From 50087bc3bec74069d21f972c246ca22a6d70c1ed Mon Sep 17 00:00:00 2001
From: kilmanio <f.vastenhout@live.nl>
Date: Sat, 3 Oct 2020 16:55:36 +0000
Subject: Added retry functionality for youtube-dl failing

---
 src/bot/music.rs  |  2 +-
 src/youtube_dl.rs | 29 +++++++++++++++++++++++------
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/src/bot/music.rs b/src/bot/music.rs
index 19b1c3f..90305d0 100644
--- a/src/bot/music.rs
+++ b/src/bot/music.rs
@@ -185,7 +185,7 @@ impl MusicBot {
     }
 
     pub async fn add_audio(&self, url: String, user: String) {
-        match crate::youtube_dl::get_audio_download_url(url).await {
+        match crate::youtube_dl::get_audio_download_from_url(url).await {
             Ok(mut metadata) => {
                 metadata.added_by = user;
                 info!("Found audio url: {}", metadata.url);
diff --git a/src/youtube_dl.rs b/src/youtube_dl.rs
index cc708af..496d0b4 100644
--- a/src/youtube_dl.rs
+++ b/src/youtube_dl.rs
@@ -28,23 +28,40 @@ where
     Ok(dur.map(Duration::from_secs_f64))
 }
 
-pub async fn get_audio_download_url(uri: String) -> Result<AudioMetadata, String> {
-    let ytdl_args = ["--no-playlist", "-f", "bestaudio/best", "-j", &uri];
+pub async fn get_audio_download_from_url(uri: String) -> Result<AudioMetadata, String> {
+    //youtube-dl sometimes just fails, so we give it a second try
+    let ytdl_output = match run_youtube_dl(&uri).await {
+        Ok(o) => o,
+        Err(e) => {
+            if e.contains("Unable to extract video data") {
+                run_youtube_dl(&uri).await?
+            } else {
+                return Err(e);
+            }
+        }
+    };
+
+    let output = serde_json::from_str(&ytdl_output).map_err(|e| e.to_string())?;
+
+    Ok(output)
+}
+
+async fn run_youtube_dl(url: &str) -> Result<String, String> {
+    let ytdl_args = ["--no-playlist", "-f", "bestaudio/best", "-j", &url];
 
     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().await.unwrap();
 
     if !ytdl_output.status.success() {
-        return Err(String::from_utf8(ytdl_output.stderr).unwrap());
+        let s = String::from_utf8(ytdl_output.stderr).unwrap();
+        return Err(s);
     }
 
     let output_str = String::from_utf8(ytdl_output.stdout).unwrap();
-    let output = serde_json::from_str(&output_str).map_err(|e| e.to_string())?;
 
-    Ok(output)
+    Ok(output_str)
 }
-- 
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