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 X-Spam-Level: X-Spam-Status: No, score=-6.6 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 3F9D5C433E1 for ; Tue, 2 Jun 2020 21:47:53 +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 09C4D205CB for ; Tue, 2 Jun 2020 21:47:52 +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="gFzauK2X" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 09C4D205CB 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]:56236 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jgElE-00073v-1j for qemu-devel@archiver.kernel.org; Tue, 02 Jun 2020 17:47:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47320) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jgEj9-0004sS-5m for qemu-devel@nongnu.org; Tue, 02 Jun 2020 17:45:43 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:44204 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 1jgEj8-0008L9-5h for qemu-devel@nongnu.org; Tue, 02 Jun 2020 17:45:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591134341; 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=V6vPM6AYq3oZLyd83BJvWKOnCz6g7DCIxzAnkyqnH8c=; b=gFzauK2XZ5Lvya9XRcgxPXfbRhCzF9XjJNzQfcTv/uoR0FwUp43/Ri+nX90uFR3aGev58X eePmoUcNdSpv0q4+K1QG5+6gnQ0F+nFNu9+s3Y7KJLw6L2M4Lm3KZScDkwi2UQW+Z89mPy r9vVK/q1DkOhwWA/Xw7u9d0QPeGzZXI= 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-155-TzK20cZlMAu1V1JhkOIPwg-1; Tue, 02 Jun 2020 17:45:38 -0400 X-MC-Unique: TzK20cZlMAu1V1JhkOIPwg-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 EE2981856975; Tue, 2 Jun 2020 21:45:37 +0000 (UTC) Received: from probe.redhat.com (ovpn-112-142.rdu2.redhat.com [10.10.112.142]) by smtp.corp.redhat.com (Postfix) with ESMTP id EB9C060BE1; Tue, 2 Jun 2020 21:45:34 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Subject: [PATCH v2 04/16] python/qmp.py: Do not return None from cmd_obj Date: Tue, 2 Jun 2020 17:45:16 -0400 Message-Id: <20200602214528.12107-5-jsnow@redhat.com> In-Reply-To: <20200602214528.12107-1-jsnow@redhat.com> References: <20200602214528.12107-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit 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 = 2020/06/02 15:54:57 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This makes typing the qmp library difficult, as it necessitates wrapping Optional[] around the type for every return type up the stack. At some point, it becomes difficult to discern or remember why it's None instead of the expected object. Use the python exception system to tell us exactly why we didn't get an object. Remove this special-cased return. Signed-off-by: John Snow --- python/qemu/qmp.py | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/python/qemu/qmp.py b/python/qemu/qmp.py index aa8a666b8ab..ef3c919b76c 100644 --- a/python/qemu/qmp.py +++ b/python/qemu/qmp.py @@ -225,22 +225,18 @@ def accept(self, timeout=15.0): self.__sockfile = self.__sock.makefile(mode='r') return self.__negotiate_capabilities() - def cmd_obj(self, qmp_cmd): + def cmd_obj(self, qmp_cmd: QMPMessage) -> QMPMessage: """ Send a QMP command to the QMP Monitor. @param qmp_cmd: QMP command to be sent as a Python dict - @return QMP response as a Python dict or None if the connection has - been closed + @return QMP response as a Python dict """ self.logger.debug(">>> %s", qmp_cmd) - try: - self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8')) - except OSError as err: - if err.errno == errno.EPIPE: - return None - raise err + self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8')) resp = self.__json_read() + if resp is None: + raise QMPConnectError("Unexpected empty reply from server") self.logger.debug("<<< %s", resp) return resp -- 2.21.3