Re: [Simple] Message Stateful MSRP Switches (was Re: Multi-party chatWGLC?)

["Geir Arne Sandbakken" <geir.sandbakken at tandberg.com>]

Ben,

It will be hard to avoid being stateful. The headers of the
"message/cpim" wrapper might be split in two chunks.  The switch must be
stateful until a full header set is received. The chunk example in -05
shows a split in the headers of the "message/cpim" wrapper.

Thanks,
Geir Arne

-----Original Message-----
From: simple-bounces at ietf.org [mailto:simple-bounces at ietf.org] On Behalf
Of Ben Campbell
Sent: 13. oktober 2009 00:05
To: Geir Arne Sandbakken
Cc: simple at ietf.org
Subject: [Simple] Message Stateful MSRP Switches (was Re: Multi-party
chatWGLC?)

<as individual>

I'm still in the process of reviewing this version, but I want to  
point out one particular change that went in as a result of the  
previous WGLC feedback:

Both versions rely on "message/cpim" metatdata for certain MSRP  
message routing and authorization decisions. The previous version  
overlooked the possibility of a large message being sent as a series  
of chunks. Chunking occurs after MIME encoding. When a message/cpim  
document gets chunked, the metadata will only be present in the first  
chunk. Revision 4 assumed that each MSRP send request would include  
the metatdata.

Revision 5 deals with this by requiring the MSRP switch to be message  
stateful. It has to remember the message/cpim metadata until it  
processes all chunks of a given message. This metadata "state" is  
indexed by the MSRP Message-ID header field., which is the same for  
all chunks of a given message.

IMO, this is the best approach of any that I have heard of so far. It  
is unfortunate that we need to keep message state, but I don't see an  
alternative short of forbidding chunking of messages to an MSRP switch.

What do other people think about this?

Thanks!

Ben.



On Oct 9, 2009, at 3:39 AM, Geir Arne Sandbakken wrote:

> Experts,
>
> The 05 version resolves the issues raised in the first WGLC of the  
> draft.  Does the WG think it is ready for another WGLC?
>
> Thanks,
> Geir Arne
> _______________________________________________
> Simple mailing list
> Simple at ietf.org
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