Handling session timeout and VPN disconnect

[swatiagarwal]

Hi Team,

I am using :
SmartClient Version: v11.1p_2017-07-24/PowerEdition Deployment (built 2017-07-24)

In my smartGWT application, i have three scenarios:
1. Session timeout occurs. In this case, whenever a request is fired i get an error "The server failed to return a formatted response at all."
2. The host is unreachable at an IP level (eg VPN disconnect.) In this case i get an error "Transport error - HTTP code: 0 for URL:"
3. A reload happens in the middle of a request being sent. Then i get an error "Transport error - HTTP code: 0 for URL:".

I want to show appropriate error in each case. Like "session timeout" in 1, and "Unable to connect to server" in case of 2. No message in case of 3.
If i use the LoginRequiredMarker like below, i get "Session Time Out" in all cases.
RPCManager.setLoginRequiredMarker("loginRequiredMarker");

RPCManager.setHandleErrorCallback(new HandleErrorCallback() {

@Override
public void handleError(DSResponse response, DSRequest request) {


final Dialog dialog = new Dialog();
dialog.setShowCloseButton(false);
dialog.setMessage("Session Time Out");
Button button = new Button("OK");
dialog.setButtons(button);
button.addClickHandler(new ClickHandler() {

@Override
public void onClick(ClickEvent event) {
Window.Location.assign(Window.Location.getPath());
dialog.hide();
}
});
dialog.draw();
}
});

How can i handle the cases differently. Please help

[Blama]

Hi swatiagarwal,

try this code very early in your onModuleLoad() for 2 and 3:

                RPCManager.setHandleTransportErrorCallback(new HandleTransportErrorCallback() {
                    @Override
                    public void handleTransportError(int transactionNum, int status, int httpResponseCode, String httpResponseText) {
                        RPCManager.cancelDefaultErrorHandling();
                        SC.warn(i18n.networkErrorTitle(), i18n.networkErrorMessage());
                    }
                });

For 1, see Relogin here.

Best regards
Blama

[swatiagarwal]

Hi Blama
Thanks for your reply.

I am using spring controller on server side and using RPCManager.setActionURL on client side to send server calls. Also, in some cases i am using GWT aync calls. I do not want to show the pop up to relogin. Instead i want to redirect the user to login page when session expires. I have used spring security and redirected to login page on session expired. But, currently, whenever the session expires, the application in not redirected to the login page.
How can i handle this. What string is given as the parameter in setLoginRequiredMarker() and is it required in my case.
Also, for case 2 and 3 above, is there a way to show different messages.

[Isomorphic]

The code Blama showed you already shows how to catch transport errors and show whatever message you want.

The Relogin overview already explains that you can redirect to a login page (it's literally the first bullet point of 3). We would recommend revisiting it and giving it a much closer read.