mirror of
https://github.com/matrix-org/dendrite.git
synced 2024-11-27 00:31:55 -06:00
70 lines
2.6 KiB
Go
70 lines
2.6 KiB
Go
// Copyright 2022 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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)
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func UpRefactorKeyChanges(ctx context.Context, tx *sql.Tx) error {
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// start counting from the last max offset, else 0. We need to do a count(*) first to see if there
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// even are entries in this table to know if we can query for log_offset. Without the count then
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// the query to SELECT the max log offset fails on new Dendrite instances as log_offset doesn't
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// exist on that table. Even though we discard the error, the txn is tainted and gets aborted :/
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var count int
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_ = tx.QueryRowContext(ctx, `SELECT count(*) FROM keyserver_key_changes`).Scan(&count)
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if count > 0 {
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var maxOffset int64
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_ = tx.QueryRowContext(ctx, `SELECT coalesce(MAX(log_offset), 0) AS offset FROM keyserver_key_changes`).Scan(&maxOffset)
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if _, err := tx.ExecContext(ctx, fmt.Sprintf(`CREATE SEQUENCE IF NOT EXISTS keyserver_key_changes_seq START %d`, maxOffset)); err != nil {
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return fmt.Errorf("failed to CREATE SEQUENCE for key changes, starting at %d: %s", maxOffset, err)
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}
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}
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_, err := tx.ExecContext(ctx, `
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-- make the new table
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DROP TABLE IF EXISTS keyserver_key_changes;
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CREATE TABLE IF NOT EXISTS keyserver_key_changes (
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change_id BIGINT PRIMARY KEY DEFAULT nextval('keyserver_key_changes_seq'),
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user_id TEXT NOT NULL,
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CONSTRAINT keyserver_key_changes_unique_per_user UNIQUE (user_id)
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);
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`)
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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 DownRefactorKeyChanges(ctx context.Context, tx *sql.Tx) error {
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_, err := tx.ExecContext(ctx, `
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-- Drop all data and revert back, we can't keep the data as Kafka offsets determine the numbers
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DROP SEQUENCE IF EXISTS keyserver_key_changes_seq;
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DROP TABLE IF EXISTS keyserver_key_changes;
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CREATE TABLE IF NOT EXISTS keyserver_key_changes (
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partition BIGINT NOT NULL,
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log_offset BIGINT NOT NULL,
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user_id TEXT NOT NULL,
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CONSTRAINT keyserver_key_changes_unique UNIQUE (partition, log_offset)
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);
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`)
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if err != nil {
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return fmt.Errorf("failed to execute downgrade: %w", err)
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}
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return nil
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}
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