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Correctly generate backpagination tokens for events which have the same depth (#996)
* 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
GitHub
parent
e15f6676ac
commit
b28674435e
@ -229,14 +229,14 @@ func (r *messagesReq) retrieveEvents() (
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// change the way topological positions are defined (as depth isn't the most
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// reliable way to define it), it would be easier and less troublesome to
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// only have to change it in one place, i.e. the database.
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startPos, err := r.db.EventPositionInTopology(
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startPos, startStreamPos, err := r.db.EventPositionInTopology(
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r.ctx, events[0].EventID(),
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)
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if err != nil {
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err = fmt.Errorf("EventPositionInTopology: for start event %s: %w", events[0].EventID(), err)
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return
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}
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endPos, err := r.db.EventPositionInTopology(
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endPos, endStreamPos, err := r.db.EventPositionInTopology(
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r.ctx, events[len(events)-1].EventID(),
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)
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if err != nil {
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@ -246,10 +246,10 @@ func (r *messagesReq) retrieveEvents() (
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// Generate pagination tokens to send to the client using the positions
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// retrieved previously.
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start = types.NewPaginationTokenFromTypeAndPosition(
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types.PaginationTokenTypeTopology, startPos, 0,
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types.PaginationTokenTypeTopology, startPos, startStreamPos,
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)
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end = types.NewPaginationTokenFromTypeAndPosition(
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types.PaginationTokenTypeTopology, endPos, 0,
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types.PaginationTokenTypeTopology, endPos, endStreamPos,
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)
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if r.backwardOrdering {
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@ -407,13 +407,13 @@ func setToDefault(
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// go 1 earlier than the first event so we correctly fetch the earliest event
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to = types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, 0, 0)
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} else {
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var pos types.StreamPosition
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pos, err = db.MaxTopologicalPosition(ctx, roomID)
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var pos, stream types.StreamPosition
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pos, stream, err = db.MaxTopologicalPosition(ctx, roomID)
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if err != nil {
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return
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}
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to = types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, pos, 0)
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to = types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, pos, stream)
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}
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return
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@ -91,8 +91,8 @@ type Database interface {
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// GetEventsInRange retrieves all of the events on a given ordering using the
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// given extremities and limit.
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GetEventsInRange(ctx context.Context, from, to *types.PaginationToken, roomID string, limit int, backwardOrdering bool) (events []types.StreamEvent, err error)
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// EventPositionInTopology returns the depth of the given event.
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EventPositionInTopology(ctx context.Context, eventID string) (types.StreamPosition, error)
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// EventPositionInTopology returns the depth and stream position of the given event.
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EventPositionInTopology(ctx context.Context, eventID string) (depth types.StreamPosition, stream types.StreamPosition, err error)
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// EventsAtTopologicalPosition returns all of the events matching a given
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// position in the topology of a given room.
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EventsAtTopologicalPosition(ctx context.Context, roomID string, pos types.StreamPosition) ([]types.StreamEvent, error)
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@ -100,7 +100,7 @@ type Database interface {
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// extremities we know of for a given room.
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BackwardExtremitiesForRoom(ctx context.Context, roomID string) (backwardExtremities []string, err error)
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// MaxTopologicalPosition returns the highest topological position for a given room.
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MaxTopologicalPosition(ctx context.Context, roomID string) (types.StreamPosition, error)
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MaxTopologicalPosition(ctx context.Context, roomID string) (depth types.StreamPosition, stream types.StreamPosition, err error)
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// StreamEventsToEvents converts streamEvent to Event. If device is non-nil and
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// matches the streamevent.transactionID device then the transaction ID gets
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// added to the unsigned section of the output event.
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@ -94,6 +94,9 @@ const selectEarlyEventsSQL = "" +
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" WHERE room_id = $1 AND id > $2 AND id <= $3" +
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" ORDER BY id ASC LIMIT $4"
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const selectStreamPositionForEventIDSQL = "" +
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"SELECT id FROM syncapi_output_room_events WHERE event_id = $1"
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const selectMaxEventIDSQL = "" +
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"SELECT MAX(id) FROM syncapi_output_room_events"
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@ -111,13 +114,14 @@ const selectStateInRangeSQL = "" +
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" LIMIT $8"
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type outputRoomEventsStatements struct {
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insertEventStmt *sql.Stmt
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selectEventsStmt *sql.Stmt
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selectMaxEventIDStmt *sql.Stmt
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selectRecentEventsStmt *sql.Stmt
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selectRecentEventsForSyncStmt *sql.Stmt
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selectEarlyEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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insertEventStmt *sql.Stmt
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selectEventsStmt *sql.Stmt
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selectMaxEventIDStmt *sql.Stmt
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selectRecentEventsStmt *sql.Stmt
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selectRecentEventsForSyncStmt *sql.Stmt
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selectEarlyEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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selectStreamPositionForEventIDStmt *sql.Stmt
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}
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func (s *outputRoomEventsStatements) prepare(db *sql.DB) (err error) {
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@ -146,9 +150,18 @@ func (s *outputRoomEventsStatements) prepare(db *sql.DB) (err error) {
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if s.selectStateInRangeStmt, err = db.Prepare(selectStateInRangeSQL); err != nil {
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return
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}
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if s.selectStreamPositionForEventIDStmt, err = db.Prepare(selectStreamPositionForEventIDSQL); err != nil {
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return
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}
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return
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}
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func (s *outputRoomEventsStatements) selectStreamPositionForEventID(ctx context.Context, eventID string) (types.StreamPosition, error) {
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var id int64
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err := s.selectStreamPositionForEventIDStmt.QueryRowContext(ctx, eventID).Scan(&id)
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return types.StreamPosition(id), err
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}
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// selectStateInRange returns the state events between the two given PDU stream positions, exclusive of oldPos, inclusive of newPos.
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// Results are bucketed based on the room ID. If the same state is overwritten multiple times between the
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// two positions, only the most recent state is returned.
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@ -32,35 +32,44 @@ CREATE TABLE IF NOT EXISTS syncapi_output_room_events_topology (
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-- The place of the event in the room's topology. This can usually be determined
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-- from the event's depth.
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topological_position BIGINT NOT NULL,
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stream_position BIGINT NOT NULL,
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-- The 'room_id' key for the event.
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room_id TEXT NOT NULL
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);
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-- The topological order will be used in events selection and ordering
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CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, room_id);
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CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, stream_position, room_id);
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`
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const insertEventInTopologySQL = "" +
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"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id)" +
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" VALUES ($1, $2, $3)" +
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" ON CONFLICT (topological_position, room_id) DO UPDATE SET event_id = $1"
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"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id, stream_position)" +
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" VALUES ($1, $2, $3, $4)" +
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" ON CONFLICT (topological_position, stream_position, room_id) DO UPDATE SET event_id = $1"
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const selectEventIDsInRangeASCSQL = "" +
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
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" ORDER BY topological_position ASC LIMIT $4"
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" WHERE room_id = $1 AND" +
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"(topological_position > $2 AND topological_position < $3) OR" +
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"(topological_position = $4 AND stream_position <= $5)" +
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" ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
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const selectEventIDsInRangeDESCSQL = "" +
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
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" ORDER BY topological_position DESC LIMIT $4"
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" WHERE room_id = $1 AND" +
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"(topological_position > $2 AND topological_position < $3) OR" +
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"(topological_position = $4 AND stream_position <= $5)" +
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" ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
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const selectPositionInTopologySQL = "" +
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"SELECT topological_position FROM syncapi_output_room_events_topology" +
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" WHERE event_id = $1"
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// Select the max topological position for the room, then sort by stream position and take the highest,
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// returning both topological and stream positions.
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const selectMaxPositionInTopologySQL = "" +
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"SELECT MAX(topological_position) FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1"
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"SELECT topological_position, stream_position FROM syncapi_output_room_events_topology" +
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" WHERE topological_position=(" +
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"SELECT MAX(topological_position) FROM syncapi_output_room_events_topology WHERE room_id=$1" +
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") ORDER BY stream_position DESC LIMIT 1"
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const selectEventIDsFromPositionSQL = "" +
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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@ -104,10 +113,10 @@ func (s *outputRoomEventsTopologyStatements) prepare(db *sql.DB) (err error) {
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// insertEventInTopology inserts the given event in the room's topology, based
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// on the event's depth.
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func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
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ctx context.Context, event *gomatrixserverlib.HeaderedEvent,
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ctx context.Context, event *gomatrixserverlib.HeaderedEvent, pos types.StreamPosition,
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) (err error) {
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_, err = s.insertEventInTopologyStmt.ExecContext(
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ctx, event.EventID(), event.Depth(), event.RoomID(),
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ctx, event.EventID(), event.Depth(), event.RoomID(), pos,
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)
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return
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}
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@ -116,7 +125,7 @@ func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
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// given range in a given room's topological order.
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// Returns an empty slice if no events match the given range.
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func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
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ctx context.Context, roomID string, fromPos, toPos types.StreamPosition,
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ctx context.Context, roomID string, fromPos, toPos, toMicroPos types.StreamPosition,
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limit int, chronologicalOrder bool,
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) (eventIDs []string, err error) {
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// Decide on the selection's order according to whether chronological order
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@ -129,7 +138,7 @@ func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
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}
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// Query the event IDs.
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rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
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rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, toPos, toMicroPos, limit)
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if err == sql.ErrNoRows {
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// If no event matched the request, return an empty slice.
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return []string{}, nil
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@ -161,8 +170,8 @@ func (s *outputRoomEventsTopologyStatements) selectPositionInTopology(
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func (s *outputRoomEventsTopologyStatements) selectMaxPositionInTopology(
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ctx context.Context, roomID string,
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) (pos types.StreamPosition, err error) {
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err = s.selectMaxPositionInTopologyStmt.QueryRowContext(ctx, roomID).Scan(&pos)
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) (pos types.StreamPosition, spos types.StreamPosition, err error) {
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err = s.selectMaxPositionInTopologyStmt.QueryRowContext(ctx, roomID).Scan(&pos, &spos)
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return
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}
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@ -159,7 +159,7 @@ func (d *SyncServerDatasource) WriteEvent(
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}
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pduPosition = pos
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if err = d.topology.insertEventInTopology(ctx, ev); err != nil {
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if err = d.topology.insertEventInTopology(ctx, ev, pos); err != nil {
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return err
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}
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@ -240,12 +240,13 @@ func (d *SyncServerDatasource) GetEventsInRange(
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if from.Type == types.PaginationTokenTypeTopology {
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// Determine the backward and forward limit, i.e. the upper and lower
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// limits to the selection in the room's topology, from the direction.
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var backwardLimit, forwardLimit types.StreamPosition
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var backwardLimit, forwardLimit, forwardMicroLimit types.StreamPosition
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if backwardOrdering {
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// Backward ordering is antichronological (latest event to oldest
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// one).
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backwardLimit = to.PDUPosition
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forwardLimit = from.PDUPosition
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forwardMicroLimit = from.EDUTypingPosition
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} else {
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// Forward ordering is chronological (oldest event to latest one).
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backwardLimit = from.PDUPosition
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@ -255,7 +256,7 @@ func (d *SyncServerDatasource) GetEventsInRange(
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// Select the event IDs from the defined range.
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var eIDs []string
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eIDs, err = d.topology.selectEventIDsInRange(
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ctx, roomID, backwardLimit, forwardLimit, limit, !backwardOrdering,
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ctx, roomID, backwardLimit, forwardLimit, forwardMicroLimit, limit, !backwardOrdering,
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)
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if err != nil {
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return
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@ -301,7 +302,7 @@ func (d *SyncServerDatasource) BackwardExtremitiesForRoom(
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func (d *SyncServerDatasource) MaxTopologicalPosition(
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ctx context.Context, roomID string,
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) (types.StreamPosition, error) {
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) (depth types.StreamPosition, stream types.StreamPosition, err error) {
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return d.topology.selectMaxPositionInTopology(ctx, roomID)
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}
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@ -318,8 +319,13 @@ func (d *SyncServerDatasource) EventsAtTopologicalPosition(
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func (d *SyncServerDatasource) EventPositionInTopology(
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ctx context.Context, eventID string,
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) (types.StreamPosition, error) {
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return d.topology.selectPositionInTopology(ctx, eventID)
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) (depth types.StreamPosition, stream types.StreamPosition, err error) {
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depth, err = d.topology.selectPositionInTopology(ctx, eventID)
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if err != nil {
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return
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}
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stream, err = d.events.selectStreamPositionForEventID(ctx, eventID)
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return
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}
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func (d *SyncServerDatasource) SyncStreamPosition(ctx context.Context) (types.StreamPosition, error) {
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@ -74,6 +74,9 @@ const selectEarlyEventsSQL = "" +
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const selectMaxEventIDSQL = "" +
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"SELECT MAX(id) FROM syncapi_output_room_events"
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const selectStreamPositionForEventIDSQL = "" +
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"SELECT id FROM syncapi_output_room_events WHERE event_id = $1"
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// In order for us to apply the state updates correctly, rows need to be ordered in the order they were received (id).
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/*
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$1 = oldPos,
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@ -99,14 +102,15 @@ const selectStateInRangeSQL = "" +
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" LIMIT $8" // limit
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type outputRoomEventsStatements struct {
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streamIDStatements *streamIDStatements
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insertEventStmt *sql.Stmt
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selectEventsStmt *sql.Stmt
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selectMaxEventIDStmt *sql.Stmt
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selectRecentEventsStmt *sql.Stmt
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selectRecentEventsForSyncStmt *sql.Stmt
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selectEarlyEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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streamIDStatements *streamIDStatements
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insertEventStmt *sql.Stmt
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selectEventsStmt *sql.Stmt
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selectMaxEventIDStmt *sql.Stmt
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selectRecentEventsStmt *sql.Stmt
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selectRecentEventsForSyncStmt *sql.Stmt
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selectEarlyEventsStmt *sql.Stmt
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selectStateInRangeStmt *sql.Stmt
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selectStreamPositionForEventIDStmt *sql.Stmt
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}
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func (s *outputRoomEventsStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
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@ -136,9 +140,18 @@ func (s *outputRoomEventsStatements) prepare(db *sql.DB, streamID *streamIDState
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if s.selectStateInRangeStmt, err = db.Prepare(selectStateInRangeSQL); err != nil {
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return
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}
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if s.selectStreamPositionForEventIDStmt, err = db.Prepare(selectStreamPositionForEventIDSQL); err != nil {
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return
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}
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return
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}
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func (s *outputRoomEventsStatements) selectStreamPositionForEventID(ctx context.Context, eventID string) (types.StreamPosition, error) {
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var id int64
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err := s.selectStreamPositionForEventIDStmt.QueryRowContext(ctx, eventID).Scan(&id)
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return types.StreamPosition(id), err
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}
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// selectStateInRange returns the state events between the two given PDU stream positions, exclusive of oldPos, inclusive of newPos.
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// Results are bucketed based on the room ID. If the same state is overwritten multiple times between the
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// two positions, only the most recent state is returned.
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@ -27,37 +27,42 @@ const outputRoomEventsTopologySchema = `
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-- Stores output room events received from the roomserver.
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CREATE TABLE IF NOT EXISTS syncapi_output_room_events_topology (
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event_id TEXT PRIMARY KEY,
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topological_position BIGINT NOT NULL,
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topological_position BIGINT NOT NULL,
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stream_position BIGINT NOT NULL,
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room_id TEXT NOT NULL,
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UNIQUE(topological_position, room_id)
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UNIQUE(topological_position, room_id, stream_position)
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);
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-- The topological order will be used in events selection and ordering
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-- CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, room_id);
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-- CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, stream_position, room_id);
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`
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const insertEventInTopologySQL = "" +
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"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id)" +
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" VALUES ($1, $2, $3)" +
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" ON CONFLICT (topological_position, room_id) DO UPDATE SET event_id = $1"
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"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id, stream_position)" +
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" VALUES ($1, $2, $3, $4)" +
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" ON CONFLICT DO NOTHING"
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const selectEventIDsInRangeASCSQL = "" +
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
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" ORDER BY topological_position ASC LIMIT $4"
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" WHERE room_id = $1 AND" +
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"(topological_position > $2 AND topological_position < $3) OR" +
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"(topological_position = $4 AND stream_position <= $5)" +
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" ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
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const selectEventIDsInRangeDESCSQL = "" +
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
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" ORDER BY topological_position DESC LIMIT $4"
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"SELECT event_id FROM syncapi_output_room_events_topology" +
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" WHERE room_id = $1 AND" +
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"(topological_position > $2 AND topological_position < $3) OR" +
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"(topological_position = $4 AND stream_position <= $5)" +
|
||||
" ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
|
||||
|
||||
const selectPositionInTopologySQL = "" +
|
||||
"SELECT topological_position FROM syncapi_output_room_events_topology" +
|
||||
" WHERE event_id = $1"
|
||||
|
||||
const selectMaxPositionInTopologySQL = "" +
|
||||
"SELECT MAX(topological_position) FROM syncapi_output_room_events_topology" +
|
||||
" WHERE room_id = $1"
|
||||
"SELECT MAX(topological_position), stream_position FROM syncapi_output_room_events_topology" +
|
||||
" WHERE room_id = $1 ORDER BY stream_position DESC"
|
||||
|
||||
const selectEventIDsFromPositionSQL = "" +
|
||||
"SELECT event_id FROM syncapi_output_room_events_topology" +
|
||||
@ -101,11 +106,11 @@ func (s *outputRoomEventsTopologyStatements) prepare(db *sql.DB) (err error) {
|
||||
// insertEventInTopology inserts the given event in the room's topology, based
|
||||
// on the event's depth.
|
||||
func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
|
||||
ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent,
|
||||
ctx context.Context, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent, pos types.StreamPosition,
|
||||
) (err error) {
|
||||
stmt := common.TxStmt(txn, s.insertEventInTopologyStmt)
|
||||
_, err = stmt.ExecContext(
|
||||
ctx, event.EventID(), event.Depth(), event.RoomID(),
|
||||
ctx, event.EventID(), event.Depth(), event.RoomID(), pos,
|
||||
)
|
||||
return
|
||||
}
|
||||
@ -115,7 +120,7 @@ func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
|
||||
// Returns an empty slice if no events match the given range.
|
||||
func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
|
||||
ctx context.Context, txn *sql.Tx, roomID string,
|
||||
fromPos, toPos types.StreamPosition,
|
||||
fromPos, toPos, toMicroPos types.StreamPosition,
|
||||
limit int, chronologicalOrder bool,
|
||||
) (eventIDs []string, err error) {
|
||||
// Decide on the selection's order according to whether chronological order
|
||||
@ -128,7 +133,7 @@ func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
|
||||
}
|
||||
|
||||
// Query the event IDs.
|
||||
rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
|
||||
rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, toPos, toMicroPos, limit)
|
||||
if err == sql.ErrNoRows {
|
||||
// If no event matched the request, return an empty slice.
|
||||
return []string{}, nil
|
||||
@ -160,9 +165,9 @@ func (s *outputRoomEventsTopologyStatements) selectPositionInTopology(
|
||||
|
||||
func (s *outputRoomEventsTopologyStatements) selectMaxPositionInTopology(
|
||||
ctx context.Context, txn *sql.Tx, roomID string,
|
||||
) (pos types.StreamPosition, err error) {
|
||||
) (pos types.StreamPosition, spos types.StreamPosition, err error) {
|
||||
stmt := common.TxStmt(txn, s.selectMaxPositionInTopologyStmt)
|
||||
err = stmt.QueryRowContext(ctx, roomID).Scan(&pos)
|
||||
err = stmt.QueryRowContext(ctx, roomID).Scan(&pos, &spos)
|
||||
return
|
||||
}
|
||||
|
||||
|
||||
@ -194,7 +194,7 @@ func (d *SyncServerDatasource) WriteEvent(
|
||||
}
|
||||
pduPosition = pos
|
||||
|
||||
if err = d.topology.insertEventInTopology(ctx, txn, ev); err != nil {
|
||||
if err = d.topology.insertEventInTopology(ctx, txn, ev, pos); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
@ -281,14 +281,16 @@ func (d *SyncServerDatasource) GetEventsInRange(
|
||||
// events must be retrieved from the rooms' topology table rather than the
|
||||
// table contaning the syncapi server's whole stream of events.
|
||||
if from.Type == types.PaginationTokenTypeTopology {
|
||||
// TODO: ARGH CONFUSING
|
||||
// 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
|
||||
@ -298,7 +300,7 @@ func (d *SyncServerDatasource) GetEventsInRange(
|
||||
// Select the event IDs from the defined range.
|
||||
var eIDs []string
|
||||
eIDs, err = d.topology.selectEventIDsInRange(
|
||||
ctx, nil, roomID, backwardLimit, forwardLimit, limit, !backwardOrdering,
|
||||
ctx, nil, roomID, backwardLimit, forwardLimit, forwardMicroLimit, limit, !backwardOrdering,
|
||||
)
|
||||
if err != nil {
|
||||
return
|
||||
@ -328,8 +330,7 @@ func (d *SyncServerDatasource) GetEventsInRange(
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
return
|
||||
return events, err
|
||||
}
|
||||
|
||||
// SyncPosition returns the latest positions for syncing.
|
||||
@ -353,7 +354,7 @@ func (d *SyncServerDatasource) BackwardExtremitiesForRoom(
|
||||
// room.
|
||||
func (d *SyncServerDatasource) MaxTopologicalPosition(
|
||||
ctx context.Context, roomID string,
|
||||
) (types.StreamPosition, error) {
|
||||
) (types.StreamPosition, types.StreamPosition, error) {
|
||||
return d.topology.selectMaxPositionInTopology(ctx, nil, roomID)
|
||||
}
|
||||
|
||||
@ -372,8 +373,13 @@ func (d *SyncServerDatasource) EventsAtTopologicalPosition(
|
||||
|
||||
func (d *SyncServerDatasource) EventPositionInTopology(
|
||||
ctx context.Context, eventID string,
|
||||
) (types.StreamPosition, error) {
|
||||
return d.topology.selectPositionInTopology(ctx, nil, eventID)
|
||||
) (depth types.StreamPosition, stream types.StreamPosition, err error) {
|
||||
depth, err = d.topology.selectPositionInTopology(ctx, nil, eventID)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
stream, err = d.events.selectStreamPositionForEventID(ctx, eventID)
|
||||
return
|
||||
}
|
||||
|
||||
// SyncStreamPosition returns the latest position in the sync stream. Returns 0 if there are no events yet.
|
||||
|
||||
@ -182,7 +182,7 @@ func TestSyncResponse(t *testing.T) {
|
||||
// limit set to 5
|
||||
return db.CompleteSync(ctx, testUserIDA, 5)
|
||||
},
|
||||
// want the last 5 events, NOT the last 10.
|
||||
// want the last 5 events
|
||||
WantTimeline: events[len(events)-5:],
|
||||
// want all state for the room
|
||||
WantState: state,
|
||||
@ -248,11 +248,11 @@ func TestGetEventsInRangeWithTopologyToken(t *testing.T) {
|
||||
db := MustCreateDatabase(t)
|
||||
events, _ := SimpleRoom(t, testRoomID, testUserIDA, testUserIDB)
|
||||
MustWriteEvents(t, db, events)
|
||||
latest, err := db.MaxTopologicalPosition(ctx, testRoomID)
|
||||
latest, latestStream, err := db.MaxTopologicalPosition(ctx, testRoomID)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get MaxTopologicalPosition: %s", err)
|
||||
}
|
||||
from := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, latest, 0)
|
||||
from := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, latest, latestStream)
|
||||
// head towards the beginning of time
|
||||
to := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, 0, 0)
|
||||
|
||||
@ -265,6 +265,105 @@ func TestGetEventsInRangeWithTopologyToken(t *testing.T) {
|
||||
assertEventsEqual(t, "", true, gots, reversed(events[len(events)-5:]))
|
||||
}
|
||||
|
||||
// The purpose of this test is to make sure that backpagination returns all events, even if some events have the same depth.
|
||||
// For cases where events have the same depth, the streaming token should be used to tie break so events written via WriteEvent
|
||||
// will appear FIRST when going backwards. This test creates a DAG like:
|
||||
// .-----> Message ---.
|
||||
// Create -> Membership --------> Message -------> Message
|
||||
// `-----> Message ---`
|
||||
// depth 1 2 3 4
|
||||
//
|
||||
// With a total depth of 4. It tests that:
|
||||
// - Backpagination over the whole fork should include all messages and not leave any out.
|
||||
// - Backpagination from the middle of the fork should not return duplicates (things later than the token).
|
||||
func TestGetEventsInRangeWithEventsSameDepth(t *testing.T) {
|
||||
t.Parallel()
|
||||
db := MustCreateDatabase(t)
|
||||
|
||||
var events []gomatrixserverlib.HeaderedEvent
|
||||
events = append(events, MustCreateEvent(t, testRoomID, nil, &gomatrixserverlib.EventBuilder{
|
||||
Content: []byte(fmt.Sprintf(`{"room_version":"4","creator":"%s"}`, testUserIDA)),
|
||||
Type: "m.room.create",
|
||||
StateKey: &emptyStateKey,
|
||||
Sender: testUserIDA,
|
||||
Depth: int64(len(events) + 1),
|
||||
}))
|
||||
events = append(events, MustCreateEvent(t, testRoomID, []gomatrixserverlib.HeaderedEvent{events[len(events)-1]}, &gomatrixserverlib.EventBuilder{
|
||||
Content: []byte(fmt.Sprintf(`{"membership":"join"}`)),
|
||||
Type: "m.room.member",
|
||||
StateKey: &testUserIDA,
|
||||
Sender: testUserIDA,
|
||||
Depth: int64(len(events) + 1),
|
||||
}))
|
||||
// fork the dag into three, same prev_events and depth
|
||||
parent := []gomatrixserverlib.HeaderedEvent{events[len(events)-1]}
|
||||
depth := int64(len(events) + 1)
|
||||
for i := 0; i < 3; i++ {
|
||||
events = append(events, MustCreateEvent(t, testRoomID, parent, &gomatrixserverlib.EventBuilder{
|
||||
Content: []byte(fmt.Sprintf(`{"body":"Message A %d"}`, i+1)),
|
||||
Type: "m.room.message",
|
||||
Sender: testUserIDA,
|
||||
Depth: depth,
|
||||
}))
|
||||
}
|
||||
// merge the fork, prev_events are all 3 messages, depth is increased by 1.
|
||||
events = append(events, MustCreateEvent(t, testRoomID, events[len(events)-3:], &gomatrixserverlib.EventBuilder{
|
||||
Content: []byte(fmt.Sprintf(`{"body":"Message merge"}`)),
|
||||
Type: "m.room.message",
|
||||
Sender: testUserIDA,
|
||||
Depth: depth + 1,
|
||||
}))
|
||||
MustWriteEvents(t, db, events)
|
||||
latestPos, latestStreamPos, err := db.EventPositionInTopology(ctx, events[len(events)-1].EventID())
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get EventPositionInTopology: %s", err)
|
||||
}
|
||||
topoPos, streamPos, err := db.EventPositionInTopology(ctx, events[len(events)-3].EventID()) // Message 2
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get EventPositionInTopology for event: %s", err)
|
||||
}
|
||||
fromLatest := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, latestPos, latestStreamPos)
|
||||
fromFork := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, topoPos, streamPos)
|
||||
// head towards the beginning of time
|
||||
to := types.NewPaginationTokenFromTypeAndPosition(types.PaginationTokenTypeTopology, 0, 0)
|
||||
|
||||
testCases := []struct {
|
||||
Name string
|
||||
From *types.PaginationToken
|
||||
Limit int
|
||||
Wants []gomatrixserverlib.HeaderedEvent
|
||||
}{
|
||||
{
|
||||
Name: "Pagination over the whole fork",
|
||||
From: fromLatest,
|
||||
Limit: 5,
|
||||
Wants: reversed(events[len(events)-5:]),
|
||||
},
|
||||
{
|
||||
Name: "Paginating to the middle of the fork",
|
||||
From: fromLatest,
|
||||
Limit: 2,
|
||||
Wants: reversed(events[len(events)-2:]),
|
||||
},
|
||||
{
|
||||
Name: "Pagination FROM the middle of the fork",
|
||||
From: fromFork,
|
||||
Limit: 3,
|
||||
Wants: reversed(events[len(events)-5 : len(events)-2]),
|
||||
},
|
||||
}
|
||||
|
||||
for _, tc := range testCases {
|
||||
// backpaginate messages starting at the latest position.
|
||||
paginatedEvents, err := db.GetEventsInRange(ctx, tc.From, to, testRoomID, tc.Limit, true)
|
||||
if err != nil {
|
||||
t.Fatalf("%s GetEventsInRange returned an error: %s", tc.Name, err)
|
||||
}
|
||||
gots := gomatrixserverlib.HeaderedToClientEvents(db.StreamEventsToEvents(&testUserDeviceA, paginatedEvents), gomatrixserverlib.FormatAll)
|
||||
assertEventsEqual(t, tc.Name, true, gots, tc.Wants)
|
||||
}
|
||||
}
|
||||
|
||||
func assertEventsEqual(t *testing.T, msg string, checkRoomID bool, gots []gomatrixserverlib.ClientEvent, wants []gomatrixserverlib.HeaderedEvent) {
|
||||
if len(gots) != len(wants) {
|
||||
t.Fatalf("%s response returned %d events, want %d", msg, len(gots), len(wants))
|
||||
@ -294,7 +393,8 @@ func assertEventsEqual(t *testing.T, msg string, checkRoomID bool, gots []gomatr
|
||||
t.Errorf("%s event[%d] unsigned mismatch: got %s want %s", msg, i, string(g.Unsigned), string(w.Unsigned()))
|
||||
}
|
||||
if (g.StateKey == nil && w.StateKey() != nil) || (g.StateKey != nil && w.StateKey() == nil) {
|
||||
t.Fatalf("%s event[%d] state_key [not] missing: got %v want %v", msg, i, g.StateKey, w.StateKey())
|
||||
t.Errorf("%s event[%d] state_key [not] missing: got %v want %v", msg, i, g.StateKey, w.StateKey())
|
||||
continue
|
||||
}
|
||||
if g.StateKey != nil {
|
||||
if !w.StateKeyEquals(*g.StateKey) {
|
||||
|
||||
@ -64,8 +64,14 @@ const (
|
||||
// /sync or /messages, for example.
|
||||
type PaginationToken struct {
|
||||
//Position StreamPosition
|
||||
Type PaginationTokenType
|
||||
PDUPosition StreamPosition
|
||||
Type PaginationTokenType
|
||||
// For /sync, this is the PDU position. For /messages, this is the topological position (depth).
|
||||
// TODO: Given how different the positions are depending on the token type, they should probably be renamed
|
||||
// or use different structs altogether.
|
||||
PDUPosition StreamPosition
|
||||
// For /sync, this is the EDU position. For /messages, this is the stream (PDU) position.
|
||||
// TODO: Given how different the positions are depending on the token type, they should probably be renamed
|
||||
// or use different structs altogether.
|
||||
EDUTypingPosition StreamPosition
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user