Node.js and Socket.IO - How to reconnect as soon as disconnect happens

Question

I\'m building a small prototype with node.js and socket.io. Everything is working well, the only issue I\'m facing is that my node.js connection will disconnect and I\'m fo

Answer 1

edit: Socket.io has builtin-support now

When I used socket.io the disconnect did not happen(only when i closed the server manually). But you could just reconnect after say for example 10 seconds on failure or something on disconnect event.

socket.on('disconnect', function(){
   // reconnect
});

I came up with the following implementation:

client-side javascript

var connected = false;
const RETRY_INTERVAL = 10000;
var timeout;

socket.on('connect', function() {
  connected = true;
  clearTimeout(timeout);
  socket.send({'subscribe': 'schaftenaar'});
  content.html("Connected to server.");
});

socket.on('disconnect', function() {
  connected = false;
  console.log('disconnected');
  content.html("Disconnected! Trying to automatically to reconnect in " +                   
                RETRY_INTERVAL/1000 + " seconds.");
  retryConnectOnFailure(RETRY_INTERVAL);
});

var retryConnectOnFailure = function(retryInMilliseconds) {
    setTimeout(function() {
      if (!connected) {
        $.get('/ping', function(data) {
          connected = true;
          window.location.href = unescape(window.location.pathname);
        });
        retryConnectOnFailure(retryInMilliseconds);
      }
    }, retryInMilliseconds);
  }

// start connection
socket.connect();
retryConnectOnFailure(RETRY_INTERVAL);

serverside(node.js):

// express route to ping server.
app.get('/ping', function(req, res) {
    res.send('pong');
});