Support volatile messages

[nkzawa]

This PR adds socket#volatile().

We have to merge socketio/engine.io-client#375 to pass all tests.

Related: #283, #710, socketio/socket.io#2003

[rauchg]

We can do this without a function? If we make volatile an object that inherits from the parent.

[nkzawa]

Like expect.js does? I will work on it.

[rauchg]

👍

[nkzawa]

Done. I used Object.create to create an inherited object, but I'm not so confident about this.
I think this approach has a risk to change states of wrong objects.

[nkzawa]

Another way is to create a class only for flags which has minimum sets of methods and properties instead like:

function Flag(socket, flag) {
  this.flags = {};
  this.flags[flag] = true;
  this.socket = socket;
  // TODO: creates flag properties.
}

Flag.prototype.emit = function() {
  this.socket.flags = this.flags;
  this.socket.emit.apply(this.socket, arguments);
  return this.socket;
};

Flag.prototype.compress = function() {...}

// socket.js
function Socket() {
  ...
  this.volatile = new Flag(this, 'volatile');
}

[IsaiahJTurner]

any plan to finish this feature?

[tracycollins]

Any plans for this? It would be much appreciated. Thanks!

[cinderblock]

What is the state of this? I'd love to have this feature. As it stands, when my clients reconnect to the server, all of their pending requests come in at once and this causes some problems.

[H-s-O]

Bumping for updates on this feature.

[kroko]

Yet another bump. :)

[MadlyFX]

Another request for client>server volatile messaging

[darrachequesne]

Merged into 7ddad2c and included in v3.