[Standards-JIG] Re: [jdev] XMPP Ping method?

[Peter Saint-Andre]

Chris Mullins wrote:
> That's quite a bit more complicated that I envisioned.
> 
> I was just thinking "IQ:Ping", and leave it there. For all of the use
> cases I've come across, this would be sufficient.

Probably it would be good to break the ping stuff out into a separate
namespace and/or spec.

Do we need this to check a single stream only, or also to check the
end-to-end connection?

If the former then Justin's top-level <ping/> and <pong/> elements would
probably be acceptable (but see below).

If the latter then we need to use (addressable) IQs:

  <iq from='romeo at montague.net/foo' to='juliet at capulet.com/bar'
      type='set' id='ping123'>
    <ping xmlns='urn:xmpp:ping'/>
  </iq>

  <iq from='juliet at capulet.com/bar' to='romeo at montague.net/foo'
      type='result' id='ping123'/>

In general I prefer the IQ semantics vs. a top-level element, since XMPP
is set up for such extended namespaces. So we could just as well send
this over a stream:

  <iq type='set' id='ping234'>
    <ping xmlns='urn:xmpp:ping'/>
  </iq>

  <iq type='result' id='ping234'/>

That's not much bigger than the top-level elements:

  <ping xmlns='urn:xmpp:ping'/>

  <pong xmlns='urn:xmpp:ping'/>

And if the other side doesn't support the ping namespace it would return
an error (which accomplishes the same purpose):

  <iq type='error' id='ping234'>
    <ping xmlns='urn:xmpp:ping'/>
    <error type='cancel'>
      <service-unavailable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
    </error>
  </iq>

IMHO we don't need stream feature negotiation to do pings, but we do
need that for per-stanza acks (which are heavier).

Thoughts?

Peter

-- 
Peter Saint-Andre
Jabber Software Foundation
http://www.jabber.org/people/stpeter.shtml

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