gio: Fix nullability of various DBus method call related parameters

examples/gio_dbus_register_object/main.rs

@@ -40,7 +40,7 @@ enum HelloMethod {
 impl DBusMethodCall for HelloMethod {
     fn parse_call(
         _obj_path: &str,
-        _interface: &str,
+        _interface: Option<&str>,
         method: &str,
         params: glib::Variant,
     ) -> Result<Self, glib::Error> {
@@ -65,7 +65,7 @@ fn on_startup(app: &gio::Application, tx: &Sender<gio::RegistrationId>) {
         .register_object("/com/github/gtk_rs/examples/HelloWorld", &example)
         .typed_method_call::<HelloMethod>()
         .invoke_and_return_future_local(|_, sender, call| {
-            println!("Method call from {sender}");
+            println!("Method call from {sender:?}");
             async {
                 match call {
                     HelloMethod::Hello(Hello { name }) => {

gio/Gir.toml

@@ -644,7 +644,16 @@ status = "generate"
     name = "return_error_literal"
     # glib::ErrorDomain
     manual = true
-
+    [[object.function]]
+    name = "get_sender"
+        [object.function.return]
+        # https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4414
+        nullable = true
+    [[object.function]]
+    name = "get_interface_name"
+        [object.function.return]
+        # https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4414
+        nullable = true
 
 [[object]]
 name = "Gio.DBusProxy"

gio/src/auto/dbus_method_invocation.rs

@@ -33,7 +33,7 @@ impl DBusMethodInvocation {
 
     #[doc(alias = "g_dbus_method_invocation_get_interface_name")]
     #[doc(alias = "get_interface_name")]
-    pub fn interface_name(&self) -> glib::GString {
+    pub fn interface_name(&self) -> Option<glib::GString> {
         unsafe {
             from_glib_none(ffi::g_dbus_method_invocation_get_interface_name(
                 self.to_glib_none().0,
@@ -103,7 +103,7 @@ impl DBusMethodInvocation {
 
     #[doc(alias = "g_dbus_method_invocation_get_sender")]
     #[doc(alias = "get_sender")]
-    pub fn sender(&self) -> glib::GString {
+    pub fn sender(&self) -> Option<glib::GString> {
         unsafe {
             from_glib_none(ffi::g_dbus_method_invocation_get_sender(
                 self.to_glib_none().0,

gio/src/dbus_connection.rs

@@ -11,7 +11,7 @@ use glib::{prelude::*, translate::*};
 pub trait DBusMethodCall: Sized {
     fn parse_call(
         obj_path: &str,
-        interface: &str,
+        interface: Option<&str>,
         method: &str,
         params: glib::Variant,
     ) -> Result<Self, glib::Error>;
@@ -46,7 +46,7 @@ impl<'a, T: DBusMethodCall> MethodCallBuilder<'a, T> {
     /// safer interface where the callback returns a result directly.
     pub fn invoke<F>(self, f: F) -> RegistrationBuilder<'a>
     where
-        F: Fn(DBusConnection, &str, T, DBusMethodInvocation) + 'static,
+        F: Fn(DBusConnection, Option<&str>, T, DBusMethodInvocation) + 'static,
     {
         self.registration.method_call(
             move |connection, sender, obj_path, interface, method, params, invocation| {
@@ -74,7 +74,8 @@ impl<'a, T: DBusMethodCall> MethodCallBuilder<'a, T> {
     /// See [`DBusMethodInvocation::return_result`] for details.
     pub fn invoke_and_return<F>(self, f: F) -> RegistrationBuilder<'a>
     where
-        F: Fn(DBusConnection, &str, T) -> Result<Option<glib::Variant>, glib::Error> + 'static,
+        F: Fn(DBusConnection, Option<&str>, T) -> Result<Option<glib::Variant>, glib::Error>
+            + 'static,
     {
         self.invoke(move |connection, sender, call, invocation| {
             invocation.return_result(f(connection, sender, call))
@@ -97,7 +98,7 @@ impl<'a, T: DBusMethodCall> MethodCallBuilder<'a, T> {
     /// See [`DBusMethodInvocation::return_future_local`] for details.
     pub fn invoke_and_return_future_local<F, Fut>(self, f: F) -> RegistrationBuilder<'a>
     where
-        F: Fn(DBusConnection, &str, T) -> Fut + 'static,
+        F: Fn(DBusConnection, Option<&str>, T) -> Fut + 'static,
         Fut: Future<Output = Result<Option<glib::Variant>, glib::Error>> + 'static,
     {
         self.invoke(move |connection, sender, call, invocation| {
@@ -128,18 +129,37 @@ pub struct RegistrationBuilder<'a> {
     interface_info: &'a DBusInterfaceInfo,
     #[allow(clippy::type_complexity)]
     method_call: Option<
-        Box_<dyn Fn(DBusConnection, &str, &str, &str, &str, glib::Variant, DBusMethodInvocation)>,
+        Box_<
+            dyn Fn(
+                DBusConnection,
+                Option<&str>,
+                &str,
+                Option<&str>,
+                &str,
+                glib::Variant,
+                DBusMethodInvocation,
+            ),
+        >,
     >,
     #[allow(clippy::type_complexity)]
-    get_property: Option<Box_<dyn Fn(DBusConnection, &str, &str, &str, &str) -> glib::Variant>>,
+    get_property:
+        Option<Box_<dyn Fn(DBusConnection, Option<&str>, &str, &str, &str) -> glib::Variant>>,
     #[allow(clippy::type_complexity)]
     set_property:
-        Option<Box_<dyn Fn(DBusConnection, &str, &str, &str, &str, glib::Variant) -> bool>>,
+        Option<Box_<dyn Fn(DBusConnection, Option<&str>, &str, &str, &str, glib::Variant) -> bool>>,
 }
 
 impl<'a> RegistrationBuilder<'a> {
     pub fn method_call<
-        F: Fn(DBusConnection, &str, &str, &str, &str, glib::Variant, DBusMethodInvocation) + 'static,
+        F: Fn(
+                DBusConnection,
+                Option<&str>,
+                &str,
+                Option<&str>,
+                &str,
+                glib::Variant,
+                DBusMethodInvocation,
+            ) + 'static,
     >(
         mut self,
         f: F,
@@ -162,7 +182,9 @@ impl<'a> RegistrationBuilder<'a> {
     }
 
     #[doc(alias = "get_property")]
-    pub fn property<F: Fn(DBusConnection, &str, &str, &str, &str) -> glib::Variant + 'static>(
+    pub fn property<
+        F: Fn(DBusConnection, Option<&str>, &str, &str, &str) -> glib::Variant + 'static,
+    >(
         mut self,
         f: F,
     ) -> Self {
@@ -171,7 +193,7 @@ impl<'a> RegistrationBuilder<'a> {
     }
 
     pub fn set_property<
-        F: Fn(DBusConnection, &str, &str, &str, &str, glib::Variant) -> bool + 'static,
+        F: Fn(DBusConnection, Option<&str>, &str, &str, &str, glib::Variant) -> bool + 'static,
     >(
         mut self,
         f: F,
@@ -191,9 +213,9 @@ impl<'a> RegistrationBuilder<'a> {
                     .map(|f| {
                         glib::Closure::new_local(move |args| {
                             let conn = args[0].get::<DBusConnection>().unwrap();
-                            let sender = args[1].get::<&str>().unwrap();
+                            let sender = args[1].get::<Option<&str>>().unwrap();
                             let object_path = args[2].get::<&str>().unwrap();
-                            let interface_name = args[3].get::<&str>().unwrap();
+                            let interface_name = args[3].get::<Option<&str>>().unwrap();
                             let method_name = args[4].get::<&str>().unwrap();
                             let parameters = args[5].get::<glib::Variant>().unwrap();
                             let invocation = args[6].get::<DBusMethodInvocation>().unwrap();
@@ -215,7 +237,7 @@ impl<'a> RegistrationBuilder<'a> {
                     .map(|f| {
                         glib::Closure::new_local(move |args| {
                             let conn = args[0].get::<DBusConnection>().unwrap();
-                            let sender = args[1].get::<&str>().unwrap();
+                            let sender = args[1].get::<Option<&str>>().unwrap();
                             let object_path = args[2].get::<&str>().unwrap();
                             let interface_name = args[3].get::<&str>().unwrap();
                             let property_name = args[4].get::<&str>().unwrap();
@@ -237,7 +259,7 @@ impl<'a> RegistrationBuilder<'a> {
                     .map(|f| {
                         glib::Closure::new_local(move |args| {
                             let conn = args[0].get::<DBusConnection>().unwrap();
-                            let sender = args[1].get::<&str>().unwrap();
+                            let sender = args[1].get::<Option<&str>>().unwrap();
                             let object_path = args[2].get::<&str>().unwrap();
                             let interface_name = args[3].get::<&str>().unwrap();
                             let property_name = args[4].get::<&str>().unwrap();

gio/tests/dbus_peer.rs

@@ -0,0 +1,157 @@
+// Take a look at the license at the top of the repository in the LICENSE file.
+
+#[cfg(unix)]
+#[test]
+fn test_gdbus_peer_connection() {
+    use gio::{
+        glib::{self, VariantTy},
+        prelude::*,
+        DBusConnection, DBusConnectionFlags, DBusNodeInfo, Socket,
+    };
+    use std::os::{fd::IntoRawFd, unix::net::UnixStream};
+
+    const EXAMPLE_XML: &str = r#"
+  <node>
+    <interface name='com.github.gtk_rs'>
+      <method name='Hello'>
+        <arg type='s' name='name' direction='in'/>
+        <arg type='s' name='greet' direction='out'/>
+      </method>
+    </interface>
+  </node>
+"#;
+
+    pub async fn spawn_server(fd: UnixStream) -> DBusConnection {
+        let socket = unsafe { Socket::from_fd(fd.into_raw_fd()) }.unwrap();
+        let socket_connection = socket.connection_factory_create_connection();
+
+        let guid = gio::dbus_generate_guid();
+
+        dbg!("server connecting");
+
+        let connection = DBusConnection::new_future(
+            &socket_connection,
+            Some(&guid),
+            DBusConnectionFlags::AUTHENTICATION_SERVER
+                .union(DBusConnectionFlags::DELAY_MESSAGE_PROCESSING),
+            None,
+        )
+        .await
+        .unwrap();
+
+        dbg!("server connected");
+
+        let interface_info = DBusNodeInfo::for_xml(EXAMPLE_XML)
+            .unwrap()
+            .lookup_interface("com.github.gtk_rs")
+            .unwrap();
+
+        let _id = connection
+            .register_object("/com/github/gtk_rs", &interface_info)
+            .method_call(
+                |_connection,
+                 _sender,
+                 _object_path,
+                 _interface_name,
+                 _method_name,
+                 parameters,
+                 invocation| {
+                    dbg!(
+                        _sender,
+                        _object_path,
+                        _interface_name,
+                        _method_name,
+                        &parameters,
+                        &invocation
+                    );
+
+                    let name = parameters.child_get::<String>(0);
+                    invocation.return_value(Some(&(format!("Hello {name}!"),).to_variant()));
+                },
+            )
+            .build()
+            .unwrap();
+
+        dbg!("server starts message processing");
+
+        connection.start_message_processing();
+
+        dbg!("server awaiting calls");
+
+        connection
+    }
+
+    pub async fn spawn_client(fd: UnixStream) -> DBusConnection {
+        let socket_client = unsafe { Socket::from_fd(fd.into_raw_fd()) }.unwrap();
+        let socket_connection_client = socket_client.connection_factory_create_connection();
+
+        dbg!("client connecting");
+
+        let connection = DBusConnection::new_future(
+            &socket_connection_client,
+            None,
+            DBusConnectionFlags::AUTHENTICATION_CLIENT,
+            None,
+        )
+        .await
+        .unwrap();
+
+        dbg!("client connected");
+
+        connection
+    }
+
+    let ctx = glib::MainContext::default();
+
+    let (x, y) = std::os::unix::net::UnixStream::pair().unwrap();
+
+    x.set_nonblocking(true).unwrap();
+    y.set_nonblocking(true).unwrap();
+
+    ctx.block_on(async move {
+        let ctx = glib::MainContext::default();
+
+        let server = ctx.spawn_local(spawn_server(x));
+        let client = ctx.spawn_local(spawn_client(y));
+
+        let server = server.await.unwrap();
+        let client = client.await.unwrap();
+
+        dbg!("calling method");
+
+        let result = client
+            .call_future(
+                None,
+                "/com/github/gtk_rs",
+                "com.github.gtk_rs",
+                "Hello",
+                Some(&("World",).into()),
+                Some(VariantTy::new("(s)").unwrap()),
+                gio::DBusCallFlags::NONE,
+                10000,
+            )
+            .await
+            .unwrap();
+
+        dbg!("method called");
+
+        dbg!(&result);
+
+        dbg!("closing client");
+        client.close_future().await.unwrap();
+        dbg!("closed client, closing server");
+        server.close_future().await.unwrap();
+        dbg!("closed server");
+
+        drop(client);
+        drop(server);
+
+        assert_eq!(result.child_get::<String>(0), "Hello World!");
+
+        glib::timeout_future_with_priority(
+            glib::Priority::LOW,
+            std::time::Duration::from_millis(50),
+        )
+        .await;
+    });
+}