From 1ae80c161f6cee193ec3659ee0b1bf9add8315d0 Mon Sep 17 00:00:00 2001
From: Simon C <simonc@linux.com>
Date: Thu, 8 Aug 2024 22:14:11 +0200
Subject: [PATCH] feat: Add auto-reload on development environment

---
 .ignore                |  5 +++++
 Cargo.lock             | 12 ++++++++++++
 crates/app/Cargo.toml  |  2 +-
 crates/app/README.md   | 14 ++++++++++++++
 crates/app/src/main.rs | 21 +++++++++++++++++----
 5 files changed, 49 insertions(+), 5 deletions(-)
 create mode 100644 .ignore

diff --git a/.ignore b/.ignore
new file mode 100644
index 0000000..4522f2d
--- /dev/null
+++ b/.ignore
@@ -0,0 +1,5 @@
+# Ignorer les fichiers dont ne dépent pas la compilation 
+*.md
+tailwind.config.js
+*.example
+scripts
diff --git a/Cargo.lock b/Cargo.lock
index eadcf9e..9791f9f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -69,6 +69,7 @@ dependencies = [
  "askama",
  "askama_axum",
  "axum",
+ "listenfd",
  "serde",
  "tokio",
  "tower-http",
@@ -1717,6 +1718,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "listenfd"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0500463acd96259d219abb05dc57e5a076ef04b2db9a2112846929b5f174c96"
+dependencies = [
+ "libc",
+ "uuid",
+ "winapi",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.12"
diff --git a/crates/app/Cargo.toml b/crates/app/Cargo.toml
index 23c7568..20024c8 100644
--- a/crates/app/Cargo.toml
+++ b/crates/app/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2021"
 askama = "0.12.1"
 askama_axum = "0.4.0"
 axum = "0.7.5"
+listenfd = "1.0.1"
 serde = { version = "1.0.204", features = ["derive"] }
 tokio = { version = "1.39.1", features = ["macros", "rt-multi-thread"] }
 tower-http = { version = "0.5.2", features = ["fs"] }
-
diff --git a/crates/app/README.md b/crates/app/README.md
index e728e9a..050bb7f 100644
--- a/crates/app/README.md
+++ b/crates/app/README.md
@@ -13,3 +13,17 @@
 ```bash
 cargo run --bin app
 ```
+
+## L'auto-reload
+
+Pour permettre au projet de s'auto-recharger lors du développement, nous avons besoin de 2 librairies :
+
+```bash
+cargo install cargo-watch systemfd
+```
+
+Pour recompiler automatiquement le serveur lors de changement :
+
+```bash
+systemfd --no-pid -s http::3000 -- cargo watch -x 'run --bin app'
+```
diff --git a/crates/app/src/main.rs b/crates/app/src/main.rs
index b409b11..333d905 100644
--- a/crates/app/src/main.rs
+++ b/crates/app/src/main.rs
@@ -1,6 +1,8 @@
 use ::app::get_router;
+use listenfd::ListenFd;
 use std::env;
 use std::path::Path;
+use tokio::net::TcpListener;
 
 #[tokio::main]
 async fn main() {
@@ -8,10 +10,21 @@ async fn main() {
     let assets_path = Path::new(&manifest_dir).join("assets");
     let router = get_router(assets_path.as_path());
 
-    // TODO: select port based on available port (or ask in CLI)
-    let listener = tokio::net::TcpListener::bind("localhost:3000")
+    let mut listenfd = ListenFd::from_env();
+    let listener = match listenfd.take_tcp_listener(0).unwrap() {
+        // if we are given a tcp listener on listen fd 0, we use that one
+        Some(listener) => {
+            listener.set_nonblocking(true).unwrap();
+            TcpListener::from_std(listener).unwrap()
+        }
+        // otherwise fall back to local listening
+        None => TcpListener::bind("localhost:3000").await.unwrap(),
+    };
+
+    println!("Listening on: http://{}", listener.local_addr().unwrap());
+
+    // Run the server with the router
+    axum::serve(listener, router.into_make_service())
         .await
         .unwrap();
-    println!("Listening on: http://{}", listener.local_addr().unwrap());
-    axum::serve(listener, router).await.unwrap();
 }