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