dendrite/userapi/storage/postgres/deltas/2022012016470000_key_changes.go

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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 deltas
import (
"context"
"database/sql"
"fmt"
)
func UpRefactorKeyChanges(ctx context.Context, tx *sql.Tx) error {
// start counting from the last max offset, else 0. We need to do a count(*) first to see if there
// even are entries in this table to know if we can query for log_offset. Without the count then
// the query to SELECT the max log offset fails on new Dendrite instances as log_offset doesn't
// exist on that table. Even though we discard the error, the txn is tainted and gets aborted :/
var count int
_ = tx.QueryRowContext(ctx, `SELECT count(*) FROM keyserver_key_changes`).Scan(&count)
if count > 0 {
var maxOffset int64
_ = tx.QueryRowContext(ctx, `SELECT coalesce(MAX(log_offset), 0) AS offset FROM keyserver_key_changes`).Scan(&maxOffset)
if _, err := tx.ExecContext(ctx, fmt.Sprintf(`CREATE SEQUENCE IF NOT EXISTS keyserver_key_changes_seq START %d`, maxOffset)); err != nil {
return fmt.Errorf("failed to CREATE SEQUENCE for key changes, starting at %d: %s", maxOffset, err)
}
}
_, err := tx.ExecContext(ctx, `
-- make the new table
DROP TABLE IF EXISTS keyserver_key_changes;
CREATE TABLE IF NOT EXISTS keyserver_key_changes (
change_id BIGINT PRIMARY KEY DEFAULT nextval('keyserver_key_changes_seq'),
user_id TEXT NOT NULL,
CONSTRAINT keyserver_key_changes_unique_per_user UNIQUE (user_id)
);
`)
if err != nil {
return fmt.Errorf("failed to execute upgrade: %w", err)
}
return nil
}
func DownRefactorKeyChanges(ctx context.Context, tx *sql.Tx) error {
_, err := tx.ExecContext(ctx, `
-- Drop all data and revert back, we can't keep the data as Kafka offsets determine the numbers
DROP SEQUENCE IF EXISTS keyserver_key_changes_seq;
DROP TABLE IF EXISTS keyserver_key_changes;
CREATE TABLE IF NOT EXISTS keyserver_key_changes (
partition BIGINT NOT NULL,
log_offset BIGINT NOT NULL,
user_id TEXT NOT NULL,
CONSTRAINT keyserver_key_changes_unique UNIQUE (partition, log_offset)
);
`)
if err != nil {
return fmt.Errorf("failed to execute downgrade: %w", err)
}
return nil
}