marcelbuesing / dbus-rs

D-Bus binding for the Rust language

A D-Bus binding for Rust.

Current state of the dbus crate: Slowly maturing. Most stuff you need should be working:

• Connect to system or session bus
• Messages send/receive (method calls, method returns, signals, errors)
• Message get/append arguments (through either generics, trait objects or enums), all types (including Unix Fd). See argument guide.
• Build server side trees, with introspection and method dispatch (boxed closures)
• Properties, on both client and server sides (set/get/getall methods, signals)
• Optional async API (for poll-based mainloops, e g mio)

API Documentation is here. If you have further questions or comments, filing an issue with your question is fine.

Additional crates

• libdbus-sys contains the raw FFI bindings to libdbus.
• dbus-codegen installs a binary tool which generates Rust code from D-Bus XML introspection data.
• dbus-tokio integrates D-Bus with Tokio.

All these crates are less tested and less mature than the main "dbus" crate.

Examples

Client

This example opens a connection to the session bus and asks for a list of all names currently present.

let c = Connection::get_private(BusType::Session)?;
let m = Message::new_method_call("org.freedesktop.DBus", "/", "org.freedesktop.DBus", "ListNames")?;
let r = c.send_with_reply_and_block(m, 2000)?;
let arr: Array<&str, _>  = r.get1()?;
for name in arr { println!("{}", name); }

You can try a similar example by running:

cargo run --example client

Server

This example grabs the com.example.dbustest bus name, registers the /hello path and adds a method which returns a string. It then listens for incoming D-Bus events and handles them accordingly.

let c = Connection::get_private(BusType::Session)?;
c.register_name("com.example.dbustest", NameFlag::ReplaceExisting as u32)?;
let f = Factory::new_fn::<()>();
let tree = f.tree(()).add(f.object_path("/hello", ()).introspectable().add(
    f.interface("com.example.dbustest", ()).add_m(
        f.method("Hello", (), |m| {
            let n: &str = m.msg.read1()?;
            let s = format!("Hello {}!", n);
            Ok(vec!(m.msg.method_return().append1(s)))
        }).inarg::<&str,_>("name")
          .outarg::<&str,_>("reply")
    )
));
tree.set_registered(&c, true)?;
c.add_handler(tree);
loop { c.incoming(1000).next(); }

You can try a similar example (which has more comments) by running:

cargo run --example server

Or a more advanced server example:

cargo run --example adv_server

Properties

There are two examples of getting properties in the examples directory, one which uses the newer arg style and one that uses the older MessageItem style. See:

cargo run --example properties
cargo run --example properties_msgitem

For an extended example, which also uses non-panicking error handling, see

examples/rtkit.rs

Requirements

Libdbus 1.6 or higher, and latest stable release of Rust. If you run Ubuntu, this translates to Ubuntu 14.04 or later, having the libdbus-1-dev package installed while building, and the libdbus-1-3 package installed while running.

However, if you enable the feature no-string-validation, you might be able to build and run with older versions of the D-Bus library. This feature skips an extra check that a specific string (e g a Path, ErrorName etc) conforms to the D-Bus specification, which might also make things a tiny bit faster. But - if you do so, and then actually send invalid strings to the D-Bus library, you might get a panic instead of a proper error.

License

Apache 2.0 / MIT dual licensed.