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



<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
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