server: allow to associate user data to sessions (#50)

serversession.go

@@ -163,6 +163,7 @@ type ServerSession struct {
 
 	ctx                 context.Context
 	ctxCancel           func()
+	userData            interface{}
 	conns               map[*ServerConn]struct{}
 	state               ServerSessionState
 	setuppedTracks      map[int]*ServerSessionSetuppedTrack
@@ -242,6 +243,16 @@ func (ss *ServerSession) AnnouncedTracks() Tracks {
 	return ss.announcedTracks
 }
 
+// SetUserData sets some user data associated to the session.
+func (ss *ServerSession) SetUserData(v interface{}) {
+	ss.userData = v
+}
+
+// UserData returns some user data associated to the session.
+func (ss *ServerSession) UserData() interface{} {
+	return ss.userData
+}
+
 func (ss *ServerSession) checkState(allowed map[ServerSessionState]struct{}) error {
 	if _, ok := allowed[ss.state]; ok {
 		return nil