From patchwork Fri Jun 26 20:41:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 279255 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=-6.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 50C92C433DF for ; Fri, 26 Jun 2020 20:48:51 +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 1EDCB2075D for ; Fri, 26 Jun 2020 20:48:51 +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="Cv5qGzMk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1EDCB2075D 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]:52320 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jovHG-00009J-D7 for qemu-devel@archiver.kernel.org; Fri, 26 Jun 2020 16:48:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33928) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jovAf-00078G-3M for qemu-devel@nongnu.org; Fri, 26 Jun 2020 16:42:01 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:22033 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 1jovAc-0005rm-0T for qemu-devel@nongnu.org; Fri, 26 Jun 2020 16:42:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593204117; 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=VGhfiTXbiXd+kEnKFvL/DKq9TUWbI6mf0WxW/E8MJ8E=; b=Cv5qGzMkQvRNKXBRDYQGvLzQvnA2na2pCqFmPjoLjY/ofaVAycsdDivxuD2N6Z+nXz5rey FxVC4plzFTr4OmtmT1dGoYfZf4zkQjiPxCGzPqWeAAKjbn/JwpoPfBXUNTvuG7N01Mwro/ LTn543pVP7I8YVC1Sl25efaN5+ytk/w= 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-223-UiOS-Z6LNuSRkgzxosSuCQ-1; Fri, 26 Jun 2020 16:41:55 -0400 X-MC-Unique: UiOS-Z6LNuSRkgzxosSuCQ-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 91559107ACCA; Fri, 26 Jun 2020 20:41:54 +0000 (UTC) Received: from probe.redhat.com (ovpn-119-184.rdu2.redhat.com [10.10.119.184]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9C5F219C58; Fri, 26 Jun 2020 20:41:53 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PATCH v4 10/16] python/machine.py: Handle None events in events_wait Date: Fri, 26 Jun 2020 16:41:27 -0400 Message-Id: <20200626204133.14500-11-jsnow@redhat.com> In-Reply-To: <20200626204133.14500-1-jsnow@redhat.com> References: <20200626204133.14500-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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 = 2020/06/26 03:23:21 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=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+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 --- 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 8eb10a4bc1..f65bd18c1a 100644 --- a/python/qemu/machine.py +++ b/python/qemu/machine.py @@ -33,7 +33,7 @@ from types import TracebackType from . import qmp -from .qmp import SocketAddrT +from .qmp import SocketAddrT, QMPMessage LOG = logging.getLogger(__name__) @@ -552,13 +552,20 @@ 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: @@ -566,6 +573,8 @@ def _match(event): return True return False + event: Optional[QMPMessage] + # Search cached events for event in self._events: if _match(event): @@ -575,6 +584,10 @@ 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)