kpcli: add daemon messaging support

kpcli/src/daemon/mod.rs

@@ -0,0 +1,50 @@
+use anyhow::Result;
+use clap::Subcommand;
+use dbus::blocking::{Connection, Proxy};
+
+const DBUS_NAME: &str = "net.buzzert.kordophonecd";
+const DBUS_PATH: &str = "/net/buzzert/kordophone/Server";
+
+mod dbus_interface {
+    #![allow(unused)]
+    include!(concat!(env!("OUT_DIR"), "/kordophone-client.rs"));
+}
+
+use dbus_interface::NetBuzzertKordophoneServer as KordophoneServer;
+
+#[derive(Subcommand)]
+pub enum Commands {
+    /// Prints the server Kordophone version.
+    Version,
+}
+
+impl Commands {
+    pub async fn run(cmd: Commands) -> Result<()> {
+        let mut client = DaemonCli::new()?;
+        match cmd {
+            Commands::Version => client.print_version().await,
+        }
+    }
+}
+
+struct DaemonCli {
+    conn: Connection,
+}
+
+impl DaemonCli {
+    pub fn new() -> Result<Self> {
+        Ok(Self {
+            conn: Connection::new_session()?
+        })
+    }
+
+    fn proxy(&self) -> Proxy<&Connection> {
+        self.conn.with_proxy(DBUS_NAME, DBUS_PATH, std::time::Duration::from_millis(5000))
+    }
+
+    pub async fn print_version(&mut self) -> Result<()> {
+        let version = KordophoneServer::get_version(&self.proxy())?;
+        println!("Server version: {}", version);
+        Ok(())
+    }
+}