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Better mapping of stream positions to topological positions in /messages (#2263)

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* Convert stream positions into topological positions for both `from` and `to` in `/messages`

* Hopefully it works now

* Remove unnecessary logging

* Return sane values if `StreamToTopologicalPosition` can't work out the right thing to do

* Revert logging change

* tweaks

* Fix `selectEventIDsInRangeASCSQL`

* Test `Getting messages going forward is limited for a departed room (SPEC-216)` was passing incorrectly so un-whitelist it
This commit is contained in:
Neil Alexander 2022-03-18 10:40:01 +00:00 • committed by GitHub
parent 191486438c
commit 475d3c1af9
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7 changed files with 128 additions and 84 deletions
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41
syncapi/storage/postgres/output_room_events_topology_table.go
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@ -51,7 +51,7 @@ const selectEventIDsInRangeASCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND (" +
"(topological_position > $2 AND topological_position < $3) OR" +
"(topological_position = $4 AND stream_position <= $5)" +
"(topological_position = $4 AND stream_position >= $5)" +
") ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
const selectEventIDsInRangeDESCSQL = "" +
@ -76,13 +76,21 @@ const selectMaxPositionInTopologySQL = "" +
const deleteTopologyForRoomSQL = "" +
"DELETE FROM syncapi_output_room_events_topology WHERE room_id = $1"
const selectStreamToTopologicalPositionAscSQL = "" +
"SELECT topological_position FROM syncapi_output_room_events_topology WHERE room_id = $1 AND stream_position >= $2 ORDER BY topological_position ASC LIMIT 1;"
const selectStreamToTopologicalPositionDescSQL = "" +
"SELECT topological_position FROM syncapi_output_room_events_topology WHERE room_id = $1 AND stream_position <= $2 ORDER BY topological_position DESC LIMIT 1;"
type outputRoomEventsTopologyStatements struct {
insertEventInTopologyStmt *sql.Stmt
selectEventIDsInRangeASCStmt *sql.Stmt
selectEventIDsInRangeDESCStmt *sql.Stmt
selectPositionInTopologyStmt *sql.Stmt
selectMaxPositionInTopologyStmt *sql.Stmt
deleteTopologyForRoomStmt *sql.Stmt
insertEventInTopologyStmt *sql.Stmt
selectEventIDsInRangeASCStmt *sql.Stmt
selectEventIDsInRangeDESCStmt *sql.Stmt
selectPositionInTopologyStmt *sql.Stmt
selectMaxPositionInTopologyStmt *sql.Stmt
deleteTopologyForRoomStmt *sql.Stmt
selectStreamToTopologicalPositionAscStmt *sql.Stmt
selectStreamToTopologicalPositionDescStmt *sql.Stmt
}
func NewPostgresTopologyTable(db *sql.DB) (tables.Topology, error) {
@ -109,6 +117,12 @@ func NewPostgresTopologyTable(db *sql.DB) (tables.Topology, error) {
if s.deleteTopologyForRoomStmt, err = db.Prepare(deleteTopologyForRoomSQL); err != nil {
return nil, err
}
if s.selectStreamToTopologicalPositionAscStmt, err = db.Prepare(selectStreamToTopologicalPositionAscSQL); err != nil {
return nil, err
}
if s.selectStreamToTopologicalPositionDescStmt, err = db.Prepare(selectStreamToTopologicalPositionDescSQL); err != nil {
return nil, err
}
return s, nil
}
@ -170,6 +184,19 @@ func (s *outputRoomEventsTopologyStatements) SelectPositionInTopology(
return
}
// SelectStreamToTopologicalPosition returns the closest position of a given event
// in the topology of the room it belongs to from the given stream position.
func (s *outputRoomEventsTopologyStatements) SelectStreamToTopologicalPosition(
ctx context.Context, txn *sql.Tx, roomID string, streamPos types.StreamPosition, backwardOrdering bool,
) (topoPos types.StreamPosition, err error) {
if backwardOrdering {
err = s.selectStreamToTopologicalPositionDescStmt.QueryRowContext(ctx, roomID, streamPos).Scan(&topoPos)
} else {
err = s.selectStreamToTopologicalPositionAscStmt.QueryRowContext(ctx, roomID, streamPos).Scan(&topoPos)
}
return
}
func (s *outputRoomEventsTopologyStatements) SelectMaxPositionInTopology(
ctx context.Context, txn *sql.Tx, roomID string,
) (pos types.StreamPosition, spos types.StreamPosition, err error) {