[PATCH v2 07/16] rust/qobject: add from/to JSON bindings for QObject

Paolo Bonzini
2026-01-08T13:12:23Z

These are used by tests. However it could even be an idea to use
serde_json + transcoding and get rid of the C version...

Co-authored-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
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 b95dddddedc..95d41cec4f1 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;
@@ -112,6 +113,22 @@ 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<Self, crate::Error> {
+ 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))
+ }
+ }
}

/// Rust equivalent of the C `QOBJECT` macro; for internal use only, because
--
2.52.0