Concurrency issues can occur when using this framework for websocket transfers

[chenbaoding2818]

WARNING: DATA RACE
Read at 0x00c0004610f8 by goroutine 14:
github.com/gorilla/websocket.(*Conn).beginMessage()
/Users/vendor/github.com/gorilla/websocket/conn.go:472 +0x65
github.com/gorilla/websocket.(*Conn).WriteMessage()
/Users/vendor/github.com/gorilla/websocket/conn.go:757 +0xf9
github.com/apache/dubbo-getty.(*gettyWSConn).writePing()
/Users/vendor/github.com/apache/dubbo-getty/connection.go:627 +0x68
github.com/apache/dubbo-getty.heartbeat.func1()
/Users/vendor/github.com/apache/dubbo-getty/session.go:519 +0x6d
github.com/apache/dubbo-getty.heartbeat()
/Users/vendor/github.com/apache/dubbo-getty/session.go:533 +0x167
github.com/dubbogo/gost/time.(*TimerWheel).run()
/Users/vendor/github.com/dubbogo/gost/time/timer.go:281 +0x2b9
github.com/dubbogo/gost/time.NewTimerWheel.func1()
/Users/vendor/github.com/dubbogo/gost/time/timer.go:216 +0x4a4

Previous write at 0x00c0004610f8 by goroutine 7976:
github.com/gorilla/websocket.(*messageWriter).endMessage()
/Users/vendor/github.com/gorilla/websocket/conn.go:539 +0xcd
github.com/gorilla/websocket.(*messageWriter).flushFrame()
/Users/vendor/github.com/gorilla/websocket/conn.go:626 +0xb85
github.com/gorilla/websocket.(*Conn).WriteMessage()
/Users/vendor/github.com/gorilla/websocket/conn.go:763 +0x1d0
github.com/apache/dubbo-getty.(*gettyWSConn).send()
/Users/vendor/github.com/apache/dubbo-getty/connection.go:618 +0x117
github.com/apache/dubbo-getty.(*session).WritePkg()
/Users/vendor/github.com/apache/dubbo-getty/session.go:408 +0x3a7
server/common/net.(*Session).Write()

[chenbaoding2818]