guard dials

Author: shogo82148

connector.go

@@ -37,7 +37,10 @@ func (c Connector) Connect(ctx context.Context) (driver.Conn, error) {
 
 	// Connect to Server
 	// TODO: needs RegisterDialContext
-	if dial, ok := dials[mc.cfg.Net]; ok {
+	dialsLock.RLock()
+	dial, ok := dials[mc.cfg.Net]
+	dialsLock.RUnlock()
+	if ok {
 		mc.netConn, err = dial(mc.cfg.Addr)
 	} else {
 		nd := net.Dialer{Timeout: mc.cfg.Timeout}