Make ports configurable

src/main.rs

@@ -1,5 +1,6 @@
 use actix_web::middleware::Logger;
 use actix_web::{web, App, HttpResponse, HttpServer};
+use clap::Parser;
 use log::LevelFilter;
 use rand::Rng;
 
@@ -10,6 +11,18 @@ async fn home() -> HttpResponse {
         .body(include_str!("../assets/home.html"))
 }
 
+/// Server with hidden exposed port
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Minimal port this server will listen to
+    #[arg(short, long, default_value_t = 80)]
+    min_port: u16,
+    /// Maximal port this server will listen to
+    #[arg(short, long, default_value_t = 1000)]
+    max_port: u16,
+}
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
     env_logger::Builder::new()
@@ -17,10 +30,17 @@ async fn main() -> std::io::Result<()> {
         .filter(None, LevelFilter::Info)
         .init();
 
+    let args: Args = Args::parse();
+
+    assert!(
+        args.max_port > args.min_port,
+        "Max port shall be greater than min port!"
+    );
+
     log::info!("Choosing a random port to start...");
 
     let mut rng = rand::thread_rng();
-    let port: u16 = 80 + rng.random::<u16>() % 10000;
+    let port: u16 = args.min_port + rng.random::<u16>() % (args.max_port - args.min_port);
 
     HttpServer::new(|| {
         App::new()