Add enhanced logging and tracing for playlist generation

src/video.rs

@@ -3,7 +3,7 @@ use crate::otel::global_tracer;
 use actix::prelude::*;
 use futures::TryFutureExt;
 use log::{debug, error, info, trace, warn};
-use opentelemetry::trace::{Span, Tracer};
+use opentelemetry::trace::{Span, Status, Tracer};
 use opentelemetry::KeyValue;
 use std::io::Result;
 use std::path::{Path, PathBuf};
@@ -234,6 +234,16 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
             playlist_path,
             msg.video_path.file_name().unwrap().to_str().unwrap()
         );
+        
+        let tracer = global_tracer();
+        let mut span = tracer
+            .span_builder("playlistgenerator.generate_playlist")
+            .with_attributes(vec![
+                KeyValue::new("video_file", video_file.clone()),
+                KeyValue::new("playlist_file", playlist_file.clone()),
+            ])
+            .start(&tracer);
+        
         Box::pin(async move {
             let wait_start = std::time::Instant::now();
             let permit = semaphore
@@ -245,9 +255,16 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
                 "Waited for {:?} before starting ffmpeg",
                 wait_start.elapsed()
             );
+            span.add_event("Waited for FFMPEG semaphore", vec![
+                KeyValue::new("wait_time", wait_start.elapsed().as_secs_f64())
+            ]);
 
             if Path::new(&playlist_file).exists() {
                 debug!("Playlist already exists: {}", playlist_file);
+                span.set_status(Status::error(format!(
+                    "Playlist already exists: {}",
+                    playlist_file
+                )));
                 return Err(std::io::Error::from(std::io::ErrorKind::AlreadyExists));
             }
 
@@ -282,6 +299,8 @@ impl Handler<GeneratePlaylistMessage> for PlaylistGenerator {
                     debug!("ffmpeg output: {:?}", res);
                 }
                 
+                span.set_status(Status::Ok);
+
                 ffmpeg_result
             });