[PATCH] UUIDv7 for MAM

[Stephen Paul Weber]

This patch set adds the ability to generate UUIDv7 to the util.uuid module, and uses it in mod_storage_internal and mod_storage_sql for the mam ids, setting the node portion to a merkel hash based on previous mam id and appended stanza id -- this allows verifying at any point that there is not a gap in the history.

[Stephen Paul Weber]

Hmm, seems the UI here doesn't allow file attachments anymore, oops.  Here it is: https://0x0.st/HVAO.hg

[Kim Alvefur]

On Mon, Sep 25, 2023 at 09:10:06AM -0700, Stephen Paul Weber wrote:
>This patch set adds the ability to generate UUIDv7 to the util.uuid module,

I have a patch for this with wider Lua version compatibility,
timestamped 2021 that hasn't been merged because nothing uses UUIDv7.

>and uses it in mod_storage_internal and mod_storage_sql for the mam ids,
>setting the node portion to a merkel hash based on previous mam id and
>appended stanza id -- this allows verifying at any point that there is not
>a gap in the history.

While interesting, I feel like this is a layering violation. IDs
shouldn't have any semantics without additional negotiation.
>
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[Stephen Paul Weber]

>>and uses it in mod_storage_internal and mod_storage_sql for the mam ids,
>>setting the node portion to a merkel hash based on previous mam id and
>>appended stanza id -- this allows verifying at any point that there is not
>>a gap in the history.
>
>While interesting, I feel like this is a layering violation. IDs
>shouldn't have any semantics without additional negotiation.

Obviously the clients can't rely on this without some yet-to-be done disco,
but it's a valid way to construct the id either way and means that to enable
such feature becomes easy with discovery.