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Factor out addRoomDeltaToResponse from IncrementalSync (#306)

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Erik Johnston 2017-10-17 17:13:41 +01:00 committed by Richard van der Hoff
parent 7b0f62208f
commit 5a6a950ee8
1 changed files with 50 additions and 35 deletions
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85
src/github.com/matrix-org/dendrite/syncapi/storage/syncserver.go
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@ -229,44 +229,10 @@ func (d *SyncServerDatabase) IncrementalSync(
res := types.NewResponse(toPos)
for _, delta := range deltas {
endPos := toPos
if delta.membershipPos > 0 && delta.membership == "leave" {
// make sure we don't leak recent events after the leave event.
// TODO: History visibility makes this somewhat complex to handle correctly. For example:
// TODO: This doesn't work for join -> leave in a single /sync request (see events prior to join).
// TODO: This will fail on join -> leave -> sensitive msg -> join -> leave
// in a single /sync request
// This is all "okay" assuming history_visibility == "shared" which it is by default.
endPos = delta.membershipPos
}
var recentStreamEvents []streamEvent
recentStreamEvents, err = d.events.selectRecentEvents(
ctx, txn, delta.roomID, fromPos, endPos, numRecentEventsPerRoom,
)
err = d.addRoomDeltaToResponse(ctx, txn, fromPos, toPos, delta, numRecentEventsPerRoom, res)
if err != nil {
return nil, err
}
recentEvents := streamEventsToEvents(recentStreamEvents)
delta.stateEvents = removeDuplicates(delta.stateEvents, recentEvents) // roll back
switch delta.membership {
case "join":
jr := types.NewJoinResponse()
jr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
jr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
jr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
res.Rooms.Join[delta.roomID] = *jr
case "leave":
fallthrough // transitions to leave are the same as ban
case "ban":
// TODO: recentEvents may contain events that this user is not allowed to see because they are
// no longer in the room.
lr := types.NewLeaveResponse()
lr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
lr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
lr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
res.Rooms.Leave[delta.roomID] = *lr
}
}
// TODO: This should be done in getStateDeltas
@ -418,6 +384,55 @@ func (d *SyncServerDatabase) addInvitesToResponse(
return nil
}
// addRoomDeltaToResponse adds a room state delta to a sync response
func (d *SyncServerDatabase) addRoomDeltaToResponse(
ctx context.Context, txn *sql.Tx,
fromPos, toPos types.StreamPosition,
delta stateDelta,
numRecentEventsPerRoom int,
res *types.Response,
) error {
endPos := toPos
if delta.membershipPos > 0 && delta.membership == "leave" {
// make sure we don't leak recent events after the leave event.
// TODO: History visibility makes this somewhat complex to handle correctly. For example:
// TODO: This doesn't work for join -> leave in a single /sync request (see events prior to join).
// TODO: This will fail on join -> leave -> sensitive msg -> join -> leave
// in a single /sync request
// This is all "okay" assuming history_visibility == "shared" which it is by default.
endPos = delta.membershipPos
}
recentStreamEvents, err := d.events.selectRecentEvents(
ctx, txn, delta.roomID, fromPos, endPos, numRecentEventsPerRoom,
)
if err != nil {
return err
}
recentEvents := streamEventsToEvents(recentStreamEvents)
delta.stateEvents = removeDuplicates(delta.stateEvents, recentEvents) // roll back
switch delta.membership {
case "join":
jr := types.NewJoinResponse()
jr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
jr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
jr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
res.Rooms.Join[delta.roomID] = *jr
case "leave":
fallthrough // transitions to leave are the same as ban
case "ban":
// TODO: recentEvents may contain events that this user is not allowed to see because they are
// no longer in the room.
lr := types.NewLeaveResponse()
lr.Timeline.Events = gomatrixserverlib.ToClientEvents(recentEvents, gomatrixserverlib.FormatSync)
lr.Timeline.Limited = false // TODO: if len(events) >= numRecents + 1 and then set limited:true
lr.State.Events = gomatrixserverlib.ToClientEvents(delta.stateEvents, gomatrixserverlib.FormatSync)
res.Rooms.Leave[delta.roomID] = *lr
}
return nil
}
// fetchStateEvents converts the set of event IDs into a set of events. It will fetch any which are missing from the database.
// Returns a map of room ID to list of events.
func (d *SyncServerDatabase) fetchStateEvents(