Jakub Kicinski kuba@kernel.org writes:
On Tue, 2 Apr 2024 18:37:44 +0200 Petr Machata wrote:
Yeah, this would be usually done through context managers, as I mention in the other e-mail. But then cfg would be lexically scoped, which IMHO is a good thing, but then it needs to be passed around as an argument, and that makes the ksft_run() invocation a bit messy:
with NetDrvEnv(__file__) as cfg: ksft_run([lambda: check_pause(cfg), lambda: check_fec(cfg), lambda: pkt_byte_sum(cfg)])
Dunno, maybe it could forward *args **kwargs to the cases? But then it loses some of the readability again.
Yes, I was wondering about that. It must be doable, IIRC the multi-threading API "injects" args from a tuple. I was thinking something along the lines of:
with NetDrvEnv(__file__) as cfg: ksft_run([check_pause, check_fec, pkt_byte_sum], args=(cfg, ))
I got lazy, let me take a closer look. Another benefit will be that once we pass in "env" / cfg - we can "register" objects in there for auto-cleanup (in the future, current tests don't need cleanup)
Yeah, though some of those should probably just be their own context managers IMHO, not necessarily hooked to cfg. I'm thinking something fairly general, so that the support boilerplate doesn't end up costing an arm and leg:
with build("ip route add 192.0.2.1/28 nexthop via 192.0.2.17", "ip route del 192.0.2.1/28"), build("ip link set dev %s master %s" % (swp1, h1), "ip link set dev %s nomaster" % swp1): le_test()
Dunno. I guess it makes sense to have some of the common stuff predefined, e.g. "with vrf() as h1". And then the stuff that's typically in lib.sh's setup() and cleanup(), can be losslessly hooked up to cfg.
This is what I ended up gravitating towards after writing a handful of LNST tests anyway. The scoping makes it clear where the object exists, lifetime is taken care of, it's all ponies rainbows basically. At least as long as your object lifetimes can be cleanly nested, which admittedly is not always.