From patchwork Thu Jun 4 20:22:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 11588339 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 E0A3A90 for ; Thu, 4 Jun 2020 20:31:23 +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 B81E22067B for ; Thu, 4 Jun 2020 20:31:23 +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="Vlty2AZZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B81E22067B 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]:55082 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jgwWI-0002bJ-VI for patchwork-qemu-devel@patchwork.kernel.org; Thu, 04 Jun 2020 16:31:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49494) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jgwO5-0004It-Ux for qemu-devel@nongnu.org; Thu, 04 Jun 2020 16:22:53 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:48845 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jgwO4-0005Wv-Uk for qemu-devel@nongnu.org; Thu, 04 Jun 2020 16:22:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591302172; 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=vJ6BhU9KIFdT7vmlanlNOtR+XXUXXpb3sxgWYK1kMtM=; b=Vlty2AZZKki6a0Y/cVb8egzMA50tdGQ3W7QEu/NEv7xxbypn4Nh8aW+byFbNtDYzg24UtY hUSJHUYHnW1kF0W8+cF9WBmkAA/5Pa9fwQpr4mS8LvcjpyzEiD8XE04ftKqAnLYCucTGdN HIPEHHcsb/U+ppnOe7bbF9ELeOvG/X0= 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-239-dPegOdCyMDyDxkJA7Dze_g-1; Thu, 04 Jun 2020 16:22:50 -0400 X-MC-Unique: dPegOdCyMDyDxkJA7Dze_g-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A04EB81F0A5; Thu, 4 Jun 2020 20:22:49 +0000 (UTC) Received: from probe.redhat.com (ovpn-117-188.rdu2.redhat.com [10.10.117.188]) by smtp.corp.redhat.com (Postfix) with ESMTP id CB12F5D9CD; Thu, 4 Jun 2020 20:22:48 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PATCH v3 12/16] python/machine.py: Add _qmp access shim Date: Thu, 4 Jun 2020 16:22:32 -0400 Message-Id: <20200604202236.25039-13-jsnow@redhat.com> In-Reply-To: <20200604202236.25039-1-jsnow@redhat.com> References: <20200604202236.25039-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/04 01:31:23 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, 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_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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, John Snow , Max Reitz , Cleber Rosa , philmd@redhat.com 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 --- python/qemu/machine.py | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/python/qemu/machine.py b/python/qemu/machine.py index d8289936816..a451f9000d6 100644 --- a/python/qemu/machine.py +++ b/python/qemu/machine.py @@ -118,7 +118,7 @@ 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 @@ -285,7 +285,7 @@ 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 @@ -455,7 +455,13 @@ def set_qmp_monitor(self, enabled=True): self._qmp_set = True else: self._qmp_set = False - self._qmp = None + self._qmp_connection = None + + @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]: