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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 CE4B8C35247 for ; Wed, 5 Feb 2020 00:10:46 +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 90FCF2085B for ; Wed, 5 Feb 2020 00:10:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dhcW2KzQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90FCF2085B 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]:39858 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iz8HF-0005qO-Lf for qemu-devel@archiver.kernel.org; Tue, 04 Feb 2020 19:10:45 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41640) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iz8GO-0005Ew-3z for qemu-devel@nongnu.org; Tue, 04 Feb 2020 19:09:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iz8GL-0004wP-JZ for qemu-devel@nongnu.org; Tue, 04 Feb 2020 19:09:51 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:40627 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iz8GL-0004g6-6g for qemu-devel@nongnu.org; Tue, 04 Feb 2020 19:09:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1580861388; 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:autocrypt:autocrypt; bh=rmEukLmQDQemnTeCg+5ZqN0WAHrjzQKPneiGTILf3pw=; b=dhcW2KzQGAKUEcD5N0Tfuguu+Ir2KuHHpAcioIXbi71rjYQiwUwHqUL9xW24vZH3QHWOUV XWwC0xNuflyW/9DPx+DVKDKTylQXaXlTYVF19bwEa74mnz6cETzhJQ/HB8iZGwSlpb5FWG lWr8rScI/285tA/i9jBI7wlvh8/04uY= 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-91-MAnAgEdROuW5fJ7smBtYTw-1; Tue, 04 Feb 2020 19:09:41 -0500 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 E3F8A102CE14; Wed, 5 Feb 2020 00:09:40 +0000 (UTC) Received: from [10.18.17.116] (dhcp-17-116.bos.redhat.com [10.18.17.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1BA50194BB; Wed, 5 Feb 2020 00:09:34 +0000 (UTC) Subject: Re: Does Libvirt's json parser support single quoted string in qmp json string? To: Eric Blake , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= References: <9bac386b-5a90-3c10-b63b-d45a2e8c2d58@redhat.com> <20200203101352.GB1922177@redhat.com> <1f285f58-7a8f-0656-4f0a-8acfe56bad43@redhat.com> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV vzzmCa3cOppcqKvA0Kqr10UeX/z4OMVV390V+DVWUvzXpda45/Sxup57pk+hyY52wxxjIqef rj8u5BN93s5uCVTus0oiVA6W+iXYzTvVDStMFVqnTxSxlpZoH5RGKvmoWV3uutByQyBPHW2U 1Y6n6iEZ9MlP3hcDqlo0S8jeP03HaD4gOqCuqLceWF5+2WyHzNfylpNMFVi+Hp0H/nSDtCvQ ua7j+6Pt7q5rvqgHvRipkDDVsjqwasuNc3wyoHexrBeLU/iJBuDld5iLy+dHXoYMB3HmjMxj 3K5/8XhGrDx6BDFeO3HIpi3u2z1jniB7RtyVEtdupED6lqsDj0oSz9NxaOFZrS3Jf6z/kHIf h42mM9Sx7+s4c07N2LieUxcfqhFTaa/voRibF4cmkBVUhOD1AKXNfhEsTvmcz9NbUchCkcvA T9119CrsxfVsE7bXiGvdXnzyGLXdsoosjzwacKdOrVaDmN3Uy+SHiQXo6TlkSdV0XH2PUxTM 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1.0 In-Reply-To: <1f285f58-7a8f-0656-4f0a-8acfe56bad43@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: MAnAgEdROuW5fJ7smBtYTw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 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: libvirt-users@redhat.com, Peter Luo , Markus Armbruster , QEMU Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/3/20 11:27 AM, Eric Blake wrote: > [adding Markus] >=20 > On 2/3/20 4:13 AM, Daniel P. Berrang=C3=A9 wrote: >> On Fri, Jan 31, 2020 at 06:44:42AM -0600, Eric Blake wrote: >>> On 1/31/20 4:38 AM, Peter Luo wrote: >>> >>>> error: internal error: cannot parse json {"execute": "block-commit", >>>> "arguments": { "device": "drive-virtio-disk2", "job-id": "job100", >>>> "base":'json:{"encrypt.key-secret":"vol-38973xjl.secret","driver":"qco= w2","file":{"driver":"file","filename":"/pitrix/data/container/vol-38973xjl= .img"}}', >>>> "top": "/pitrix/data/container/vol-38973xjl_ss-2tw7v0mm.img"}}: >>>> lexical error: invalid char in json text. >>>> >>>> =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 , "job-i= d": "job100", >>>> "base":'json:{"encrypt.key-secret":"vo >>>> >>>> =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (right here) ----= --^ >>>> >>> >>> qemu's QMP language has an extension where it accepts 'string' in >>> addition >>> to the JSON "string".=C2=A0 But it uses a hand-rolled parser, so it can= do >>> whatever it wants. >> >> Can we deprecate & remove this extension in QEMU ? >=20 > We could start a deprecation clock, if desired, but I don't know how > many external users would be impacted (at least qemu's testsuite heavily > relies on the extension of single quotes). >=20 > Are there any third-party libraries that parse JSON5? https://json5.org/ > documents that one of the nice features of JSON5 is that single quotes > work out of the box.=C2=A0 Right now, even though qemu does NOT parse the > same thing as pure JSON (which is > https://datatracker.ietf.org/doc/rfc8259/), it does appear to parse a > subset of JSON5, where the additional features of JSON5 (such as > allowing a trailing comma, escaped newlines within strings, allowing > bareword key:"value" syntax, a larger set of accepted numeric values, > allowing comments) don't seem that onerous. >=20 >> >> If we're going to call QMP protocol JSON, then IMHO QEMU should follow >> the JSON spec as closely as possible, without extensions. >=20 > As it is, qemu explicitly does NOT parse all valid JSON - it rejects > non-ASCII bytes (whether as UTF-8 or as \u escape sequences) in strings. > =C2=A0So the fact that it already extensions in some places and limitatio= ns > in others is a burden for clients to be aware of. >=20 >> >> On the flip side, if we're going to support extensions like single >> quoting, >> then we should make it clear to applications that this is not really JSO= N >> and that they need to provide an impl that is 100% matching QEMU's >> dialect. >> This effectively means they need just import a copy of QEMU's code. >> >> Regards, >> Daniel >> >=20 More anecdata: qmp-shell will also accept either strict JSON or what it calls "fuzzy" JSON, which allows single quotes, Python spellings for boolean constants, and other deviations. However, when using pretty-print, it will always show you the *strict* json form of your input. If we are confusing users, that's bad; but there's some use for the single quotes in our code base. Following a standard would be nice. JSON5 might be "niche", but so what? If we happen to more closely adhere to JSON5 than vanilla JSON, we could still make sure we adhere to it and we get to say that we accept "strict JSON5." This is at least unambiguous. I'm more inclined to head towards JSON5 instead of heading back to strict JSON. --js