On Feb 21, 2018 19:05, "Georg Lukas" <[email protected]> wrote:
Hi, Philipp H. pointed out an interesting issue today: MUC-PMs are sent by a MUC to all joined client full-JIDs, so if you are joined to a MUC with two devices, your account will see two copies of the messages. Your MAM archive is also going to store two copies of them, with different MAM-IDs, which makes later deduplication rather complicated (you can't rely on them having a message ID or an origin-id, and the timestamp might vary a bit). Do we want MUC-PMs stored in MAM at all? Yes, I do. And if yes, how can we prevent multiple copies from being stored? Didn't you suggest it above? Mandatory unique message IDs. Make them mandatory, and treat nonconforming clients and components as exactly that, nonconforming. Deprecate id-free messages; support them, but with caveat that dupes are possible. If an id is lacking, clients and MAMs can have an undefined behavior: store both, or dedupe based on (most of?) XML content. (Please ignore for a moment the synchronization problems that arise if you respond to MUC-PM copies before joining the respective MUC). Another nice corner case are messages to my own JID. Servers will send a "sent" Carbon Copy of them to all your other clients, then reflect the message to the "most available" client and send a Carbon Copy to all others. Each client ends up with two copies of each message, and the MAM archive probably as well. Does this make sense? Georg -- || http://op-co.de ++ GCS d--(++) s: a C+++ UL+++ !P L+++ !E W+++ N ++ || gpg: 0x962FD2DE || o? K- w---() O M V? PS+ PE-- Y++ PGP+ t+ 5 R+ || || Ge0rG: euIRCnet || X(+++) tv+ b+(++) DI+++ D- G e++++ h- r++ y? || ++ IRCnet OFTC OPN ||_________________________________________________|| _______________________________________________ Standards mailing list Info: https://mail.jabber.org/mailman/listinfo/standards Unsubscribe: [email protected] _______________________________________________
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