Set up the app structure and the file scanner

music-player/errors.rs

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

music-player/server/Cargo.lock

@@ -165,10 +165,6 @@ dependencies = [
  "syn 1.0.107",
 ]
 
-[[package]]
-name = "errors"
-version = "0.1.0"
-
 [[package]]
 name = "fallible-iterator"
 version = "0.2.0"
@@ -190,6 +186,10 @@ dependencies = [
  "instant",
 ]
 
+[[package]]
+name = "flow"
+version = "0.1.0"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -582,13 +582,14 @@ name = "music-player"
 version = "0.1.0"
 dependencies = [
  "dbus",
- "errors",
+ "flow",
  "mpris",
  "rusqlite",
  "serde",
  "thiserror",
  "tokio",
  "url",
+ "uuid",
  "warp",
 ]
 
@@ -1185,6 +1186,15 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
+[[package]]
+name = "uuid"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1674845326ee10d37ca60470760d4288a6f80f304007d92e5c53bab78c9cfd79"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"

music-player/server/Cargo.toml

@@ -7,13 +7,14 @@ edition = "2021"
 
 [dependencies]
 dbus        = { version = "0.9.7" }
-errors      = { path = "../../errors" }
+flow        = { path = "../../flow" }
 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"
+url         = { version = "2.3" }
+uuid        = { version = "1", features = ["v4"] }
 warp        = { version = "0.3" }
 
 [lib]

music-player/server/src/audio.rs

@@ -92,20 +92,50 @@ impl From<url::ParseError> for AudioError {
     }
 }
 
-#[derive(Clone, Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct Track {
-    pub id: String,
+#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize)]
+pub struct TrackId(String);
+
+impl Default for TrackId {
+    fn default() -> Self {
+        Self(uuid::Uuid::new_v4().as_hyphenated().to_string())
+    }
+}
+
+impl From<String> for TrackId {
+    fn from(id: String) -> Self {
+        Self(id)
+    }
+}
+
+impl AsRef<String> for TrackId {
+    fn as_ref<'a>(&'a self) -> &'a String {
+        &self.0
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct TrackInfo {
     pub track_number: Option<i32>,
     pub name: Option<String>,
     pub album: Option<String>,
     pub artist: Option<String>,
 }
 
+#[derive(Clone, Debug, PartialEq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Track {
+    pub id: TrackId,
+    pub track_number: Option<i32>,
+    pub name: Option<String>,
+    pub album: Option<String>,
+    pub artist: Option<String>,
+}
+
+/*
 impl From<&mpris::Metadata> for Track {
     fn from(data: &mpris::Metadata) -> Self {
         Self {
-            id: data.track_id().unwrap().to_string(),
+            id: data.track_id().unwrap(),
             track_number: data.track_number(),
             name: data.title().map(|s| s.to_owned()),
             album: data.album_name().map(|s| s.to_owned()),
@@ -119,6 +149,7 @@ impl From<mpris::Metadata> for Track {
         Self::from(&data)
     }
 }
+*/
 
 #[derive(Clone, Debug, Serialize)]
 #[serde(rename_all = "camelCase")]

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

@@ -1,7 +1,8 @@
-use std::{io::stdin, path::PathBuf, thread, time::Duration};
+use flow::Flow;
+use std::{io::stdin, path::PathBuf, sync::Arc, thread, time::Duration};
 // use warp::Filter;
 
-use music_player::core::Core;
+use music_player::{core::Core, database::MemoryIndex};
 
 /*
 fn tracks() -> Vec<Track> {
@@ -49,14 +50,14 @@ fn tracks() -> Vec<Track> {
 
 #[tokio::main]
 pub async fn main() {
-    match Core::new(PathBuf::from(":memory:")) {
-        Ok(Ok(core)) => {
+    match Core::new(Arc::new(MemoryIndex::new())) {
+        Flow::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),
+        Flow::Err(err) => println!("non-fatal error: {:?}", err),
+        Flow::Fatal(err) => println!("fatal error: {:?}", err),
     }
 
     /*

music-player/server/src/core.rs

@@ -1,13 +1,33 @@
-use crate::{database::Database, Error, FatalError};
-use errors::{ok, result, Result};
+use crate::{
+    database::{Database, MemoryIndex, MusicIndex},
+    Error, FatalError,
+};
+use flow::{error, fatal, ok, return_error, return_fatal, Flow};
 use std::{
-    path::PathBuf,
-    sync::mpsc::{channel, Receiver, RecvTimeoutError, Sender},
+    path::{Path, PathBuf},
+    sync::{
+        mpsc::{channel, Receiver, RecvTimeoutError, Sender},
+        Arc,
+    },
     thread,
     thread::JoinHandle,
     time::{Duration, Instant},
 };
 
+#[derive(Debug, Error)]
+pub enum ScannerError {
+    #[error("Cannot scan {0}")]
+    CannotScan(PathBuf),
+    #[error("IO error {0}")]
+    IO(std::io::Error),
+}
+
+impl From<std::io::Error> for ScannerError {
+    fn from(err: std::io::Error) -> Self {
+        Self::IO(err)
+    }
+}
+
 pub enum ControlMsg {
     Exit,
 }
@@ -24,7 +44,7 @@ pub enum PlaybackMsg {
 }
 
 pub struct Core {
-    db: Database,
+    db: Arc<dyn MusicIndex>,
     track_handle: JoinHandle<()>,
     track_rx: Receiver<TrackMsg>,
     playback_handle: JoinHandle<()>,
@@ -37,19 +57,26 @@ fn scan_frequency() -> Duration {
 }
 
 pub struct FileScanner {
-    db: Database,
+    db: Arc<dyn MusicIndex>,
     control_rx: Receiver<ControlMsg>,
     tracker_tx: Sender<TrackMsg>,
     next_scan: Instant,
+    music_directories: Vec<PathBuf>,
 }
 
 impl FileScanner {
-    fn new(db: Database, control_rx: Receiver<ControlMsg>, tracker_tx: Sender<TrackMsg>) -> Self {
+    fn new(
+        db: Arc<dyn MusicIndex>,
+        roots: Vec<PathBuf>,
+        control_rx: Receiver<ControlMsg>,
+        tracker_tx: Sender<TrackMsg>,
+    ) -> Self {
         Self {
             db,
             control_rx,
             tracker_tx,
             next_scan: Instant::now(),
+            music_directories: roots,
         }
     }
 
@@ -61,24 +88,66 @@ impl FileScanner {
                 Err(RecvTimeoutError::Disconnected) => return,
             }
             if Instant::now() >= self.next_scan {
-                println!("scan");
+                for root in self.music_directories.iter() {
+                    self.scan_dir(vec![root.clone()]);
+                }
                 self.next_scan = Instant::now() + scan_frequency();
             }
         }
     }
+
+    fn scan_dir(&self, mut paths: Vec<PathBuf>) -> Flow<(), FatalError, ScannerError> {
+        while let Some(dir) = paths.pop() {
+            println!("scanning {:?}", dir);
+            return_error!(self.scan_dir_(&mut paths, dir));
+        }
+        ok(())
+    }
+
+    fn scan_dir_(
+        &self,
+        paths: &mut Vec<PathBuf>,
+        dir: PathBuf,
+    ) -> Flow<(), FatalError, ScannerError> {
+        let dir_iter = return_error!(Flow::from(dir.read_dir().map_err(ScannerError::from)));
+        for entry in dir_iter {
+            match entry {
+                Ok(entry) if entry.path().is_dir() => paths.push(entry.path()),
+                Ok(entry) => {
+                    let _ = return_fatal!(self.scan_file(entry.path()).or_else(|err| {
+                        println!("scan_file failed: {:?}", err);
+                        ok::<(), FatalError, ScannerError>(())
+                    }));
+                    ()
+                }
+                Err(err) => {
+                    println!("scan_dir could not read path: ({:?})", err);
+                }
+            }
+        }
+        ok(())
+    }
+
+    fn scan_file(&self, path: PathBuf) -> Flow<(), FatalError, ScannerError> {
+        ok(())
+    }
 }
 
 impl Core {
-    pub fn new(db_path: PathBuf) -> Result<Core, FatalError, Error> {
-        let db = result!(Database::new(db_path));
-
+    pub fn new(db: Arc<dyn MusicIndex>) -> Flow<Core, FatalError, Error> {
         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();
+                FileScanner::new(
+                    db,
+                    vec![PathBuf::from("/home/savanni/Music/")],
+                    control_rx,
+                    track_tx,
+                )
+                .scan();
             });
             (track_handle, track_rx)
         };

music-player/server/src/database.rs

@@ -1,8 +1,14 @@
-use crate::FatalError;
-use errors::{error, ok, Result};
+use crate::{
+    audio::{Track, TrackId, TrackInfo},
+    FatalError,
+};
+use flow::{error, ok, Flow};
 use rusqlite::Connection;
-use std::path::PathBuf;
-use std::sync::{Arc, Mutex};
+use std::collections::HashMap;
+use std::{
+    path::PathBuf,
+    sync::{Arc, Mutex, RwLock},
+};
 use thiserror::Error;
 
 #[derive(Debug, Error)]
@@ -13,6 +19,57 @@ pub enum DatabaseError {
     UnhandledError(rusqlite::Error),
 }
 
+pub trait MusicIndex: Sync + Send {
+    fn add_track(&mut self, track: &TrackInfo) -> Flow<Track, FatalError, DatabaseError>;
+    fn remove_track(&mut self, id: &TrackId) -> Flow<(), FatalError, DatabaseError>;
+    fn get_track_info(&self, id: &TrackId) -> Flow<Option<Track>, FatalError, DatabaseError>;
+}
+
+pub struct MemoryIndex {
+    tracks: RwLock<HashMap<TrackId, Track>>,
+}
+
+impl MemoryIndex {
+    pub fn new() -> MemoryIndex {
+        MemoryIndex {
+            tracks: RwLock::new(HashMap::default()),
+        }
+    }
+}
+
+impl MusicIndex for MemoryIndex {
+    fn add_track(&mut self, info: &TrackInfo) -> Flow<Track, FatalError, DatabaseError> {
+        let id = TrackId::default();
+        let track = Track {
+            id: id.clone(),
+            track_number: info.track_number,
+            name: info.name.clone(),
+            album: info.album.clone(),
+            artist: info.artist.clone(),
+        };
+        let mut tracks = self.tracks.write().unwrap();
+        tracks.insert(id, track.clone());
+        ok(track)
+    }
+
+    fn remove_track(&mut self, id: &TrackId) -> Flow<(), FatalError, DatabaseError> {
+        let mut tracks = self.tracks.write().unwrap();
+        tracks.remove(&id);
+        ok(())
+    }
+
+    fn get_track_info<'a>(
+        &'a self,
+        id: &TrackId,
+    ) -> Flow<Option<Track>, FatalError, DatabaseError> {
+        let track = {
+            let tracks = self.tracks.read().unwrap();
+            tracks.get(&id).cloned()
+        };
+        ok(track)
+    }
+}
+
 pub struct ManagedConnection<'a> {
     pool: &'a Database,
     conn: Option<Connection>,
@@ -31,7 +88,7 @@ pub struct Database {
 }
 
 impl Database {
-    pub fn new(path: PathBuf) -> Result<Database, FatalError, DatabaseError> {
+    pub fn new(path: PathBuf) -> Flow<Database, FatalError, DatabaseError> {
         let connection = match Connection::open(path.clone()) {
             Ok(connection) => connection,
             Err(err) => return error(DatabaseError::UnhandledError(err)),

music-player/server/src/lib.rs

@@ -16,9 +16,10 @@ impl From<DatabaseError> for Error {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Error)]
 pub enum FatalError {
+    #[error("Unexpected error")]
     UnexpectedError,
 }
 
-impl errors::FatalError for FatalError {}
+impl flow::FatalError for FatalError {}