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package main
import (
"io/ioutil"
"net"
"sync"
"github.com/centrifugal/centrifuge"
"github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
)
const websocketTransportName = "websocket"
type customWebsocketTransport struct {
mu sync.RWMutex
closed bool
closeCh chan struct{}
conn net.Conn
protoType centrifuge.ProtocolType
}
func newWebsocketTransport(conn net.Conn, protoType centrifuge.ProtocolType) *customWebsocketTransport {
return &customWebsocketTransport{
conn: conn,
protoType: protoType,
closeCh: make(chan struct{}),
}
}
// Name implementation.
func (t *customWebsocketTransport) Name() string {
return websocketTransportName
}
// Protocol implementation.
func (t *customWebsocketTransport) Protocol() centrifuge.ProtocolType {
return t.protoType
}
// Encoding implementation.
func (t *customWebsocketTransport) Encoding() centrifuge.EncodingType {
return centrifuge.EncodingTypeJSON
}
func (t *customWebsocketTransport) read() ([]byte, bool, error) {
t.mu.Lock()
defer t.mu.Unlock()
h, r, err := wsutil.NextReader(t.conn, ws.StateServerSide)
if err != nil {
return nil, false, err
}
if h.OpCode.IsControl() {
return nil, true, wsutil.ControlFrameHandler(t.conn, ws.StateServerSide)(h, r)
}
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, false, err
}
return data, false, nil
}
func (t *customWebsocketTransport) Write(data []byte) error {
select {
case <-t.closeCh:
return nil
default:
messageType := ws.OpText
if t.Protocol() == centrifuge.ProtocolTypeProtobuf {
messageType = ws.OpBinary
}
if err := wsutil.WriteServerMessage(t.conn, messageType, data); err != nil {
return err
}
return nil
}
}
// Close implementation.
func (t *customWebsocketTransport) Close(disconnect *centrifuge.Disconnect) error {
t.mu.Lock()
if t.closed {
t.mu.Unlock()
return nil
}
t.closed = true
close(t.closeCh)
t.mu.Unlock()
if disconnect != nil {
data := ws.NewCloseFrameBody(ws.StatusCode(disconnect.Code), disconnect.CloseText())
_ = wsutil.WriteServerMessage(t.conn, ws.OpClose, data)
return t.conn.Close()
}
data := ws.NewCloseFrameBody(ws.StatusNormalClosure, "")
_ = wsutil.WriteServerMessage(t.conn, ws.OpClose, data)
return t.conn.Close()
}
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