From nobody Mon Feb 9 00:20:31 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 1642430556467934.6482265276792; Mon, 17 Jan 2022 06:42:36 -0800 (PST) Received: from localhost ([::1]:36404 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n9TDP-0008JO-GV for importer@patchew.org; Mon, 17 Jan 2022 09:42:35 -0500 Received: from eggs.gnu.org ([209.51.188.92]:51234) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n9SjD-0004BG-SW for qemu-devel@nongnu.org; Mon, 17 Jan 2022 09:11:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:51641) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n9SjC-0001JV-4w for qemu-devel@nongnu.org; Mon, 17 Jan 2022 09:11:23 -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-140-gZyW8PnFPRGZ2poAlwfs-Q-1; Mon, 17 Jan 2022 09:11:13 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B4DEA1018725; Mon, 17 Jan 2022 14:11:12 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.33.36.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1DD2C753FB; Mon, 17 Jan 2022 14:11:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1642428681; 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=9fgGFMgDJGs1OmQ+wiN6PtoFPMsV5Y3xrxyTUjTf3Sg=; b=Cpnhaz+sxnAn9pYdy3d5ZPFwVO50Y+gJtxWpYwO6VwLYqPgCKSfkg0/0Vj6WVcuZB2Dowb AqdhjO2F9ICBF+0TVqAIO9tROGewE00Z2F7oBFxCKnOepoNOoqHt4rBK7tNQ5YRgRftoBO Qyhzfa8GQ6Cz6Mk2WpXUHUI0lAZw9HQ= X-MC-Unique: gZyW8PnFPRGZ2poAlwfs-Q-1 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH 2/2] python: support recording QMP session to a file Date: Mon, 17 Jan 2022 14:11:03 +0000 Message-Id: <20220117141103.157288-3-berrange@redhat.com> In-Reply-To: <20220117141103.157288-1-berrange@redhat.com> References: <20220117141103.157288-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@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=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: Eduardo Habkost , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , John Snow , Markus Armbruster , Cleber Rosa 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: 1642430557419100001 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 Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- python/qemu/qmp/qmp_shell.py | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/python/qemu/qmp/qmp_shell.py b/python/qemu/qmp/qmp_shell.py index 12f7d28afc..a50c3f1bc7 100644 --- a/python/qemu/qmp/qmp_shell.py +++ b/python/qemu/qmp/qmp_shell.py @@ -165,7 +165,8 @@ class QMPShell(qmp.QEMUMonitorProtocol): def __init__(self, address: qmp.SocketAddrT, pretty: bool =3D False, verbose: bool =3D False, - server: bool =3D False): + server: bool =3D False, + logfile: str =3D None): super().__init__(address, server=3Dserver) self._greeting: Optional[QMPMessage] =3D None self._completer =3D QMPCompleter() @@ -175,6 +176,10 @@ def __init__(self, address: qmp.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") =20 def close(self) -> None: # Hook into context manager of parent to save shell history. @@ -315,11 +320,11 @@ 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=3Dsys.stdout) -> None: 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: @@ -342,6 +347,9 @@ 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: @@ -409,8 +417,9 @@ class HMPShell(QMPShell): def __init__(self, address: qmp.SocketAddrT, pretty: bool =3D False, verbose: bool =3D False, - server: bool =3D False): - super().__init__(address, pretty, verbose, server) + server: bool =3D False, + logfile: str =3D None): + super().__init__(address, pretty, verbose, server, logfile) self._cpu_index =3D 0 =20 def _cmd_completion(self) -> None: @@ -503,6 +512,8 @@ 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', @@ -521,7 +532,7 @@ 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 qmp.QMPConnectError: @@ -545,6 +556,8 @@ 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') @@ -568,7 +581,7 @@ def main_wrap() -> None: parser.error(f"Bad port number: {socketpath}") return # pycharm doesn't know error() is noreturn =20 - with shell_class(address, args.pretty, args.verbose, True) as qemu: + with shell_class(address, args.pretty, args.verbose, True, args.logfil= e) as qemu: qemuproc =3D Popen(cmd) =20 try: --=20 2.33.1