connection 도 room을 알고 있게 됨

wshandler/room.go

@@ -13,14 +13,17 @@ type room struct {
 	outChan     chan *wsconn
 	messageChan chan *UpstreamMessage
 	name        string
+	destroyChan chan<- string
 }
 
-func makeRoom(name string) *room {
+// 만약 destroyChan가 nil이면 room이 비어도 파괴되지 않는다. 영구 유지되는 room
+func makeRoom(name string, destroyChan chan<- string) *room {
 	return &room{
 		inChan:      make(chan *wsconn, 10),
 		outChan:     make(chan *wsconn, 10),
 		messageChan: make(chan *UpstreamMessage, 100),
 		name:        name,
+		destroyChan: destroyChan,
 	}
 }
 
@@ -28,12 +31,14 @@ func (r *room) broadcast(msg *UpstreamMessage) {
 	r.messageChan <- msg
 }
 
-func (r *room) in(conn *wsconn) {
+func (r *room) in(conn *wsconn) *room {
 	r.inChan <- conn
+	return r
 }
 
-func (r *room) out(conn *wsconn) {
+func (r *room) out(conn *wsconn) *room {
 	r.outChan <- conn
+	return r
 }
 
 func (r *room) start(ctx context.Context) {
@@ -66,6 +71,10 @@ func (r *room) loop(ctx context.Context, conns *map[string]*wsconn) (normalEnd b
 
 		case conn := <-r.outChan:
 			delete((*conns), conn.sender.Accid.Hex())
+			if len(*conns) == 0 && r.destroyChan != nil {
+				r.destroyChan <- r.name
+				return true
+			}
 
 		case msg := <-r.messageChan:
 			ds := DownstreamMessage{