelay, h.options.HeartbeatDelay)
receiver := newWsReceiver(conn, h.options.WebsocketWriteTimeout)
if err := sess.attachReceiver(receiver); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
if h.handlerFunc != nil {
go h.handlerFunc(Session{sess})
}
readCloseCh := make(chan struct{})
go func() {
var d []string
for {
err := conn.ReadJSON(&d)
if err != nil {
close(readCloseCh)
return
}
if err := sess.accept(d...); err != nil {
close(readCloseCh)
return
}
}
}()
select {
case <-readCloseCh:
case <-receiver.doneNotify():
}
sess.close()
if err := conn.Close(); err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
}
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) error {
if len(messages) > 0 {
return w.sendFrame(fmt.Sprintf("a[%s]", strings.Join(transform(messages, quote), ",")))
}
return nil
}
func (w *wsReceiver) sendFrame(frame string) error {
if w.writeTimeout != 0 {
if err := w.conn.SetWriteDeadline(time.Now().Add(w.writeTimeout)); err != nil {
w.close()
return err
}
}
if err := w.conn.WriteMessage(websocket.TextMessage, []byte(frame)); err != nil {
w.close()
return err
}
return nil
}
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 }
func (w *wsReceiver) receiverType() ReceiverType { return ReceiverTypeWebsocket }
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