From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8BC2C433F5 for ; Mon, 17 Jan 2022 14:42:32 +0000 (UTC) Received: from localhost ([::1]:36404 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n9TDL-0008JO-Q1 for qemu-devel@archiver.kernel.org; Mon, 17 Jan 2022 09:42:31 -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 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= 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 X-MC-Unique: gZyW8PnFPRGZ2poAlwfs-Q-1 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) 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: 8bit 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 Signed-off-by: Daniel P. Berrangé --- 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 = False, verbose: bool = False, - server: bool = False): + server: bool = False, + logfile: str = None): super().__init__(address, server=server) self._greeting: Optional[QMPMessage] = None self._completer = QMPCompleter() @@ -175,6 +176,10 @@ def __init__(self, address: qmp.SocketAddrT, '.qmp-shell_history') self.pretty = pretty self.verbose = verbose + self.logfile = None + + if logfile is not None: + self.logfile = open(logfile, "w") 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[QMPMessage]: self._cli_expr(cmdargs[1:], qmpcmd['arguments']) return qmpcmd - def _print(self, qmp_message: object) -> None: + def _print(self, qmp_message: object, fh=sys.stdout) -> None: jsobj = json.dumps(qmp_message, indent=4 if self.pretty else None, sort_keys=self.pretty) - print(str(jsobj)) + print(str(jsobj), file=fh) 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 = {**qmpcmd, **resp} + self._print(cmd, fh=self.logfile) return True def connect(self, negotiate: bool = True) -> None: @@ -409,8 +417,9 @@ class HMPShell(QMPShell): def __init__(self, address: qmp.SocketAddrT, pretty: bool = False, verbose: bool = False, - server: bool = False): - super().__init__(address, pretty, verbose, server) + server: bool = False, + logfile: str = None): + super().__init__(address, pretty, verbose, server, logfile) self._cpu_index = 0 def _cmd_completion(self) -> None: @@ -503,6 +512,8 @@ def main() -> None: help='Verbose (echo commands sent and received)') parser.add_argument('-p', '--pretty', action='store_true', help='Pretty-print JSON') + parser.add_argument('-l', '--logfile', + help='Save log of all QMP messages to PATH') default_server = os.environ.get('QMP_SOCKET') parser.add_argument('qmp_server', action='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 - 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=not args.skip_negotiation) except qmp.QMPConnectError: @@ -545,6 +556,8 @@ def main_wrap() -> None: help='Verbose (echo commands sent and received)') parser.add_argument('-p', '--pretty', action='store_true', help='Pretty-print JSON') + parser.add_argument('-l', '--logfile', + help='Save log of all QMP messages to PATH') parser.add_argument('command', nargs=argparse.REMAINDER, help='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 - with shell_class(address, args.pretty, args.verbose, True) as qemu: + with shell_class(address, args.pretty, args.verbose, True, args.logfile) as qemu: qemuproc = Popen(cmd) try: -- 2.33.1