Make it an HTTP server

5 files changed, 846 insertions, 2 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 80cfd05..f5388a5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,790 @@
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diff --git a/Cargo.toml b/Cargo.toml
index 319aedf..3fcdf99 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,6 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+axum = "0.7.5"
+clap = { version = "4.5.16", features = ["derive", "env"] }
+tokio = { version = "1.40.0", features = ["rt", "macros", "rt-multi-thread"] }
diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..b165677
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,47 @@
+use std::io;
+
+use axum::{routing::get, Router};
+use clap::Parser;
+
+#[derive(Parser)]
+pub struct Args {
+    #[arg(short, long, env, default_value = "localhost")]
+    address: String,
+
+    #[arg(short, long, env, default_value_t = 64209)]
+    port: u16,
+}
+
+impl Args {
+    pub async fn run(self) -> io::Result<()> {
+        let app = Router::new().route("/", get(hello));
+
+        let listener = self.listener().await?;
+        let started_msg = started_msg(&listener)?;
+
+        let serve = axum::serve(listener, app);
+        println!("{started_msg}");
+        serve.await?;
+
+        Ok(())
+    }
+
+    async fn listener(&self) -> io::Result<tokio::net::TcpListener> {
+        let listen_addr = self.listen_addr();
+        let listener = tokio::net::TcpListener::bind(listen_addr).await?;
+        Ok(listener)
+    }
+
+    fn listen_addr(&self) -> impl tokio::net::ToSocketAddrs + '_ {
+        (self.address.as_str(), self.port)
+    }
+}
+
+fn started_msg(listener: &tokio::net::TcpListener) -> io::Result<String> {
+    let local_addr = listener.local_addr()?;
+    Ok(format!("listening on http://{local_addr}/"))
+}
+
+async fn hello() -> &'static str {
+    "Hello, world"
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..4f77372
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+pub mod cli;
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..43c4e48 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,11 @@
-fn main() {
-    println!("Hello, world!");
+use std::io;
+
+use clap::Parser;
+
+use hi::cli::Args;
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let args = Args::parse();
+    args.run().await
 }