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107 lines
3.3 KiB
Rust
107 lines
3.3 KiB
Rust
use crate::providers::music::queue::Song;
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use crate::providers::music::responses::{PlaylistEntry, VideoInformation};
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use crate::utils::error::BotResult;
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use futures::future::BoxFuture;
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use futures::FutureExt;
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use std::process::Stdio;
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use std::sync::atomic::{AtomicU8, Ordering};
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::io::AsyncReadExt;
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use tokio::process::Command;
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pub(crate) mod queue;
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pub(crate) mod responses;
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pub(crate) mod spotify;
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static THREAD_LIMIT: u8 = 64;
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/// Returns a list of youtube videos for a given url
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pub(crate) async fn get_videos_for_playlist(url: &str) -> BotResult<Vec<PlaylistEntry>> {
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log::debug!("Getting playlist information for {}", url);
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let output =
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youtube_dl(&["--no-warnings", "--flat-playlist", "--dump-json", "-i", url]).await?;
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let videos = output
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.lines()
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.filter_map(|l| serde_json::from_str::<PlaylistEntry>(l).ok())
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.collect();
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Ok(videos)
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}
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/// Returns information for a single video by using youtube-dl
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pub(crate) async fn get_video_information(url: &str) -> BotResult<VideoInformation> {
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log::debug!("Fetching information for '{}'", url);
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let output = youtube_dl(&["--no-warnings", "--dump-json", "-i", url]).await?;
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let information = serde_json::from_str(&*output)?;
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Ok(information)
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}
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/// Searches for a video
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pub(crate) async fn search_video_information(query: String) -> BotResult<Option<VideoInformation>> {
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log::debug!("Searching for video '{}'", query);
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let output = youtube_dl(&[
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"--no-warnings",
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"--dump-json",
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"-i",
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format!("ytsearch:\"{}\"", query).as_str(),
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])
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.await?;
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let information = serde_json::from_str(&*output)?;
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Ok(information)
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}
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/// Searches songs on youtube in parallel
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#[allow(dead_code)]
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async fn parallel_search_youtube(song_names: Vec<String>) -> Vec<Song> {
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let search_futures: Vec<BoxFuture<BotResult<Option<VideoInformation>>>> = song_names
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.into_iter()
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.map(|s| search_video_information(s).boxed())
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.collect();
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let information: Vec<BotResult<Option<VideoInformation>>> =
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futures::future::join_all(search_futures).await;
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information
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.into_iter()
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.filter_map(|i| i.ok().and_then(|s| s).map(Song::from))
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.collect()
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}
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/// Executes youtube-dl asynchronously
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/// An atomic U8 is used to control the number of parallel processes
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/// to avoid using too much memory
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async fn youtube_dl(args: &[&str]) -> BotResult<String> {
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lazy_static::lazy_static! { static ref THREAD_LOCK: Arc<AtomicU8> = Arc::new(AtomicU8::new(0)); }
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log::trace!("Running youtube-dl with args {:?}", args);
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while THREAD_LOCK.load(Ordering::SeqCst) >= THREAD_LIMIT {
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tokio::time::sleep(Duration::from_millis(100)).await;
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}
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THREAD_LOCK.fetch_add(1, Ordering::Relaxed);
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let ytdl = Command::new("youtube-dl")
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.args(args)
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.stdout(Stdio::piped())
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.spawn()
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.map_err(|e| {
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THREAD_LOCK.fetch_sub(1, Ordering::Relaxed);
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e
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})?;
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let mut output = String::new();
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ytdl.stdout
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.unwrap()
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.read_to_string(&mut output)
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.await
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.map_err(|e| {
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THREAD_LOCK.fetch_sub(1, Ordering::Relaxed);
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e
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})?;
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log::trace!("youtube-dl response is {}", output);
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THREAD_LOCK.fetch_sub(1, Ordering::Relaxed);
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Ok(output)
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}
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