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// Copyright 2018 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sqlite3
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/internal/sqlutil"
rstypes "github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/syncapi/storage/tables"
"github.com/matrix-org/dendrite/syncapi/types"
)
const outputRoomEventsTopologySchema = `
-- Stores output room events received from the roomserver.
CREATE TABLE IF NOT EXISTS syncapi_output_room_events_topology (
event_id TEXT PRIMARY KEY,
topological_position BIGINT NOT NULL,
stream_position BIGINT NOT NULL,
room_id TEXT NOT NULL,
UNIQUE(topological_position, room_id, stream_position)
);
-- The topological order will be used in events selection and ordering
-- CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_topological_position_idx ON syncapi_output_room_events_topology(topological_position, stream_position, room_id);
`
const insertEventInTopologySQL = "" +
"INSERT INTO syncapi_output_room_events_topology (event_id, topological_position, room_id, stream_position)" +
" VALUES ($1, $2, $3, $4)" +
" ON CONFLICT DO NOTHING"
const selectEventIDsInRangeASCSQL = "" +
"SELECT event_id, topological_position, stream_position 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)" +
") ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
const selectEventIDsInRangeDESCSQL = "" +
"SELECT event_id, topological_position, stream_position 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)" +
") ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
const selectPositionInTopologySQL = "" +
"SELECT topological_position, stream_position FROM syncapi_output_room_events_topology" +
" WHERE event_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;"
const purgeEventsTopologySQL = "" +
"DELETE FROM syncapi_output_room_events_topology WHERE room_id = $1"
type outputRoomEventsTopologyStatements struct {
db *sql.DB
insertEventInTopologyStmt *sql.Stmt
selectEventIDsInRangeASCStmt *sql.Stmt
selectEventIDsInRangeDESCStmt *sql.Stmt
selectPositionInTopologyStmt *sql.Stmt
selectStreamToTopologicalPositionAscStmt *sql.Stmt
selectStreamToTopologicalPositionDescStmt *sql.Stmt
purgeEventsTopologyStmt *sql.Stmt
}
func NewSqliteTopologyTable(db *sql.DB) (tables.Topology, error) {
s := &outputRoomEventsTopologyStatements{
db: db,
}
_, err := db.Exec(outputRoomEventsTopologySchema)
if err != nil {
return nil, err
}
return s, sqlutil.StatementList{
{&s.insertEventInTopologyStmt, insertEventInTopologySQL},
{&s.selectEventIDsInRangeASCStmt, selectEventIDsInRangeASCSQL},
{&s.selectEventIDsInRangeDESCStmt, selectEventIDsInRangeDESCSQL},
{&s.selectPositionInTopologyStmt, selectPositionInTopologySQL},
{&s.selectStreamToTopologicalPositionAscStmt, selectStreamToTopologicalPositionAscSQL},
{&s.selectStreamToTopologicalPositionDescStmt, selectStreamToTopologicalPositionDescSQL},
{&s.purgeEventsTopologyStmt, purgeEventsTopologySQL},
}.Prepare(db)
}
// 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 *rstypes.HeaderedEvent, pos types.StreamPosition,
) (types.StreamPosition, error) {
_, err := sqlutil.TxStmt(txn, s.insertEventInTopologyStmt).ExecContext(
ctx, event.EventID(), event.Depth(), event.RoomID().String(), pos,
)
return types.StreamPosition(event.Depth()), err
}
// SelectEventIDsInRange selects the IDs of events which positions are within a
// given range in a given room's topological order. Returns the start/end topological tokens for
// the returned eventIDs.
// Returns an empty slice if no events match the given range.
func (s *outputRoomEventsTopologyStatements) SelectEventIDsInRange(
ctx context.Context, txn *sql.Tx, roomID string,
minDepth, maxDepth, maxStreamPos types.StreamPosition,
limit int, chronologicalOrder bool,
) (eventIDs []string, start, end types.TopologyToken, err error) {
// Decide on the selection's order according to whether chronological order
// is requested or not.
var stmt *sql.Stmt
if chronologicalOrder {
stmt = sqlutil.TxStmt(txn, s.selectEventIDsInRangeASCStmt)
} else {
stmt = sqlutil.TxStmt(txn, s.selectEventIDsInRangeDESCStmt)
}
// Query the event IDs.
rows, err := stmt.QueryContext(ctx, roomID, minDepth, maxDepth, maxDepth, maxStreamPos, limit)
if err == sql.ErrNoRows {
// If no event matched the request, return an empty slice.
return []string{}, start, end, nil
} else if err != nil {
return
}
// Return the IDs.
var eventID string
var token types.TopologyToken
var tokens []types.TopologyToken
for rows.Next() {
if err = rows.Scan(&eventID, &token.Depth, &token.PDUPosition); err != nil {
return
}
eventIDs = append(eventIDs, eventID)
tokens = append(tokens, token)
}
// The values are already ordered by SQL, so we can use them as is.
if len(tokens) > 0 {
start = tokens[0]
end = tokens[len(tokens)-1]
}
return
}
// selectPositionInTopology returns the position of a given event in the
// topology of the room it belongs to.
func (s *outputRoomEventsTopologyStatements) SelectPositionInTopology(
ctx context.Context, txn *sql.Tx, eventID string,
) (pos types.StreamPosition, spos types.StreamPosition, err error) {
stmt := sqlutil.TxStmt(txn, s.selectPositionInTopologyStmt)
err = stmt.QueryRowContext(ctx, eventID).Scan(&pos, &spos)
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 = sqlutil.TxStmt(txn, s.selectStreamToTopologicalPositionDescStmt).QueryRowContext(ctx, roomID, streamPos).Scan(&topoPos)
} else {
err = sqlutil.TxStmt(txn, s.selectStreamToTopologicalPositionAscStmt).QueryRowContext(ctx, roomID, streamPos).Scan(&topoPos)
}
return
}
func (s *outputRoomEventsTopologyStatements) PurgeEventsTopology(
ctx context.Context, txn *sql.Tx, roomID string,
) error {
_, err := sqlutil.TxStmt(txn, s.purgeEventsTopologyStmt).ExecContext(ctx, roomID)
return err
}
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