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matrix-spec-proposals/drafts/data_flows.rst

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Data flows for use cases
========================
::
<- Data from server to client
-> Data from client to server
Instant Messaging
-----------------
Without storage
~~~~~~~~~~~~~~~
::
Home screen
Data required on load:
<- For each room the user is joined: Name, topic, # members, last message, room ID, aliases
Data required when new message arrives for a room:
<- Room ID, message content, sender (user ID, display name, avatar url)
Data required when someone invites you to a room:
<- Room ID, sender (user ID, display name, avatar url), Room Name, Room Topic
Data required when you leave a room on another device:
<- Room ID
Data required when you join a room on another device:
<- Name, topic, # members, last message, room ID, aliases
Data required when your profile info changes on another device:
<- new profile info e.g. avatar, display name, etc.
Creating a room
-> Invitee list of user IDs, public/private, name of room, alias of room, topic of room
<- Room ID
Joining a room (and dumped into chat screen on success)
-> Room ID / Room alias
<- Room ID, Room aliases (plural), Name, topic, member list (f.e. member: user ID,
avatar, presence, display name, power level, whether they are typing), enough
messages to fill screen (and whether there are more)
Chat Screen
Data required when member name changes:
<- new name, room ID, user ID, when in the context of the room did this occur
Data required when the room name changes:
<- new name, room ID, old room name?
Invite a user:
-> user ID, room ID
<- display name / avatar of user invited (if known)
Kick a user:
-> user ID, room ID
<- what message it came after
Leave a room:
-> room ID
<- what message it came after
Send a message
-> Message content, room ID, message sequencing (eg sending my 1st, 2nd, 3rd msg)
<- actual content sent (if server mods it), what message it comes after (to correctly
display the local echo)
Place a call (receive a call is just reverse)
<- turn servers
-> SDP offer
-> Ice candidates (1 by 1; trickling)
<- SDP answer
<- Ice candidates
Scrolling back (infinite scrolling)
-> Identifier for the earliest message, # requested messages
<- requested messages (f.e change in display name, what the old name was), whether
there are more.
With storage
~~~~~~~~~~~~
::
Home Screen
On Load
-> Identifier which tells the server the client's current state (which rooms it is aware
of, which messages it has, what display names for users, etc..)
<- A delta from the client's current state to the current state on the server (e.g. the
new rooms, the *latest* message if different, the changed display names, the new
invites, etc). f.e Room: Whether the cache of the room that you have has been replaced
with this new state.
Pre-load optimisation (not essential for this screen)
-> Number of desired messages f.e room to cache
<- f.e Room: the delta OR the entire state
Bug Tracking
------------
::
Landing Page
On Load
<- Issues assigned to me, Issues I'm watching, Recent activity on other issues includes
comments, list of projects
Search for an issue (assume text)
-> Search string
<- List of paginated issues
Request page 2:
-> Page number requested
<- Page of paginated issues
Issue Page
On Load
-> Issue ID and Project ID (equiv to Room)
<- Issue contents e.g. priority, resolution state, etc. All comments e.g. user ID,
comment text, timestamp. Entire issue history e.g. changes in priority
Post a comment
-> Issue ID, comment content, Project ID (equiv to Room)
<- actual content sent (if modded), what comment it comes after
Set issue priority
-> Issue ID, Project ID, desired priority
<- What action in the history it came after
Someone else sets issue priority
<- Issue ID, Project ID, new priority, where in the history
10 years ago
Mapping model use cases to matrix models (Room, Message, etc)
=============================================================
To think about:
- Do we want to support the idea of forking off new rooms from existing ones? This
and forums could benefit from it.
Bug tracking UI
---------------
::
Projects => Rooms
Issues => Message Events
Comments => Message Events (relates_to key)
Projects:
- Unlikely that there will be 100,000s of issues, so having to pull in all the issues for a project is okay.
- Permissions are usually per project and this Just Works.
- New issues come in automatically and Just Work.
- Can have read-only members
Issues:
- Don't really want 1 Room per Issue, else you can have thousands of Rooms PER PROJECT, hence choice for
Issues as Messages. Don't need to join a room for each issue.
- Idea of issue owner is clear (sender of the message)
- Updating issues requires an additional event similar to comments (with ``relates_to``)? Could possibly
be state events? Don't really want all the history if say the priority was changed 1000 times, just want
the current state of the key.
Comments:
- Additional event with ``relates_to`` key.
Forum
-----
::
Forum => Room (with pointers to Board Rooms)
Boards => Room (with pointers to Thread Rooms)
Threads => Room
Messages => Message Events
Forum:
- Contains 10s of Boards.
- Contains special Message Events which point to different rooms f.e Board.
Boards:
- Contains 100s of Threads.
- Contains special Message Events which point to different rooms f.e. Thread.
Threads:
- Contains 100s of Messages.
Can't do this nicely with the current Federation API because you have loads of
Rooms and what does posting a message look like? Creating a thread is done by..?
The user who is posting cannot create the thread because otherwise they would be
the room creator and have ultimate privileges. So it has to be created by a bot
of some kind which ties into auth (Application services?). To follow a board,
you need a bot to join the Board Room and then watch it for changes...
Fundamental problem with forums is that there is only 1 PDU graph per room and
you either have to pull in lots of graphs separately or one graph and filter it
separately to get to the desired sub set of data. You have to subscribe into a
lot of graphs if you subscribe to a board... If you have the entire board...
good luck scrollbacking a particular thread.
Google+ Community
-----------------
::
Community => Room (with pointers to Category Rooms)
Category => Room
Post => Message Events
Comment => Message Events (relates_to key)
Community:
- Contains 10s of categories.
- Contains special Message Events which point to different rooms f.e Category.
- Moderators of the community are mods in this room. They are in charge of making
new categories and the subsequent rooms. Can get a bit funky if a mod creates a
category room without the same permissions as the community room... but another
mod can always delete the pointer to the buggy category room and make a new one.
- Do we want to support the idea of forking off new rooms from existing ones? This
and forums could benefit from it.
Category:
- Contains 1000s of posts.
- Same permissions as the community room. How to enforce? Fork off the community
room?
Posts:
- Contains 10s of comments.
This is similar to forums but you can more reasonably say "screw it, pull in the
entire community of posts."