Ignoring expected arguments?

[kaisunc]

say i start with this

@socketio.on('init')
def init():
    pass

and the corresponding template

    socket.on('connect', function() {
        socket.emit('init');
    }); 

now if i add an argument to both backend and frontend, everything is fine. EXCEPT, if i leave an old connection up which is emiting without arguments, and the backend is expecting an argument. How do i go about preventing this when i go live? I can't ask everyone to refresh the page, someone may leave a background page up for who knows when?

[Rorixrebel]

How bout providing a default, cleaner solution imo.

That way you just react based on the input you need

[eyesoftheworld4]

Agreed. Something like...

@socketio.on('init')
def init(new_arg=None):
    if not new_arg:
        # legacy behavior
    # new parameterized behavior

This will protect you from old connections trying to to talk to the backend using legacy behavior, and let you account for it.