gio: Add test for DBus method calls over a UNIX fd pair

Author: sdroege

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;
+    });
+}