From: Bruce Richardson <bruce.richardson@intel.com>
To: Owen Hilyard <ohilyard@iol.unh.edu>
Cc: "Juraj Linkeš" <juraj.linkes@pantheon.tech>,
"Thomas Monjalon" <thomas@monjalon.net>,
"David Marchand" <david.marchand@redhat.com>,
ronan.randles@intel.com,
"Honnappa Nagarahalli" <Honnappa.Nagarahalli@arm.com>,
"Tu, Lijuan" <lijuan.tu@intel.com>, dev <dev@dpdk.org>
Subject: Re: [PATCH v4 5/9] dts: add ssh connection extension
Date: Wed, 14 Sep 2022 14:15:37 +0100 [thread overview]
Message-ID: <YyHT+d1CeAtkn7OL@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <CAHx6DYDiznC+j+4HTuYzHtub7zTGYf_vymeUkO8YwE9xeAw0rQ@mail.gmail.com>
On Wed, Sep 14, 2022 at 08:02:37AM -0400, Owen Hilyard wrote:
> On Wed, Sep 14, 2022 at 3:46 AM Bruce Richardson
> <[1]bruce.richardson@intel.com> wrote:
> > On Fri, Jul 29, 2022 at 10:55:46AM +0000, Juraj Linkeš wrote:
> > > The class adds logging and history records to existing
> pexpect
> > methods.
> > >
> > > Signed-off-by: Owen Hilyard <[1][2]ohilyard@iol.unh.edu>
> > > Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
> > > ---
> > > dts/framework/ssh_connection.py | 70
> > +++++++++++++++++++++++++++++++++
> > > 1 file changed, 70 insertions(+)
> > > create mode 100644 dts/framework/ssh_connection.py
> > >
> >
> > One comment inline below.
> >
> > /Bruce
> >
> > Two questions on this function:
> >
> > * Is the getattr() check not equivalent to "if self.logger:"?
> >
> > It is. I missed it when looking over this code. I know that
> this close
> > function can run in a context where it loses the ability to
> make system
> > calls (an exit hook), but that doesn't matter for this as far
> as I
> > know.
> >
> > * Why the check for a non-none logger in this function, when
> other
> >
> > functions above always seem to call the logger directly
> without
> > checking?
> >
> > "close" can be called before "init_log" if the program crashes
> early
> > enough, so this is avoiding calling a function on a null
> object. No
> > other function can have that issue because by the time control
> is
> > returned to the user the logger is properly initalized. This is
> > especially important because an early failure in the community
> lab will
> > only be able to use logs to figure out what happened.
> >
> I'm a little confused by that explanation - can you perhaps clarify?
> This
> close function in part of an class, and the logger member is
> assigned its value
> in the constructor for that class, so how is it possible to call
> obj.close() before obj has been constructed?
>
> Due to how we are forced to add the hooks to flush logger buffers to
> disk before shutdown, even in the case of failures or SIGTERM, close
> can run WHILE the constructor is in the middle of executing. All of the
> resources except for the logger can be freed by python, but the logger
> requires special handling, so we check if it is null and then flush the
> buffers to disk if it is not. The actual logger object is only assigned
> to self.logger after it is completely initalized, so if it's not null,
> then it is in a good state and can be safely flushed. Here's a sequence
> of events that would lead to that check being needed:
> 1. Start constructing logging handle
> 2. Execute first line of the constructor
> 3. SIGTERM
> self.logger == None, since the entire world stops and moves to the
> cleanup functions registered with the interpreter. If we don't do this
> check, then the cleanup context crashes in this case.
>
Ack.
Thanks for the clear explanation, having the check now makes sense.
next prev parent reply other threads:[~2022-09-14 13:15 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-22 12:14 [PATCH v1 0/8] dts: ssh connection to a node Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 1/8] dts: add ssh pexpect library Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 2/8] dts: add locks for parallel node connections Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 3/8] dts: add ssh connection extension Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 4/8] dts: add basic logging facility Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 5/8] dts: add Node base class Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 6/8] dts: add config parser module Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 7/8] dts: add dts runtime workflow module Juraj Linkeš
2022-06-22 12:14 ` [PATCH v1 8/8] dts: add main script for running dts Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 0/8] ssh connection to a node Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 1/8] dts: add basic logging facility Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 2/8] dts: add ssh pexpect library Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 3/8] dts: add locks for parallel node connections Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 4/8] dts: add ssh connection extension Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 5/8] dts: add config parser module Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 6/8] dts: add Node base class Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 7/8] dts: add dts workflow module Juraj Linkeš
2022-07-11 14:51 ` [PATCH v2 8/8] dts: add dts executable script Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 0/9] dts: ssh connection to a node Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 1/9] dts: add project tools config Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 2/9] dts: add developer tools Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 3/9] dts: add basic logging facility Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 4/9] dts: add ssh pexpect library Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 5/9] dts: add ssh connection extension Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 6/9] dts: add config parser module Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 7/9] dts: add Node base class Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 8/9] dts: add dts workflow module Juraj Linkeš
2022-07-28 10:00 ` [PATCH v3 9/9] dts: add dts executable script Juraj Linkeš
2022-07-29 10:55 ` [PATCH v4 0/9] dts: ssh connection to a node Juraj Linkeš
2022-07-29 10:55 ` [PATCH v4 1/9] dts: add project tools config Juraj Linkeš
2022-08-10 6:30 ` Tu, Lijuan
2022-09-07 16:16 ` Bruce Richardson
2022-09-09 13:38 ` Juraj Linkeš
2022-09-09 13:52 ` Bruce Richardson
2022-09-09 14:13 ` Juraj Linkeš
2022-09-12 14:06 ` Owen Hilyard
2022-09-12 15:15 ` Bruce Richardson
2022-09-13 12:08 ` Juraj Linkeš
2022-09-13 14:18 ` Bruce Richardson
2022-09-13 19:03 ` Honnappa Nagarahalli
2022-09-13 19:19 ` Honnappa Nagarahalli
2022-09-14 9:37 ` Thomas Monjalon
2022-09-14 12:55 ` Juraj Linkeš
2022-09-14 13:11 ` Bruce Richardson
2022-09-14 14:28 ` Thomas Monjalon
2022-09-21 10:49 ` Juraj Linkeš
2022-09-13 19:11 ` Honnappa Nagarahalli
2022-07-29 10:55 ` [PATCH v4 2/9] dts: add developer tools Juraj Linkeš
2022-08-10 6:30 ` Tu, Lijuan
2022-09-07 16:37 ` Bruce Richardson
2022-09-13 12:38 ` Juraj Linkeš
2022-09-13 20:38 ` Honnappa Nagarahalli
2022-09-14 7:37 ` Bruce Richardson
2022-09-14 12:45 ` Juraj Linkeš
2022-09-14 13:13 ` Bruce Richardson
2022-09-14 14:26 ` Thomas Monjalon
2022-09-14 19:08 ` Honnappa Nagarahalli
2022-09-20 12:14 ` Juraj Linkeš
2022-09-20 12:22 ` Tu, Lijuan
2022-07-29 10:55 ` [PATCH v4 3/9] dts: add basic logging facility Juraj Linkeš
2022-08-10 6:31 ` Tu, Lijuan
2022-09-08 8:31 ` Bruce Richardson
2022-09-13 12:52 ` Juraj Linkeš
2022-09-13 23:31 ` Honnappa Nagarahalli
2022-09-14 12:51 ` Juraj Linkeš
2022-07-29 10:55 ` [PATCH v4 4/9] dts: add ssh pexpect library Juraj Linkeš
2022-08-10 6:31 ` Tu, Lijuan
2022-09-08 9:53 ` Bruce Richardson
2022-09-13 13:36 ` Juraj Linkeš
2022-09-13 14:23 ` Bruce Richardson
2022-09-13 14:59 ` Stanislaw Kardach
2022-09-13 17:23 ` Owen Hilyard
2022-09-14 0:03 ` Honnappa Nagarahalli
2022-09-14 7:42 ` Bruce Richardson
2022-09-14 7:58 ` Stanislaw Kardach
2022-09-14 19:57 ` Honnappa Nagarahalli
2022-09-19 14:21 ` Owen Hilyard
2022-09-20 17:54 ` Honnappa Nagarahalli
2022-09-21 1:01 ` Tu, Lijuan
2022-09-21 5:37 ` Jerin Jacob
2022-09-22 9:03 ` Juraj Linkeš
2022-09-14 9:42 ` Stanislaw Kardach
2022-09-22 9:41 ` Juraj Linkeš
2022-09-22 14:32 ` Stanislaw Kardach
2022-09-23 7:22 ` Juraj Linkeš
2022-09-23 8:15 ` Bruce Richardson
2022-09-23 10:18 ` Stanislaw Kardach
2022-07-29 10:55 ` [PATCH v4 5/9] dts: add ssh connection extension Juraj Linkeš
2022-08-10 6:32 ` Tu, Lijuan
2022-09-13 17:04 ` Bruce Richardson
2022-09-13 17:32 ` Owen Hilyard
2022-09-14 7:46 ` Bruce Richardson
2022-09-14 12:02 ` Owen Hilyard
2022-09-14 13:15 ` Bruce Richardson [this message]
2022-07-29 10:55 ` [PATCH v4 6/9] dts: add config parser module Juraj Linkeš
2022-08-10 6:33 ` Tu, Lijuan
2022-09-13 17:19 ` Bruce Richardson
2022-09-13 17:47 ` Owen Hilyard
2022-09-14 7:48 ` Bruce Richardson
2022-07-29 10:55 ` [PATCH v4 7/9] dts: add Node base class Juraj Linkeš
2022-08-10 6:33 ` Tu, Lijuan
2022-07-29 10:55 ` [PATCH v4 8/9] dts: add dts workflow module Juraj Linkeš
2022-08-10 6:34 ` Tu, Lijuan
2022-07-29 10:55 ` [PATCH v4 9/9] dts: add dts executable script Juraj Linkeš
2022-08-10 6:35 ` Tu, Lijuan
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