feat(database): implement sql adapter for backwards compatibility

backend/v3/storage/database/dialect/sql/tx.go

@@ -0,0 +1,103 @@
+package sql
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+
+	"github.com/zitadel/zitadel/backend/v3/storage/database"
+)
+
+type sqlTx struct{ *sql.Tx }
+
+var _ database.Transaction = (*sqlTx)(nil)
+
+func SQLTx(tx *sql.Tx) *sqlTx {
+	return &sqlTx{
+		Tx: tx,
+	}
+}
+
+// Commit implements [database.Transaction].
+func (tx *sqlTx) Commit(ctx context.Context) error {
+	return wrapError(tx.Tx.Commit())
+}
+
+// Rollback implements [database.Transaction].
+func (tx *sqlTx) Rollback(ctx context.Context) error {
+	return wrapError(tx.Tx.Rollback())
+}
+
+// End implements [database.Transaction].
+func (tx *sqlTx) End(ctx context.Context, err error) error {
+	if err != nil {
+		rollbackErr := tx.Rollback(ctx)
+		if rollbackErr != nil {
+			err = errors.Join(err, rollbackErr)
+		}
+		return err
+	}
+	return tx.Commit(ctx)
+}
+
+// Query implements [database.Transaction].
+// Subtle: this method shadows the method (Tx).Query of pgxTx.Tx.
+func (tx *sqlTx) Query(ctx context.Context, sql string, args ...any) (database.Rows, error) {
+	rows, err := tx.QueryContext(ctx, sql, args...)
+	if err != nil {
+		return nil, wrapError(err)
+	}
+	return &Rows{rows}, nil
+}
+
+// QueryRow implements [database.Transaction].
+// Subtle: this method shadows the method (Tx).QueryRow of pgxTx.Tx.
+func (tx *sqlTx) QueryRow(ctx context.Context, sql string, args ...any) database.Row {
+	return &Row{tx.QueryRowContext(ctx, sql, args...)}
+}
+
+// Exec implements [database.Transaction].
+// Subtle: this method shadows the method (Pool).Exec of pgxPool.Pool.
+func (tx *sqlTx) Exec(ctx context.Context, sql string, args ...any) (int64, error) {
+	res, err := tx.ExecContext(ctx, sql, args...)
+	if err != nil {
+		return 0, wrapError(err)
+	}
+	return res.RowsAffected()
+}
+
+// Begin implements [database.Transaction].
+// As postgres does not support nested transactions we use savepoints to emulate them.
+func (tx *sqlTx) Begin(ctx context.Context) (database.Transaction, error) {
+	_, err := tx.ExecContext(ctx, createSavepoint)
+	if err != nil {
+		return nil, wrapError(err)
+	}
+	return &sqlSavepoint{tx}, nil
+}
+
+func transactionOptionsToSQL(opts *database.TransactionOptions) *sql.TxOptions {
+	if opts == nil {
+		return nil
+	}
+
+	return &sql.TxOptions{
+		Isolation: isolationToSQL(opts.IsolationLevel),
+		ReadOnly:  accessModeToSQL(opts.AccessMode),
+	}
+}
+
+func isolationToSQL(isolation database.IsolationLevel) sql.IsolationLevel {
+	switch isolation {
+	case database.IsolationLevelSerializable:
+		return sql.LevelSerializable
+	case database.IsolationLevelReadCommitted:
+		return sql.LevelReadCommitted
+	default:
+		return sql.LevelSerializable
+	}
+}
+
+func accessModeToSQL(accessMode database.AccessMode) bool {
+	return accessMode == database.AccessModeReadOnly
+}