DJabberd::Plugin::Balancer (Was: Re: XMPP Perlbal-like implementation)

[Daniel Ruoso]

Qua, 2008-04-09 às 17:54 +0100, Daniel Ruoso escreveu:
> Qua, 2008-04-09 às 15:04 +0100, Daniel Ruoso escreveu:
> > The idea is pretty simple, the component registers itself in some
> > server, and accepts connection from clients, allowing a JID to
> connect
> > more than once, and then dispatch the incoming messages to the
> clients
> > grouped by the jid, doing a job very similar to the one done by
> perlbal.
> After some more code browsing, I think I found out where to implement
> that feature, it seems that I just have to create a VHost subclass
> that
> overrides register_jid, find_jid and unregister_jid.
> I can do a simple trick of registering the jid with a postfix of, for
> instance, '#'.$sock, and keep a HoA with the full jid and all
> connections for that jid. In find_jid it's then just a matter of
> choosing which $sock to return.

I've just saw that the server might actually reply a different JID than
the user had requested. That way, the client will actually have a JID
with the sufix, but the server will keep track of which clients tried to
connect to the original resource and load balance based on that.

Cool...

I'll be implementing DJabberd::Plugin::Balancer that will re-bless the
vhost with a subclass that takes care of that.

BTW... for the moment, the load balancing will be round-robin. While the
Perlbal concept of delivering to whatever backend is available is cool,
this is not possible for XMPP because the backend job is asynchronous.

daniel