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Update /messages pagination token behaviour (#1708)

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* Tweak pagination tokens

* start should be the specified from

* Don't reverse start and end

* Tweak getStartEnd again

* Update sytest-whitelist

* NOTSPEC: Re-add iOS end of topology
This commit is contained in:
Neil Alexander 2021-01-13 12:59:29 +00:00 committed by GitHub
parent fa65c40bae
commit 55cfe391f7
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 30 additions and 29 deletions
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57
syncapi/routing/messages.go
View file

@ -273,6 +273,14 @@ func (r *messagesReq) retrieveEvents() (
return []gomatrixserverlib.ClientEvent{}, *r.from, *r.to, nil
}
// Get the position of the first and the last event in the room's topology.
// This position is currently determined by the event's depth, so we could
// also use it instead of retrieving from the database. However, if we ever
// change the way topological positions are defined (as depth isn't the most
// reliable way to define it), it would be easier and less troublesome to
// only have to change it in one place, i.e. the database.
start, end, err = r.getStartEnd(events)
// Sort the events to ensure we send them in the right order.
if r.backwardOrdering {
// This reverses the array from old->new to new->old
@ -292,14 +300,6 @@ func (r *messagesReq) retrieveEvents() (
// Convert all of the events into client events.
clientEvents = gomatrixserverlib.HeaderedToClientEvents(events, gomatrixserverlib.FormatAll)
// Get the position of the first and the last event in the room's topology.
// This position is currently determined by the event's depth, so we could
// also use it instead of retrieving from the database. However, if we ever
// change the way topological positions are defined (as depth isn't the most
// reliable way to define it), it would be easier and less troublesome to
// only have to change it in one place, i.e. the database.
start, end, err = r.getStartEnd(events)
return clientEvents, start, end, err
}
@ -363,7 +363,7 @@ func (r *messagesReq) filterHistoryVisible(events []*gomatrixserverlib.HeaderedE
return events // apply no filtering as it defaults to Shared.
}
hisVis, _ := hisVisEvent.HistoryVisibility()
if hisVis == "shared" {
if hisVis == "shared" || hisVis == "world_readable" {
return events // apply no filtering
}
if membershipEvent == nil {
@ -388,26 +388,16 @@ func (r *messagesReq) filterHistoryVisible(events []*gomatrixserverlib.HeaderedE
}
func (r *messagesReq) getStartEnd(events []*gomatrixserverlib.HeaderedEvent) (start, end types.TopologyToken, err error) {
start, err = r.db.EventPositionInTopology(
r.ctx, events[0].EventID(),
)
if err != nil {
err = fmt.Errorf("EventPositionInTopology: for start event %s: %w", events[0].EventID(), err)
return
}
if r.backwardOrdering && events[len(events)-1].Type() == gomatrixserverlib.MRoomCreate {
// We've hit the beginning of the room so there's really nowhere else
// to go. This seems to fix Riot iOS from looping on /messages endlessly.
end = types.TopologyToken{}
} else {
end, err = r.db.EventPositionInTopology(
r.ctx, events[len(events)-1].EventID(),
)
if err != nil {
err = fmt.Errorf("EventPositionInTopology: for end event %s: %w", events[len(events)-1].EventID(), err)
return
}
if r.backwardOrdering {
if r.backwardOrdering {
start = *r.from
if events[len(events)-1].Type() == gomatrixserverlib.MRoomCreate {
// NOTSPEC: We've hit the beginning of the room so there's really nowhere
// else to go. This seems to fix Riot iOS from looping on /messages endlessly.
end = types.TopologyToken{}
} else {
end, err = r.db.EventPositionInTopology(
r.ctx, events[0].EventID(),
)
// A stream/topological position is a cursor located between two events.
// While they are identified in the code by the event on their right (if
// we consider a left to right chronological order), tokens need to refer
@ -415,6 +405,15 @@ func (r *messagesReq) getStartEnd(events []*gomatrixserverlib.HeaderedEvent) (st
// end position we send in the response if we're going backward.
end.Decrement()
}
} else {
start = *r.from
end, err = r.db.EventPositionInTopology(
r.ctx, events[len(events)-1].EventID(),
)
}
if err != nil {
err = fmt.Errorf("EventPositionInTopology: for end event %s: %w", events[len(events)-1].EventID(), err)
return
}
return
}

2
sytest-whitelist
View file

@ -501,3 +501,5 @@ Can forget room you've been kicked from
/joined_members return joined members
A next_batch token can be used in the v1 messages API
Users receive device_list updates for their own devices
m.room.history_visibility == "world_readable" allows/forbids appropriately for Guest users
m.room.history_visibility == "world_readable" allows/forbids appropriately for Real users