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// Copyright 2017-2018 New Vector Ltd
// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
//
// 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 postgres
import (
"context"
"database/sql"
"github.com/lib/pq"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/roomserver/types"
)
const roomsSchema = `
CREATE SEQUENCE IF NOT EXISTS roomserver_room_nid_seq;
CREATE TABLE IF NOT EXISTS roomserver_rooms (
-- Local numeric ID for the room.
room_nid BIGINT PRIMARY KEY DEFAULT nextval('roomserver_room_nid_seq'),
-- Textual ID for the room.
room_id TEXT NOT NULL CONSTRAINT roomserver_room_id_unique UNIQUE,
-- The most recent events in the room that aren't referenced by another event.
-- This list may empty if the server hasn't joined the room yet.
-- (The server will be in that state while it stores the events for the initial state of the room)
latest_event_nids BIGINT[] NOT NULL DEFAULT '{}'::BIGINT[],
-- The last event written to the output log for this room.
last_event_sent_nid BIGINT NOT NULL DEFAULT 0,
-- The state of the room after the current set of latest events.
-- This will be 0 if there are no latest events in the room.
state_snapshot_nid BIGINT NOT NULL DEFAULT 0
);
`
// Same as insertEventTypeNIDSQL
const insertRoomNIDSQL = "" +
"INSERT INTO roomserver_rooms (room_id) VALUES ($1)" +
" ON CONFLICT ON CONSTRAINT roomserver_room_id_unique" +
" DO NOTHING RETURNING (room_nid)"
const selectRoomNIDSQL = "" +
"SELECT room_nid FROM roomserver_rooms WHERE room_id = $1"
const selectLatestEventNIDsSQL = "" +
"SELECT latest_event_nids, state_snapshot_nid FROM roomserver_rooms WHERE room_nid = $1"
const selectLatestEventNIDsForUpdateSQL = "" +
"SELECT latest_event_nids, last_event_sent_nid, state_snapshot_nid FROM roomserver_rooms WHERE room_nid = $1 FOR UPDATE"
const updateLatestEventNIDsSQL = "" +
"UPDATE roomserver_rooms SET latest_event_nids = $2, last_event_sent_nid = $3, state_snapshot_nid = $4 WHERE room_nid = $1"
type roomStatements struct {
insertRoomNIDStmt *sql.Stmt
selectRoomNIDStmt *sql.Stmt
selectLatestEventNIDsStmt *sql.Stmt
selectLatestEventNIDsForUpdateStmt *sql.Stmt
updateLatestEventNIDsStmt *sql.Stmt
}
func (s *roomStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(roomsSchema)
if err != nil {
return
}
return statementList{
{&s.insertRoomNIDStmt, insertRoomNIDSQL},
{&s.selectRoomNIDStmt, selectRoomNIDSQL},
{&s.selectLatestEventNIDsStmt, selectLatestEventNIDsSQL},
{&s.selectLatestEventNIDsForUpdateStmt, selectLatestEventNIDsForUpdateSQL},
{&s.updateLatestEventNIDsStmt, updateLatestEventNIDsSQL},
}.prepare(db)
}
func (s *roomStatements) insertRoomNID(
ctx context.Context, txn *sql.Tx, roomID string,
) (types.RoomNID, error) {
var roomNID int64
stmt := common.TxStmt(txn, s.insertRoomNIDStmt)
err := stmt.QueryRowContext(ctx, roomID).Scan(&roomNID)
return types.RoomNID(roomNID), err
}
func (s *roomStatements) selectRoomNID(
ctx context.Context, txn *sql.Tx, roomID string,
) (types.RoomNID, error) {
var roomNID int64
stmt := common.TxStmt(txn, s.selectRoomNIDStmt)
err := stmt.QueryRowContext(ctx, roomID).Scan(&roomNID)
return types.RoomNID(roomNID), err
}
func (s *roomStatements) selectLatestEventNIDs(
ctx context.Context, roomNID types.RoomNID,
) ([]types.EventNID, types.StateSnapshotNID, error) {
var nids pq.Int64Array
var stateSnapshotNID int64
stmt := s.selectLatestEventNIDsStmt
err := stmt.QueryRowContext(ctx, int64(roomNID)).Scan(&nids, &stateSnapshotNID)
if err != nil {
return nil, 0, err
}
eventNIDs := make([]types.EventNID, len(nids))
for i := range nids {
eventNIDs[i] = types.EventNID(nids[i])
}
return eventNIDs, types.StateSnapshotNID(stateSnapshotNID), nil
}
func (s *roomStatements) selectLatestEventsNIDsForUpdate(
ctx context.Context, txn *sql.Tx, roomNID types.RoomNID,
) ([]types.EventNID, types.EventNID, types.StateSnapshotNID, error) {
var nids pq.Int64Array
var lastEventSentNID int64
var stateSnapshotNID int64
stmt := common.TxStmt(txn, s.selectLatestEventNIDsForUpdateStmt)
err := stmt.QueryRowContext(ctx, int64(roomNID)).Scan(&nids, &lastEventSentNID, &stateSnapshotNID)
if err != nil {
return nil, 0, 0, err
}
eventNIDs := make([]types.EventNID, len(nids))
for i := range nids {
eventNIDs[i] = types.EventNID(nids[i])
}
return eventNIDs, types.EventNID(lastEventSentNID), types.StateSnapshotNID(stateSnapshotNID), nil
}
func (s *roomStatements) updateLatestEventNIDs(
ctx context.Context,
txn *sql.Tx,
roomNID types.RoomNID,
eventNIDs []types.EventNID,
lastEventSentNID types.EventNID,
stateSnapshotNID types.StateSnapshotNID,
) error {
stmt := common.TxStmt(txn, s.updateLatestEventNIDsStmt)
_, err := stmt.ExecContext(
ctx,
roomNID,
eventNIDsAsArray(eventNIDs),
int64(lastEventSentNID),
int64(stateSnapshotNID),
)
return err
}
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