load port from env variable

Cargo.lock

@@ -531,6 +531,7 @@ name = "miniqr"
 version = "0.1.0"
 dependencies = [
  "image",
+ "log",
  "qrcode",
  "tokio",
  "urlencoding",

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 
 [dependencies]
 image = "0.23.0"
+log = "0.4.20"
 qrcode = "0.12.0"
 tokio = { version = "1.33.0", features = ["full"] }
 urlencoding = "2.1.3"

src/main.rs

@@ -6,6 +6,14 @@ use warp::{Filter, reply::Response};
 
 #[tokio::main]
 async fn main() {
+    
+    let port = std::env::var("PORT").unwrap_or("80".to_string()).parse::<u16>();
+    if port.is_err() {
+        log::warn!("Could not parse port from environment, falling back to port 80");
+        log::warn!("Port parse error message: {}", port.clone().unwrap_err());
+    }
+    let port = port.unwrap_or(80);
+
     // Match any request and return hello world!
     let routes =
         warp::path::end()
@@ -38,5 +46,6 @@ async fn main() {
                     })
             );
 
-    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+    log::info!("Running on http://0.0.0.0:{port}");
+    warp::serve(routes).run(([0, 0, 0, 0], port)).await;
 }