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Correctly generate backpagination tokens for events which have the same depth (#996)

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* Correctly generate backpagination tokens for events which have the same depth

With tests. Unfortunately the code around here is hard to understand.
There will be a subsequent PR which fixes this up now that we have a test
harness in place.

* Add postgres impl

* More linting

* Fix psql statement so it actually works
This commit is contained in:
Kegsay 2020-05-01 11:01:34 +01:00 • committed by GitHub
parent e15f6676ac
commit b28674435e
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 238 additions and 80 deletions
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18
syncapi/storage/postgres/syncserver.go
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@ -159,7 +159,7 @@ func (d *SyncServerDatasource) WriteEvent(
}
pduPosition = pos
if err = d.topology.insertEventInTopology(ctx, ev); err != nil {
if err = d.topology.insertEventInTopology(ctx, ev, pos); err != nil {
return err
}
@ -240,12 +240,13 @@ func (d *SyncServerDatasource) GetEventsInRange(
if from.Type == types.PaginationTokenTypeTopology {
// Determine the backward and forward limit, i.e. the upper and lower
// limits to the selection in the room's topology, from the direction.
var backwardLimit, forwardLimit types.StreamPosition
var backwardLimit, forwardLimit, forwardMicroLimit types.StreamPosition
if backwardOrdering {
// Backward ordering is antichronological (latest event to oldest
// one).
backwardLimit = to.PDUPosition
forwardLimit = from.PDUPosition
forwardMicroLimit = from.EDUTypingPosition
} else {
// Forward ordering is chronological (oldest event to latest one).
backwardLimit = from.PDUPosition
@ -255,7 +256,7 @@ func (d *SyncServerDatasource) GetEventsInRange(
// Select the event IDs from the defined range.
var eIDs []string
eIDs, err = d.topology.selectEventIDsInRange(
ctx, roomID, backwardLimit, forwardLimit, limit, !backwardOrdering,
ctx, roomID, backwardLimit, forwardLimit, forwardMicroLimit, limit, !backwardOrdering,
)
if err != nil {
return
@ -301,7 +302,7 @@ func (d *SyncServerDatasource) BackwardExtremitiesForRoom(
func (d *SyncServerDatasource) MaxTopologicalPosition(
ctx context.Context, roomID string,
) (types.StreamPosition, error) {
) (depth types.StreamPosition, stream types.StreamPosition, err error) {
return d.topology.selectMaxPositionInTopology(ctx, roomID)
}
@ -318,8 +319,13 @@ func (d *SyncServerDatasource) EventsAtTopologicalPosition(
func (d *SyncServerDatasource) EventPositionInTopology(
ctx context.Context, eventID string,
) (types.StreamPosition, error) {
return d.topology.selectPositionInTopology(ctx, eventID)
) (depth types.StreamPosition, stream types.StreamPosition, err error) {
depth, err = d.topology.selectPositionInTopology(ctx, eventID)
if err != nil {
return
}
stream, err = d.events.selectStreamPositionForEventID(ctx, eventID)
return
}
func (d *SyncServerDatasource) SyncStreamPosition(ctx context.Context) (types.StreamPosition, error) {