forked from igm/sockjs-go
/
rawwebsocket.go
157 lines (143 loc) · 3.49 KB
/
rawwebsocket.go
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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) {
upgrader := h.options.WebsocketUpgrader
if upgrader == nil {
upgrader = new(websocket.Upgrader)
}
conn, err := upgrader.Upgrade(rw, req, nil)
if err != nil {
return
}
sessID := ""
sess := newSession(req, sessID, h.options.DisconnectDelay, h.options.HeartbeatDelay)
sess.raw = true
receiver := newRawWsReceiver(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() {
for {
frameType, p, err := conn.ReadMessage()
if err != nil {
close(readCloseCh)
return
}
if frameType == websocket.TextMessage || frameType == websocket.BinaryMessage {
if err := sess.accept(string(p)); 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 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) error {
if len(messages) > 0 {
for _, m := range messages {
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(m)); err != nil {
w.close()
return err
}
}
}
return nil
}
func (w *rawWsReceiver) 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 frame == "h" {
if err := w.conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
w.close()
return err
}
} else if len(frame) > 0 && frame[0] == 'c' {
status, reason, err := parseCloseFrame(frame)
if err != nil {
w.close()
return err
}
msg := websocket.FormatCloseMessage(int(status), reason)
if err := w.conn.WriteMessage(websocket.CloseMessage, msg); err != nil {
w.close()
return err
}
} else {
if err := w.conn.WriteMessage(websocket.TextMessage, []byte(frame)); err != nil {
w.close()
return err
}
}
return nil
}
func (w *rawWsReceiver) receiverType() ReceiverType {
return ReceiverTypeRawWebsocket
}
func parseCloseFrame(frame string) (status uint32, reason string, err error) {
var items [2]interface{}
if err := json.Unmarshal([]byte(frame)[1:], &items); err != nil {
return 0, "", err
}
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 }