Make playlist generation async

This should allow other requests to be answered while we wait for ffmpeg
to do its thing.

src/main.rs

@@ -14,8 +14,11 @@ use std::sync::Arc;
 use actix::{Actor, Addr};
 use actix_files::NamedFile;
 use actix_multipart as mp;
-use actix_web::web::{HttpRequest, HttpResponse, Json};
 use actix_web::{get, post, web, App, HttpServer, Responder};
+use actix_web::{
+    middleware,
+    web::{HttpRequest, HttpResponse, Json},
+};
 use notify::{watcher, DebouncedEvent, RecursiveMode, Watcher};
 use rayon::prelude::*;
 use serde::Serialize;
@@ -157,7 +160,7 @@ async fn generate_video(
         let filename = name.to_str().expect("Filename should convert to string");
         let playlist = format!("tmp/{}.m3u8", filename);
         if let Some(path) = is_valid_path(&body.path) {
-            if let Ok(child) = create_playlist(&path.to_str().unwrap(), &playlist) {
+            if let Ok(child) = create_playlist(&path.to_str().unwrap(), &playlist).await {
                 data.stream_manager
                     .do_send(ProcessMessage(playlist.clone(), child));
             }