From patchwork Tue Oct 20 17:27:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 302453 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CAEAC4363A for ; Tue, 20 Oct 2020 17:48:55 +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 7606D21D6C for ; Tue, 20 Oct 2020 17:48:54 +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="hanO8ZgB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7606D21D6C 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:35076 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kUvkj-0005Dh-Al for qemu-devel@archiver.kernel.org; Tue, 20 Oct 2020 13:48:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35880) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kUvQZ-0002oJ-7D for qemu-devel@nongnu.org; Tue, 20 Oct 2020 13:28:03 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:54206) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kUvQW-00007r-Id for qemu-devel@nongnu.org; Tue, 20 Oct 2020 13:28:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603214878; 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=20FmI42QTcBODBnrVTLW/uUn9qmr/W6lBuDyI2mPFRU=; b=hanO8ZgBCbvYS8wvtJw2z4CHm9R4Hz2Rw87MEn+Nzy/OizDApSeL7W0SNmT2s4beZ7Iy6i N9HTqg436zPCiqDfK6tUU9EGNcXd2Wngbl+sqeooiIoH/bwGMyWWOACGm3dfeCBM+Dl8ae 9sNcBbK/yTLaUYHbxp0A2Qb0v/Iz4vc= 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-407-gfNxqOpTOJqlOtVBBP-zwQ-1; Tue, 20 Oct 2020 13:27:55 -0400 X-MC-Unique: gfNxqOpTOJqlOtVBBP-zwQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C2EDF186DD20; Tue, 20 Oct 2020 17:27:54 +0000 (UTC) Received: from scv.redhat.com (ovpn-115-172.rdu2.redhat.com [10.10.115.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id D066127C2A; Tue, 20 Oct 2020 17:27:53 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PULL 06/21] python/machine.py: Handle None events in events_wait Date: Tue, 20 Oct 2020 13:27:27 -0400 Message-Id: <20201020172742.1483258-7-jsnow@redhat.com> In-Reply-To: <20201020172742.1483258-1-jsnow@redhat.com> References: <20201020172742.1483258-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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 = 2020/10/20 01:16:16 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_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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , Eduardo Habkost , qemu-block@nongnu.org, Max Reitz , Cleber Rosa , John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" If the timeout is 0, we can get None back. Handle this explicitly. Signed-off-by: John Snow Reviewed-by: Kevin Wolf Message-id: 20201006235817.3280413-6-jsnow@redhat.com Signed-off-by: John Snow --- python/qemu/machine.py | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/python/qemu/machine.py b/python/qemu/machine.py index 812ca7d349..aebfa09e9d 100644 --- a/python/qemu/machine.py +++ b/python/qemu/machine.py @@ -28,7 +28,7 @@ from typing import List, Optional, Type from . import console_socket, qmp -from .qmp import SocketAddrT +from .qmp import QMPMessage, SocketAddrT LOG = logging.getLogger(__name__) @@ -604,13 +604,20 @@ def event_wait(self, name, timeout=60.0, match=None): def events_wait(self, events, timeout=60.0): """ - events_wait waits for and returns a named event - from QMP with a timeout. + events_wait waits for and returns a single named event from QMP. + In the case of multiple qualifying events, this function returns the + first one. - events: a sequence of (name, match_criteria) tuples. - The match criteria are optional and may be None. - See event_match for details. - timeout: QEMUMonitorProtocol.pull_event timeout parameter. + :param events: A sequence of (name, match_criteria) tuples. + The match criteria are optional and may be None. + See event_match for details. + :param timeout: Optional timeout, in seconds. + See QEMUMonitorProtocol.pull_event. + + :raise QMPTimeoutError: If timeout was non-zero and no matching events + were found. + :return: A QMP event matching the filter criteria. + If timeout was 0 and no event matched, None. """ def _match(event): for name, match in events: @@ -618,6 +625,8 @@ def _match(event): return True return False + event: Optional[QMPMessage] + # Search cached events for event in self._events: if _match(event): @@ -627,6 +636,10 @@ def _match(event): # Poll for new events while True: event = self._qmp.pull_event(wait=timeout) + if event is None: + # NB: None is only returned when timeout is false-ish. + # Timeouts raise QMPTimeoutError instead! + break if _match(event): return event self._events.append(event)