Start setting up the scanning loop

errors/src/lib.rs

@@ -16,3 +16,14 @@ pub fn error<A, FE: FatalError, E: Error>(err: E) -> Result<A, FE, E> {
 pub fn fatal<A, FE: FatalError, E: Error>(err: FE) -> Result<A, FE, E> {
     Err(err)
 }
+
+#[macro_export]
+macro_rules! result {
+    ($x:expr) => {
+        match $x {
+            Ok(Ok(val)) => val,
+            Ok(Err(err)) => return Ok(Err(err.into())),
+            Err(err) => return Err(err),
+        }
+    };
+}

flake.nix

@@ -26,18 +26,19 @@
           name = "ld-tools-devshell";
           buildInputs = [
             pkgs.clang
+            pkgs.dbus
+            pkgs.entr
             pkgs.glib
-            pkgs.gst_all_1.gstreamer
+            pkgs.gst_all_1.gst-plugins-bad
             pkgs.gst_all_1.gst-plugins-base
             pkgs.gst_all_1.gst-plugins-good
-            pkgs.gst_all_1.gst-plugins-bad
             pkgs.gst_all_1.gst-plugins-ugly
-            pkgs.pipewire
-            pkgs.openssl
-            pkgs.pkg-config
+            pkgs.gst_all_1.gstreamer
             pkgs.nodejs
-            pkgs.entr
-            pkgs.dbus
+            pkgs.openssl
+            pkgs.pipewire
+            pkgs.pkg-config
+            pkgs.sqlite
             rust
           ];
           LIBCLANG_PATH="${pkgs.llvmPackages.libclang.lib}/lib";

music-player/errors.rs

@@ -0,0 +1,7 @@
+pub use error::{error, fatal, ok, Result};
+
+pub enum FatalError {
+    UnexpectedError,
+}
+
+impl error::FatalError for FatalError {}

music-player/server/Cargo.lock

@@ -2,6 +2,17 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -158,6 +169,18 @@ dependencies = [
 name = "errors"
 version = "0.1.0"
 
+[[package]]
+name = "fallible-iterator"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
+
+[[package]]
+name = "fallible-streaming-iterator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
+
 [[package]]
 name = "fastrand"
 version = "1.8.0"
@@ -290,6 +313,18 @@ name = "hashbrown"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash",
+]
+
+[[package]]
+name = "hashlink"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69fe1fcf8b4278d860ad0548329f892a3631fb63f82574df68275f34cdbe0ffa"
+dependencies = [
+ "hashbrown",
+]
 
 [[package]]
 name = "headers"
@@ -448,6 +483,16 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "libsqlite3-sys"
+version = "0.25.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29f835d03d717946d28b1d1ed632eb6f0e24a299388ee623d0c23118d3e8a7fa"
+dependencies = [
+ "pkg-config",
+ "vcpkg",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -539,9 +584,11 @@ dependencies = [
  "dbus",
  "errors",
  "mpris",
+ "rusqlite",
  "serde",
  "thiserror",
  "tokio",
+ "url",
  "warp",
 ]
 
@@ -712,6 +759,20 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "rusqlite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01e213bc3ecb39ac32e81e51ebe31fd888a940515173e3a18a35f8c6e896422a"
+dependencies = [
+ "bitflags",
+ "fallible-iterator",
+ "fallible-streaming-iterator",
+ "hashlink",
+ "libsqlite3-sys",
+ "smallvec",
+]
+
 [[package]]
 name = "rustls-pemfile"
 version = "0.2.1"
@@ -1124,6 +1185,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
+[[package]]
+name = "vcpkg"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"

music-player/server/Cargo.toml

@@ -9,9 +9,11 @@ edition = "2021"
 dbus        = { version = "0.9.7" }
 errors      = { path = "../../errors" }
 mpris       = { version = "2.0" }
+rusqlite    = { version = "0.28" }
 serde       = { version = "1.0", features = ["derive"] }
 thiserror   = { version = "1.0" }
 tokio       = { version = "1.24", features = ["full"] }
+url = "2.3.1"
 warp        = { version = "0.3" }
 
 [lib]

music-player/server/src/audio.rs

@@ -69,6 +69,9 @@ pub enum AudioError {
 
     #[error("Unknown problem with mpris")]
     MprisError(mpris::DBusError),
+
+    #[error("url parse error {0}")]
+    UrlError(url::ParseError),
 }
 
 impl From<dbus::Error> for AudioError {
@@ -83,9 +86,16 @@ impl From<mpris::DBusError> for AudioError {
     }
 }
 
+impl From<url::ParseError> for AudioError {
+    fn from(err: url::ParseError) -> Self {
+        Self::UrlError(err)
+    }
+}
+
 #[derive(Clone, Debug, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Track {
+    pub id: String,
     pub track_number: Option<i32>,
     pub name: Option<String>,
     pub album: Option<String>,
@@ -95,6 +105,7 @@ pub struct Track {
 impl From<&mpris::Metadata> for Track {
     fn from(data: &mpris::Metadata) -> Self {
         Self {
+            id: data.track_id().unwrap().to_string(),
             track_number: data.track_number(),
             name: data.title().map(|s| s.to_owned()),
             album: data.album_name().map(|s| s.to_owned()),
@@ -134,9 +145,33 @@ pub struct Capabilities {
 pub trait AudioPlayer {
     fn capabilities(&self) -> Result<Capabilities, AudioError>;
     fn state(&self) -> Result<State, AudioError>;
+    fn play(&self, trackid: url::Url) -> Result<State, AudioError>;
     fn play_pause(&self) -> Result<State, AudioError>;
 }
 
+pub struct GStreamerPlayer {
+    url: url::Url,
+}
+
+impl AudioPlayer for GStreamerPlayer {
+    fn capabilities(&self) -> Result<Capabilities, AudioError> {
+        unimplemented!()
+    }
+
+    fn state(&self) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+
+    fn play(&self, trackid: url::Url) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+
+    fn play_pause(&self) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+}
+
+/*
 pub struct MprisDevice {
     device_id: String,
     player: Player,
@@ -153,7 +188,7 @@ impl MprisDevice {
         })
     }
 
-    pub fn run(&mut self, control_channel: Receiver<Message>) {
+    pub fn monitor(&mut self, control_channel: Receiver<Message>) {
         let (tx, rx) = channel();
         {
             let device_id = self.device_id.clone();
@@ -226,7 +261,17 @@ impl AudioPlayer for MprisDevice {
         unimplemented!("AudioPlayer state")
     }
 
+    fn play(&self, track_id: String) -> Result<State, AudioError> {
+        println!("playing: {}", track_id);
+        self.player
+            .go_to(&mpris::TrackID::from(dbus::Path::from(track_id)))?;
+        self.player.play();
+        Ok(State::Stopped)
+    }
+
     fn play_pause(&self) -> Result<State, AudioError> {
-        unimplemented!("Audioplayer play/pause command")
+        self.player.play_pause()?;
+        Ok(State::Stopped)
     }
 }
+*/

music-player/server/src/bin/server.rs

@@ -1,10 +1,7 @@
-use dbus::ffidisp::Connection;
-use serde::Serialize;
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
-use std::path::PathBuf;
-use warp::Filter;
+use std::{io::stdin, path::PathBuf, thread, time::Duration};
+// use warp::Filter;
 
-pub mod audio;
+use music_player::core::Core;
 
 /*
 fn tracks() -> Vec<Track> {
@@ -52,6 +49,16 @@ fn tracks() -> Vec<Track> {
 
 #[tokio::main]
 pub async fn main() {
+    match Core::new(PathBuf::from(":memory:")) {
+        Ok(Ok(core)) => {
+            let mut buf = String::new();
+            let _ = stdin().read_line(&mut buf).unwrap();
+            core.exit();
+        }
+        Ok(Err(err)) => println!("non-fatal error: {:?}", err),
+        Err(err) => println!("fatal error: {:?}", err),
+    }
+
     /*
     let connection = Connection::new_session().expect("to connect to dbus");
 

music-player/server/src/core.rs

@@ -1,45 +1,110 @@
-use dbus::ffidisp::Connection;
-use mpris::{Player, PlayerFinder};
+use crate::{database::Database, Error, FatalError};
+use errors::{ok, result, Result};
+use std::{
+    path::PathBuf,
+    sync::mpsc::{channel, Receiver, RecvTimeoutError, Sender},
+    thread,
+    thread::JoinHandle,
+    time::{Duration, Instant},
+};
 
-#[derive(Clone, Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct Device {
-    dbus_name: String,
-    name: String,
+pub enum ControlMsg {
+    Exit,
+}
+
+pub enum TrackMsg {
+    DbUpdate,
+}
+
+pub enum PlaybackMsg {
+    PositionUpdate,
+    Playing,
+    Pausing,
+    Stopping,
 }
 
 pub struct Core {
-    conn: Connection,
-    player: Player,
+    db: Database,
+    track_handle: JoinHandle<()>,
+    track_rx: Receiver<TrackMsg>,
+    playback_handle: JoinHandle<()>,
+    playback_rx: Receiver<PlaybackMsg>,
+    control_tx: Sender<ControlMsg>,
+}
+
+fn scan_frequency() -> Duration {
+    Duration::from_secs(60)
+}
+
+pub struct FileScanner {
+    db: Database,
+    control_rx: Receiver<ControlMsg>,
+    tracker_tx: Sender<TrackMsg>,
+    next_scan: Instant,
+}
+
+impl FileScanner {
+    fn new(db: Database, control_rx: Receiver<ControlMsg>, tracker_tx: Sender<TrackMsg>) -> Self {
+        Self {
+            db,
+            control_rx,
+            tracker_tx,
+            next_scan: Instant::now(),
+        }
+    }
+
+    fn scan(&mut self) {
+        loop {
+            match self.control_rx.recv_timeout(Duration::from_millis(100)) {
+                Ok(ControlMsg::Exit) => return,
+                Err(RecvTimeoutError::Timeout) => (),
+                Err(RecvTimeoutError::Disconnected) => return,
+            }
+            if Instant::now() >= self.next_scan {
+                println!("scan");
+                self.next_scan = Instant::now() + scan_frequency();
+            }
+        }
+    }
 }
 
 impl Core {
-    fn new(&self) -> Result<Core, Error> {
-        let conn = Connection::new_session()?;
-        Ok(Core {
-            conn,
-            player: mpris::Player::new(conn, ":1.6".to_owned(), 1000)?,
+    pub fn new(db_path: PathBuf) -> Result<Core, FatalError, Error> {
+        let db = result!(Database::new(db_path));
+
+        let (control_tx, control_rx) = channel::<ControlMsg>();
+
+        let (track_handle, track_rx) = {
+            let (track_tx, track_rx) = channel();
+            let db = db.clone();
+            let track_handle = thread::spawn(move || {
+                FileScanner::new(db, control_rx, track_tx).scan();
+            });
+            (track_handle, track_rx)
+        };
+
+        let (playback_handle, playback_rx) = {
+            let (playback_tx, playback_rx) = channel();
+            let playback_handle = thread::spawn(move || {});
+            (playback_handle, playback_rx)
+        };
+
+        ok(Core {
+            db,
+            track_handle,
+            track_rx,
+            playback_handle,
+            playback_rx,
+            control_tx,
         })
     }
 
-    fn list_devices(&self) -> Result<Vec<Device>, Error> {
-        mpris::PlayerFinder::for_connection(conn)
-            .find_all()?
-            .into_iter()
-            .map(|player| Device {
-                dbus_name: player.unique_name().to_owned(),
-                name: player.identity().to_owned(),
-            })
-            .collect()
-    }
-
-    fn list_tracks(&self) -> Result<Vec<String>, Error> {
-        self.player
-            .get_track_list()?
-            .ids()
-            .into_iter()
-            .map(|id| id.as_str().to_owned())
-            .collect()
+    pub fn exit(&self) {
+        let _ = self.control_tx.send(ControlMsg::Exit);
+        /*
+        self.track_handle.join();
+        self.playback_handle.join();
+        */
     }
 }
 

music-player/server/src/database.rs

@@ -0,0 +1,49 @@
+use crate::FatalError;
+use errors::{error, ok, Result};
+use rusqlite::Connection;
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum DatabaseError {
+    #[error("database is unreadable")]
+    DatabaseUnreadable,
+    #[error("unhandled database problem: {0}")]
+    UnhandledError(rusqlite::Error),
+}
+
+pub struct ManagedConnection<'a> {
+    pool: &'a Database,
+    conn: Option<Connection>,
+}
+
+impl<'a> Drop for ManagedConnection<'a> {
+    fn drop(&mut self) {
+        self.pool.r(self.conn.take().unwrap());
+    }
+}
+
+#[derive(Clone)]
+pub struct Database {
+    path: PathBuf,
+    pool: Arc<Mutex<Vec<Connection>>>,
+}
+
+impl Database {
+    pub fn new(path: PathBuf) -> Result<Database, FatalError, DatabaseError> {
+        let connection = match Connection::open(path.clone()) {
+            Ok(connection) => connection,
+            Err(err) => return error(DatabaseError::UnhandledError(err)),
+        };
+        ok(Database {
+            path,
+            pool: Arc::new(Mutex::new(vec![connection])),
+        })
+    }
+
+    pub fn r(&self, conn: Connection) {
+        let mut pool = self.pool.lock().unwrap();
+        pool.push(conn);
+    }
+}

music-player/server/src/lib.rs

@@ -1 +1,24 @@
 pub mod audio;
+pub mod core;
+pub mod database;
+use database::DatabaseError;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Database error: {0}")]
+    DatabaseError(DatabaseError),
+}
+
+impl From<DatabaseError> for Error {
+    fn from(err: DatabaseError) -> Self {
+        Self::DatabaseError(err)
+    }
+}
+
+#[derive(Debug)]
+pub enum FatalError {
+    UnexpectedError,
+}
+
+impl errors::FatalError for FatalError {}