feat: allow disabling the udp tunnel

src/config.rs

@@ -133,17 +133,36 @@ pub struct UdpTunnelConfig {
     /// For cases such as different exposed port in docker or usage behind
     /// a reverse proxy such as NGINX
     pub external_port: Option<Port>,
+
+    /// Optionally choose to disable the tunnel if you don't intend to use it
+    /// default value is true
+    pub enabled: bool,
 }
 
 impl Default for UdpTunnelConfig {
     fn default() -> Self {
         Self {
             port: 9032,
             external_port: None,
+            enabled: true,
         }
     }
 }
 
+impl UdpTunnelConfig {
+    /// Get the port the exposed to the clients for the UDP
+    /// tunnel. This is [None] if the tunnel is disabled. Otherwise
+    /// its [UdpTunnelConfig::external_port] if set otherwise its
+    /// [UdpTunnelConfig::port]
+    pub fn get_exposed_port(&self) -> Option<Port> {
+        if !self.enabled {
+            return None;
+        }
+
+        Some(self.external_port.unwrap_or(self.port))
+    }
+}
+
 /// Configuration for the server QoS setup
 #[derive(Debug, Default, Deserialize)]
 #[serde(tag = "type", rename_all = "lowercase")]

src/main.rs

@@ -78,8 +78,8 @@ async fn main() {
     ));
     let retriever = Arc::new(retriever);
 
-    // Start the tunnel server
-    if tunnel_enabled {
+    // Start the tunnel server (If enabled)
+    if tunnel_enabled && config.udp_tunnel.enabled {
         // Start the tunnel service server
         if let Err(err) = start_udp_tunnel(tunnel_addr, udp_tunnel_service.clone()).await {
             error!("failed to start udp tunnel server: {}", err);

src/routes/server.rs

@@ -39,7 +39,7 @@ pub struct ServerDetails {
     /// Random association token for the client to use
     association: String,
     /// Port the tunnel server is running on
-    tunnel_port: u16,
+    tunnel_port: Option<u16>,
 }
 
 /// GET /api/server
@@ -56,10 +56,7 @@ pub async fn server_details(
         ident: "POCKET_RELAY_SERVER",
         version: VERSION,
         association,
-        tunnel_port: config
-            .udp_tunnel
-            .external_port
-            .unwrap_or(config.udp_tunnel.port),
+        tunnel_port: config.udp_tunnel.get_exposed_port(),
     })
 }