Send player event messages over futures aware channel.

playback/src/config.rs

@@ -1,7 +1,4 @@
 use std::str::FromStr;
-use core::spotify_id::SpotifyId;
-use std::sync::mpsc::Sender;
-use player::PlayerEvent;
 
 #[derive(Clone, Copy, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
 pub enum Bitrate {
@@ -31,14 +28,12 @@ impl Default for Bitrate {
 #[derive(Clone, Debug)]
 pub struct PlayerConfig {
     pub bitrate: Bitrate,
-    pub event_sender : Option<Sender<PlayerEvent>>,
 }
 
 impl Default for PlayerConfig {
     fn default() -> PlayerConfig {
         PlayerConfig {
             bitrate: Bitrate::default(),
-            event_sender: None,
         }
     }
 }

playback/src/player.rs

@@ -1,5 +1,6 @@
 use futures::sync::oneshot;
 use futures::{future, Future};
+use futures::sync::mpsc::{UnboundedReceiver, UnboundedSender, unbounded};
 use std;
 use std::borrow::Cow;
 use std::io::{Read, Seek, SeekFrom, Result};
@@ -32,6 +33,7 @@ struct PlayerInternal {
     sink: Box<Sink>,
     sink_running: bool,
     audio_filter: Option<Box<AudioFilter + Send>>,
+    event_sender: UnboundedSender<PlayerEvent>,
 }
 
 enum PlayerCommand {
@@ -58,14 +60,15 @@ pub enum PlayerEvent {
     }
 }
 
-
+type PlayerEventChannel = UnboundedReceiver<PlayerEvent>;
 impl Player {
     pub fn new<F>(config: PlayerConfig, session: Session,
                   audio_filter: Option<Box<AudioFilter + Send>>,
-                  sink_builder: F) -> Player
+                  sink_builder: F) -> (Player, PlayerEventChannel)
         where F: FnOnce() -> Box<Sink> + Send + 'static
     {
         let (cmd_tx, cmd_rx) = std::sync::mpsc::channel();
+        let (event_sender, event_receiver) = unbounded();
 
         let handle = thread::spawn(move || {
             debug!("new Player[{}]", session.session_id());
@@ -79,15 +82,14 @@ impl Player {
                 sink: sink_builder(),
                 sink_running: false,
                 audio_filter: audio_filter,
+                event_sender: event_sender,
             };
 
             internal.run();
         });
 
-        Player {
-            commands: Some(cmd_tx),
-            thread_handle: Some(handle),
-        }
+        (Player { commands: Some(cmd_tx), thread_handle: Some(handle) },
+         event_receiver)
     }
 
     fn command(&self, cmd: PlayerCommand) {
@@ -414,11 +416,9 @@ impl PlayerInternal {
     }
 
     fn send_event(&mut self, event: PlayerEvent) {
-        if let Some(ref s) = self.config.event_sender {
-            match s.send(event.clone()) {
-                Ok(_) => info!("Sent event {:?} to event listener.", event),
-                Err(err) => error!("Failed to send event {:?} to listener: {:?}", event, err)
-            }
+        match self.event_sender.unbounded_send(event.clone()) {
+            Ok(_) => info!("Sent event {:?} to event listener.", event),
+            Err(err) => error!("Failed to send event {:?} to listener: {:?}", event, err)
         }
     }
 

src/main.rs

@@ -9,6 +9,7 @@ extern crate tokio_signal;
 
 use env_logger::LogBuilder;
 use futures::{Future, Async, Poll, Stream};
+use futures::sync::mpsc::UnboundedReceiver;
 use std::env;
 use std::io::{self, stderr, Write};
 use std::path::PathBuf;
@@ -28,7 +29,7 @@ use librespot::playback::audio_backend::{self, Sink, BACKENDS};
 use librespot::playback::config::{Bitrate, PlayerConfig};
 use librespot::connect::discovery::{discovery, DiscoveryStream};
 use librespot::playback::mixer::{self, Mixer};
-use librespot::playback::player::Player;
+use librespot::playback::player::{Player, PlayerEvent};
 use librespot::connect::spirc::{Spirc, SpircTask};
 
 mod player_event_handler;
@@ -86,6 +87,7 @@ struct Setup {
     credentials: Option<Credentials>,
     enable_discovery: bool,
     zeroconf_port: u16,
+    player_event_program: Option<String>,
 }
 
 fn setup(args: &[String]) -> Setup {
@@ -185,10 +187,7 @@ fn setup(args: &[String]) -> Setup {
             .map(|bitrate| Bitrate::from_str(bitrate).expect("Invalid bitrate"))
             .unwrap_or(Bitrate::default());
 
-        PlayerConfig {
-            bitrate: bitrate,
-            event_sender: matches.opt_str("onevent").map(run_program_on_events)
-        }
+        PlayerConfig { bitrate: bitrate }
     };
 
     let connect_config = {
@@ -216,6 +215,7 @@ fn setup(args: &[String]) -> Setup {
         enable_discovery: enable_discovery,
         zeroconf_port: zeroconf_port,
         mixer: mixer,
+        player_event_program: matches.opt_str("onevent"),
     }
 }
 
@@ -237,6 +237,9 @@ struct Main {
     connect: Box<Future<Item=Session, Error=io::Error>>,
 
     shutdown: bool,
+
+    player_event_channel: Option<UnboundedReceiver<PlayerEvent>>,
+    player_event_program: Option<String>,
 }
 
 impl Main {
@@ -257,6 +260,9 @@ impl Main {
             spirc_task: None,
             shutdown: false,
             signal: Box::new(tokio_signal::ctrl_c(&handle).flatten_stream()),
+
+            player_event_channel: None,
+            player_event_program: setup.player_event_program,
         };
 
         if setup.enable_discovery {
@@ -314,13 +320,14 @@ impl Future for Main {
 
                 let audio_filter = mixer.get_audio_filter();
                 let backend = self.backend;
-                let player = Player::new(player_config, session.clone(), audio_filter, move || {
+                let (player, event_channel) = Player::new(player_config, session.clone(), audio_filter, move || {
                     (backend)(device)
                 });
 
                 let (spirc, spirc_task) = Spirc::new(connect_config, session, player, mixer);
                 self.spirc = Some(spirc);
                 self.spirc_task = Some(spirc_task);
+                self.player_event_channel = Some(event_channel);
 
                 progress = true;
             }
@@ -348,6 +355,14 @@ impl Future for Main {
                 }
             }
 
+            if let Some(ref mut player_event_channel) = self.player_event_channel {
+                if let Async::Ready(Some(event)) = player_event_channel.poll().unwrap() {
+                    if let Some(ref program) = self.player_event_program {
+                        run_program_on_events(event, program);
+                    }
+                }
+            }
+
             if !progress {
                 return Ok(Async::NotReady);
             }

src/player_event_handler.rs

@@ -1,6 +1,4 @@
 use std::process::Command;
-use std::sync::mpsc::{channel, Sender};
-use std::thread;
 use std::collections::HashMap;
 use librespot::playback::player::PlayerEvent;
 
@@ -15,28 +13,22 @@ fn run_program(program: &str, env_vars: HashMap<&str, String>) {
     info!("Exit status: {}", status);
 }
 
-pub fn run_program_on_events(onevent: String) -> Sender<PlayerEvent> {
-    let (sender, receiver) = channel();
-    thread::spawn(move || {
-        while let Ok(msg) = receiver.recv() {
-            let mut env_vars = HashMap::new();
-            match msg {
-                PlayerEvent::Changed { old_track_id, new_track_id } => {
-                    env_vars.insert("PLAYER_EVENT", "change".to_string());
-                    env_vars.insert("OLD_TRACK_ID", old_track_id.to_base16());
-                    env_vars.insert("TRACK_ID", new_track_id.to_base16());
-                },
-                PlayerEvent::Started { track_id } => {
-                    env_vars.insert("PLAYER_EVENT", "start".to_string());
-                    env_vars.insert("TRACK_ID", track_id.to_base16());
-                }
-                PlayerEvent::Stopped { track_id } =>  {
-                    env_vars.insert("PLAYER_EVENT", "stop".to_string());
-                    env_vars.insert("TRACK_ID", track_id.to_base16());
-                }
-            }
-            run_program(&onevent, env_vars);
+pub fn run_program_on_events(event: PlayerEvent, onevent: &str) {
+    let mut env_vars = HashMap::new();
+    match event {
+        PlayerEvent::Changed { old_track_id, new_track_id } => {
+            env_vars.insert("PLAYER_EVENT", "change".to_string());
+            env_vars.insert("OLD_TRACK_ID", old_track_id.to_base16());
+            env_vars.insert("TRACK_ID", new_track_id.to_base16());
+        },
+        PlayerEvent::Started { track_id } => {
+            env_vars.insert("PLAYER_EVENT", "start".to_string());
+            env_vars.insert("TRACK_ID", track_id.to_base16());
         }
-    });
-    sender
+        PlayerEvent::Stopped { track_id } =>  {
+            env_vars.insert("PLAYER_EVENT", "stop".to_string());
+            env_vars.insert("TRACK_ID", track_id.to_base16());
+        }
+    }
+    run_program(onevent, env_vars);
 }