Server requests accumulating indefinately

ServiceStack Server Events
21

There is no error, the application continues to work, so it is not stuck in ss-utils. Just event-source GET is not reissued. Is there a place in ss-util to put breakpoint for tracking this?

22

A failed heartbeat should execute this code which does the reconnecting.

23

Sorry for delay, I missed notification about your response.

I think I understand why it does not work.

When IISRESET is issued, reconnectServerEvents gets control, it closes the previous EventSource and opens a new one. When ā€˜onConnectā€™ message comes, heartbeat resumes and reconnectServerEvents is assigned again as error function for AJAX.

However new EventSource fails to connect since IISRESET lasts number of seconds (~20 in our case), so onConnect never comes.

Any idea how to fix this?

24

Can you let me know if this helps:

$.ss.handlers.onReconnect = function() { 
  this.onerror = function() { $.ss.reconnectServerEvents({ errorArgs: arguments }); };
};
25

Tried but nothing changed.
Was I supposed to put it into the application code?

26

Yeah after the call to $(source).handleServerEvents({ ... });

Can you try adding logging to see if itā€™s getting called, e.g:

$.ss.handlers.onReconnect = function() { 
    this.onerror = function() { 
        console.log("EventSource Error, reconnecting...", arguments, this);
        $.ss.reconnectServerEvents({ errorArgs: arguments }); 
    };
};

If it logs anything can you post it here?

27

Yes, I put it after handleServerEvents

No, the message does not appear on console.

28

Hmm, weird EventSource isnā€™t raising an error event when it canā€™t connect, can you try adding it on the EventSource instance directly:

source.onerror = function() { 
    console.log("EventSource Error, reconnecting...", arguments, this);
    $.ss.reconnectServerEvents({ errorArgs: arguments }); 
};

If thereā€™s no change try using a timer:

$.ss.handlers.onReconnect = function() {
    window.setTimeout(function() {
        if (!$.ss.eventSource || $.ss.eventSource.readyState == 2)
            $.ss.reconnectServerEvents();
    }, 10000);
};
29

Now it works (the first variant).
However it tries to reconnect many times until IISRESET terminates.
Can we add a delay between reconnection attempts?

30

You can try merging them :slight_smile:

source.onerror = function() { 
    window.setTimeout(function() {
        if (!$.ss.eventSource || $.ss.eventSource.readyState == 2)
            $.ss.reconnectServerEvents();
    }, 10000);
};
31

Somehow this does not help, I put timeout of 2 sec, still many event-stream request and messages appeared every second.

32

Sorry, my fault, compilation failed, Iā€™ll retest now.

33

It works now, thanks a lot.

1 Like