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Limit the number of events returned by the database query when using topological tokens

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This commit is contained in:
Brendan Abolivier 2018-12-11 11:35:01 +00:00
parent b028a31f7f
commit f600d520de
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GPG key ID: 8EF1500759F70623
2 changed files with 5 additions and 5 deletions
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8
src/github.com/matrix-org/dendrite/syncapi/storage/output_room_events_topology_table.go
View file

@ -44,12 +44,12 @@ const insertEventInTopologySQL = "" +
const selectEventIDsInRangeASCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
" ORDER BY topological_position ASC"
" ORDER BY topological_position ASC LIMIT $4"
const selectEventIDsInRangeDESCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND topological_position > $2 AND topological_position <= $3" +
" ORDER BY topological_position DESC"
" ORDER BY topological_position DESC LIMIT $4"
const selectPositionInTopologySQL = "" +
"SELECT topological_position FROM syncapi_output_room_events_topology" +
@ -114,7 +114,7 @@ func (s *outputRoomEventsTopologyStatements) insertEventInTopology(
// Returns an empty slice if no events match the given range.
func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
ctx context.Context, roomID string, fromPos, toPos types.StreamPosition,
chronologicalOrder bool,
limit int, chronologicalOrder bool,
) (eventIDs []string, err error) {
// Decide on the selection's order according to whether chronological order
// is requested or not.
@ -126,7 +126,7 @@ func (s *outputRoomEventsTopologyStatements) selectEventIDsInRange(
}
// Query the event IDs.
rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos)
rows, err := stmt.QueryContext(ctx, roomID, fromPos, toPos, limit)
if err == sql.ErrNoRows {
// If no event matched the request, return an empty slice.
return []string{}, nil

2
src/github.com/matrix-org/dendrite/syncapi/storage/syncserver.go
View file

@ -227,7 +227,7 @@ func (d *SyncServerDatabase) GetEventsInRange(
// Select the event IDs from the defined range.
var eIDs []string
eIDs, err = d.topology.selectEventIDsInRange(
ctx, roomID, backwardLimit, forwardLimit, !backwardOrdering,
ctx, roomID, backwardLimit, forwardLimit, limit, !backwardOrdering,
)
if err != nil {
return