Define thread pool size in some getter

src/main.rs

@@ -47,6 +47,12 @@ fn main() -> ExitCode {
     ExitCode::FAILURE
 }
 
+fn get_thread_pool_size() -> usize {
+    std::env::var("THREAD_POOL")
+        .map(|s| s.parse().unwrap_or(4))
+        .unwrap_or(4)
+}
+
 fn start_server(
     path: PathBuf,
     address: &str,
@@ -59,12 +65,8 @@ fn start_server(
     };
     eprintln!("Strated server!");
 
-    let context: Arc<Mutex<Context>> = Arc::default();
+    let context = Arc::new(Mutex::new(Context::default()));
-
+    let mut pool = ThreadPool::new(get_thread_pool_size());
-    let thread_pool_size = std::env::var("THREAD_POOL")
-        .map(|s| s.parse().unwrap_or(4))
-        .unwrap_or(4);
-    let mut pool = ThreadPool::new(thread_pool_size);
 
     for stream in listener.incoming() {
         eprintln!("New connection!");