Thread model and error handling cleanup #30

Merged
savanni merged 3 commits from refactoring/music-tokio into main 2023-03-11 20:15:47 +00:00
10 changed files with 229 additions and 229 deletions

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@ -1,3 +1,8 @@
export type Response<A> =
| { type: "Success"; content: A }
| { type: "Failure"; content: string }
| { type: "Fatal"; content: string };
export interface TrackInfo {
id: string;
track_number?: number;
@ -8,11 +13,37 @@ export interface TrackInfo {
}
export const getTracks = (): Promise<TrackInfo[]> =>
fetch("/api/v1/tracks").then((r) => r.json());
fetch("/api/v1/tracks")
.then((r) => r.json())
.then((result: Response<TrackInfo[]>) => {
switch (result.type) {
case "Success":
return result.content || [];
case "Failure":
console.log("failed: ", result.content);
return [];
case "Fatal":
console.log("fatal: ", result.content);
return [];
}
});
export const playTrack = (id: string): Promise<Response> =>
export const playTrack = (id: string): Promise<void> =>
fetch("/api/v1/play", {
method: "POST",
headers: { "content-type": "application/json" },
body: JSON.stringify({ id: id }),
})
.then((r) => r.json())
.then((result: Response<null>) => {
console.log("result: ", result);
});
export const stopPlayback = (): Promise<void> =>
fetch("api/v1/stop", {
method: "POST",
})
.then((r) => r.json())
.then((result: Response<null>) => {
console.log("result: ", result);
});

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@ -1,6 +1,7 @@
import { TextField } from "./TextField";
export class NowPlaying extends HTMLElement {
onStop: () => void;
nameContainer: TextField;
albumContainer: TextField;
artistContainer: TextField;
@ -20,6 +21,8 @@ export class NowPlaying extends HTMLElement {
this.artistContainer = document.createElement("text-field");
this.artistContainer.classList.add("now-playing__artist");
this.onStop = () => {};
}
get name(): string | null {
@ -74,6 +77,13 @@ export class NowPlaying extends HTMLElement {
container.appendChild(this.albumContainer);
container.appendChild(this.artistContainer);
const stopButton = document.createElement("button");
stopButton.innerHTML = "Stop";
stopButton.addEventListener("click", (_) => {
this.onStop();
});
this.appendChild(container);
this.appendChild(stopButton);
}
}

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@ -1,5 +1,5 @@
import * as _ from "lodash";
import { TrackInfo, getTracks, playTrack } from "./client";
import { TrackInfo, getTracks, playTrack, stopPlayback } from "./client";
import { DataCard } from "./components/DataCard";
import { NowPlaying } from "./components/NowPlaying";
import { TextField } from "./components/TextField";
@ -55,6 +55,7 @@ const updateNowPlaying = (track: TrackInfo) => {
card.album = track.album || null;
card.artist = track.artist || null;
track_list.appendChild(card);
card.onStop = () => stopPlayback();
}
};

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@ -664,6 +664,7 @@ dependencies = [
"mime_guess",
"rusqlite",
"serde",
"serde_json",
"thiserror",
"tokio",
"url",

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@ -13,6 +13,7 @@ mime_guess = { version = "2.0" }
mime = { version = "0.3" }
rusqlite = { version = "0.28" }
serde = { version = "1.0", features = ["derive"] }
serde_json = { version = "1.0" }
thiserror = { version = "1.0" }
tokio = { version = "1.24", features = ["full"] }
url = { version = "2.3" }
@ -20,4 +21,7 @@ uuid = { version = "1", features = ["v4"] }
warp = { version = "0.3" }
urlencoding = { version = "2.1" }
[target.armv7-unknown-linux-gnueabi]
linker = "arm-linux-gnueabi-gcc"
[lib]

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@ -4,26 +4,47 @@ use music_player::{
database::{MemoryIndex, MusicIndex},
media::{TrackId, TrackInfo},
scanner::FileScanner,
Error, FatalError,
};
use serde::Deserialize;
use serde::{Deserialize, Serialize};
use std::{
net::{IpAddr, Ipv4Addr, SocketAddr},
path::PathBuf,
sync::Arc,
sync::{Arc, RwLock},
thread,
};
use warp::Filter;
#[derive(Clone, Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
struct TrackRequest {
id: String,
}
fn tracks(index: &Arc<impl MusicIndex>) -> Vec<TrackInfo> {
match index.list_tracks() {
Flow::Ok(tracks) => tracks,
Flow::Err(err) => panic!("error: {}", err),
Flow::Fatal(err) => panic!("fatal: {}", err),
#[derive(Serialize)]
#[serde(tag = "type", content = "content")]
enum Response<A: Serialize> {
Success(A),
Failure(String),
Fatal(String),
}
impl<A: Serialize> From<Result<A, Error>> for Response<A> {
fn from(res: Result<A, Error>) -> Self {
match res {
Ok(val) => Self::Success(val),
Err(err) => Self::Failure(format!("{}", err)),
}
}
}
impl<A: Serialize> From<Flow<A, FatalError, Error>> for Response<A> {
fn from(res: Flow<A, FatalError, Error>) -> Self {
match res {
Flow::Ok(val) => Self::Success(val),
Flow::Fatal(fatal) => Self::Fatal(format!("{}", fatal)),
Flow::Err(err) => Self::Failure(format!("{}", err)),
}
}
}
@ -33,8 +54,7 @@ impl Static {
fn read(self, root: PathBuf) -> String {
let mut path = root;
path.push(self.0);
println!("path: {:?}", path);
std::fs::read_to_string(path).expect("to find the file")
std::fs::read_to_string(path.clone()).expect(&format!("to find {:?}", path))
}
}
@ -51,16 +71,18 @@ pub async fn main() {
.map(|b| PathBuf::from(b))
.unwrap();
match gstreamer::init() {
Ok(()) => (),
Err(err) => panic!("failed to initialize gstreamer: {}", err),
}
let index = Arc::new(MemoryIndex::new());
let scanner = Arc::new(FileScanner::new(vec![music_root.clone()]));
let (core, api) = match Core::new(index.clone(), scanner) {
Flow::Ok((core, api)) => (core, api),
Flow::Err(error) => panic!("error: {}", error),
Flow::Fatal(error) => panic!("fatal: {}", error),
let core = match Core::new(index.clone(), scanner) {
Ok(core) => Arc::new(RwLock::new(core)),
Err(error) => panic!("core failed to initialize: {}", error),
};
let _handle = thread::spawn(move || core.start());
println!("config: {:?} {:?} {:?}", dev, bundle_root, music_root);
let root = warp::path!().and(warp::get()).map({
@ -79,8 +101,6 @@ pub async fn main() {
.map(|m| m.essence_str().to_owned())
.unwrap_or("text/plain".to_owned());
println!("mime_type: {:?}", mime_type);
// let mut path = PathBuf::from("assets");
// path.push(filename);
warp::http::Response::builder()
.header("content-type", mime_type)
.body(Static(PathBuf::from(filename)).read(bundle_root.clone()))
@ -98,21 +118,32 @@ pub async fn main() {
let track_list = warp::path!("api" / "v1" / "tracks").and(warp::get()).map({
let index = index.clone();
move || warp::reply::json(&tracks(&index))
move || {
warp::reply::json(&Response::from(
index
.list_tracks()
.map_err(|db_err| Error::DatabaseError(db_err)),
))
}
});
let play_track = warp::path!("api" / "v1" / "play")
.and(warp::post())
.and(warp::body::json())
.map({
let api = api.clone();
let core = core.clone();
move |body: TrackRequest| {
let result = api.play_track(TrackId::from(body.id));
println!("Play result: {:?}", result);
warp::reply::json(&("ok".to_owned()))
warp::reply::json(&Response::from(
core.write().unwrap().play_track(TrackId::from(body.id)),
))
}
});
let stop_playback = warp::path!("api" / "v1" / "stop").and(warp::post()).map({
let core = core.clone();
move || warp::reply::json(&Response::from(core.write().unwrap().stop_playback()))
});
/*
let tracks_for_artist = warp::path!("api" / "v1" / "artist" / String)
.and(warp::get())
@ -139,7 +170,11 @@ pub async fn main() {
.or(queue)
.or(playing_status);
*/
let routes = root.or(assets).or(track_list).or(play_track);
let routes = root
.or(assets)
.or(track_list)
.or(play_track)
.or(stop_playback);
let server = warp::serve(routes);
server
.run(SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 8002))

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@ -8,30 +8,32 @@ use crate::{
use flow::{ok, return_error, Flow};
use gstreamer::{format::ClockTime, prelude::*, MessageView};
use std::{
sync::{
mpsc::{channel, Receiver, RecvTimeoutError, Sender},
Arc, Mutex,
},
sync::{Arc, Mutex, RwLock},
thread,
thread::JoinHandle,
time::{Duration, Instant},
};
use tokio::{
sync::mpsc::{channel, Receiver, Sender},
task::AbortHandle,
};
fn scan_frequency() -> Duration {
Duration::from_secs(60)
}
#[derive(Clone)]
#[derive(Clone, Debug)]
pub enum ControlMsg {
PlayTrack(TrackId),
Exit,
}
#[derive(Clone, Debug)]
pub enum TrackMsg {
UpdateInProgress,
UpdateComplete,
}
#[derive(Clone, Debug)]
pub enum PlaybackMsg {
PositionUpdate,
Playing,
@ -41,119 +43,77 @@ pub enum PlaybackMsg {
pub struct Core {
db: Arc<dyn MusicIndex>,
scanner: Arc<dyn MusicScanner>,
control_rx: Receiver<ControlMsg>,
playback_controller: Playback,
playback_controller: Option<Playback>,
next_scan: Arc<RwLock<Instant>>,
scanner_handle: thread::JoinHandle<()>,
}
impl Core {
pub fn new(
db: Arc<dyn MusicIndex>,
scanner: Arc<dyn MusicScanner>,
) -> Flow<(Core, CoreAPI), FatalError, Error> {
let (control_tx, control_rx) = channel::<ControlMsg>();
) -> Result<Core, FatalError> {
let db = db;
let playback_controller = Playback::new();
ok((
Core {
db,
scanner,
control_rx,
playback_controller,
},
CoreAPI {
control_tx: Arc::new(Mutex::new(control_tx)),
},
))
}
pub fn start(&self) -> Flow<(), FatalError, Error> {
gstreamer::init();
let (scanner_tx, _scanner_rx) = channel();
let mut next_scan = Instant::now();
loop {
if Instant::now() >= next_scan {
let scan_start = Instant::now();
let _ = scanner_tx.send(TrackMsg::UpdateInProgress);
for track in self.scanner.scan() {
match track {
Ok(track) => self.db.add_track(track),
Err(_) => ok(()),
let next_scan = Arc::new(RwLock::new(Instant::now()));
let scanner_handle = {
let db = db.clone();
let next_scan = next_scan.clone();
thread::spawn(move || scan_loop(scanner, db, next_scan))
};
}
let _ = scanner_tx.send(TrackMsg::UpdateComplete);
next_scan = Instant::now() + scan_frequency();
println!("scan duration: {:?}", Instant::now() - scan_start);
}
match self.control_rx.recv_timeout(Duration::from_millis(1000)) {
Ok(ControlMsg::PlayTrack(id)) => {
let _ = self.play_track(id);
}
Ok(ControlMsg::Exit) => return ok(()),
Err(RecvTimeoutError::Timeout) => (),
Err(RecvTimeoutError::Disconnected) => return ok(()),
}
}
Ok(Core {
db,
playback_controller: None,
next_scan,
scanner_handle,
})
}
pub fn list_tracks<'a>(&'a self) -> Flow<Vec<TrackInfo>, FatalError, Error> {
self.db.list_tracks().map_err(Error::DatabaseError)
}
pub fn play_track<'a>(&'a self, id: TrackId) -> Flow<(), FatalError, Error> {
/*
println!("play_track: {}", id.as_ref());
let pipeline = return_error!(Flow::from(
gstreamer::parse_launch(&format!("playbin uri={}", id.as_str()))
.map_err(|err| Error::CannotPlay(err.to_string()),)
));
return_error!(Flow::from(
pipeline
.set_state(gstreamer::State::Playing)
.map_err(|err| Error::CannotPlay(err.to_string()))
));
{
let pipeline = pipeline.clone();
thread::spawn(move || {
println!("starting");
let bus = pipeline.bus().unwrap();
for msg in bus.iter_timed(gstreamer::ClockTime::NONE) {
match msg.view() {
MessageView::Eos(_) => (),
MessageView::Error(err) => {
pub fn play_track<'a>(&'a mut self, id: TrackId) -> Result<(), Error> {
self.stop_playback()?;
self.playback_controller = Some(Playback::new(id)?);
Ok(())
}
pub fn stop_playback<'a>(&'a mut self) -> Result<(), Error> {
match self.playback_controller {
Some(ref controller) => controller.stop()?,
None => (),
}
self.playback_controller = None;
Ok(())
}
}
pub fn scan_loop(
scanner: Arc<dyn MusicScanner>,
db: Arc<dyn MusicIndex>,
next_scan: Arc<RwLock<Instant>>,
) {
loop {
if Instant::now() >= *next_scan.read().unwrap() {
let scan_start = Instant::now();
let mut counter = 0;
for track in scanner.scan() {
counter += 1;
match track {
Ok(track) => db.add_track(track),
Err(_) => ok(()),
};
}
*next_scan.write().unwrap() = Instant::now() + scan_frequency();
println!(
"Error from {:?}: {} ({:?})",
err.src().map(|s| s.path_string()),
err.error(),
err.debug()
"scanned {} files in {:?}",
counter,
Instant::now() - scan_start
);
}
msg => println!("{:?}", msg),
}
}
});
}
*/
self.playback_controller.play_track(id);
ok(())
}
}
#[derive(Clone)]
pub struct CoreAPI {
control_tx: Arc<Mutex<Sender<ControlMsg>>>,
}
impl CoreAPI {
pub fn play_track(&self, id: TrackId) -> () {
self.control_tx
.lock()
.unwrap()
.send(ControlMsg::PlayTrack(id))
.unwrap()
thread::sleep(Duration::from_secs(1));
}
}
@ -170,12 +130,11 @@ mod test {
let index = MemoryIndex::new();
let scanner = MockScanner::new();
match Core::new(Arc::new(index), Arc::new(scanner)) {
Flow::Ok((core, api)) => {
Ok(core) => {
thread::sleep(Duration::from_millis(10));
f(core)
}
Flow::Err(error) => panic!("{:?}", error),
Flow::Fatal(error) => panic!("{:?}", error),
Err(error) => panic!("{:?}", error),
}
}

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@ -4,6 +4,7 @@ use crate::{
};
use flow::{error, ok, Flow};
use rusqlite::Connection;
use serde::Serialize;
use std::collections::HashMap;
use std::{
path::PathBuf,
@ -11,12 +12,12 @@ use std::{
};
use thiserror::Error;
#[derive(Debug, Error, PartialEq)]
#[derive(Debug, Error, PartialEq, Serialize)]
pub enum DatabaseError {
#[error("database is unreadable")]
DatabaseUnreadable,
#[error("unhandled database problem: {0}")]
UnhandledError(rusqlite::Error),
UnhandledError(String),
}
pub trait MusicIndex: Sync + Send {
@ -94,7 +95,7 @@ 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)),
Err(err) => return error(DatabaseError::UnhandledError(err.to_string())),
};
ok(Database {
path,

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@ -12,7 +12,7 @@ pub enum Error {
DatabaseError(DatabaseError),
#[error("Cannot play track")]
CannotPlay,
CannotPlay(String),
#[error("Cannot stop playback")]
CannotStop,

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@ -3,10 +3,10 @@ use flow::{ok, return_error, Flow};
use gstreamer::{format::ClockTime, prelude::*, MessageView, StateChangeError};
use std::{
path::PathBuf,
sync::mpsc::{channel, Receiver, Sender},
thread::{self, JoinHandle},
time::Duration,
};
use tokio::sync::mpsc::{channel, Receiver, Sender};
use urlencoding::encode;
pub enum PlaybackControl {
@ -20,84 +20,57 @@ pub enum PlaybackStatus {
}
pub struct Playback {
handle: JoinHandle<Flow<(), FatalError, Error>>,
control_tx: Sender<PlaybackControl>,
events_handle: tokio::task::JoinHandle<()>,
pipeline: gstreamer::Element,
}
impl Playback {
pub fn new() -> Playback {
let (control_tx, control_rx) = channel::<PlaybackControl>();
let handle = thread::spawn(move || {
let mut pipeline = None;
loop {
match control_rx.recv().unwrap() {
PlaybackControl::PlayTrack(id) => match play_track(id) {
Flow::Ok(pipeline_) => pipeline = Some(pipeline_),
Flow::Fatal(err) => panic!("fatal error: {:?}", err),
Flow::Err(err) => panic!("playback error: {:?}", err),
},
PlaybackControl::Stop => {
if let Some(ref pipeline) = pipeline {
return_error!(Flow::from(
pipeline
.set_state(gstreamer::State::Paused)
.map_err(|_| Error::CannotStop)
));
}
}
PlaybackControl::Exit => return ok(()),
}
}
});
Self { handle, control_tx }
}
pub fn play_track(&self, id: TrackId) {
self.control_tx
.send(PlaybackControl::PlayTrack(id))
.unwrap();
}
}
fn play_track(id: TrackId) -> Flow<gstreamer::Element, FatalError, Error> {
pub fn new(id: TrackId) -> Result<Self, Error> {
let pb = PathBuf::from(id.as_ref());
let path = pb
.iter()
.skip(1)
.map(|component| encode(&component.to_string_lossy()).into_owned())
.collect::<PathBuf>();
let playbin = format!("playbin uri=file:///{}", path.display());
println!("setting up to play {}", playbin);
let pipeline = return_error!(Flow::from(
gstreamer::parse_launch(&playbin).map_err(|err| Error::GlibError(err))
));
println!("ready to play");
return_error!(Flow::from(
let pipeline = gstreamer::parse_launch(&format!("playbin uri=file:///{}", path.display()))
.map_err(|err| Error::GlibError(err))?;
pipeline
.set_state(gstreamer::State::Playing)
.map_err(|_| Error::CannotPlay)
));
println!("playing started");
ok(pipeline)
.map_err(|err| Error::CannotPlay(err.to_string()))?;
let events_handle = tokio::task::spawn_blocking({
let pipeline = pipeline.clone();
move || pipeline_events(pipeline)
});
Ok(Self {
events_handle,
pipeline,
})
}
/*
fn play_track(id: TrackId) -> Flow<(), FatalError, Error> {
let playbin = format!("playbin uri=file://{}", id.as_ref());
let pipeline = return_error!(Flow::from(
gstreamer::parse_launch(&playbin).map_err(|err| Error::GlibError(err))
));
return_error!(Flow::from(
pipeline
.set_state(gstreamer::State::Playing)
.map_err(|_| Error::CannotPlay)
));
pub fn stop(&self) -> Result<(), Error> {
self.events_handle.abort();
self.pipeline
.set_state(gstreamer::State::Paused)
.map_err(|_| Error::CannotStop)?;
Ok(())
}
let message_handler = {
let pipeline = pipeline.clone();
thread::spawn(move || {
pub fn position(&self) -> (Option<ClockTime>, Option<ClockTime>) {
let position = self.pipeline.query_position();
let duration = self.pipeline.query_duration();
(position, duration)
}
}
impl Drop for Playback {
fn drop(&mut self) {
self.stop();
}
}
fn pipeline_events(pipeline: gstreamer::Element) {
let bus = pipeline.bus().unwrap();
for msg in bus.iter_timed(gstreamer::ClockTime::NONE) {
match msg.view() {
@ -113,19 +86,4 @@ fn play_track(id: TrackId) -> Flow<(), FatalError, Error> {
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 {:?} {:?}", position, duration);
thread::sleep(Duration::from_millis(100));
})
};
ok(())
}
*/