Add basic logging and dbus functionality to sfsmcd

sfsmcd/src/main.rs

@@ -0,0 +1,58 @@
+use log::{ debug, info, warn, error };
+use dbus_crossroads::Crossroads;
+use dbus::{
+    message::MatchRule,
+    channel::MatchingReceiver
+};
+
+const DBUS_NAME: &'static str = "org.ddnss.sfs.mc";
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // env_logger initialization
+    // If running with debug profile and `RUST_LOG` environment variable isn't set, set it to "debug"
+    if cfg!(debug_assertions) && std::env::var_os(env_logger::DEFAULT_FILTER_ENV).is_none() {
+        std::env::set_var(env_logger::DEFAULT_FILTER_ENV, "debug");
+    }
+    env_logger::init();
+
+    // New Crossroads instance
+    let mut cr = Crossroads::new();
+
+    // Insert object paths
+    cr.insert("/", &[], ());
+
+    // Connect with D-Bus
+    let (resource, c) = dbus_tokio::connection::new_session_sync()?;
+    debug!("D-Bus unique name: {}", c.unique_name());
+
+    // Spawn a new task for the D-Bus resource
+    tokio::spawn(async move {
+        let err = resource.await;
+        panic!("Lost connection to D-Bus: {}", err);
+    });
+
+    // Allow methods to be async
+    cr.set_async_support(Some((c.clone(), Box::new(|x| { tokio::spawn(x); }))));
+
+    // Aquire name on D-Bus
+    match c.request_name(DBUS_NAME, false, true, false).await {
+        Ok(_) => debug!("D-Bus name: {}", DBUS_NAME),
+        Err(err) => {
+            error!("Couldn't request name on D-Bus: {}", err);
+            return Err(err.into());
+        }
+    };
+
+    // Receive method calls
+    c.start_receive(MatchRule::new_method_call(), Box::new(move |msg, conn| {
+        cr.handle_message(msg, conn).unwrap_or_else(|_| warn!("Incoming message wasn't a method call"));
+        // Return bool whether message should be handled only once (false) or another time (true)
+        true
+    }));
+
+    // Will (afaik) be stabilized in Rust 1.46
+    // core::future::pending::<()>().await;
+    loop {};
+    unreachable!();
+}