* Fix controller timer handler not return when error occurred
* Fix controller not close http response correctly
This PR aims to fix controller not close response correctly. Also, I’ve check all over the project there is no more resource leak issues exist after this patch.
* Fix controller not return immediately when error occurred
* Sort import
Establish a proxy server from the controller to the log database.
Redirect query commands send from client to database then proxy back the db response.
Use parameter binding instead of fmt.Sprintf to prevent SQL injection.
