Re: [PATCH 2/3] iotests/testrunner.py: move updating last_elapsed to run_tests

[Kevin Wolf <kwolf@redhat.com>]

Am 06.12.2021 um 18:59 hat John Snow geschrieben:
> On Fri, Dec 3, 2021 at 7:22 AM Vladimir Sementsov-Ogievskiy <
> vsementsov@virtuozzo.com> wrote:
> 
> > We are going to use do_run_test() in multiprocessing environment, where
> > we'll not be able to change original runner object.
> >
> > Happily, the only thing we change is that last_elapsed and it's simple
> > to do it in run_tests() instead. All other accesses to self in
> > do_runt_test() and in run_test() are read-only.
> >
> > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> > ---
> >  tests/qemu-iotests/testrunner.py | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/tests/qemu-iotests/testrunner.py
> > b/tests/qemu-iotests/testrunner.py
> > index fa842252d3..a9f2feb58c 100644
> > --- a/tests/qemu-iotests/testrunner.py
> > +++ b/tests/qemu-iotests/testrunner.py
> > @@ -287,7 +287,6 @@ def do_run_test(self, test: str) -> TestResult:
> >                                diff=diff, casenotrun=casenotrun)
> >          else:
> >              f_bad.unlink()
> > -            self.last_elapsed.update(test, elapsed)
> >              return TestResult(status='pass', elapsed=elapsed,
> >                                casenotrun=casenotrun)
> >
> > @@ -353,6 +352,9 @@ def run_tests(self, tests: List[str]) -> bool:
> >                      print('\n'.join(res.diff))
> >              elif res.status == 'not run':
> >                  notrun.append(name)
> > +            elif res.status == 'pass':
> > +                assert res.elapsed is not None
> > +                self.last_elapsed.update(t, res.elapsed)
> >
> >              sys.stdout.flush()
> >              if res.interrupted:
> > --
> > 2.31.1
> >
> >
> (I continue to be annoyed by the "None" problem in mypy, but I suppose it
> really can't be helped. Nothing for you to change with this patch or
> series. I just wish we didn't need so many assertions ...)

I'm inclined to say it's a None problem in our code, not in mypy.
Essentially it comes from the fact that we're abusing a string
(res.status) and None values to distinguish different types of results
that have a different set of valid attributes.

Of course, Python already provides a language feature to distinguish
different types of results that have a different set of attributes and
that wouldn't run into this problem: subclasses.

Kevin