This reverts commit a3cfea92e2.
(It's being rolled back in favor of a different API, which brings the
in-tree and out-of-tree versions of qemu.qmp back in sync.)
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230517163406.2593480-6-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Favor using connect() when passing a socket instead of
open_with_socket(). Simultaneously, update constructor calls to use the
combined address argument for QEMUMonitorProtocol().
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230517163406.2593480-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Instead of using accept() with sockets (which uses open_with_socket()),
use calls to connect() to utilize existing sockets instead. A benefit of
this is more robust error handling already present within the connect()
call that isn't present in open_with_socket().
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230517163406.2593480-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Instead of asserting that we have an address, allow the use of sockets
instead of addresses during a call to connect().
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230517163406.2593480-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Allow existing sockets to be passed to connect(). The changes are pretty
minimal, and this allows for far greater flexibility in setting up
communications with an endpoint.
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230517163406.2593480-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Convert the qmp-spec.txt document to restructuredText.
Notable points about the conversion:
* numbers at the start of section headings are removed, to match
the style of the rest of the manual
* cross-references to other sections or documents are hyperlinked
* various formatting tweaks (notably the examples, which need the
-> and <- prefixed so the QMP code-block lexer will accept them)
* English prose fixed in a few places
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20230515162245.3964307-2-peter.maydell@linaro.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
[.. code-block:: dumbed down to :: to work around CI failure]
Pylint 2.16 adds a few new checks that cause the optional check-tox CI
job to fail.
1. The superfluous-parens check seems to be a bit more aggressive,
2. broad-exception-raised is new; it discourages "raise Exception".
Fix these minor issues and turn the lights green.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20230210003147.1309376-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
When no monitor address is given, establish the QMP communication through
a socketpair() (API is also supported on Windows since Python 3.5)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20230111080101.969151-4-marcandre.lureau@redhat.com
[Resolved conflicts, fixed typing error. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
Teach QEMUMonitorProtocol to accept an exisiting socket.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20230111080101.969151-3-marcandre.lureau@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Instead of listening for incoming connections with a SocketAddr, add a
new method open_with_socket() that accepts an existing socket.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20230111080101.969151-2-marcandre.lureau@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Current 256KB is not enough for some real cases. As a possible solution
limit can be chosen to be the same as libvirt (10MB)
Signed-off-by: Maksim Davydov <davydov-max@yandex-team.ru>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20230112152805.33109-3-davydov-max@yandex-team.ru
Signed-off-by: John Snow <jsnow@redhat.com>
On macOS, private $TMPDIR's are the default. These $TMPDIR's are
generated from a user's unix UID and UUID [1], which can create a
relatively long path:
/var/folders/d7/rz20f6hd709c1ty8f6_6y_z40000gn/T/
QEMU's avocado tests create a temporary directory prefixed by
"avo_qemu_sock_", and create QMP sockets within _that_ as well.
The QMP socket is unnecessarily long, because a temporary directory
is created for every QEMUMachine object.
/avo_qemu_sock_uh3w_dgc/qemu-37331-10bacf110-monitor.sock
The path limit for unix sockets on macOS is 104: [2]
/*
* [XSI] Definitions for UNIX IPC domain.
*/
struct sockaddr_un {
unsigned char sun_len; /* sockaddr len including null */
sa_family_t sun_family; /* [XSI] AF_UNIX */
char sun_path[104]; /* [XSI] path name (gag) */
};
This results in avocado tests failing on macOS because the QMP unix
socket can't be created, because the path is too long:
ERROR| Failed to establish connection: OSError: AF_UNIX path too long
This change resolves by reducing the size of the socket directory prefix
and the suffix on the QMP and console socket names.
The result is paths like this:
pdel@pdel-mbp:/var/folders/d7/rz20f6hd709c1ty8f6_6y_z40000gn/T
$ tree qemu*
qemu_df4evjeq
qemu_jbxel3gy
qemu_ml9s_gg7
qemu_oc7h7f3u
qemu_oqb1yf97
├── 10a004050.con
└── 10a004050.qmp
[1] https://apple.stackexchange.com/questions/353832/why-is-mac-osx-temp-directory-in-weird-path
[2] /Library/Developer/CommandLineTools/SDKs/MacOSX12.3.sdk/usr/include/sys/un.h
Signed-off-by: Peter Delevoryas <peter@pjd.dev>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230110082930.42129-2-peter@pjd.dev
Signed-off-by: John Snow <jsnow@redhat.com>
I've spent much time trying to debug hanging pipeline in gitlab. I
started from and idea that I have problem in code in my series (which
has some timeouts). Finally I found that the problem is that I've used
QEMUMachine class directly to avoid qtest, and didn't add necessary
arguments. Qemu fails and we wait for qmp accept endlessly. In gitlab
it's just stopped by timeout (one hour) with no sign of what's going
wrong.
With timeout enabled, gitlab don't wait for an hour and prints all
needed information.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-Id: <20220624195252.175249-1-vsementsov@yandex-team.ru>
[Fixed typing. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
Fix some typos in 'python' directory.
Signed-off-by: Dongdong Zhang <zhangdongdong@eswincomputing.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20221130015358.6998-2-zhangdongdong@eswincomputing.com
[Fixed additional typo spotted by Max Filippov. --js]
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
If we request a shutdown of a VM without a QMP console, we'll just hang
waiting. Not ideal.
Add in code that attempts graceful termination in these cases. Tested
lightly; it appears to work and I doubt we rely on this case anywhere,
but it's a corner you're allowed to wedge yourself in, so it should be
handled.
Signed-off-by: John Snow <jsnow@redhat.com>
When key decisions are made about the lifetime of the VM process being
managed, there's no log entry. Juxtaposed with the very verbose runstate
change logging of the QMP module, machine seems a bit too introverted
now.
Season the machine.py module with logging statements to taste to help
make a tastier soup.
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220707163720.1421716-5-berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
'returns-whitelist' has been renamed to 'command-returns-exceptions' in
commit b86df37478 ("qapi: Rename pragma *-whitelist to *-exceptions").
Message-Id: <20220711095721.61280-1-thuth@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
We have about 30 instances of the typo/variant spelling 'writeable',
and over 500 of the more common 'writable'. Standardize on the
latter.
Change produced with:
sed -i -e 's/\([Ww][Rr][Ii][Tt]\)[Ee]\([Aa][Bb][Ll][Ee]\)/\1\2/g' $(git grep -il writeable)
and then hand-undoing the instance in linux-headers/linux/kvm.h.
Most of these changes are in comments or documentation; the
exceptions are:
* a local variable in accel/hvf/hvf-accel-ops.c
* a local variable in accel/kvm/kvm-all.c
* the PMCR_WRITABLE_MASK macro in target/arm/internals.h
* the EPT_VIOLATION_GPA_WRITABLE macro in target/i386/hvf/vmcs.h
(which is never used anywhere)
* the AR_TYPE_WRITABLE_MASK macro in target/i386/hvf/vmx.h
(which is never used anywhere)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Message-id: 20220505095015.2714666-1-peter.maydell@linaro.org
typeshed (included in mypy) recently updated to improve the typing for
WriteTransport objects. I was working around this, but now there's a
version where I shouldn't work around it.
Unfortunately this creates some minor ugliness if I want to support both
pre- and post-0.950 versions. For now, for my sanity, just disable the
unused-ignores warning.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220526000921.1581503-2-jsnow@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Pylint upgraded recently (2.13.z) and having a pylint: disable comment
in the middle of an argument field causes it some grief (It appears to
stop parsing when it encounters it, causing some syntax problems). Since
the duplicate line threshold was bumped up in 22305c2a08, we don't
need this workaround anymore. Drop it.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org>
Message-id: 20220330172812.3427355-10-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This is the last vestige of the "aqmp" moniker surviving in the tree; remove it.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org>
Message-id: 20220330172812.3427355-9-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Now that we are fully switched over to the new QMP library, move it back
over the old namespace. This is being done primarily so that we may
upload this package simply as "qemu.qmp" without introducing confusion
over whether or not "aqmp" is a new protocol or not.
The trade-off is increased confusion inside the QEMU developer
tree. Sorry!
Note: the 'private' member "_aqmp" in legacy.py also changes to "_qmp";
not out of necessity, but just to remove any traces of the "aqmp"
name.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Acked-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org>
Message-id: 20220330172812.3427355-8-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Thank you for your service!
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20220330172812.3427355-6-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Copy the docstrings out of qemu.qmp, adjusting them as necessary to
more accurately reflect the current state of this class.
(Licensing: This is copying and modifying GPLv2-only licensed docstrings
into a GPLv2-only file.)
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20220330172812.3427355-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
After this patch, qemu.aqmp.legacy.QEMUMonitorProtocol no longer
inherits from qemu.qmp.QEMUMonitorProtocol. To do this, several
inherited methods need to be explicitly re-defined.
(Licensing: This is copying and modifying GPLv2-only code into a
GPLv2-only file.)
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20220330172812.3427355-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Shift these definitions over from the qmp package to the async qmp
package.
(Licensing: this is a lateral move, from GPLv2 (only) to GPLv2 (only))
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20220330172812.3427355-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
aqmp-tui, the async QMP text user interface tool, is presently licensed
as GPLv2+. I intend to include this tool as an add-on to an LGPLv2+
library package hosted on PyPI.org. I've selected LGPLv2+ to maximize
compatibility with other licenses while retaining a copyleft license.
To keep licensing matters simple, I'd like to relicense this tool as
LGPLv2+ as well in order to keep the resultant license of the hosted
release files simple -- even if library users won't "link against" this
command line tool.
Therefore, I am asking permission to loosen the license.
Niteesh is effectively the sole author of this code, with scattered
lines from myself.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: G S Niteesh Babu <niteesh.gs@gmail.com>
Message-id: 20220325200438.2556381-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
qmp-shell is presently licensed as GPLv2 (only). I intend to include
this tool as an add-on to an LGPLv2+ library package hosted on
PyPI.org. I've selected LGPLv2+ to maximize compatibility with other
licenses while retaining a copyleft license.
To keep licensing matters simple, I'd like to relicense this tool as
LGPLv2+ as well in order to keep the resultant license of the hosted
release files simple -- even if library users won't "link against" this
command line tool.
Therefore, I am asking permission from the current authors of this
tool to loosen the license. At present, those people are:
- John Snow (me!), 411/609
- Luiz Capitulino, Author, 97/609
- Daniel Berrangé, 81/609
- Eduardo Habkost, 10/609
- Marc-André Lureau, 6/609
- Fam Zheng, 3/609
- Cleber Rosa, 1/609
(All of which appear to have been written under redhat.com addresses.)
Eduardo's fixes are largely automated from 2to3 conversion tools and may
not necessarily constitute authorship, but his signature would put to
rest any questions.
Cleber's changes concern a single import statement change. Also won't
hurt to ask.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Fam Zheng <fam@euphon.net>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Acked-by: Eduardo Habkost <eduardo@habkost.net>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Cleber Rosa <crosa@redhat.com>
Message-id: 20220325200438.2556381-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
I am the sole author of all of the async QMP code (python/qemu/aqmp)
with the following exceptions:
python/qemu/aqmp/qmp_shell.py and python/qemu/aqmp/legacy.py were
written by Luiz Capitulino (et al) and are already licensed separately
as GPLv2 (only).
aqmp_tui.py was written by Niteesh Babu G S and is licensed as GPLv2+.
I wish to relicense as LGPLv2+ in order to provide as much flexibility
as I reasonably can, while retaining a copyleft license. It is my belief
that LGPLv2+ is a suitable license for the Python ecosystem that aligns
with the goals and philosophy of the QEMU project.
The intent is to eventually drop legacy.py, leaving only library code
that is LGPLv2+.
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20220325200438.2556381-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
The legacy.py module is heavily based on the QMP module by Luiz
Capitulino (et al) which is licensed as explicit GPLv2-only. The async
QMP package is currently licensed similarly, but I intend to relicense
the async package to the more flexible LGPLv2+.
In preparation for that change, make the license on legacy.py explicit.
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20220325200438.2556381-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Remove the QEMU_PYTHON_LEGACY_QMP environment variable, making the
switch from sync qmp to async qmp permanent. Update exceptions and
import paths as necessary.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Acked-by: Hanna Reitz <hreitz@redhat.com>
Message-id: 20220321203315.909411-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This adds an Exception that extends the Python stdlib
subprocess.CalledProcessError.
The difference is that the str() method of this exception also adds the
stdout/stderr logs. In effect, if this exception goes unhandled, Python
will print the output in a visually distinct wrapper to the terminal so
that it's easy to spot in a sea of traceback information.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220321201618.903471-3-jsnow@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
>>> print(add_visual_margin(msg, width=72, name="Commit Message"))
┏━ Commit Message ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
┃ add_visual_margin() takes a chunk of text and wraps it in a visual
┃ container that force-wraps to a specified width. An optional title
┃ label may be given, and any of the individual glyphs used to draw the
┃ box may be replaced or specified as well.
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220321201618.903471-2-jsnow@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
_bind_hack() was a quick fix to allow async QMP to call bind(2) prior to
calling listen(2) and accept(2). This wasn't sufficient to fully address
the race condition present in synchronous clients.
With the race condition in legacy.py fixed (see the previous commit),
there are no longer any users of _bind_hack(). Drop it.
Fixes: b0b662bb2b
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-11-jsnow@redhat.com
[Expanded commit message. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
legacy.py provides a synchronous model. iotests frequently uses this
paradigm:
- create QMP client object
- start QEMU process
- await connection from QEMU process
In the switch from sync to async QMP, the QMP client object stopped
calling bind() and listen() during the QMP object creation step, which
creates a race condition if the QEMU process dials in too quickly.
With refactoring out of the way, restore the former behavior of calling
bind() and listen() during __init__() to fix this race condition.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-10-jsnow@redhat.com
[Expanded commit message. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
Add start_server() and accept() methods that can be used instead of
start_server_and_accept() to allow more fine-grained control over the
incoming connection process.
(Eagle-eyed reviewers will surely notice that it's a bit weird that
"CONNECTING" is a state that's shared between both the start_server()
and connect() states. That's absolutely true, and it's very true that
checking on the presence of _accepted as an indicator of state is a
hack. That's also very certainly true. But ... this keeps client code an
awful lot simpler, as it doesn't have to care exactly *how* the
connection is being made, just that it *is*. Is it worth disrupting that
simplicity in order to provide a better state guard on `accept()`? Hm.)
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-9-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Before we allow the full separation of starting the server and accepting
new connections, make sure that the disconnect cleans up the server and
its new state, too.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-8-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Refactor _do_accept() into _do_start_server() and _do_accept(). As of
this commit, the former calls the latter, but in subsequent commits
they'll be split apart.
(So please forgive the misnomer for _do_start_server(); it will live up
to its name shortly, and the docstring will be updated then too. I'm
just cutting down on some churn.)
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-7-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
I would really like to keep this under 1000 lines, I promise. Doesn't
look like it's gonna happen.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-6-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
As part of disentangling the monolithic nature of _do_accept(), split
out the incoming callback to prepare for factoring out the "wait for a
peer" step. Namely, this means using an event signal we can wait on from
outside of this method.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
These two methods attempted to entirely envelop the logic of
establishing a connection to a peer start to finish. However, we need to
break apart the incoming connection step into more granular steps. We
will no longer be able to reasonably constrain the logic inside of these
helper functions.
So, remove them - with _session_guard(), they no longer serve a real
purpose.
Although the public API doesn't change, the internal API does. Now that
there are no intermediary methods between e.g. connect() and
_do_connect(), there's no hook where the runstate is set. As a result,
the test suite changes a little to cope with the new semantics of
_do_accept() and _do_connect().
Lastly, take some pieces of the now-deleted docstrings and move
them up to the public interface level. They were a little more detailed,
and it won't hurt to keep them.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Previously, I had a method named "accept()" that under-the-hood calls
bind(2), listen(2) *and* accept(2). I meant this as a simplification and
counterpart to the one-shot "connect()" method.
This is confusing to readers who expect accept() to mean *just*
accept(2). Since I need to split apart the "accept()" method into
multiple methods anyway (one of which strongly resembling accept(2)), it
feels pertinent to rename this method *now*.
Rename this all-in-one method "start_server_and_accept()" instead.
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
In _new_session, there's a fairly complex except clause that's used to
give semantic errors to callers of accept() and connect(). We need to
create a new two-step replacement for accept(), so factoring out this
piece of logic will be useful.
Bolster the comments and docstring here to try and demystify what's
going on in this fairly delicate piece of Python magic.
(If we were using Python 3.7+, this would be an @asynccontextmanager. We
don't have that very nice piece of magic, however, so this must take an
Awaitable to manage the Exception contexts properly. We pay the price
for platform compatibility.)
Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220225205948.3693480-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
When running QMP commands with very large response payloads, it is often
not easy to spot the info you want. If we can save the response to a
file then tools like 'grep' or 'jq' can be used to extract information.
For convenience of processing, we merge the QMP command and response
dictionaries together:
{
"arguments": {},
"execute": "query-kvm",
"return": {
"enabled": false,
"present": true
}
}
Example usage
$ ./scripts/qmp/qmp-shell-wrap -l q.log -p -- ./build/qemu-system-x86_64 -display none
Welcome to the QMP low-level shell!
Connected
(QEMU) query-kvm
{
"return": {
"enabled": false,
"present": true
}
}
(QEMU) query-mice
{
"return": [
{
"absolute": false,
"current": true,
"index": 2,
"name": "QEMU PS/2 Mouse"
}
]
}
$ jq --slurp '. | to_entries[] | select(.value.execute == "query-kvm") |
.value.return.enabled' < q.log
false
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220128161157.36261-3-berrange@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
With the current 'qmp-shell' tool developers must first spawn QEMU with
a suitable -qmp arg and then spawn qmp-shell in a separate terminal
pointing to the right socket.
With 'qmp-shell-wrap' developers can ignore QMP sockets entirely and
just pass the QEMU command and arguments they want. The program will
listen on a UNIX socket and tell QEMU to connect QMP to that.
For example, this:
# qmp-shell-wrap -- qemu-system-x86_64 -display none
Is roughly equivalent of running:
# qemu-system-x86_64 -display none -qmp qmp-shell-1234 &
# qmp-shell qmp-shell-1234
Except that 'qmp-shell-wrap' switches the socket peers around so that
it is the UNIX socket server and QEMU is the socket client. This makes
QEMU reliably go away when qmp-shell-wrap exits, closing the server
socket.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20220128161157.36261-2-berrange@redhat.com
[Edited for rebase. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
The synchronous QMP library would bind to the server address during
__init__(). The new library delays this to the accept() call, because
binding occurs inside of the call to start_[unix_]server(), which is an
async method -- so it cannot happen during __init__ anymore.
Python 3.7+ adds the ability to create the server (and thus the bind()
call) and begin the active listening in separate steps, but we don't
have that functionality in 3.6, our current minimum.
Therefore ... Add a temporary workaround that allows the synchronous
version of the client to bind the socket in advance, guaranteeing that
there will be a UNIX socket in the filesystem ready for the QEMU client
to connect to without a race condition.
(Yes, it's a bit ugly. Fixing it more nicely will have to wait until our
minimum Python version is 3.7+.)
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20220201041134.1237016-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This allows us to pack in some extra information about the failure,
which guarantees that if the caller did not *intentionally* cause a
failure (by capturing this Exception), some pretty good clues will be
printed at the bottom of the traceback information.
This will help make failures in the event of a non-negative return code
more obvious when they go unhandled; the current behavior in
_post_shutdown() is to print a warning message only in the event of
signal-based terminations (for negative return codes).
(Note: In Python, catching BaseException instead of Exception catches a
broader array of Exception events, including SystemExit and
KeyboardInterrupt. We do not want to "wrap" such exceptions as a
VMLaunchFailure, because that will 'downgrade' the exception from a
BaseException to a regular Exception. We do, however, want to perform
cleanup in either case, so catch on the broadest scope and
wrap-and-re-raise only in the more targeted scope.)
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20220201041134.1237016-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
QEMU versions prior to the "oob" capability *also* can't accept the
"enable" keyword argument at all. Fix the handshake process with older
QEMU versions.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20220201041134.1237016-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
