src/youtube_dl.rs


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use futures::compat::Future01CompatExt;
use std::process::{Command, Stdio};
use tokio_process::CommandExt;

use serde::{Deserialize, Serialize};

use log::debug;

#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct AudioMetadata {
    pub url: String,
    pub title: String,
}

pub async fn get_audio_download_url(uri: String) -> Result<AudioMetadata, String> {
    let ytdl_args = ["--no-playlist", "-f", "bestaudio/best", "-j", &uri];

    let mut cmd = Command::new("youtube-dl");
    cmd.args(&ytdl_args);
    cmd.stdin(Stdio::null());

    debug!("yt-dl command: {:?}", cmd);

    let ytdl_output = cmd.output_async().compat().await.unwrap();

    if ytdl_output.status.success() == false {
        return Err(String::from_utf8(ytdl_output.stderr.clone()).unwrap());
    }

    let output_str = String::from_utf8(ytdl_output.stdout.clone()).unwrap();
    let output = serde_json::from_str(&output_str).map_err(|e| e.to_string())?;

    Ok(output)
}