how to detect that user's connection is lost in nodejs websocket(ws)

Question

how to detect that user's connection is lost in nodejs websocket(ws)

I have already used

ws.on('close',function(){});

but in some case even it is not working like if user network is lost, or LAN has been disconnected. So how can I check if user is connected or not, otherwise I have to delete that user from my user queue but for that I have to again check if he is connected..

javascript
node.js
websocket

Answer 1

You problem is network connection doesn't fire an event.

You can use some kind of tick function and check every given time if a user is connected. It will obviously not run if the client is not online.

I am using jQuery for Ajax clearity.

some thing to the effect of:

(psuedo code):

//Client
function tick(){
var date = new Date();
//I assume you node JS controller will listen to tick
$.post("tick", date ).done(setTimeout(tick,5 *60 *1000));
}

I don't know which DB you are using so I won't post code but you have to do something like saving the last tick there (or on cache/memory/redis should be good for this).

You will then have a function running over users last ticks.