tiny refactor: inline a tiny single-use fun and move another

router/connection.go

@@ -379,7 +379,9 @@ func (conn *LocalConnection) shutdown(err error) {
 		conn.Router.Ourself.DeleteConnection(conn)
 	}
 
-	stopTicker(conn.heartbeatTCP)
+	if conn.heartbeatTCP != nil {
+		conn.heartbeatTCP.Stop()
+	}
 
 	if conn.forwarder != nil {
 		conn.forwarder.Stop()
@@ -451,16 +453,3 @@ func (conn *LocalConnection) handleProtocolMsg(tag ProtocolTag, payload []byte)
 func (conn *LocalConnection) extendReadDeadline() {
 	conn.TCPConn.SetReadDeadline(time.Now().Add(TCPHeartbeat * 2))
 }
-
-func tickerChan(ticker *time.Ticker) <-chan time.Time {
-	if ticker != nil {
-		return ticker.C
-	}
-	return nil
-}
-
-func stopTicker(ticker *time.Ticker) {
-	if ticker != nil {
-		ticker.Stop()
-	}
-}

router/sleeve.go

@@ -1126,3 +1126,10 @@ func timerChan(timer *time.Timer) <-chan time.Time {
 	}
 	return nil
 }
+
+func tickerChan(ticker *time.Ticker) <-chan time.Time {
+	if ticker != nil {
+		return ticker.C
+	}
+	return nil
+}