feat: now a simple webserver with axum

i plan to make it keep an ongoing single session so a dedicated process
answering http requests will make sense

Cargo.toml

@@ -11,9 +11,13 @@ description = "check mumble server stats using http requests"
 #license = "LICENSE"
 
 [dependencies]
+axum = "0.7.4"
 chrono = "0.4"
 clap = { version = "4.5", features = ["derive"] }
+serde = { version = "1.0.196", features = ["derive"] }
 tokio = { version = "1.36", features = ["net", "macros", "rt-multi-thread", "io-util"] }
+tracing = "0.1.40"
+tracing-subscriber = "0.3.18"
 
 [dev-dependencies]
 

src/main.rs

@@ -1,68 +1,47 @@
-use std::net::SocketAddr;
+use std::net::ToSocketAddrs;
 
 use clap::Parser;
-use tokio::{io::{AsyncReadExt, AsyncWriteExt}, net::UdpSocket};
+
+use axum::{extract::Query, routing::get, Json, Router};
+use mumble::ping_mumble_server;
+use proto::PongPacket;
+
+mod proto;
+mod mumble;
 
 #[derive(Parser)]
 struct CliArgs {
-	server: String,
 }
 
 #[tokio::main]
 async fn main() {
-	let args = CliArgs::parse();
+	// initialize tracing
+	tracing_subscriber::fmt::init();
 
-	let dest : SocketAddr = args.server.parse().unwrap();
+	// build our application with a route
+	let app = Router::new()
+		.route("/ping", get(ping_server));
 
-	// by default bind on any interface and request OS to give us a port
-	let mut addr : SocketAddr = "0.0.0.0:0".parse().unwrap();
-	let socket = UdpSocket::bind(addr).await.unwrap();
-
-
-	let packet = PingPacket { id: 0, time: chrono::Utc::now().timestamp_micros() as u64 };
-	let buf = packet.serialize().await.unwrap();
-
-	socket.send_to(&buf, dest).await.unwrap();
-
-	let mut buf = [0u8; 1024];
-	socket.recv(&mut buf).await.unwrap();
-
-	let pong = PongPacket::deserialize(&buf).await.unwrap();
-
-	println!("{pong:#?}");
+	let listener = tokio::net::TcpListener::bind("127.0.0.1:57039").await.unwrap();
+	axum::serve(listener, app).await.unwrap();
 }
 
-struct PingPacket {
-	id: i32,
-	time: u64,
+#[derive(serde::Deserialize)]
+struct PingOptions {
+	host: String,
+	port: Option<u16>,
 }
 
-impl PingPacket {
-	async fn serialize(self) -> std::io::Result<Vec<u8>> {
-		let mut out = Vec::new();
-		out.write_i32(self.id).await?;
-		out.write_u64(self.time).await?;
-		Ok(out)
-	}
-}
-
-
-#[derive(Debug)]
-struct PongPacket {
-	version: u32,
-	time: u64,
-	users: i32,
-	max_users: i32,
-	bandwidth: i32,
-}
-
-impl PongPacket {
-	async fn deserialize(mut data: &[u8]) -> std::io::Result<Self> {
-		let version = data.read_u32().await?;
-		let time = data.read_u64().await?;
-		let users = data.read_i32().await?;
-		let max_users = data.read_i32().await?;
-		let bandwidth = data.read_i32().await?;
-		Ok(PongPacket { version, time, users, max_users, bandwidth })
+async fn ping_server(Query(options): Query<PingOptions>) -> Result<Json<PongPacket>, String> {
+	let tuple = (options.host, options.port.unwrap_or(64738));
+	match tuple.to_socket_addrs() {
+		Err(e) => Err(format!("invalid address: {e}")),
+		Ok(mut addrs) => match addrs.next() {
+			None => Err("could not resolve host".to_string()),
+			Some(addr) => match ping_mumble_server(addr).await {
+				Ok(pong) => Ok(Json(pong)),
+				Err(e) => Err(format!("could not ping server: {e}")),
+			}
+		}
 	}
 }

src/mumble.rs

@@ -0,0 +1,22 @@
+use std::net::SocketAddr;
+
+use tokio::net::UdpSocket;
+
+use crate::proto::{PingPacket, PongPacket};
+
+
+pub async fn ping_mumble_server(addr: SocketAddr) -> std::io::Result<PongPacket> {
+	// by default bind on any interface and request OS to give us a port
+	let from_addr : SocketAddr = "0.0.0.0:0".parse().expect("could not create socketaddr from '0.0.0.0:0'");
+	let socket = UdpSocket::bind(from_addr).await?;
+
+	let packet = PingPacket { id: 0, time: chrono::Utc::now().timestamp_micros() as u64 };
+	let buf = packet.serialize().await?;
+
+	socket.send_to(&buf, addr).await?;
+
+	let mut buf = [0u8; 64];
+	socket.recv(&mut buf).await?;
+
+	PongPacket::deserialize(&buf).await
+}

src/proto.rs

@@ -0,0 +1,35 @@
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+
+pub struct PingPacket {
+	pub id: i32,
+	pub time: u64,
+}
+
+impl PingPacket {
+	pub async fn serialize(self) -> std::io::Result<Vec<u8>> {
+		let mut out = Vec::new();
+		out.write_i32(self.id).await?;
+		out.write_u64(self.time).await?;
+		Ok(out)
+	}
+}
+
+#[derive(Debug, serde::Serialize)]
+pub struct PongPacket {
+	pub version: u32,
+	pub time: u64,
+	pub users: i32,
+	pub max_users: i32,
+	pub bandwidth: i32,
+}
+
+impl PongPacket {
+	pub async fn deserialize(mut data: &[u8]) -> std::io::Result<Self> {
+		let version = data.read_u32().await?;
+		let time = data.read_u64().await?;
+		let users = data.read_i32().await?;
+		let max_users = data.read_i32().await?;
+		let bandwidth = data.read_i32().await?;
+		Ok(PongPacket { version, time, users, max_users, bandwidth })
+	}
+}