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Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "octave_rust"
+version = "0.1.0"
+authors = ["Zhizhou Ma <zm9913@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+lazy_static = "1.4.0"
+serenity = {version = "0.10", features = ["standard_framework", "voice", "rustls_backend", "cache", "framework"] }
+songbird = "0.1.6"
+tokio = { version = "1.0", features = ["macros", "rt-multi-thread", "time", "sync"] }
+tracing = "0.1"
+tracing-subscriber = "0.2"
+tracing-futures = "0.2"

src/audio/audio.rs

@@ -0,0 +1,118 @@
+use std::{
+    sync::Arc,
+    collections::HashMap,
+};
+use serenity::{
+    client::Context, 
+    framework::standard::{
+        Args, CommandResult,
+        macros::{command, group},
+    },
+    http::Http, model::{channel::Message, id::{ChannelId, GuildId}}};
+use tokio::{
+    sync::Mutex,
+};
+use lazy_static::lazy_static;
+use super::{
+    audio_state::AudioState,
+};
+
+#[group]
+#[commands(play)]
+struct Audio;
+
+lazy_static! {
+    static ref AUDIO_STATES: Mutex<HashMap<GuildId, Arc<AudioState>>> = {
+        Mutex::new(HashMap::new())
+    };
+}
+
+async fn get_audio_state(ctx: &Context, msg: &Message) -> Option<Arc<AudioState>> {
+    let guild = msg.guild(&ctx.cache).await.unwrap();
+    let guild_id = guild.id;
+
+    let mut audio_states = AUDIO_STATES.lock().await;
+
+    match audio_states.get(&guild_id) {
+        Some(state) => {
+            Some(state.clone())
+        }
+        None => {
+            let channel_id = guild
+                .voice_states
+                .get(&msg.author.id)
+                .and_then(|voice_state| voice_state.channel_id);
+            let channel_id = match channel_id{
+                Some(channel_id) => channel_id,
+                None => {
+                    return None;
+                }
+            };
+            let manager = songbird::get(ctx)
+                .await
+                .expect("Err get_audio_state: Songbird not initialized")
+                .clone();
+            let (handle_lock, success) = manager.join(guild_id, channel_id).await;
+            if let Err(err) = success{
+                println!("Error: {:?}", err);
+                return None;
+            }
+            let audio_state = AudioState::new(handle_lock);
+            {
+                audio_states.insert(guild_id, audio_state.clone());
+            }
+            Some(audio_state)
+        }
+    }
+}
+
+#[command]
+async fn play(ctx: &Context, msg: &Message, args: Args) -> CommandResult{
+    let query = args.rest();
+    println!("{}",query);
+
+    let audio_state = get_audio_state(ctx, msg).await;
+    let audio_state = match audio_state{
+        Some(audio_state) => audio_state,
+        None => return Ok(())
+        
+    };
+
+    AudioState::add_audio(audio_state, query).await;
+
+    Ok(())
+}
+/*
+#[command]
+async fn start(ctx: &Context, msg: &Message) -> CommandResult{
+    let c_id = msg.channel_id;
+    let b = ctx.clone();
+    println!("start command");
+    //let a= a.clone();
+    {
+        let b = b.clone();
+        tokio::spawn(async move {
+                spam(c_id, b, 3).await
+            }
+        );
+    }
+    {
+        let b = b.clone();
+        tokio::spawn(async move {
+                spam(c_id, b, 5).await
+            }
+        );
+    }
+    Ok(())
+}
+
+async fn spam(c_id: ChannelId, ctx: Context, duration: u64){
+    loop {
+        let result = c_id.say(&ctx.http, format!("{} seconds passed", duration)).await;
+        if let Err(why) = result {
+            println!("Error sending message {:?}", why);
+        }
+        sleep(Duration::from_secs(duration)).await;
+    }
+}  
+*/

src/audio/audio_state.rs

@@ -0,0 +1,108 @@
+use std::{
+    sync::Arc,
+};
+use super::{
+    song_queue::SongQueue,
+    song::{
+        Song,
+        SongMetadata,
+    },
+};
+use songbird::{
+    Call,
+    input,
+    EventHandler as VoiceEventHandler,
+    Event,
+    EventContext,
+    TrackEvent,
+};
+use serenity::{
+    async_trait,
+    prelude::{
+        Mutex as SerenityMutex,
+    }
+};
+pub struct AudioState{
+    queue: SongQueue,
+    handler: Arc<SerenityMutex<Call>>,
+}
+
+impl AudioState{
+    pub fn new(handler: Arc<SerenityMutex<Call>>) -> Arc<AudioState>{
+        let audio_state = AudioState{
+            queue: SongQueue::new(),
+            handler: handler.clone(),
+        };
+        let audio_state = Arc::new(audio_state);
+        {
+            let audio_state = audio_state.clone();
+            tokio::spawn(async {
+                AudioState::play_audio(audio_state).await;
+            });
+        }
+        audio_state
+    }
+
+    async fn play_audio(audio_state: Arc<AudioState>){
+        let mut song = audio_state.queue.pop().await;
+        println!("hi3");
+        let url = song.get_url().await;
+        println!("hi4 {}", url);
+        let source = input::ffmpeg_optioned(url, &[
+            "-reconnect","1",
+            "-reconnect_streamed","1",
+            "-reconnect_delay_max","5",
+        ], &[
+            "-f","s16le",
+            "-ar","48000",
+            "-ac","2",
+            "-acodec","pcm_f32le",
+            "-"
+        ]);
+        let source = match source.await {
+            Ok(source) => source,
+            Err(why) => {
+                panic!("Err AudioState::play_audio: {:?}", why);
+            }
+        };
+        
+        let mut handler = audio_state.handler.lock().await;
+        let song = handler.play_source(source);
+
+        if let Err(why) = song.add_event(
+            Event::Track(TrackEvent::End),
+            SongEndNotifier{
+                audio_state: audio_state.clone(),
+            }
+        ){
+            panic!("Err AudioState::play_audio: {:?}", why);
+        }
+    }
+
+    pub async fn add_audio(audio_state: Arc<AudioState>, query: &str){
+        let metadata = SongMetadata{
+            artist: None,
+            title: None,
+            duration: None,
+            query: Some(query.to_string()),
+        };
+        let song_work = Song::new_load(metadata).unwrap();
+        println!("hi1");
+        audio_state.queue.push(vec![song_work]).await;
+    }
+}
+
+struct SongEndNotifier {
+    //chan_id: ChannelId,
+    //http: Arc<Http>,
+    audio_state: Arc<AudioState>,
+}
+
+#[async_trait]
+impl VoiceEventHandler for SongEndNotifier {
+    async fn act(&self, _ctx: &EventContext<'_>) -> Option<Event> {
+        AudioState::play_audio(self.audio_state.clone()).await;
+
+        None
+    }
+}

src/audio/loader.rs

@@ -0,0 +1,67 @@
+use tokio::{
+    sync::{mpsc},
+};
+use super::{
+    work::Work,
+    youtube::ytdl,
+};
+
+pub struct Loader {
+    work: mpsc::Sender<Work>,
+    kill: mpsc::Sender<()>,
+}
+
+impl Loader{
+    pub async fn kill(& self){
+        if let Err(err) = self.kill.send(()).await{
+            println!("Error in Loader.kill: {}", err.to_string());
+        };
+    }
+    pub async fn add_work(& self, work: Work){
+        if let Err(err) = self.work.send(work).await{
+            println!("Error in Loader.kill: {}", err.to_string());
+        };
+    }
+    async fn loader_loop(mut work: mpsc::Receiver<Work>,){
+        loop{
+            let work = match work.recv().await{
+                Some(work)=>work,
+                None=>break,
+            };
+            println!("hi2");
+            // update this
+            let url = ytdl(&work.query).await;
+    
+            if let Err(err) = work.sender.send(url).await{
+                println!("Error in loader_loop: {:?}", err);
+            };
+
+            {
+                let mut is_loaded = work.is_loaded.lock().await;
+                assert!(*is_loaded == false);
+                *is_loaded = true;
+            }
+        }
+    }
+    
+    pub fn new() -> Loader{
+        let (work_tx, work_sx) = mpsc::channel(200);
+        let (kill_tx, kill_sx) = mpsc::channel(1);
+        tokio::spawn(async move{
+            Loader::start_loader_loop(work_sx, kill_sx).await
+        });
+        Loader{
+            work: work_tx,
+            kill: kill_tx,
+        }
+    }
+    
+    async fn start_loader_loop(work: mpsc::Receiver<Work>, mut kill: mpsc::Receiver<()>){
+        let f = tokio::spawn(async move {
+            Loader::loader_loop(work).await
+        });
+        kill.recv().await;
+        f.abort();
+    }
+}
+

src/audio/mod.rs

@@ -0,0 +1,10 @@
+pub mod audio;
+pub mod audio_state;
+
+mod song;
+mod loader;
+mod song_queue;
+mod youtube;
+mod work;
+
+pub use audio::*;

src/audio/song.rs

@@ -0,0 +1,107 @@
+use std::{
+    sync::{Arc},
+};
+use tokio::sync::{mpsc, Mutex};
+use super::{
+    work::Work,
+};
+
+pub enum SongUrlState{
+    Proc{
+        is_loaded: Arc<Mutex<bool>>,
+        receiver: mpsc::Receiver<String>,
+    }
+}
+
+pub struct SongMetadata{
+    pub artist: Option<String>,
+    pub title: Option<String>,
+    pub query: Option<String>,
+    pub duration: Option<u32>,
+}
+
+pub struct Song{
+    url_state: SongUrlState,
+    url: Arc<Mutex<Option<String>>>,
+    metadata: SongMetadata,
+}
+
+impl Song{
+    pub fn new_load(metadata: SongMetadata) -> Option<(Song, Work)>{
+        let query = metadata.query.clone()?;
+
+        let (tx, rx) = mpsc::channel(1);
+        let is_loaded = Arc::new(Mutex::new(false));
+        let url_state = SongUrlState::Proc{
+            is_loaded: is_loaded.clone(),
+            receiver: rx,
+        };
+        let work = Work{
+            sender: tx,
+            is_loaded: is_loaded.clone(),
+            query,
+        };
+        let song = Song{
+            url_state,
+            url: Arc::new(Mutex::new(None)),
+            metadata,
+        };
+        Some((song, work))
+    }
+    pub fn get_metadata(&self) -> &SongMetadata {
+        return &self.metadata;
+    }
+    pub async fn get_url(&mut self) -> String{
+        match &mut self.url_state{
+            SongUrlState::Proc{receiver,..} => {
+                let mut url = self.url.lock().await;
+                match url.clone(){
+                    Some(url)=>{
+                        return url;
+                    }
+                    None=>{
+                        //drop(url);
+                        let source = receiver.recv().await.unwrap();
+                        //let mut url = song.url.lock().unwrap();
+                        *url = Some(source);
+                        return url.clone().unwrap();
+                    }
+                }
+            },
+        };
+    }
+}
+
+/*
+async fn send_url(state: &SongUrlState, url: String) {
+    let SongUrlState::Proc{is_loaded, sender, ..} = state;
+    let is_loaded = is_loaded.lock().unwrap();
+    if *is_loaded{
+        return
+    }
+    sender.send(url).await.unwrap();
+}*/
+/*
+async fn hi() -> Song{
+    let (tx, rx) = mpsc::channel::<String>(100);
+    Song{
+        url: "".to_string(),
+        url_state: SongUrlState::Proc{
+            is_loaded: Arc::new(Mutex::new(false)),
+            is_waited: Arc::new(Mutex::new(false)),
+            receiver: rx,
+            //sender: tx,
+        }
+    }
+}*/
+
+/*
+async fn get_url(song: &mut Song) -> &str{
+    let is_waited = song.is_loaded.lock().unwrap();
+    if *is_waited{
+        return &song.url;
+    }
+    let wait_chan = &mut song.wait_chan;
+    song.url = wait_chan.await.unwrap();
+    &song.url
+}*/

src/audio/song_queue.rs

@@ -0,0 +1,41 @@
+use std::{
+    sync::Arc,
+    collections::VecDeque,
+    mem::drop,
+};
+use tokio::sync::{Semaphore, Mutex};
+use super::{
+    song::Song,
+    loader::Loader,
+    work::Work,
+};
+pub struct SongQueue{
+    loader: Loader,
+    queue: Arc<Mutex<VecDeque<Song>>>,
+    queue_sem: Semaphore,
+}
+
+impl SongQueue{
+    pub fn new() -> SongQueue {
+        SongQueue{
+            loader: Loader::new(),
+            queue: Arc::new(Mutex::new(VecDeque::new())),
+            queue_sem: Semaphore::new(0),
+        }
+    }
+    pub async fn push(&self, songs: Vec<(Song, Work)>){
+        let mut queue = self.queue.lock().await;
+        let count = songs.len();
+        for item in songs.into_iter(){
+            queue.push_back(item.0);
+            self.loader.add_work(item.1).await;
+        }
+        drop(queue);
+        self.queue_sem.add_permits(count);
+    }
+    pub async fn pop(&self) -> Song {
+        self.queue_sem.acquire().await.expect("Error SongQueue.pop: semaphore acquire failed").forget();
+        let mut queue = self.queue.lock().await;
+        queue.pop_front().expect("Error SongQueue.pop: semaphore sync failure")
+    }
+}

src/audio/work.rs

@@ -0,0 +1,10 @@
+use std::{
+    sync::{Arc},
+};
+use tokio::sync::{mpsc, Mutex};
+
+pub struct Work{
+    pub sender: mpsc::Sender<String>,
+    pub query: String,
+    pub is_loaded: Arc<Mutex<bool>>,
+}

src/audio/youtube.rs

@@ -0,0 +1,27 @@
+
+use tokio::process::Command;
+
+pub async fn ytdl(query: &str) -> String{
+    let mut cmd = Command::new("youtube-dl");
+    let cmd = cmd
+                       .arg("-x")
+                       .arg("--skip-download")
+                       .arg("--get-url")
+                       .arg("--audio-quality").arg("128k")
+                       .arg(format!("ytsearch:{}", query));
+    let out = cmd.output().await.unwrap();
+    println!("ytdl process finished");
+    String::from_utf8(out.stdout).unwrap()
+}
+/*
+fn ffmpeg(url: &str){
+    let cmd = Command::new("ffmpeg")
+                       .arg("-reconnect").arg("1")
+                       .arg("-reconnect_streamed").arg("1")
+                       .arg("-reconnect_delay_max").arg("5")
+                       .arg("-i").arg(url)
+                       .arg("-f").arg("s16le")
+                       .arg("-ar").arg("48000")
+                       .arg("-ac").arg("2")
+                       .arg("pipe:1");
+}*/

src/main.rs

@@ -0,0 +1,40 @@
+use serenity::{async_trait, client::{Client, Context, EventHandler}, framework::{
+        StandardFramework,
+    }, model::gateway::Ready};
+
+use songbird::{
+    SerenityInit,
+};
+
+mod audio;
+
+struct Handler;
+
+#[async_trait]
+impl EventHandler for Handler{
+    async fn ready(&self, _: Context, _: Ready){
+        println!("bot connected");
+    }
+}
+
+
+#[tokio::main]
+async fn main() {
+    let token = "ODQyMzUyNjcxMTE2NDkyODIy.YJ0EDg.JP9PZHKGc23ZF_5W-j-gipnbYW8";
+    let framework = StandardFramework::new()
+        .configure(|c|{
+            c.prefix("a.")
+        })
+        .group(&audio::AUDIO_GROUP);
+    
+    let mut client = Client::builder(token)
+        .event_handler(Handler)
+        .framework(framework)
+        .register_songbird()
+        .await
+        .expect("Error creating client");
+
+    if let Err(why) = client.start().await{
+        println!("Error starting client: {:?}", why);
+    }
+}