Split into multiple crates

crates/musicus_backend/src/lib.rs

@@ -0,0 +1,116 @@
+use futures_channel::mpsc;
+use gio::prelude::*;
+use std::cell::RefCell;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+pub use musicus_client::*;
+pub use musicus_database::*;
+
+pub mod error;
+pub use error::*;
+
+// Override the identically named types from the other crates.
+pub use error::{Error, Result};
+
+pub mod library;
+pub use library::*;
+
+pub mod player;
+pub use player::*;
+
+mod secure;
+
+/// General states the application can be in.
+pub enum BackendState {
+    /// The backend is not set up yet. This means that no backend methods except for setting the
+    /// music library path should be called. The user interface should adapt and only present this
+    /// option.
+    NoMusicLibrary,
+
+    /// The backend is loading the music library. No methods should be called. The user interface
+    /// should represent that state by prohibiting all interaction.
+    Loading,
+
+    /// The backend is ready and all methods may be called.
+    Ready,
+}
+
+/// A collection of all backend state and functionality.
+pub struct Backend {
+    pub state_stream: RefCell<mpsc::Receiver<BackendState>>,
+    state_sender: RefCell<mpsc::Sender<BackendState>>,
+    settings: gio::Settings,
+    music_library_path: RefCell<Option<PathBuf>>,
+    database: RefCell<Option<Rc<DbThread>>>,
+    player: RefCell<Option<Rc<Player>>>,
+    client: Client,
+}
+
+impl Backend {
+    /// Create a new backend initerface. The user interface should subscribe to the state stream
+    /// and call init() afterwards.
+    pub fn new() -> Self {
+        let (state_sender, state_stream) = mpsc::channel(1024);
+
+        Backend {
+            state_stream: RefCell::new(state_stream),
+            state_sender: RefCell::new(state_sender),
+            settings: gio::Settings::new("de.johrpan.musicus"),
+            music_library_path: RefCell::new(None),
+            database: RefCell::new(None),
+            player: RefCell::new(None),
+            client: Client::new(),
+        }
+    }
+
+    /// Initialize the backend updating the state accordingly.
+    pub async fn init(self: Rc<Backend>) -> Result<()> {
+        self.init_library().await?;
+
+        if let Some(url) = self.settings.get_string("server-url") {
+            if !url.is_empty() {
+                self.client.set_server_url(&url);
+            }
+        }
+
+        if let Some(data) = secure::load_login_data()? {
+            self.client.set_login_data(data);
+        }
+
+        Ok(())
+    }
+
+    /// Set the URL of the Musicus server to connect to.
+    pub fn set_server_url(&self, url: &str) -> Result<()> {
+        self.settings.set_string("server-url", url)?;
+        self.client.set_server_url(url);
+        Ok(())
+    }
+
+    /// Get the currently set server URL.
+    pub fn get_server_url(&self) -> Option<String> {
+        self.client.get_server_url()
+    }
+
+    /// Set the user credentials to use.
+    pub async fn set_login_data(&self, data: LoginData) -> Result<()> {
+        secure::store_login_data(data.clone()).await?;
+        self.client.set_login_data(data);
+        Ok(())
+    }
+
+    pub fn cl(&self) -> &Client {
+        &self.client
+    }
+
+    /// Get the currently stored login credentials.
+    pub fn get_login_data(&self) -> Option<LoginData> {
+        self.client.get_login_data()
+    }
+
+    /// Set the current state and notify the user interface.
+    fn set_state(&self, state: BackendState) {
+        self.state_sender.borrow_mut().try_send(state).unwrap();
+    }
+}