dendrite/roomserver/storage/sqlite3/storage.go
Neil Alexander eb352a5f6b
Full roomserver input transactional isolation (#2141)
* Add transaction to all database tables in roomserver, rename latest events updater to room updater, use room updater for all RS input

* Better transaction management

* Tweak order

* Handle cases where the room does not exist

* Other fixes

* More tweaks

* Fill some gaps

* Fill in the gaps

* good lord it gets worse

* Don't roll back transactions when events rejected

* Pass through errors properly

* Fix bugs

* Fix incorrect error check

* Don't panic on nil txns

* Tweaks

* Hopefully fix panics for good in SQLite this time

* Fix rollback

* Minor bug fixes with latest event updater

* Some review comments

* Revert "Some review comments"

This reverts commit 0caf8cf53e.

* Fix a couple of bugs

* Clearer commit and rollback results

* Remove unnecessary prepares
2022-02-04 10:39:34 +00:00

228 lines
6.6 KiB
Go

// 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 sqlite3
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/internal/caching"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/storage/shared"
"github.com/matrix-org/dendrite/roomserver/storage/sqlite3/deltas"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrixserverlib"
)
// A Database is used to store room events and stream offsets.
type Database struct {
shared.Database
}
// Open a sqlite database.
func Open(dbProperties *config.DatabaseOptions, cache caching.RoomServerCaches) (*Database, error) {
var d Database
var db *sql.DB
var err error
if db, err = sqlutil.Open(dbProperties); err != nil {
return nil, err
}
//db.Exec("PRAGMA journal_mode=WAL;")
//db.Exec("PRAGMA read_uncommitted = true;")
// FIXME: We are leaking connections somewhere. Setting this to 2 will eventually
// cause the roomserver to be unresponsive to new events because something will
// acquire the global mutex and never unlock it because it is waiting for a connection
// which it will never obtain.
db.SetMaxOpenConns(20)
// Create the tables.
if err := d.create(db); err != nil {
return nil, err
}
// Then execute the migrations. By this point the tables are created with the latest
// schemas.
m := sqlutil.NewMigrations()
deltas.LoadAddForgottenColumn(m)
deltas.LoadStateBlocksRefactor(m)
if err := m.RunDeltas(db, dbProperties); err != nil {
return nil, err
}
// Then prepare the statements. Now that the migrations have run, any columns referred
// to in the database code should now exist.
if err := d.prepare(db, cache); err != nil {
return nil, err
}
return &d, nil
}
func (d *Database) create(db *sql.DB) error {
if err := createEventStateKeysTable(db); err != nil {
return err
}
if err := createEventTypesTable(db); err != nil {
return err
}
if err := createEventJSONTable(db); err != nil {
return err
}
if err := createEventsTable(db); err != nil {
return err
}
if err := createRoomsTable(db); err != nil {
return err
}
if err := createStateBlockTable(db); err != nil {
return err
}
if err := createStateSnapshotTable(db); err != nil {
return err
}
if err := createPrevEventsTable(db); err != nil {
return err
}
if err := createRoomAliasesTable(db); err != nil {
return err
}
if err := createInvitesTable(db); err != nil {
return err
}
if err := createMembershipTable(db); err != nil {
return err
}
if err := createPublishedTable(db); err != nil {
return err
}
if err := createRedactionsTable(db); err != nil {
return err
}
return nil
}
func (d *Database) prepare(db *sql.DB, cache caching.RoomServerCaches) error {
eventStateKeys, err := prepareEventStateKeysTable(db)
if err != nil {
return err
}
eventTypes, err := prepareEventTypesTable(db)
if err != nil {
return err
}
eventJSON, err := prepareEventJSONTable(db)
if err != nil {
return err
}
events, err := prepareEventsTable(db)
if err != nil {
return err
}
rooms, err := prepareRoomsTable(db)
if err != nil {
return err
}
stateBlock, err := prepareStateBlockTable(db)
if err != nil {
return err
}
stateSnapshot, err := prepareStateSnapshotTable(db)
if err != nil {
return err
}
prevEvents, err := preparePrevEventsTable(db)
if err != nil {
return err
}
roomAliases, err := prepareRoomAliasesTable(db)
if err != nil {
return err
}
invites, err := prepareInvitesTable(db)
if err != nil {
return err
}
membership, err := prepareMembershipTable(db)
if err != nil {
return err
}
published, err := preparePublishedTable(db)
if err != nil {
return err
}
redactions, err := prepareRedactionsTable(db)
if err != nil {
return err
}
d.Database = shared.Database{
DB: db,
Cache: cache,
Writer: sqlutil.NewExclusiveWriter(),
EventsTable: events,
EventTypesTable: eventTypes,
EventStateKeysTable: eventStateKeys,
EventJSONTable: eventJSON,
RoomsTable: rooms,
StateBlockTable: stateBlock,
StateSnapshotTable: stateSnapshot,
PrevEventsTable: prevEvents,
RoomAliasesTable: roomAliases,
InvitesTable: invites,
MembershipTable: membership,
PublishedTable: published,
RedactionsTable: redactions,
GetRoomUpdaterFn: d.GetRoomUpdater,
}
return nil
}
func (d *Database) SupportsConcurrentRoomInputs() bool {
// This isn't supported in SQLite mode yet because of issues with
// database locks.
// TODO: Look at this again - the problem is probably to do with
// the membership updaters and latest events updaters.
return false
}
func (d *Database) GetRoomUpdater(
ctx context.Context, roomInfo *types.RoomInfo,
) (*shared.RoomUpdater, error) {
// TODO: Do not use transactions. We should be holding open this transaction but we cannot have
// multiple write transactions on sqlite. The code will perform additional
// write transactions independent of this one which will consistently cause
// 'database is locked' errors. As sqlite doesn't support multi-process on the
// same DB anyway, and we only execute updates sequentially, the only worries
// are for rolling back when things go wrong. (atomicity)
return shared.NewRoomUpdater(ctx, &d.Database, nil, roomInfo)
}
func (d *Database) MembershipUpdater(
ctx context.Context, roomID, targetUserID string,
targetLocal bool, roomVersion gomatrixserverlib.RoomVersion,
) (*shared.MembershipUpdater, error) {
// TODO: Do not use transactions. We should be holding open this transaction but we cannot have
// multiple write transactions on sqlite. The code will perform additional
// write transactions independent of this one which will consistently cause
// 'database is locked' errors. As sqlite doesn't support multi-process on the
// same DB anyway, and we only execute updates sequentially, the only worries
// are for rolling back when things go wrong. (atomicity)
return shared.NewMembershipUpdater(ctx, &d.Database, nil, roomID, targetUserID, targetLocal, roomVersion)
}