dendrite/roomserver/storage/postgres/membership_table.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

395 lines
15 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 postgres
import (
"context"
"database/sql"
"fmt"
"github.com/lib/pq"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
)
const membershipSchema = `
-- The membership table is used to coordinate updates between the invite table
-- and the room state tables.
-- This table is updated in one of 3 ways:
-- 1) The membership of a user changes within the current state of the room.
-- 2) An invite is received outside of a room over federation.
-- 3) An invite is rejected outside of a room over federation.
CREATE TABLE IF NOT EXISTS roomserver_membership (
room_nid BIGINT NOT NULL,
-- Numeric state key ID for the user ID this state is for.
target_nid BIGINT NOT NULL,
-- Numeric state key ID for the user ID who changed the state.
-- This may be 0 since it is not always possible to identify the user that
-- changed the state.
sender_nid BIGINT NOT NULL DEFAULT 0,
-- The state the user is in within this room.
-- Default value is "membershipStateLeaveOrBan"
membership_nid BIGINT NOT NULL DEFAULT 1,
-- The numeric ID of the membership event.
-- It refers to the join membership event if the membership_nid is join (3),
-- and to the leave/ban membership event if the membership_nid is leave or
-- ban (1).
-- If the membership_nid is invite (2) and the user has been in the room
-- before, it will refer to the previous leave/ban membership event, and will
-- be equals to 0 (its default) if the user never joined the room before.
-- This NID is updated if the join event gets updated (e.g. profile update),
-- or if the user leaves/joins the room.
event_nid BIGINT NOT NULL DEFAULT 0,
-- Local target is true if the target_nid refers to a local user rather than
-- a federated one. This is an optimisation for resetting state on federated
-- room joins.
target_local BOOLEAN NOT NULL DEFAULT false,
forgotten BOOLEAN NOT NULL DEFAULT FALSE,
UNIQUE (room_nid, target_nid)
);
`
var selectJoinedUsersSetForRoomsSQL = "" +
"SELECT target_nid, COUNT(room_nid) FROM roomserver_membership WHERE room_nid = ANY($1) AND" +
" membership_nid = " + fmt.Sprintf("%d", tables.MembershipStateJoin) + " and forgotten = false" +
" GROUP BY target_nid"
// Insert a row in to membership table so that it can be locked by the
// SELECT FOR UPDATE
const insertMembershipSQL = "" +
"INSERT INTO roomserver_membership (room_nid, target_nid, target_local)" +
" VALUES ($1, $2, $3)" +
" ON CONFLICT DO NOTHING"
const selectMembershipFromRoomAndTargetSQL = "" +
"SELECT membership_nid, event_nid, forgotten FROM roomserver_membership" +
" WHERE room_nid = $1 AND target_nid = $2"
const selectMembershipsFromRoomAndMembershipSQL = "" +
"SELECT event_nid FROM roomserver_membership" +
" WHERE room_nid = $1 AND membership_nid = $2 and forgotten = false"
const selectLocalMembershipsFromRoomAndMembershipSQL = "" +
"SELECT event_nid FROM roomserver_membership" +
" WHERE room_nid = $1 AND membership_nid = $2" +
" AND target_local = true and forgotten = false"
const selectMembershipsFromRoomSQL = "" +
"SELECT event_nid FROM roomserver_membership" +
" WHERE room_nid = $1 and forgotten = false"
const selectLocalMembershipsFromRoomSQL = "" +
"SELECT event_nid FROM roomserver_membership" +
" WHERE room_nid = $1" +
" AND target_local = true and forgotten = false"
const selectMembershipForUpdateSQL = "" +
"SELECT membership_nid FROM roomserver_membership" +
" WHERE room_nid = $1 AND target_nid = $2 FOR UPDATE"
const updateMembershipSQL = "" +
"UPDATE roomserver_membership SET sender_nid = $3, membership_nid = $4, event_nid = $5, forgotten = $6" +
" WHERE room_nid = $1 AND target_nid = $2"
const updateMembershipForgetRoom = "" +
"UPDATE roomserver_membership SET forgotten = $3" +
" WHERE room_nid = $1 AND target_nid = $2"
const selectRoomsWithMembershipSQL = "" +
"SELECT room_nid FROM roomserver_membership WHERE membership_nid = $1 AND target_nid = $2 and forgotten = false"
// selectKnownUsersSQL uses a sub-select statement here to find rooms that the user is
// joined to. Since this information is used to populate the user directory, we will
// only return users that the user would ordinarily be able to see anyway.
var selectKnownUsersSQL = "" +
"SELECT DISTINCT event_state_key FROM roomserver_membership INNER JOIN roomserver_event_state_keys ON " +
"roomserver_membership.target_nid = roomserver_event_state_keys.event_state_key_nid" +
" WHERE room_nid = ANY(" +
" SELECT DISTINCT room_nid FROM roomserver_membership WHERE target_nid=$1 AND membership_nid = " + fmt.Sprintf("%d", tables.MembershipStateJoin) +
") AND membership_nid = " + fmt.Sprintf("%d", tables.MembershipStateJoin) + " AND event_state_key LIKE $2 LIMIT $3"
// selectLocalServerInRoomSQL is an optimised case for checking if we, the local server,
// are in the room by using the target_local column of the membership table. Normally when
// we want to know if a server is in a room, we have to unmarshal the entire room state which
// is expensive. The presence of a single row from this query suggests we're still in the
// room, no rows returned suggests we aren't.
const selectLocalServerInRoomSQL = "" +
"SELECT room_nid FROM roomserver_membership WHERE target_local = true AND membership_nid = $1 AND room_nid = $2 LIMIT 1"
// selectServerMembersInRoomSQL is an optimised case for checking for server members in a room.
// The JOIN is significantly leaner than the previous case of looking up event NIDs and reading the
// membership events from the database, as the JOIN query amounts to little more than two index
// scans which are very fast. The presence of a single row from this query suggests the server is
// in the room, no rows returned suggests they aren't.
const selectServerInRoomSQL = "" +
"SELECT room_nid FROM roomserver_membership" +
" JOIN roomserver_event_state_keys ON roomserver_membership.target_nid = roomserver_event_state_keys.event_state_key_nid" +
" WHERE membership_nid = $1 AND room_nid = $2 AND event_state_key LIKE '%:' || $3 LIMIT 1"
type membershipStatements struct {
insertMembershipStmt *sql.Stmt
selectMembershipForUpdateStmt *sql.Stmt
selectMembershipFromRoomAndTargetStmt *sql.Stmt
selectMembershipsFromRoomAndMembershipStmt *sql.Stmt
selectLocalMembershipsFromRoomAndMembershipStmt *sql.Stmt
selectMembershipsFromRoomStmt *sql.Stmt
selectLocalMembershipsFromRoomStmt *sql.Stmt
updateMembershipStmt *sql.Stmt
selectRoomsWithMembershipStmt *sql.Stmt
selectJoinedUsersSetForRoomsStmt *sql.Stmt
selectKnownUsersStmt *sql.Stmt
updateMembershipForgetRoomStmt *sql.Stmt
selectLocalServerInRoomStmt *sql.Stmt
selectServerInRoomStmt *sql.Stmt
}
func createMembershipTable(db *sql.DB) error {
_, err := db.Exec(membershipSchema)
return err
}
func prepareMembershipTable(db *sql.DB) (tables.Membership, error) {
s := &membershipStatements{}
return s, sqlutil.StatementList{
{&s.insertMembershipStmt, insertMembershipSQL},
{&s.selectMembershipForUpdateStmt, selectMembershipForUpdateSQL},
{&s.selectMembershipFromRoomAndTargetStmt, selectMembershipFromRoomAndTargetSQL},
{&s.selectMembershipsFromRoomAndMembershipStmt, selectMembershipsFromRoomAndMembershipSQL},
{&s.selectLocalMembershipsFromRoomAndMembershipStmt, selectLocalMembershipsFromRoomAndMembershipSQL},
{&s.selectMembershipsFromRoomStmt, selectMembershipsFromRoomSQL},
{&s.selectLocalMembershipsFromRoomStmt, selectLocalMembershipsFromRoomSQL},
{&s.updateMembershipStmt, updateMembershipSQL},
{&s.selectRoomsWithMembershipStmt, selectRoomsWithMembershipSQL},
{&s.selectJoinedUsersSetForRoomsStmt, selectJoinedUsersSetForRoomsSQL},
{&s.selectKnownUsersStmt, selectKnownUsersSQL},
{&s.updateMembershipForgetRoomStmt, updateMembershipForgetRoom},
{&s.selectLocalServerInRoomStmt, selectLocalServerInRoomSQL},
{&s.selectServerInRoomStmt, selectServerInRoomSQL},
}.Prepare(db)
}
func (s *membershipStatements) InsertMembership(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
localTarget bool,
) error {
stmt := sqlutil.TxStmt(txn, s.insertMembershipStmt)
_, err := stmt.ExecContext(ctx, roomNID, targetUserNID, localTarget)
return err
}
func (s *membershipStatements) SelectMembershipForUpdate(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) (membership tables.MembershipState, err error) {
err = sqlutil.TxStmt(txn, s.selectMembershipForUpdateStmt).QueryRowContext(
ctx, roomNID, targetUserNID,
).Scan(&membership)
return
}
func (s *membershipStatements) SelectMembershipFromRoomAndTarget(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
) (eventNID types.EventNID, membership tables.MembershipState, forgotten bool, err error) {
stmt := sqlutil.TxStmt(txn, s.selectMembershipFromRoomAndTargetStmt)
err = stmt.QueryRowContext(
ctx, roomNID, targetUserNID,
).Scan(&membership, &eventNID, &forgotten)
return
}
func (s *membershipStatements) SelectMembershipsFromRoom(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, localOnly bool,
) (eventNIDs []types.EventNID, err error) {
var stmt *sql.Stmt
if localOnly {
stmt = s.selectLocalMembershipsFromRoomStmt
} else {
stmt = s.selectMembershipsFromRoomStmt
}
stmt = sqlutil.TxStmt(txn, stmt)
rows, err := stmt.QueryContext(ctx, roomNID)
if err != nil {
return
}
defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsFromRoom: rows.close() failed")
for rows.Next() {
var eNID types.EventNID
if err = rows.Scan(&eNID); err != nil {
return
}
eventNIDs = append(eventNIDs, eNID)
}
return eventNIDs, rows.Err()
}
func (s *membershipStatements) SelectMembershipsFromRoomAndMembership(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, membership tables.MembershipState, localOnly bool,
) (eventNIDs []types.EventNID, err error) {
var rows *sql.Rows
var stmt *sql.Stmt
if localOnly {
stmt = s.selectLocalMembershipsFromRoomAndMembershipStmt
} else {
stmt = s.selectMembershipsFromRoomAndMembershipStmt
}
stmt = sqlutil.TxStmt(txn, stmt)
rows, err = stmt.QueryContext(ctx, roomNID, membership)
if err != nil {
return
}
defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsFromRoomAndMembership: rows.close() failed")
for rows.Next() {
var eNID types.EventNID
if err = rows.Scan(&eNID); err != nil {
return
}
eventNIDs = append(eventNIDs, eNID)
}
return eventNIDs, rows.Err()
}
func (s *membershipStatements) UpdateMembership(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, targetUserNID types.EventStateKeyNID, senderUserNID types.EventStateKeyNID, membership tables.MembershipState,
eventNID types.EventNID, forgotten bool,
) error {
_, err := sqlutil.TxStmt(txn, s.updateMembershipStmt).ExecContext(
ctx, roomNID, targetUserNID, senderUserNID, membership, eventNID, forgotten,
)
return err
}
func (s *membershipStatements) SelectRoomsWithMembership(
ctx context.Context, txn *sql.Tx,
userID types.EventStateKeyNID, membershipState tables.MembershipState,
) ([]types.RoomNID, error) {
stmt := sqlutil.TxStmt(txn, s.selectRoomsWithMembershipStmt)
rows, err := stmt.QueryContext(ctx, membershipState, userID)
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "SelectRoomsWithMembership: rows.close() failed")
var roomNIDs []types.RoomNID
for rows.Next() {
var roomNID types.RoomNID
if err := rows.Scan(&roomNID); err != nil {
return nil, err
}
roomNIDs = append(roomNIDs, roomNID)
}
return roomNIDs, nil
}
func (s *membershipStatements) SelectJoinedUsersSetForRooms(
ctx context.Context, txn *sql.Tx,
roomNIDs []types.RoomNID,
) (map[types.EventStateKeyNID]int, error) {
roomIDarray := make([]int64, len(roomNIDs))
for i := range roomNIDs {
roomIDarray[i] = int64(roomNIDs[i])
}
stmt := sqlutil.TxStmt(txn, s.selectJoinedUsersSetForRoomsStmt)
rows, err := stmt.QueryContext(ctx, pq.Int64Array(roomIDarray))
if err != nil {
return nil, err
}
defer internal.CloseAndLogIfError(ctx, rows, "selectJoinedUsersSetForRooms: rows.close() failed")
result := make(map[types.EventStateKeyNID]int)
for rows.Next() {
var userID types.EventStateKeyNID
var count int
if err := rows.Scan(&userID, &count); err != nil {
return nil, err
}
result[userID] = count
}
return result, rows.Err()
}
func (s *membershipStatements) SelectKnownUsers(
ctx context.Context, txn *sql.Tx,
userID types.EventStateKeyNID, searchString string, limit int,
) ([]string, error) {
stmt := sqlutil.TxStmt(txn, s.selectKnownUsersStmt)
rows, err := stmt.QueryContext(ctx, userID, fmt.Sprintf("%%%s%%", searchString), limit)
if err != nil {
return nil, err
}
result := []string{}
defer internal.CloseAndLogIfError(ctx, rows, "SelectKnownUsers: rows.close() failed")
for rows.Next() {
var userID string
if err := rows.Scan(&userID); err != nil {
return nil, err
}
result = append(result, userID)
}
return result, rows.Err()
}
func (s *membershipStatements) UpdateForgetMembership(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, targetUserNID types.EventStateKeyNID, forget bool,
) error {
_, err := sqlutil.TxStmt(txn, s.updateMembershipForgetRoomStmt).ExecContext(
ctx, roomNID, targetUserNID, forget,
)
return err
}
func (s *membershipStatements) SelectLocalServerInRoom(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID,
) (bool, error) {
var nid types.RoomNID
stmt := sqlutil.TxStmt(txn, s.selectLocalServerInRoomStmt)
err := stmt.QueryRowContext(ctx, tables.MembershipStateJoin, roomNID).Scan(&nid)
if err != nil {
if err == sql.ErrNoRows {
return false, nil
}
return false, err
}
found := nid > 0
return found, nil
}
func (s *membershipStatements) SelectServerInRoom(
ctx context.Context, txn *sql.Tx,
roomNID types.RoomNID, serverName gomatrixserverlib.ServerName,
) (bool, error) {
var nid types.RoomNID
stmt := sqlutil.TxStmt(txn, s.selectServerInRoomStmt)
err := stmt.QueryRowContext(ctx, tables.MembershipStateJoin, roomNID, serverName).Scan(&nid)
if err != nil {
if err == sql.ErrNoRows {
return false, nil
}
return false, err
}
return roomNID == nid, nil
}