healthCheckHandler 로그 추가

server.go

@@ -73,7 +73,10 @@ func healthCheckHandler(w http.ResponseWriter, r *http.Request) {
 
 	// 한번이라도 들어오면 lb에 붙어있다는 뜻
 	if t := atomic.AddInt64(&healthcheckcounter, 1); t < 0 {
+		logger.Println("healthCheckHandler return StatusServiceUnavailable :", t)
 		w.WriteHeader(http.StatusServiceUnavailable)
+	} else {
+		logger.Println("healthCheckHandler return StatusOK :", t)
 	}
 }
 
@@ -127,11 +130,18 @@ func (server *Server) shutdown() {
 
 	signal.Stop(server.interrupt)
 
-	if atomic.LoadInt64(&healthcheckcounter) > 0 {
-		atomic.StoreInt64(&healthcheckcounter, math.MinInt64)
-		for atomic.LoadInt64(&healthcheckcounter)-math.MinInt64 == 0 {
+	if t := atomic.LoadInt64(&healthcheckcounter); t > 0 {
+		logger.Println("http server shutdown. healthcheckcounter :", t)
+
+		t = math.MinInt64
+		atomic.StoreInt64(&healthcheckcounter, t)
+		for ; t-math.MinInt64 > 0; t = atomic.LoadInt64(&healthcheckcounter) {
+			logger.Println("    waiting for healthcheckcounter increase y lb", t-math.MinInt64)
 			time.Sleep(100 * time.Millisecond)
 		}
+		logger.Println("http server shutdown. healthcheck completed")
+	} else {
+		logger.Println("http server shutdown. no lb")
 	}
 
 	if server.httpserver != nil {