How to manipulate client connections

Question

I'm making an on-line multiple players game using Opa，and have some questions on how to manipulate client connections.

Here is my code extract:

function game_view(){
    function page_ready(){
        // observe game messages
        _ = Network.observe(game_msg_received,game_channel);

        // set disconnect function
        _ = ClientEvent.set_on_disconnect_client(function(c){
            //do something when client is disconnected  
            ...
        });
    }

    <div onready={function(_){ page_ready() }}>
        //page content
        ...
    </div>
}

1. The disconnect function takes effect about 2 minutes (I guess it's the time of 4 ping failures) after I close my tab or window, it's too long for my case, can I adjust it and how?

2. When I leave this page (close the tab or jump to other pages), after a while some error messages will appear as follow:

[SESSION] Uncaught exception: "{OpaRPC_Server: {timeout: {client: {client: $"46rrpwmeiq28ql0d8lgz7e35zt8d701c"$; page: $934885115$}; fun_id: $"__set_game_Mygame"$}}}" The following message is skipped.: If you want (msg, st, ctx) debug printing set debug variable session_debug >= 200

I think it's because the page does not exist any more but function 'game_msg_received' still try to notify this page when game message is received, then how can I avoid this error?

Answer 1

1 - You can't change the disconnection delay, but perhaps you can use the inactive event.

This event is raised if the client has no activity of the point of view of server (rpc calls, sends messages, ...)

Use ClientEvent.set_on_inactive_client to register a callback for the inactive event and ClientEvent.set_inactivity_delay to change the duration.

2 - Indeed it's because the page does not exists any more. You should remove your observer from the network. Use Network.unobserve for this.

Finally your code should look something like that

// set default inactive delay
// or if you change the 1st params 
// you can set for a specific client 
ClientEvent.set_inactive_delay(none, /*wanted delay*/)

function page_ready(){
    // observe game messages
    obs = Network.observe(game_msg_received,game_channel);

    // set inactive function
    _ = ClientEvent.set_on_inactive_client(function(c){
        // remove the observer
        Network.unobserve(obs);
        //do something when client is disconnected  
        ...
    });
}