concurrent write to websocket connection about websocket HOT 2 OPEN

Hey @go-slark,

Was browsing and saw your issue. Ensure that you're using a mutex for your write operations to prevent any overlap. Kind of like this:

func (s *Session) write() {
   ...
   for {
      ...
      s.writeMutex.Lock()
      select {
      case m := <-s.out:
         ...
         s.writeMutex.Unlock()
         ...
      case <-tk.C:
         ...
         s.writeMutex.Unlock()
         ...
      }
   }
}

from websocket.

The same problem.
When I run my code with the race flag go run -race ./main.go I get a message:

WARNING: DATA RACE
Read at 0x00c00020e078 by goroutine 7:
github.com/gorilla/websocket.(*Conn).beginMessage()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/conn.go:492 +0x5c
github.com/gorilla/websocket.(*Conn).WriteMessage()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/conn.go:779 +0xeb
.....

Previous write at 0x00c00020e078 by goroutine 10:
github.com/gorilla/websocket.(*messageWriter).endMessage()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/conn.go:561 +0xba
github.com/gorilla/websocket.(*messageWriter).flushFrame()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/conn.go:648 +0xb84
github.com/gorilla/websocket.(*messageWriter).Close()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/conn.go:746 +0x8f
github.com/gorilla/websocket.(*Conn).WriteJSON()
/home/yash/go/pkg/mod/github.com/gorilla/[email protected]/json.go:29 +0x15e
.....

from websocket.