mirror of
https://github.com/matrix-org/dendrite
synced 2024-11-18 07:40:53 +01:00
127 lines
4.2 KiB
Go
127 lines
4.2 KiB
Go
// Copyright 2020 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 postgres
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import (
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"context"
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"database/sql"
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"errors"
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"fmt"
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"github.com/matrix-org/dendrite/internal"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/userapi/storage/postgres/deltas"
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"github.com/matrix-org/dendrite/userapi/storage/tables"
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)
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var keyChangesSchema = `
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-- Stores key change information about users. Used to determine when to send updated device lists to clients.
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CREATE SEQUENCE IF NOT EXISTS keyserver_key_changes_seq;
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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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// Replace based on user ID. We don't care how many times the user's keys have changed, only that they
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// have changed, hence we can just keep bumping the change ID for this user.
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const upsertKeyChangeSQL = "" +
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"INSERT INTO keyserver_key_changes (user_id)" +
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" VALUES ($1)" +
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" ON CONFLICT ON CONSTRAINT keyserver_key_changes_unique_per_user" +
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" DO UPDATE SET change_id = nextval('keyserver_key_changes_seq')" +
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" RETURNING change_id"
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const selectKeyChangesSQL = "" +
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"SELECT user_id, change_id FROM keyserver_key_changes WHERE change_id > $1 AND change_id <= $2"
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type keyChangesStatements struct {
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db *sql.DB
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upsertKeyChangeStmt *sql.Stmt
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selectKeyChangesStmt *sql.Stmt
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}
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func NewPostgresKeyChangesTable(db *sql.DB) (tables.KeyChanges, error) {
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s := &keyChangesStatements{
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db: db,
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}
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_, err := db.Exec(keyChangesSchema)
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if err != nil {
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return s, err
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}
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if err = executeMigration(context.Background(), db); err != nil {
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return nil, err
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}
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return s, sqlutil.StatementList{
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{&s.upsertKeyChangeStmt, upsertKeyChangeSQL},
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{&s.selectKeyChangesStmt, selectKeyChangesSQL},
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}.Prepare(db)
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}
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func executeMigration(ctx context.Context, db *sql.DB) error {
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// TODO: Remove when we are sure we are not having goose artefacts in the db
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// This forces an error, which indicates the migration is already applied, since the
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// column partition was removed from the table
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migrationName := "keyserver: refactor key changes"
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var cName string
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err := db.QueryRowContext(ctx, "select column_name from information_schema.columns where table_name = 'keyserver_key_changes' AND column_name = 'partition'").Scan(&cName)
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if err != nil {
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if errors.Is(err, sql.ErrNoRows) { // migration was already executed, as the column was removed
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if err = sqlutil.InsertMigration(ctx, db, migrationName); err != nil {
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return fmt.Errorf("unable to manually insert migration '%s': %w", migrationName, err)
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}
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return nil
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}
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return err
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}
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m := sqlutil.NewMigrator(db)
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m.AddMigrations(sqlutil.Migration{
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Version: migrationName,
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Up: deltas.UpRefactorKeyChanges,
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})
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return m.Up(ctx)
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}
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func (s *keyChangesStatements) InsertKeyChange(ctx context.Context, userID string) (changeID int64, err error) {
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err = s.upsertKeyChangeStmt.QueryRowContext(ctx, userID).Scan(&changeID)
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return
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}
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func (s *keyChangesStatements) SelectKeyChanges(
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ctx context.Context, fromOffset, toOffset int64,
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) (userIDs []string, latestOffset int64, err error) {
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latestOffset = fromOffset
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rows, err := s.selectKeyChangesStmt.QueryContext(ctx, fromOffset, toOffset)
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if err != nil {
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return nil, 0, err
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}
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defer internal.CloseAndLogIfError(ctx, rows, "selectKeyChangesStmt: rows.close() failed")
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for rows.Next() {
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var userID string
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var offset int64
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if err := rows.Scan(&userID, &offset); err != nil {
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return nil, 0, err
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}
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if offset > latestOffset {
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latestOffset = offset
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}
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userIDs = append(userIDs, userID)
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}
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return
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}
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