121 lines
4.2 KiB
Go
121 lines
4.2 KiB
Go
// Copyright 2023 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package deltas
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import (
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"context"
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"database/sql"
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"fmt"
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"github.com/lib/pq"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/util"
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)
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func UpDropEventReferenceSHAEvents(ctx context.Context, tx *sql.Tx) error {
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_, err := tx.ExecContext(ctx, `ALTER TABLE roomserver_events DROP COLUMN IF EXISTS reference_sha256;`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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return nil
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}
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func UpDropEventReferenceSHAPrevEvents(ctx context.Context, tx *sql.Tx) error {
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_, err := tx.ExecContext(ctx, "ALTER TABLE roomserver_previous_events DROP CONSTRAINT roomserver_previous_event_id_unique;")
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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_, err = tx.ExecContext(ctx, `ALTER TABLE roomserver_previous_events DROP COLUMN IF EXISTS previous_reference_sha256;`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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// figure out if there are duplicates
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dupeRows, err := tx.QueryContext(ctx, `SELECT previous_event_id FROM roomserver_previous_events GROUP BY previous_event_id HAVING count(previous_event_id) > 1`)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeRows, "failed to close rows")
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var prevEvents []string
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var prevEventID string
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for dupeRows.Next() {
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if err = dupeRows.Scan(&prevEventID); err != nil {
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return err
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}
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prevEvents = append(prevEvents, prevEventID)
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}
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if dupeRows.Err() != nil {
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return dupeRows.Err()
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}
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// if we found duplicates, check if we can combine them, e.g. they are in the same room
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for _, dupeID := range prevEvents {
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var dupeNIDsRows *sql.Rows
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dupeNIDsRows, err = tx.QueryContext(ctx, `SELECT event_nids FROM roomserver_previous_events WHERE previous_event_id = $1`, dupeID)
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if err != nil {
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return fmt.Errorf("failed to query duplicate event ids")
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}
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defer internal.CloseAndLogIfError(ctx, dupeNIDsRows, "failed to close rows")
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var dupeNIDs []int64
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for dupeNIDsRows.Next() {
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var nids pq.Int64Array
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if err = dupeNIDsRows.Scan(&nids); err != nil {
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return err
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}
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dupeNIDs = append(dupeNIDs, nids...)
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}
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if dupeNIDsRows.Err() != nil {
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return dupeNIDsRows.Err()
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}
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// dedupe NIDs
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dupeNIDs = dupeNIDs[:util.SortAndUnique(nids(dupeNIDs))]
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// now that we have all NIDs, check which room they belong to
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var roomCount int
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err = tx.QueryRowContext(ctx, `SELECT count(distinct room_nid) FROM roomserver_events WHERE event_nid = ANY($1)`, pq.Array(dupeNIDs)).Scan(&roomCount)
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if err != nil {
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return err
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}
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// if the events are from different rooms, that's bad and we can't continue
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if roomCount > 1 {
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return fmt.Errorf("detected events (%v) referenced for different rooms (%v)", dupeNIDs, roomCount)
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}
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// otherwise delete the dupes
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_, err = tx.ExecContext(ctx, "DELETE FROM roomserver_previous_events WHERE previous_event_id = $1", dupeID)
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if err != nil {
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return fmt.Errorf("unable to delete duplicates: %w", err)
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}
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// insert combined values
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_, err = tx.ExecContext(ctx, "INSERT INTO roomserver_previous_events (previous_event_id, event_nids) VALUES ($1, $2)", dupeID, pq.Array(dupeNIDs))
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if err != nil {
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return fmt.Errorf("unable to insert new event NIDs: %w", err)
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}
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}
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_, err = tx.ExecContext(ctx, `ALTER TABLE roomserver_previous_events ADD CONSTRAINT roomserver_previous_event_id_unique UNIQUE (previous_event_id);`)
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if err != nil {
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return fmt.Errorf("failed to execute upgrade: %w", err)
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}
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return nil
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}
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type nids []int64
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func (s nids) Len() int { return len(s) }
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func (s nids) Less(i, j int) bool { return s[i] < s[j] }
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func (s nids) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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