From 256ad01fd231945be01e1d2e18fb597e2780c595 Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <richard@matrix.org>
Date: Fri, 10 Aug 2018 16:51:44 +0100
Subject: [PATCH] proposal for room version upgrades

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diff --git a/proposals/1501-room-version-upgrades.md b/proposals/1501-room-version-upgrades.md
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+# Room version upgrades
+
+## Background
+
+[MSC1425](https://github.com/matrix-org/matrix-doc/issues/1425) introduces a
+mechanism for associating a "version" with a room, which allows us to introduce
+changes to the mechanics of rooms.
+
+Assuming that a given change is successful, the next challenge is to introduce
+it to existing rooms. This proposal introduces a mechanism for doing so.
+
+## Proposal
+
+In short: room upgrades are implemented by creating a new room, shutting down
+the old one, and linking between the two.
+
+The mechanics of this are as follows. When Alice upgrades a room, her client
+hits a new C-S api:
+
+```
+POST /_matrix/client/r0/room/{roomId}/upgrade
+```
+```json
+{
+    "new_version": "2"
+}
+```
+
+Response:
+
+```json
+{
+    "replacement_room": "!QtykxKocfsgujksjgd:matrix.org"
+}
+```
+
+When this is called, the server:
+
+ * Checks that Alice has permissions to send `m.room.tombstone` state events.
+
+ * Creates a replacement room, with an `m.room.create` with a `predecessor` field
+   which links to the last known event in the old room:
+
+   ```json
+   {
+       "sender": "@alice:somewhere.com",
+       "type": "m.room.create",
+       "state_key": "",
+       "room_id": "!QtykxKocfsgujksjgd:matrix.org",
+       "content": {
+           "predecessor": {
+               "room_id": "!cURbaf:matrix.org",
+               "event_id": "$1235135aksjgdkg:matrix.org"
+           }
+       }
+   }
+   ```
+
+ * Replicates PL/privacy/topic/etc settings to the new room.
+
+ * Moves any local aliases to the new room.
+
+ * Sends an `m.room.tombstone` state event in the old room to tell participants
+   that it is dead:
+
+   ```json
+   {
+       "sender": "@alice:somewhere.com",
+       "type": "m.room.tombstone",
+       "state_key": "",
+       "room_id": "!cURbaf:matrix.org",
+       "content": {
+           "body": "This room has been replaced",
+           "replacement_room": "!QtykxKocfsgujksjgd:matrix.org"
+       }
+   }
+   ```
+
+ * Assuming Alice has the powers to do so, sets the power levels in the old
+   room to stop people speaking. [TODO: what does this actually mean?]
+
+Bob's client understands the `m.room.tombstone` event, and:
+
+ * Hides the old room in the room list (the room continues to be accessible
+   via the old room id (permalinks, backlinks from the new room, etc).
+
+ * Displays, at the very bottom of the timeline of the old room: "This room
+   has been upgraded. Click here to follow the conversation to the new room".
+   The link is simply a permalink to the new room. When Bob opens it, he will
+   get joined to the new room.
+
+   [Note that if Bob is on a version of synapse which doesn't understand room
+   versions, following the permalink will take him to a room view which churns
+   for a while and eventually fails. Synapse 0.33.3 / 0.34.0 should at least
+   give a sensible error code.]
+
+ * Optional extension: if the user is in both rooms, then the "N unread
+   messages" banner when scrolled up in the old room could be made to track
+   messages in the new room (so in practice the user would only ever see the
+   hiatus between the versions if they scrolled all the way to the beginning
+   of the new room or the end of the old one.)
+
+Bob's client also understands the `predecessor` field in the `m.room.create`, and:
+
+ * At the top of scrollback in the new room, displays: "This room is a
+   continuation of a previous room. Click here to see the old conversation."
+   The link is a permalink to the old room.
+
+ * Optional extensions might include things like extending room search to
+   work across two rooms.
+
+### Summary: client changes needed
+
+ * Ability for an op to view the current room version and upgrade it (by
+   hitting `/upgrade_room`).
+
+   * Also the ability for an op to see what versions the servers in the current
+     room supports (nb via a cap API) and so how many users will get locked out
+     [XXX: really? this sounds like a pita]
+
+ * Display `m.room.tombstone`s as a sticky message at the bottom of the old
+   room (perhaps replacing the message composer input) as “This room has been
+   replaced. Please click here to continue” or similar.
+
+   * When the user clicks the link, the client attempts to join the new room if
+     we are not already a member, and then switches to a view on the new room.
+
+ * If the client sees a pair of rooms with a tombstone correctly joined to the
+   new room, it should hide the old one from the RoomList.
+
+ * If one backpaginates the new room to its creation, we should show the
+   `m.room.create` as “This room is a continuation of a previous room; click here
+   to view” (or similar).
+
+ * Search is extended to search old rooms (could be done clientside for now).
+
+Future eye-candy:
+
+ * When one is viewing the old room:
+
+   * Rather than showing a sticky tombstone at the bottom, one should probably
+     have the “10 unread messages” section in the status bar which refers to
+     the current version of the room.
+
+   * We should probably also show the membership list of the current room. (Perhaps?)
+
+### Problems
+
+ * If Bob is on a remote server, how does it know where to send the
+   `/make_join` for the new room?
+
+   * We could send it to the server which sent the `tombstone` evnent? (This
+     would require the client to set the `server_name` param on the `/join`
+     request, but that seems fine)
+
+ * What about invite-only rooms? Users in the old room won't be able to join
+   the new room without an invite.
+
+   * For local users, we need to first create an invite for each user in the
+     room. This is easy, if a bit high-overhead.
+
+   * For remote users:
+
+     * Alice's server could send invites; however this is likely to give an
+       unsatisfactory UX due to servers being offline, maybe not supporting the
+       new room version, and then spamming Bob with mysterious invites.
+
+     * We could change the auth rules to treat a membership of the old room as
+       equivalent to an invite to the new room. However, this is likely to
+       reintroduce the problems we are trying to solve by replacing the room in
+       the first place.
+
+     * We could create a new type of membership which acts like an invite for
+       the purposes of allowing users into invite-only rooms, but doesn't need
+       to be sent to remote servers.
+
+ * What about clients that don't understand tombstones?
+
+   * I think they'll just show you two separate rooms (both with the same
+     name), and you won't be able to talk in one of them. It's not great but it
+     will probably do.
+
+ * It's a shame that scrollback in the new room will show a load of joins
+   before you get to the link to the old room.
+
+ * Do users stay members of the old room forever? Do they leave after a
+   respectful period? Do they leave if the user leaves the new room?
+
+## Dismissed solutions
+
+### Variations on this proposal
+
+#### Have servers auto-join their users on upgrade
+
+In order to make the upgrade more seamless, it might be good for servers to
+automatically join any users that were in the old room to the new room.
+
+In short, when Bob's server receives a tombstone event, it would attempt to
+auto-join Bob to the new room, and updates any aliases it may have to point to
+the new room.
+
+It's worth noting that the join may not be successful: for example, because
+Bob's server is too old, or because Bob has been blocked from joining the new
+room, or because joins are generally flaky. In this case Bob might attempt a
+rejoin via his client.
+
+#### Have servers merge old and new rooms together
+
+Instead of expecting clients to interpret tombstone events, servers could merge
+/sync results together for the two rooms and present both as the old room in
+/sync results - and then map from the old room ID back to the new one for API
+calls.
+
+(Note that doing this the other way around (mapping both rooms into the *new*
+room ID) doesn't really work without massively confusing clients which have
+cached data about the old room.)
+
+This sounds pretty confusing though: would the server do this forever
+for all users on the server?
+
+#### have clients merge old and new rooms
+
+At the top of scrollback for the new room, shows some sort of "messages from a
+previous version of this room" divider, above which it shows messages from the
+old room <sup name="a10">[1](#f10)</sup>.
+
+This gets quite messy quite quickly. For instance, it will be confusing to see
+any ongoing traffic in the old room (people whose servers didn't get the memo
+about the tombstone; people leaving the old room; etc). Ultimately it's all
+client polish though, so we can consider this for the future.
+
+<b name="f10">1</b> It's probably worth noting that this alone is a somewhat
+fundamental reworking of a bunch of complicated stuff in matrix-react-sdk (and
+presumably likewise in the mobile clients). [↩](#a10)
+
+### Counter-proposal: upgrade existing rooms in-place
+
+The general idea here is to divide the room DAG into v1 and v2 parts. Servers
+which do not support v2 will not see the v2 part of the DAG. This might look
+like the below:
+
+![dag](1501-split-dag.png)
+
+In this model, room version is tracked as a state event:
+
+```json
+{
+    "type": "m.room.version",
+    "content": {
+        "version": 2
+    }
+}
+```
+
+This event can only ever be sent by the **original room creator** - i.e., the
+sender of the `m.room.create event` - even if the `m.room.power_levels` say
+otherwise <sup name="a1">[1](#f1)</sup> <sup name="a2">[2](#f2)</sup>.
+
+The DAG is now divided into parts where the state of m.room.version is 2, and
+those where it is missing (and therefore implicitly 1).
+
+When sending out federation transactions, v2 events are listed under a new
+versioned_pdus key in the /send request:
+
+```
+PUT /_matrix/federation/v1/send/991079979
+
+{
+ "origin_server_ts": 1404835423000,
+ "origin": "matrix.org",
+ "pdus": [],
+ "versioned_pdus": {
+   2: [...]
+ },
+ "edus": [...]
+}
+```
+
+Old servers which do not support v2 will therefore not receive any v2 parts of
+the DAG, and transactions which only contain updates to the v2 part of the DAG
+will be treated as no-ops. Servers should ignore entries under versioned_pdus
+which correspond to versions they do not know about.
+
+As a special case, `m.room_version events` themselves are treated as having the
+version previously in force in the room, unless that was v1, in which case,
+they are treated as being v2. This means that the upgrade from v1 to v2, *and*
+the upgrade from v2 to v3, are included under `versioned_pdus[2]`, but the
+upgrade from v3 to v4 is included under `versioned_pdus[3]`. If a server
+receives an `m.room_version` event with a version it does not understand, it
+must refuse to allow any other events into the upgraded part of the DAG (and
+probably *should* refuse to allow any events into the DAG at all)
+<sup name="a1">[3](#f3)</sup>. The reasons for this are as follows:
+
+ * We want to ensure that v1-only servers do not receive the room_version
+   event, since they don't know how to auth it correctly, and more importantly
+   we want to ensure that they can't get hold of it to construct bits of DAG
+   which refer to it, and would have to follow the v2 rules.
+
+ * However, putting subsequent upgrades in a place where older servers will see
+   it means that we can do more graceful upgrades in future by telling their
+   clients that the room seems to have been upgraded.
+
+As normal, we require joining servers to declare their support for room
+versions, and reject any which do not include the version of the room given by
+the current room state.
+
+In theory this is all that is required to ensure that v1-only servers never see
+any v2 parts of the DAG (events are only sent via /send, and a v1 server should
+have no way to reference v2 parts of the DAG); however we may want to consider
+adding a "versions" parameter to API calls like /event and /state which allow a
+server to specify an event_id to fill from, in case a (non-synapse, presumably)
+implementation gets an event id from a /context request or similar and tries to
+fill from it.
+
+The experience for clients could be improved by awareness of the m.room.version
+event and querying a capabilities API (e.g. /versions?) to determine whether a
+room has been upgraded newer than the server can support.  If so, a client
+could say: “Your server must be upgraded to continue to participate in this
+room” (and manually prevent the user from trying to speak).
+
+#### Problems
+
+ * This leaves users on old v1-only servers in their own view of the room,
+   potentially continuing to speak but only seeing a subset of events (those
+   from their own and other v1 servers).
+
+   In the worst case, they might ask questions which those on v2 servers can see but have no way of replying to.
+
+   One way to mitigate this would be to ensure that the last event sent in the
+   v1 part of the DAG is an m.room.power_levels to make the room read-only to
+   casual users; then restore the situation in the v2 DAG.
+
+ * There's nothing to stop "inquisitive" users on v1 servers sending
+   m.room.version events, which is likely to completely split-brain the room.
+
+ * This doesn't help us do things like change the format of the room id.
+
+<b name="f1">1</b> This avoids the version event itself being vulnerable to state
+resets. [↩](#a1)
+
+<b name="f2">2</b> This is therefore a change to the event authorisation rules
+which we need to introduce with room version 2. [↩](#a2)
+
+<b name="f3">3</b> It's worth noting this does give the room creator a
+kill-switch for the room, even if they've subsequently been de-opped. Such is
+life. [↩](#a3)
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