Call on_connection_failed() when the connection fails to be established

src/network/socket_handler.cpp

@@ -155,6 +155,9 @@ void SocketHandler::on_recv()
   else if (-1 == size)
     {
       log_warning("Error while reading from socket: " << strerror(errno));
+      if (this->connecting)
+        this->on_connection_failed(strerror(errno));
+      else
         this->on_connection_close();
       this->close();
     }