Set up the app structure and the file scanner

errors/Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "errors"
-version = "0.1.0"

errors/src/lib.rs

@@ -1,18 +0,0 @@
-use std::error::Error;
-use std::result;
-
-pub trait FatalError {}
-
-pub type Result<A, FE, E> = result::Result<result::Result<A, E>, FE>;
-
-pub fn ok<A, FE: FatalError, E: Error>(val: A) -> Result<A, FE, E> {
-    Ok(Ok(val))
-}
-
-pub fn error<A, FE: FatalError, E: Error>(err: E) -> Result<A, FE, E> {
-    Ok(Err(err))
-}
-
-pub fn fatal<A, FE: FatalError, E: Error>(err: FE) -> Result<A, FE, E> {
-    Err(err)
-}

flake.nix

@@ -26,12 +26,19 @@
           name = "ld-tools-devshell";
           buildInputs = [
             pkgs.clang
-            pkgs.pipewire
-            pkgs.openssl
-            pkgs.pkg-config
-            pkgs.nodejs
-            pkgs.entr
             pkgs.dbus
+            pkgs.entr
+            pkgs.glib
+            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-ugly
+            pkgs.gst_all_1.gstreamer
+            pkgs.nodejs
+            pkgs.openssl
+            pkgs.pipewire
+            pkgs.pkg-config
+            pkgs.sqlite
             rust
           ];
           LIBCLANG_PATH="${pkgs.llvmPackages.libclang.lib}/lib";

flow/Cargo.lock

@@ -0,0 +1,65 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "flow"
+version = "0.1.0"
+dependencies = [
+ "thiserror",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.107"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a9cd18aa97d5c45c6603caea1da6628790b37f7a34b6ca89522331c5180fed0"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fb327af4685e4d03fa8cbcf1716380da910eeb2bb8be417e7f9fd3fb164f36f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"

flow/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "flow"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[dev-dependencies]
+thiserror = "1"

flow/src/lib.rs

@@ -0,0 +1,217 @@
+use std::error::Error;
+
+pub trait FatalError: Error {}
+
+pub enum Flow<A, FE, E> {
+    Ok(A),
+    Fatal(FE),
+    Err(E),
+}
+
+impl<A, FE, E> Flow<A, FE, E> {
+    pub fn map<B, O>(self, mapper: O) -> Flow<B, FE, E>
+    where
+        O: FnOnce(A) -> B,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(mapper(val)),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(err),
+        }
+    }
+
+    pub fn and_then<B, O>(self, handler: O) -> Flow<B, FE, E>
+    where
+        O: FnOnce(A) -> Flow<B, FE, E>,
+    {
+        match self {
+            Flow::Ok(val) => handler(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(err),
+        }
+    }
+
+    pub fn map_err<F, O>(self, mapper: O) -> Flow<A, FE, F>
+    where
+        O: FnOnce(E) -> F,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(mapper(err)),
+        }
+    }
+
+    pub fn or_else<O, F>(self, handler: O) -> Flow<A, FE, F>
+    where
+        O: FnOnce(E) -> Flow<A, FE, F>,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => handler(err),
+        }
+    }
+}
+
+impl<A, FE, E> From<Result<A, E>> for Flow<A, FE, E> {
+    fn from(r: Result<A, E>) -> Self {
+        match r {
+            Ok(val) => Flow::Ok(val),
+            Err(err) => Flow::Err(err),
+        }
+    }
+}
+
+pub fn ok<A, FE: FatalError, E: Error>(val: A) -> Flow<A, FE, E> {
+    Flow::Ok(val)
+}
+
+pub fn error<A, FE: FatalError, E: Error>(err: E) -> Flow<A, FE, E> {
+    Flow::Err(err)
+}
+
+pub fn fatal<A, FE: FatalError, E: Error>(err: FE) -> Flow<A, FE, E> {
+    Flow::Fatal(err)
+}
+
+#[macro_export]
+macro_rules! return_fatal {
+    ($x:expr) => {
+        match $x {
+            Flow::Fatal(err) => return Flow::Fatal(err),
+            Flow::Err(err) => Err(err),
+            Flow::Ok(val) => Ok(val),
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! return_error {
+    ($x:expr) => {
+        match $x {
+            Flow::Ok(val) => val,
+            Flow::Err(err) => return Flow::Err(err),
+            Flow::Fatal(err) => return Flow::Fatal(err),
+        }
+    };
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use thiserror::Error;
+
+    #[derive(Debug, Error)]
+    enum FatalError {
+        #[error("A fatal error occurred")]
+        FatalError,
+    }
+    impl super::FatalError for FatalError {}
+    impl PartialEq for FatalError {
+        fn eq(&self, rhs: &Self) -> bool {
+            true
+        }
+    }
+
+    #[derive(Debug, Error)]
+    enum Error {
+        #[error("an error occurred")]
+        Error,
+    }
+    impl PartialEq for Error {
+        fn eq(&self, rhs: &Self) -> bool {
+            true
+        }
+    }
+
+    impl PartialEq for Flow<i32, FatalError, Error> {
+        fn eq(&self, rhs: &Self) -> bool {
+            match (self, rhs) {
+                (Flow::Ok(val), Flow::Ok(rhs)) => val == rhs,
+                (Flow::Err(_), Flow::Err(_)) => true,
+                (Flow::Fatal(_), Flow::Fatal(_)) => true,
+                _ => false,
+            }
+        }
+    }
+
+    impl std::fmt::Debug for Flow<i32, FatalError, Error> {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            match self {
+                Flow::Ok(val) => f.write_fmt(format_args!("Flow::Ok {}", val)),
+                Flow::Err(err) => f.write_fmt(format_args!("Flow::Err {:?}", err)),
+                Flow::Fatal(err) => f.write_fmt(format_args!("Flow::Fatal {:?}", err)),
+            }
+        }
+    }
+
+    #[test]
+    fn it_can_map_things() {
+        let success = ok(15);
+        assert_eq!(ok(16), success.map(|v| v + 1));
+    }
+
+    #[test]
+    fn it_can_chain_success() {
+        let success = ok(15);
+        assert_eq!(ok(16), success.and_then(|v| ok(v + 1)));
+    }
+
+    #[test]
+    fn it_can_handle_an_error() {
+        let failure = error(Error::Error);
+        assert_eq!(ok(16), failure.or_else(|_| ok(16)));
+    }
+
+    #[test]
+    fn early_exit_on_fatal() {
+        fn ok_func() -> Flow<i32, FatalError, Error> {
+            let value = return_fatal!(ok::<i32, FatalError, Error>(15));
+            match value {
+                Ok(_) => ok(14),
+                Err(err) => error(err),
+            }
+        }
+
+        fn err_func() -> Flow<i32, FatalError, Error> {
+            let value = return_fatal!(error::<i32, FatalError, Error>(Error::Error));
+            match value {
+                Ok(_) => panic!("shouldn't have gotten here"),
+                Err(err) => ok(0),
+            }
+        }
+
+        fn fatal_func() -> Flow<i32, FatalError, Error> {
+            return_fatal!(fatal::<i32, FatalError, Error>(FatalError::FatalError));
+            panic!("failed to bail");
+        }
+
+        fatal_func();
+        assert_eq!(ok_func(), ok(14));
+        assert_eq!(err_func(), ok(0));
+    }
+
+    #[test]
+    fn it_can_early_exit_on_all_errors() {
+        fn ok_func() -> Flow<i32, FatalError, Error> {
+            let value = return_error!(ok::<i32, FatalError, Error>(15));
+            assert_eq!(value, 15);
+            ok(14)
+        }
+
+        fn err_func() -> Flow<i32, FatalError, Error> {
+            return_error!(error::<i32, FatalError, Error>(Error::Error));
+            panic!("failed to bail");
+        }
+
+        fn fatal_func() -> Flow<i32, FatalError, Error> {
+            return_error!(fatal::<i32, FatalError, Error>(FatalError::FatalError));
+            panic!("failed to bail");
+        }
+
+        fatal_func();
+        assert_eq!(ok_func(), ok(14));
+        err_func();
+    }
+}

music-player/errors.rs

@@ -0,0 +1,7 @@
+pub use flow::error;
+
+pub enum FatalError {
+    UnexpectedError,
+}
+
+impl flow::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"
@@ -155,8 +166,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "errors"
-version = "0.1.0"
+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"
@@ -167,6 +186,10 @@ dependencies = [
  "instant",
 ]
 
+[[package]]
+name = "flow"
+version = "0.1.0"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -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"
@@ -537,11 +582,14 @@ name = "music-player"
 version = "0.1.0"
 dependencies = [
  "dbus",
- "errors",
+ "flow",
  "mpris",
+ "rusqlite",
  "serde",
  "thiserror",
  "tokio",
+ "url",
+ "uuid",
  "warp",
 ]
 
@@ -712,6 +760,20 @@ 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 +1186,21 @@ 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"
+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

@@ -7,11 +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         = { version = "2.3" }
+uuid        = { version = "1", features = ["v4"] }
 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 {
@@ -83,18 +86,56 @@ impl From<mpris::DBusError> for AudioError {
     }
 }
 
-#[derive(Clone, Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct Track {
+impl From<url::ParseError> for AudioError {
+    fn from(err: url::ParseError) -> Self {
+        Self::UrlError(err)
+    }
+}
+
+#[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(),
             track_number: data.track_number(),
             name: data.title().map(|s| s.to_owned()),
             album: data.album_name().map(|s| s.to_owned()),
@@ -108,6 +149,7 @@ impl From<mpris::Metadata> for Track {
         Self::from(&data)
     }
 }
+*/
 
 #[derive(Clone, Debug, Serialize)]
 #[serde(rename_all = "camelCase")]
@@ -134,9 +176,33 @@ 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 +219,7 @@ 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 +292,17 @@ 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/playertest.rs

@@ -1,52 +0,0 @@
-/*
-Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
-
-This file is part of the Luminescent Dreams Tools.
-
-Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
-
-Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
-*/
-
-use dbus::ffidisp::Connection;
-use music_player::audio::{list_devices, Message, MprisDevice};
-use std::{io, thread};
-
-fn main() {
-    for device in list_devices(Connection::new_session().expect("connection to dbus session"))
-        .expect("to list devices")
-    {
-        println!("Device: [{}] {}", device.address, device.name);
-    }
-
-    /*
-    let progress_thread = thread::spawn(|| MprisDevice::monitor_progress(":1.1611".to_owned()));
-    let event_thread = thread::spawn(|| MprisDevice::scan_event_stream(":1.1611".to_owned()));
-    */
-
-    let (tx, rx) = std::sync::mpsc::channel();
-    let app_thread = thread::spawn(move || {
-        let mut device = MprisDevice::new(":1.1611".to_owned()).expect("to get a device");
-        device.run(rx);
-    });
-
-    let stdin = io::stdin();
-    let mut input = String::new();
-    let _ = stdin.read_line(&mut input);
-    let _ = tx.send(Message::Quit);
-
-    let _ = app_thread.join();
-
-    /*
-    println!(
-        "{:?}",
-        device.capabilities().expect("can retrieve capabilities")
-    );
-    // println!("{:?}", device.state().expect("play-pause to succeed"));
-
-    let _ = progress_thread.join();
-    let _ = event_thread.join();
-    */
-}

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

@@ -1,10 +1,8 @@
-use dbus::ffidisp::Connection;
-use serde::Serialize;
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
-use std::path::PathBuf;
-use warp::Filter;
+use flow::Flow;
+use std::{io::stdin, path::PathBuf, sync::Arc, thread, time::Duration};
+// use warp::Filter;
 
-pub mod audio;
+use music_player::{core::Core, database::MemoryIndex};
 
 /*
 fn tracks() -> Vec<Track> {
@@ -52,6 +50,16 @@ fn tracks() -> Vec<Track> {
 
 #[tokio::main]
 pub async fn main() {
+    match Core::new(Arc::new(MemoryIndex::new())) {
+        Flow::Ok(core) => {
+            let mut buf = String::new();
+            let _ = stdin().read_line(&mut buf).unwrap();
+            core.exit();
+        }
+        Flow::Err(err) => println!("non-fatal error: {:?}", err),
+        Flow::Fatal(err) => println!("fatal error: {:?}", err),
+    }
+
     /*
     let connection = Connection::new_session().expect("to connect to dbus");
 

music-player/server/src/core.rs

@@ -1,45 +1,179 @@
-use dbus::ffidisp::Connection;
-use mpris::{Player, PlayerFinder};
+use crate::{
+    database::{Database, MemoryIndex, MusicIndex},
+    Error, FatalError,
+};
+use flow::{error, fatal, ok, return_error, return_fatal, Flow};
+use std::{
+    path::{Path, PathBuf},
+    sync::{
+        mpsc::{channel, Receiver, RecvTimeoutError, Sender},
+        Arc,
+    },
+    thread,
+    thread::JoinHandle,
+    time::{Duration, Instant},
+};
 
-#[derive(Clone, Debug, Serialize)]
-#[serde(rename_all = "camelCase")]
-struct Device {
-    dbus_name: String,
-    name: String,
+#[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,
+}
+
+pub enum TrackMsg {
+    DbUpdate,
+}
+
+pub enum PlaybackMsg {
+    PositionUpdate,
+    Playing,
+    Pausing,
+    Stopping,
 }
 
 pub struct Core {
-    conn: Connection,
-    player: Player,
+    db: Arc<dyn MusicIndex>,
+    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: Arc<dyn MusicIndex>,
+    control_rx: Receiver<ControlMsg>,
+    tracker_tx: Sender<TrackMsg>,
+    next_scan: Instant,
+    music_directories: Vec<PathBuf>,
+}
+
+impl FileScanner {
+    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,
+        }
+    }
+
+    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 {
+                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 {
-    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: 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,
+                    vec![PathBuf::from("/home/savanni/Music/")],
+                    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 +1,106 @@
+use crate::{
+    audio::{Track, TrackId, TrackInfo},
+    FatalError,
+};
+use flow::{error, ok, Flow};
+use rusqlite::Connection;
+use std::collections::HashMap;
+use std::{
+    path::PathBuf,
+    sync::{Arc, Mutex, RwLock},
+};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum DatabaseError {
+    #[error("database is unreadable")]
+    DatabaseUnreadable,
+    #[error("unhandled database problem: {0}")]
+    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>,
+}
+
+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) -> Flow<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 +1,25 @@
 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, Error)]
+pub enum FatalError {
+    #[error("Unexpected error")]
+    UnexpectedError,
+}
+
+impl flow::FatalError for FatalError {}

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music-player/streamer/Cargo.toml

@@ -1,8 +1,10 @@
 [package]
-name = "errors"
+name = "streamer"
 version = "0.1.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+gstreamer = "0.19.7"
+

music-player/streamer/src/main.rs

@@ -0,0 +1,46 @@
+use gstreamer::{format::ClockTime, prelude::*, MessageView};
+use std::{thread, time, time::Duration};
+
+fn main() {
+    gstreamer::init().unwrap();
+
+    let uri = "file:///home/savanni/Music/Lindsey%20Stirling/Artemis/01%20-%20Underground.mp3.mp3";
+    let pipeline = gstreamer::parse_launch(&format!("playbin uri={}", uri)).unwrap();
+    pipeline.set_state(gstreamer::State::Playing).unwrap();
+
+    let message_handler = {
+        let pipeline = pipeline.clone();
+        thread::spawn(move || {
+            let bus = pipeline.bus().unwrap();
+            for msg in bus.iter_timed(gstreamer::ClockTime::NONE) {
+                match msg.view() {
+                    MessageView::Eos(_) => (),
+                    MessageView::Error(err) => {
+                        println!(
+                            "Error from {:?}: {} ({:?})",
+                            err.src().map(|s| s.path_string()),
+                            err.error(),
+                            err.debug()
+                        );
+                    }
+                    msg => println!("{:?}", msg),
+                }
+            }
+        })
+    };
+
+    let query_handler = {
+        let pipeline = pipeline.clone();
+        thread::spawn(move || loop {
+            let position: Option<ClockTime> = pipeline.query_position();
+            let duration: Option<ClockTime> = pipeline.query_duration();
+            println!("{:?} {:?}", position, duration);
+            thread::sleep(Duration::from_millis(100));
+        })
+    };
+
+    message_handler.join();
+    query_handler.join();
+
+    pipeline.set_state(gstreamer::State::Null).unwrap();
+}