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|
package sockjs
import (
"encoding/json"
"net/http"
"time"
"github.com/gorilla/websocket"
)
func (h *handler) rawWebsocket(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 := ""
sess := newSession(req, sessID, h.options.DisconnectDelay, h.options.HeartbeatDelay)
sess.raw = true
receiver := newRawWsReceiver(conn, h.options.WebsocketWriteTimeout)
sess.attachReceiver(receiver)
if h.handlerFunc != nil {
go h.handlerFunc(sess)
}
readCloseCh := make(chan struct{})
go func() {
for {
frameType, p, err := conn.ReadMessage()
if err != nil {
close(readCloseCh)
return
}
if frameType == websocket.TextMessage || frameType == websocket.BinaryMessage {
sess.accept(string(p))
}
}
}()
select {
case <-readCloseCh:
case <-receiver.doneNotify():
}
sess.close()
conn.Close()
}
type rawWsReceiver struct {
conn *websocket.Conn
closeCh chan struct{}
writeTimeout time.Duration
}
func newRawWsReceiver(conn *websocket.Conn, writeTimeout time.Duration) *rawWsReceiver {
return &rawWsReceiver{
conn: conn,
closeCh: make(chan struct{}),
writeTimeout: writeTimeout,
}
}
func (w *rawWsReceiver) sendBulk(messages ...string) {
if len(messages) > 0 {
for _, m := range messages {
if w.writeTimeout != 0 {
w.conn.SetWriteDeadline(time.Now().Add(w.writeTimeout))
}
err := w.conn.WriteMessage(websocket.TextMessage, []byte(m))
if err != nil {
w.close()
break
}
}
}
}
func (w *rawWsReceiver) sendFrame(frame string) {
if w.writeTimeout != 0 {
w.conn.SetWriteDeadline(time.Now().Add(w.writeTimeout))
}
var err error
if frame == "h" {
err = w.conn.WriteMessage(websocket.PingMessage, []byte{})
} else if len(frame) > 0 && frame[0] == 'c' {
status, reason := parseCloseFrame(frame)
msg := websocket.FormatCloseMessage(int(status), reason)
err = w.conn.WriteMessage(websocket.CloseMessage, msg)
} else {
err = w.conn.WriteMessage(websocket.TextMessage, []byte(frame))
}
if err != nil {
w.close()
}
}
func parseCloseFrame(frame string) (status uint32, reason string) {
var items [2]interface{}
json.Unmarshal([]byte(frame)[1:], &items)
statusF, _ := items[0].(float64)
status = uint32(statusF)
reason, _ = items[1].(string)
return
}
func (w *rawWsReceiver) close() {
select {
case <-w.closeCh: // already closed
default:
close(w.closeCh)
}
}
func (w *rawWsReceiver) canSend() bool {
select {
case <-w.closeCh: // already closed
return false
default:
return true
}
}
func (w *rawWsReceiver) doneNotify() <-chan struct{} { return w.closeCh }
func (w *rawWsReceiver) interruptedNotify() <-chan struct{} { return nil }
|
