From patchwork Tue Oct 6 23:58:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 11819389 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 59C456CB for ; Wed, 7 Oct 2020 00:00:55 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id C05D7212CC for ; Wed, 7 Oct 2020 00:00:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bR48DZNm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C05D7212CC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:59042 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kPwt3-0001uo-L8 for patchwork-qemu-devel@patchwork.kernel.org; Tue, 06 Oct 2020 20:00:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38498) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kPwqw-0007tS-F0 for qemu-devel@nongnu.org; Tue, 06 Oct 2020 19:58:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:46496) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kPwqs-0002Jr-3Y for qemu-devel@nongnu.org; Tue, 06 Oct 2020 19:58:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602028715; 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=aXtAa28vJz2L/wQ3Jh/YpBLJMIWsXeQxkfChMSZykRs=; b=bR48DZNmc0U7oersonoSPfIEhR4t06S1IWJrfZ9nYNJYqyReU5P0wFxwI34eCqt/PF/ZOD GmOi9WY75G1vOgMzVkq8nNkAC0MlrhkGRsVfucpAjHZzFavSPgNWZoUPrxOq23TMIg0aPT CRRgGhOdYnPAiRK40Hq7LiphqdbnKxU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-377-EkqOACcdN7iQEezyTsYhgg-1; Tue, 06 Oct 2020 19:58:33 -0400 X-MC-Unique: EkqOACcdN7iQEezyTsYhgg-1 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 60EBA802ED5; Tue, 6 Oct 2020 23:58:32 +0000 (UTC) Received: from scv.redhat.com (ovpn-120-38.rdu2.redhat.com [10.10.120.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9DFE6BABA; Tue, 6 Oct 2020 23:58:31 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PATCH 07/20] python/machine.py: Add _qmp access shim Date: Tue, 6 Oct 2020 19:58:04 -0400 Message-Id: <20201006235817.3280413-8-jsnow@redhat.com> In-Reply-To: <20201006235817.3280413-1-jsnow@redhat.com> References: <20201006235817.3280413-1-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 Received-SPF: pass client-ip=216.205.24.124; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/06 00:55:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.733, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Eduardo Habkost , qemu-block@nongnu.org, Max Reitz , Cleber Rosa , John Snow Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Like many other Optional[] types, it's not always a given that this object will be set. Wrap it in a type-shim that raises a meaningful error and will always return a concrete type. Signed-off-by: John Snow Reviewed-by: Kevin Wolf --- python/qemu/machine.py | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/python/qemu/machine.py b/python/qemu/machine.py index d788e8aba8c..3e9cf09fd2d 100644 --- a/python/qemu/machine.py +++ b/python/qemu/machine.py @@ -135,7 +135,7 @@ def __init__(self, binary, args=None, wrapper=None, name=None, self._events = [] self._iolog = None self._qmp_set = True # Enable QMP monitor by default. - self._qmp = None + self._qmp_connection: Optional[qmp.QEMUMonitorProtocol] = None self._qemu_full_args = None self._temp_dir = None self._launched = False @@ -302,14 +302,14 @@ def _pre_launch(self): if self._remove_monitor_sockfile: assert isinstance(self._monitor_address, str) self._remove_files.append(self._monitor_address) - self._qmp = qmp.QEMUMonitorProtocol( + self._qmp_connection = qmp.QEMUMonitorProtocol( self._monitor_address, server=True, nickname=self._name ) def _post_launch(self): - if self._qmp: + if self._qmp_connection: self._qmp.accept() def _post_shutdown(self): @@ -320,9 +320,9 @@ def _post_shutdown(self): # Comprehensive reset for the failed launch case: self._early_cleanup() - if self._qmp: + if self._qmp_connection: self._qmp.close() - self._qmp = None + self._qmp_connection = None self._load_io_log() @@ -434,7 +434,7 @@ def _soft_shutdown(self, timeout: Optional[int], """ self._early_cleanup() - if self._qmp is not None: + if self._qmp_connection: if not has_quit: # Might raise ConnectionReset self._qmp.cmd('quit') @@ -515,11 +515,13 @@ def set_qmp_monitor(self, enabled=True): line. Default is True. @note: call this function before launch(). """ - if enabled: - self._qmp_set = True - else: - self._qmp_set = False - self._qmp = None + self._qmp_set = enabled + + @property + def _qmp(self) -> qmp.QEMUMonitorProtocol: + if self._qmp_connection is None: + raise QEMUMachineError("Attempt to access QMP with no connection") + return self._qmp_connection @classmethod def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]: