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Fri, 05 Dec 2025 03:10:00 -0800 (PST) X-Google-Smtp-Source: AGHT+IF6tqYZ2pxlpF71XpVdcdiacYfGxB79aPZ15tEYIYrtZ4ZJuhCCt9Fbv2r8srbiB0X243zZgw== X-Received: by 2002:a05:600c:4e8a:b0:471:d2f:7987 with SMTP id 5b1f17b1804b1-4792f395ac9mr62402175e9.26.1764933000229; Fri, 05 Dec 2025 03:10:00 -0800 (PST) Received: from [192.168.10.48] ([176.206.119.13]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-47935fce542sm21910995e9.0.2025.12.05.03.09.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Dec 2025 03:09:59 -0800 (PST) Message-ID: <21a2d5fb-0181-4ce8-8bea-a214c8eac2d7@redhat.com> Date: Fri, 5 Dec 2025 12:09:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 11/19] rust/qobject: add from/to JSON bindings for QObject To: Markus Armbruster Cc: qemu-devel@nongnu.org, marcandre.lureau@redhat.com, qemu-rust@nongnu.org References: <20251010151006.791038-1-pbonzini@redhat.com> <20251010151006.791038-12-pbonzini@redhat.com> <875xal5jnv.fsf@pond.sub.org> Content-Language: en-US From: Paolo Bonzini Autocrypt: addr=pbonzini@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 12/5/25 11:04, Markus Armbruster wrote: > Paolo Bonzini writes: > >> These are used by tests. However it could even be an idea to use >> serde_json + transcoding and get rid of the C version... > > Tell me more! QEMU's JSON parser produces a QObject. To obtain the same effect, we can take JSON-string-to-serde deserialization (implemented by serde_json) and attach it to serde-to-QObject serialization (the thing in patch 5). That results in a JSON-string-to-QObject function. Doing it in the other direction (QObject deserializer + JSON-string serializer) produces a QObject-to-JSON-string function. For a little more information see https://serde.rs/transcode.html. Note however that there is no support for push parsing, therefore this would not replace the balanced-parentheses machinery in qobject/json-streamer.c, and therefore QMP would still need a minimal lexer. Grr... I just remembered about interpolation :/ so no, we still need a parser for libqmp.c. Paolo >> Co-authored-by: Marc-André Lureau >> Signed-off-by: Marc-André Lureau >> Signed-off-by: Paolo Bonzini >> --- >> rust/util/wrapper.h | 1 + >> rust/util/src/qobject/mod.rs | 17 +++++++++++++++++ >> 2 files changed, 18 insertions(+) >> >> diff --git a/rust/util/wrapper.h b/rust/util/wrapper.h >> index 0907dd59142..c88820a5e5b 100644 >> --- a/rust/util/wrapper.h >> +++ b/rust/util/wrapper.h >> @@ -37,3 +37,4 @@ typedef enum memory_order { >> #include "qobject/qobject.h" >> #include "qobject/qlist.h" >> #include "qobject/qdict.h" >> +#include "qobject/qjson.h" >> diff --git a/rust/util/src/qobject/mod.rs b/rust/util/src/qobject/mod.rs >> index e896aba5f3a..292a3c9c238 100644 >> --- a/rust/util/src/qobject/mod.rs >> +++ b/rust/util/src/qobject/mod.rs >> @@ -23,6 +23,7 @@ >> use common::assert_field_type; >> pub use deserializer::from_qobject; >> pub use error::{Error, Result}; >> +use foreign::prelude::*; >> pub use serializer::to_qobject; >> >> use crate::bindings; >> @@ -111,6 +112,22 @@ fn refcnt(&self) -> &AtomicUsize { >> let qobj = self.0.get(); >> unsafe { AtomicUsize::from_ptr(addr_of_mut!((*qobj).base.refcnt)) } >> } >> + >> + pub fn to_json(&self) -> String { >> + let qobj = self.0.get(); >> + unsafe { >> + let json = bindings::qobject_to_json(qobj); >> + glib_sys::g_string_free(json, glib_sys::GFALSE).into_native() >> + } >> + } >> + >> + pub fn from_json(json: &str) -> std::result::Result { >> + let c_json = std::ffi::CString::new(json)?; >> + unsafe { >> + crate::Error::with_errp(|errp| bindings::qobject_from_json(c_json.as_ptr(), errp)) >> + .map(|qobj| QObject::from_raw(qobj)) >> + } >> + } >> } >> >> impl From<()> for QObject { > > >