[tarantool-patches] Re: [PATCH 2/2] Get rid of aurocommit from a txn structure
Konstantin Osipov
kostja at tarantool.org
Thu Apr 11 09:43:51 MSK 2019
* Georgy Kirichenko <georgy at tarantool.org> [19/04/10 10:26]:
> Move transaction auto start and auto commit behavior to box level.
> Now transaction won't start and commit automatically without
> txn_begin/txn_commit invocations. This is a part of a bigger transaction
> refactoring in order to implement detachable transactions and a parallel
> applier.
This change is looking good, the only nit is about so much labor
one has to do to run an autocommit transaction. If it was C++, I
would suggest adding a lambda which would auto-commit on
destruction, But given it's plain C, how about simply making the
code a bit more straightforward in its flow ?
> + if (txn_commit_stmt(txn, request) != 0 ||
> + (autocommit && txn_commit(txn) != 0))
> + goto fail;
> + if (autocommit)
> + fiber_gc();
> +
This piece in particular, I would rewrite:
if (txn_commit_stmt())
goto fail()
if (autocommit) {
if (txn_commit()
goto fail;
fiber_gc();
}
> + rc = 0;
> +done:
> + if (tuple != NULL)
> + tuple_unref(tuple);
> return rc;
> +
> +fail:
> + if (autocommit)
> + txn_rollback();
> + goto done;
I think using double labels like here is on the verge of goto
abuse.
> - if (box_process_rw(&request, space, NULL) != 0) {
> + struct txn *txn = txn_begin();
> + if (txn == NULL || box_process_rw(&request, space, NULL) != 0 ||
> + txn_commit(txn) != 0) {
> say_error("error applying row: %s", request_str(&request));
> + if (txn != NULL)
> + txn_rollback();
> diag_raise();
Here is another example.
--
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov
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