Do proper async parallelism

src/main.rs

@@ -6,6 +6,7 @@ use axum::{routing::get, Router};
 use serde::Serialize;
 use std::collections::HashSet;
 use std::net::{IpAddr, Ipv6Addr, SocketAddr};
+use tokio::task::JoinSet;
 
 #[derive(Clone)]
 struct AppState {
@@ -18,6 +19,27 @@ struct DokkuApp {
     hosts: HashSet<String>,
 }
 
+impl DokkuApp {
+    async fn try_from_path(path: PathBuf) -> Option<Self> {
+        let vhost_path = path.join("VHOST");
+
+        if !vhost_path.is_file().await {
+            return None;
+        }
+
+        let current_vhosts = read_to_string(&vhost_path).await.unwrap();
+
+        if current_vhosts.is_empty() {
+            return None;
+        }
+
+        Some(DokkuApp {
+            name: String::from(path.file_name().unwrap().to_str().unwrap()),
+            hosts: current_vhosts.lines().map(String::from).collect(),
+        })
+    }
+}
+
 fn get_dokku_root() -> Option<std::path::PathBuf> {
     // First, check if we have a custom directory
     if let Some(dokku_root) = std::env::var_os("DOKKU_ROOT") {
@@ -48,28 +70,22 @@ fn get_dokku_root() -> Option<std::path::PathBuf> {
 async fn hosts(State(state): State<AppState>) -> axum::Json<Vec<DokkuApp>> {
     let mut dir_entries = state.dokku_root.read_dir().await.unwrap();
 
-    let mut apps: Vec<DokkuApp> = Vec::new();
+    let mut join_set = JoinSet::new();
 
     while let Some(Ok(dir_entry)) = dir_entries.next().await {
         let path = dir_entry.path();
 
-        let vhost_path = path.join("VHOST");
-
-        if !vhost_path.is_file().await {
-            continue;
+        join_set.spawn(DokkuApp::try_from_path(path));
     }
 
-        let current_vhosts = read_to_string(&vhost_path).await.unwrap();
+    let mut apps: Vec<DokkuApp> = Vec::new();
 
-        if current_vhosts.is_empty() {
-            continue;
+    while let Some(res) = join_set.join_next().await {
+        if let Some(app) = res.unwrap() {
+            apps.push(app)
+        }
     }
 
-        apps.push(DokkuApp {
-            name: String::from(path.file_name().unwrap().to_str().unwrap()),
-            hosts: current_vhosts.lines().map(String::from).collect(),
-        });
-    }
     axum::Json(apps)
 }