[Galene] Re: Heads up: protocol changes for Galene 0.5

[Klanjabrik - <klanjabrik@gmail.com>]

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Thanks for the update.

On Sun, Jan 30, 2022, 05:42 Juliusz Chroboczek <jch@irif.fr> wrote:

> Some minor protocol changes.  Rationale at the end.
>
> 1. What was previously known as "user.status" is now known as "user.data".
>    The userAction "setstatus" is now known as "setdata".
>
> We now consistently distuinguish between "status", which is maintained by
> the server, and "data", which is controlled by the client.
>
>
> 2. The "user.data" may be set at the time of joining a group.
>
> Previously, one needed to join a group and then set "user.data".  It is
> now possible to set "user.data" at the time of joining, which avoids the
> need to debounce "user" messages.
>
>
> 3. We now implement "group.data" in addition to "user.data" and
> "group.status".
>
> Group.data may be set by any group operator, and is propagated to all
> clients in a group by the means of "joined" messages.  If you're using
> protocol.js, it's a parameter of the "onjoined" callback.
>
>
> # Rationale
>
> Anabole.com have been forking Galene for remote teaching of primary school
> students.  My goal with these changes is to ensure that they only modify
> the client, and that they don't need to make any changes to the server.
>
> In their user interface, they store a user avatar's position in the
> "user.data" field; if the "user.data" field cannot be set at joining time,
> the other clients receive two "user" notifications, which leads to display
> flicke.r
>
> Another feature is to allow the teacher to set the current exercice
> number, and have it prominently displayed for all students.  This is
> currently done using ad-hoc userMessages, which is racy; the goal is to
> store it in "group.data".
>
> -- Juliusz
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