Introduce shuttle-ntex service

Author: pavlospt

.circleci/config.yml

@@ -624,6 +624,7 @@ workflows:
                 - resources/opendal
                 - services/shuttle-actix-web
                 - services/shuttle-axum
+                - services/shuttle-ntex
                 - services/shuttle-poem
                 - services/shuttle-rocket
                 - services/shuttle-salvo
@@ -899,6 +900,7 @@ workflows:
               path:
                 - services/shuttle-actix-web
                 - services/shuttle-axum
+                - services/shuttle-ntex
                 - services/shuttle-poem
                 - services/shuttle-rocket
                 - services/shuttle-salvo

services/shuttle-ntex/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "shuttle-ntex"
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+description = "Service implementation to run a Ntex webserver on shuttle"
+keywords = ["shuttle-service", "ntex"]
+
+[workspace]
+
+[dependencies]
+ntex = { version = "1.2.1"}
+shuttle-runtime = { path = "../../runtime", version = "0.43.0", default-features = false }
+num_cpus = "1.16.0"
+
+[dev-dependencies]
+tokio = { version = "1.26.0", features = ["macros", "rt-multi-thread"] }

services/shuttle-ntex/README.md

@@ -0,0 +1,22 @@
+## Shuttle service integration for the Ntex Web framework
+
+### Example
+
+```rust,no_run
+use ntex::web::{get, ServiceConfig};
+use shuttle_ntex::ShuttleNtexWeb;
+
+#[get("/")]
+async fn hello_world() -> &'static str {
+    "Hello World!"
+}
+
+#[shuttle_runtime::main]
+async fn ntex_web() -> ShuttleNtexWeb<impl FnOnce(&mut ServiceConfig) + Send + Clone + 'static> {
+    let config = move |cfg: &mut ServiceConfig| {
+        cfg.service(hello_world);
+    };
+
+    Ok(config.into())
+}
+```

services/shuttle-ntex/src/lib.rs

@@ -0,0 +1,40 @@
+#![doc = include_str!("../README.md")]
+use std::net::SocketAddr;
+
+/// A wrapper type for a closure that returns an [ntex::web::ServiceConfig] so we can implement
+/// [shuttle_runtime::Service] for it.
+#[derive(Clone)]
+pub struct NtexWebService<F>(pub F);
+
+#[shuttle_runtime::async_trait]
+impl<F> shuttle_runtime::Service for NtexWebService<F>
+where
+    F: FnOnce(&mut ntex::web::ServiceConfig) + Send + Clone + 'static,
+{
+    async fn bind(mut self, addr: SocketAddr) -> Result<(), shuttle_runtime::Error> {
+        // Start a worker for each cpu, but no more than 4.
+        let worker_count = num_cpus::get().min(4);
+
+        let server =
+            ntex::web::HttpServer::new(move || ntex::web::App::new().configure(self.0.clone()))
+                .workers(worker_count)
+                .bind(addr)?
+                .run();
+
+        server.await.map_err(shuttle_runtime::CustomError::new)?;
+
+        Ok(())
+    }
+}
+
+impl<F> From<F> for NtexWebService<F>
+where
+    F: FnOnce(&mut ntex::web::ServiceConfig) + Send + Clone + 'static,
+{
+    fn from(service_config: F) -> Self {
+        Self(service_config)
+    }
+}
+
+#[doc = include_str!("../README.md")]
+pub type ShuttleNtexWeb<F> = Result<NtexWebService<F>, shuttle_runtime::Error>;