[standards-jig] Stream Contexts

Thomas Muldowney temas at box5.net
Wed Jun 25 15:44:43 UTC 2003


I'm sorry, but what is the SI JEP doing?  Or is "context", which you
never fully explain, something magically different?

--temas


On Wed, 2003-06-25 at 06:42, Justin Karneges wrote:
> Hi all,
> 
> I had a brainstorm last night (morning?) and I have concluded that one 
> annoying problem with this stream negotiation stuff is that we don't have a 
> clear way of passing context.
> 
> Context is required to use a stream (S5B,IBB,anything else that arises).  
> There is never a time when you would not have context.  Maybe you don't want 
> SI or REL, but you will surely want context.  It's the one thing we should 
> all be able to agree on.
> 
> I can see two possible ways to pass context to a stream:
> 
> 1) Pass it inside of the datastream itself.
>  or
> 2) Pass it via the XML handshake of the stream.
> 
> #1 is like TCP.  Think of HTTP GET.  However, since Jabber streams have much 
> fancier handshakes, we can easily accommodate context inside of the XML 
> exchange, so I'd prefer #2.  Unfortunately, without a standard provision for 
> this, the only acceptable way to pass context with S5B/IBB currently is via 
> the datastream.
> 
> I propose to author a JEP to describe stream context.  It will be the world's 
> simplest JEP, with the following requirements:
> 
> * Contexts are simply opaque strings
> * Contexts must be unique for all streams
> * Streams must have a provision for passing along the context
> 
> Example of S5B using a possible standard context:
> 
>   <iq 
>       type='set' 
>       from='initiator at host1/foo' 
>       to='target at host2/bar' 
>       id='initiate'>
>     <query
>       xmlns='http://www.jabber.org/protocol/bytestream'
>       sid='mySID'
>       xmlns:context='http://jabber.org/protocol/streamcontext'
>       context:id='myCID'>
>       <streamhost 
>           jid='initiator at host1/foo' 
>           host='192.168.4.1' 
>           port='5086'/>
>     </query>
>   </iq>
> 
> Thoughts?
> 
> -Justin
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