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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
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Kegsay 2020-05-01 11:01:34 +01:00 • committed by GitHub
parent e15f6676ac
commit b28674435e
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10 changed files with 238 additions and 80 deletions
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6
syncapi/storage/interface.go
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@ -91,8 +91,8 @@ type Database interface {
// GetEventsInRange retrieves all of the events on a given ordering using the
// given extremities and limit.
GetEventsInRange(ctx context.Context, from, to *types.PaginationToken, roomID string, limit int, backwardOrdering bool) (events []types.StreamEvent, err error)
// EventPositionInTopology returns the depth of the given event.
EventPositionInTopology(ctx context.Context, eventID string) (types.StreamPosition, error)
// EventPositionInTopology returns the depth and stream position of the given event.
EventPositionInTopology(ctx context.Context, eventID string) (depth types.StreamPosition, stream types.StreamPosition, err error)
// EventsAtTopologicalPosition returns all of the events matching a given
// position in the topology of a given room.
EventsAtTopologicalPosition(ctx context.Context, roomID string, pos types.StreamPosition) ([]types.StreamEvent, error)
@ -100,7 +100,7 @@ type Database interface {
// extremities we know of for a given room.
BackwardExtremitiesForRoom(ctx context.Context, roomID string) (backwardExtremities []string, err error)
// MaxTopologicalPosition returns the highest topological position for a given room.
MaxTopologicalPosition(ctx context.Context, roomID string) (types.StreamPosition, error)
MaxTopologicalPosition(ctx context.Context, roomID string) (depth types.StreamPosition, stream types.StreamPosition, err error)
// StreamEventsToEvents converts streamEvent to Event. If device is non-nil and
// matches the streamevent.transactionID device then the transaction ID gets
// added to the unsigned section of the output event.