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Fix the ordering of events in a response to /sync (#588)
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@ -17,6 +17,7 @@ package storage
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import (
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"context"
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"database/sql"
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"sort"
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"github.com/matrix-org/dendrite/roomserver/api"
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@ -65,7 +66,7 @@ const selectEventsSQL = "" +
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const selectRecentEventsSQL = "" +
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"SELECT id, event_json, device_id, transaction_id FROM syncapi_output_room_events" +
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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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" ORDER BY id DESC LIMIT $4"
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const selectMaxEventIDSQL = "" +
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"SELECT MAX(id) FROM syncapi_output_room_events"
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@ -234,6 +235,12 @@ func (s *outputRoomEventsStatements) selectRecentEvents(
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if err != nil {
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return nil, err
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}
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// The events need to be returned from oldest to latest, which isn't
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// necessary the way the SQL query returns them, so a sort is necessary to
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// ensure the events are in the right order in the slice.
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sort.SliceStable(events, func(i int, j int) bool {
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return events[i].streamPosition < events[j].streamPosition
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})
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return events, nil
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}
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