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// Copyright 2022 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/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/types"
)
const purgeEventJSONSQL = "" +
"DELETE FROM roomserver_event_json WHERE event_nid = ANY(" +
" SELECT event_nid FROM roomserver_events WHERE room_nid = $1" +
")"
const purgeEventsSQL = "" +
"DELETE FROM roomserver_events WHERE room_nid = $1"
const purgeInvitesSQL = "" +
"DELETE FROM roomserver_invites WHERE room_nid = $1"
const purgeMembershipsSQL = "" +
"DELETE FROM roomserver_membership WHERE room_nid = $1"
const purgePreviousEventsSQL = "" +
"DELETE FROM roomserver_previous_events WHERE event_nids && ANY(" +
" SELECT ARRAY_AGG(event_nid) FROM roomserver_events WHERE room_nid = $1" +
")"
// This removes the majority of prev events and is way faster than the above.
// The above query is still needed to delete the remaining prev events.
const purgePreviousEvents2SQL = "" +
"DELETE FROM roomserver_previous_events rpe WHERE EXISTS(SELECT event_id FROM roomserver_events re WHERE room_nid = $1 AND re.event_id = rpe.previous_event_id)"
const purgePublishedSQL = "" +
"DELETE FROM roomserver_published WHERE room_id = $1"
const purgeRedactionsSQL = "" +
"DELETE FROM roomserver_redactions WHERE redaction_event_id = ANY(" +
" SELECT event_id FROM roomserver_events WHERE room_nid = $1" +
")"
const purgeRoomAliasesSQL = "" +
"DELETE FROM roomserver_room_aliases WHERE room_id = $1"
const purgeRoomSQL = "" +
"DELETE FROM roomserver_rooms WHERE room_nid = $1"
const purgeStateBlockEntriesSQL = "" +
"DELETE FROM roomserver_state_block WHERE state_block_nid = ANY(" +
" SELECT DISTINCT UNNEST(state_block_nids) FROM roomserver_state_snapshots WHERE room_nid = $1" +
")"
const purgeStateSnapshotEntriesSQL = "" +
"DELETE FROM roomserver_state_snapshots WHERE room_nid = $1"
type purgeStatements struct {
purgeEventJSONStmt *sql.Stmt
purgeEventsStmt *sql.Stmt
purgeInvitesStmt *sql.Stmt
purgeMembershipsStmt *sql.Stmt
purgePreviousEventsStmt *sql.Stmt
purgePreviousEvents2Stmt *sql.Stmt
purgePublishedStmt *sql.Stmt
purgeRedactionStmt *sql.Stmt
purgeRoomAliasesStmt *sql.Stmt
purgeRoomStmt *sql.Stmt
purgeStateBlockEntriesStmt *sql.Stmt
purgeStateSnapshotEntriesStmt *sql.Stmt
}
func PreparePurgeStatements(db *sql.DB) (*purgeStatements, error) {
s := &purgeStatements{}
return s, sqlutil.StatementList{
{&s.purgeEventJSONStmt, purgeEventJSONSQL},
{&s.purgeEventsStmt, purgeEventsSQL},
{&s.purgeInvitesStmt, purgeInvitesSQL},
{&s.purgeMembershipsStmt, purgeMembershipsSQL},
{&s.purgePublishedStmt, purgePublishedSQL},
{&s.purgePreviousEventsStmt, purgePreviousEventsSQL},
{&s.purgePreviousEvents2Stmt, purgePreviousEvents2SQL},
{&s.purgeRedactionStmt, purgeRedactionsSQL},
{&s.purgeRoomAliasesStmt, purgeRoomAliasesSQL},
{&s.purgeRoomStmt, purgeRoomSQL},
{&s.purgeStateBlockEntriesStmt, purgeStateBlockEntriesSQL},
{&s.purgeStateSnapshotEntriesStmt, purgeStateSnapshotEntriesSQL},
}.Prepare(db)
}
func (s *purgeStatements) PurgeRoom(
ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, roomID string,
) error {
// purge by roomID
purgeByRoomID := []*sql.Stmt{
s.purgeRoomAliasesStmt,
s.purgePublishedStmt,
}
for _, stmt := range purgeByRoomID {
_, err := sqlutil.TxStmt(txn, stmt).ExecContext(ctx, roomID)
if err != nil {
return err
}
}
// purge by roomNID
purgeByRoomNID := []*sql.Stmt{
s.purgeStateBlockEntriesStmt,
s.purgeStateSnapshotEntriesStmt,
s.purgeInvitesStmt,
s.purgeMembershipsStmt,
s.purgePreviousEvents2Stmt, // Fast purge the majority of events
s.purgePreviousEventsStmt, // Slow purge the remaining events
s.purgeEventJSONStmt,
s.purgeRedactionStmt,
s.purgeEventsStmt,
s.purgeRoomStmt,
}
for _, stmt := range purgeByRoomNID {
_, err := sqlutil.TxStmt(txn, stmt).ExecContext(ctx, roomNID)
if err != nil {
return err
}
}
return nil
}
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