From nobody Mon Feb 9 10:12:23 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1645654641224805.0869024617375; Wed, 23 Feb 2022 14:17:21 -0800 (PST) Received: from localhost ([::1]:43676 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nMzwm-0004hg-1Z for importer@patchew.org; Wed, 23 Feb 2022 17:17:20 -0500 Received: from eggs.gnu.org ([209.51.188.92]:54840) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nMzp6-0000wH-JU for qemu-devel@nongnu.org; Wed, 23 Feb 2022 17:09:24 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:37284) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nMzp2-0005ru-LV for qemu-devel@nongnu.org; Wed, 23 Feb 2022 17:09:24 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-26-f65Gn2ubOnSdOc6Zyn6WRA-1; Wed, 23 Feb 2022 17:09:17 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CCBB81854E21; Wed, 23 Feb 2022 22:09:15 +0000 (UTC) Received: from scv.redhat.com (unknown [10.22.16.166]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6EF6C709E5; Wed, 23 Feb 2022 22:09:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1645654160; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=witYTbxr9oKRoIKPRd/6sWMysbcp/swIQLQwQNY0iXU=; b=XsAa96EGkB1sx6rbV3JNytGPweOIR9kr43YTkSo+GdJouu9P3c35MzLMmxOpzEN7P41ioV 0EzokNBNjA3Ps63tBqq0L83mJkVzJft9XqoD+Z+JHBvXMtMn3qcYU069JsGHdpf9gVikZ8 hdHIosKttiqu+ipgwJzIBaeN8rgkif8= X-MC-Unique: f65Gn2ubOnSdOc6Zyn6WRA-1 From: John Snow To: qemu-devel@nongnu.org Subject: [PULL 2/6] python: support recording QMP session to a file Date: Wed, 23 Feb 2022 17:08:56 -0500 Message-Id: <20220223220900.2226630-3-jsnow@redhat.com> In-Reply-To: <20220223220900.2226630-1-jsnow@redhat.com> References: <20220223220900.2226630-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jsnow@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Beraldo Leal , qemu-block@nongnu.org, Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Eduardo Habkost , Hanna Reitz , Cleber Rosa , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1645654643842100001 From: Daniel P. Berrang=C3=A9 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 =3D=3D "query-kvm")= | .value.return.enabled' < q.log false Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Daniel P. Berrang=C3=A9 Message-id: 20220128161157.36261-3-berrange@redhat.com Signed-off-by: John Snow --- python/qemu/aqmp/qmp_shell.py | 29 ++++++++++++++++++++++------- python/setup.cfg | 3 +++ 2 files changed, 25 insertions(+), 7 deletions(-) diff --git a/python/qemu/aqmp/qmp_shell.py b/python/qemu/aqmp/qmp_shell.py index c60df787fc..35691494d0 100644 --- a/python/qemu/aqmp/qmp_shell.py +++ b/python/qemu/aqmp/qmp_shell.py @@ -89,6 +89,7 @@ from subprocess import Popen import sys from typing import ( + IO, Iterator, List, NoReturn, @@ -170,7 +171,8 @@ class QMPShell(QEMUMonitorProtocol): def __init__(self, address: SocketAddrT, pretty: bool =3D False, verbose: bool =3D False, - server: bool =3D False): + server: bool =3D False, + logfile: Optional[str] =3D None): super().__init__(address, server=3Dserver) self._greeting: Optional[QMPMessage] =3D None self._completer =3D QMPCompleter() @@ -180,6 +182,10 @@ def __init__(self, address: SocketAddrT, '.qmp-shell_history') self.pretty =3D pretty self.verbose =3D verbose + self.logfile =3D None + + if logfile is not None: + self.logfile =3D open(logfile, "w", encoding=3D'utf-8') =20 def close(self) -> None: # Hook into context manager of parent to save shell history. @@ -320,11 +326,11 @@ def _build_cmd(self, cmdline: str) -> Optional[QMPMes= sage]: self._cli_expr(cmdargs[1:], qmpcmd['arguments']) return qmpcmd =20 - def _print(self, qmp_message: object) -> None: + def _print(self, qmp_message: object, fh: IO[str] =3D sys.stdout) -> N= one: jsobj =3D json.dumps(qmp_message, indent=3D4 if self.pretty else None, sort_keys=3Dself.pretty) - print(str(jsobj)) + print(str(jsobj), file=3Dfh) =20 def _execute_cmd(self, cmdline: str) -> bool: try: @@ -347,6 +353,9 @@ def _execute_cmd(self, cmdline: str) -> bool: print('Disconnected') return False self._print(resp) + if self.logfile is not None: + cmd =3D {**qmpcmd, **resp} + self._print(cmd, fh=3Dself.logfile) return True =20 def connect(self, negotiate: bool =3D True) -> None: @@ -414,8 +423,9 @@ class HMPShell(QMPShell): def __init__(self, address: SocketAddrT, pretty: bool =3D False, verbose: bool =3D False, - server: bool =3D False): - super().__init__(address, pretty, verbose, server) + server: bool =3D False, + logfile: Optional[str] =3D None): + super().__init__(address, pretty, verbose, server, logfile) self._cpu_index =3D 0 =20 def _cmd_completion(self) -> None: @@ -508,6 +518,8 @@ def main() -> None: help=3D'Verbose (echo commands sent and received)') parser.add_argument('-p', '--pretty', action=3D'store_true', help=3D'Pretty-print JSON') + parser.add_argument('-l', '--logfile', + help=3D'Save log of all QMP messages to PATH') =20 default_server =3D os.environ.get('QMP_SOCKET') parser.add_argument('qmp_server', action=3D'store', @@ -526,7 +538,7 @@ def main() -> None: parser.error(f"Bad port number: {args.qmp_server}") return # pycharm doesn't know error() is noreturn =20 - with shell_class(address, args.pretty, args.verbose) as qemu: + with shell_class(address, args.pretty, args.verbose, args.logfile) as = qemu: try: qemu.connect(negotiate=3Dnot args.skip_negotiation) except ConnectError as err: @@ -550,6 +562,8 @@ def main_wrap() -> None: help=3D'Verbose (echo commands sent and received)') parser.add_argument('-p', '--pretty', action=3D'store_true', help=3D'Pretty-print JSON') + parser.add_argument('-l', '--logfile', + help=3D'Save log of all QMP messages to PATH') =20 parser.add_argument('command', nargs=3Dargparse.REMAINDER, help=3D'QEMU command line to invoke') @@ -574,7 +588,8 @@ def main_wrap() -> None: return # pycharm doesn't know error() is noreturn =20 try: - with shell_class(address, args.pretty, args.verbose, True) as qemu: + with shell_class(address, args.pretty, args.verbose, + True, args.logfile) as qemu: with Popen(cmd): =20 try: diff --git a/python/setup.cfg b/python/setup.cfg index 0959603238..9821db9880 100644 --- a/python/setup.cfg +++ b/python/setup.cfg @@ -114,7 +114,10 @@ ignore_missing_imports =3D True # no Warning level messages displayed, use "--disable=3Dall --enable=3Dcla= sses # --disable=3DW". disable=3Dconsider-using-f-string, + consider-using-with, + too-many-arguments, too-many-function-args, # mypy handles this with less false posit= ives. + too-many-instance-attributes, no-member, # mypy also handles this better. =20 [pylint.basic] --=20 2.34.1