185 lines
7 KiB
Go
185 lines
7 KiB
Go
// Copyright 2018 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package postgres
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import (
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"context"
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"database/sql"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/syncapi/storage/tables"
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"github.com/matrix-org/dendrite/syncapi/types"
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"github.com/matrix-org/gomatrixserverlib"
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)
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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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-- The event ID for the event.
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event_id TEXT PRIMARY KEY,
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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, 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, 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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" RETURNING topological_position"
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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 (" +
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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 (" +
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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, stream_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 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 deleteTopologyForRoomSQL = "" +
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"DELETE FROM syncapi_output_room_events_topology WHERE room_id = $1"
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type outputRoomEventsTopologyStatements struct {
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insertEventInTopologyStmt *sql.Stmt
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selectEventIDsInRangeASCStmt *sql.Stmt
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selectEventIDsInRangeDESCStmt *sql.Stmt
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selectPositionInTopologyStmt *sql.Stmt
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selectMaxPositionInTopologyStmt *sql.Stmt
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deleteTopologyForRoomStmt *sql.Stmt
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}
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func NewPostgresTopologyTable(db *sql.DB) (tables.Topology, error) {
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s := &outputRoomEventsTopologyStatements{}
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_, err := db.Exec(outputRoomEventsTopologySchema)
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if err != nil {
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return nil, err
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}
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if s.insertEventInTopologyStmt, err = db.Prepare(insertEventInTopologySQL); err != nil {
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return nil, err
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}
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if s.selectEventIDsInRangeASCStmt, err = db.Prepare(selectEventIDsInRangeASCSQL); err != nil {
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return nil, err
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}
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if s.selectEventIDsInRangeDESCStmt, err = db.Prepare(selectEventIDsInRangeDESCSQL); err != nil {
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return nil, err
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}
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if s.selectPositionInTopologyStmt, err = db.Prepare(selectPositionInTopologySQL); err != nil {
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return nil, err
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}
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if s.selectMaxPositionInTopologyStmt, err = db.Prepare(selectMaxPositionInTopologySQL); err != nil {
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return nil, err
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}
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if s.deleteTopologyForRoomStmt, err = db.Prepare(deleteTopologyForRoomSQL); err != nil {
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return nil, err
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}
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return s, nil
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}
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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, txn *sql.Tx, event *gomatrixserverlib.HeaderedEvent, pos types.StreamPosition,
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) (topoPos types.StreamPosition, err error) {
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err = sqlutil.TxStmt(txn, s.insertEventInTopologyStmt).QueryRowContext(
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ctx, event.EventID(), event.Depth(), event.RoomID(), pos,
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).Scan(&topoPos)
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return
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}
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// SelectEventIDsInRange selects the IDs of events which positions are within a
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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, txn *sql.Tx, roomID string, minDepth, maxDepth, maxStreamPos 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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// is requested or not.
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var stmt *sql.Stmt
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if chronologicalOrder {
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stmt = s.selectEventIDsInRangeASCStmt
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} else {
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stmt = s.selectEventIDsInRangeDESCStmt
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}
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// Query the event IDs.
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rows, err := stmt.QueryContext(ctx, roomID, minDepth, maxDepth, maxDepth, maxStreamPos, 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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} else if err != nil {
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return
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectEventIDsInRange: rows.close() failed")
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// Return the IDs.
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var eventID string
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for rows.Next() {
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if err = rows.Scan(&eventID); err != nil {
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return
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}
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eventIDs = append(eventIDs, eventID)
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}
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return eventIDs, rows.Err()
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}
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// SelectPositionInTopology returns the position of a given event in the
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// topology of the room it belongs to.
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func (s *outputRoomEventsTopologyStatements) SelectPositionInTopology(
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ctx context.Context, txn *sql.Tx, eventID string,
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) (pos, spos types.StreamPosition, err error) {
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err = s.selectPositionInTopologyStmt.QueryRowContext(ctx, eventID).Scan(&pos, &spos)
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return
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}
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func (s *outputRoomEventsTopologyStatements) SelectMaxPositionInTopology(
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ctx context.Context, txn *sql.Tx, roomID string,
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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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func (s *outputRoomEventsTopologyStatements) DeleteTopologyForRoom(
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ctx context.Context, txn *sql.Tx, roomID string,
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) (err error) {
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_, err = sqlutil.TxStmt(txn, s.deleteTopologyForRoomStmt).ExecContext(ctx, roomID)
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return err
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}
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