add option to disable listeners

Signed-off-by: Jason Volk <jason@zemos.net>

conduwuit-example.toml

@@ -1503,6 +1503,11 @@
 #
 #sender_workers = 0
 
+# Enables listener sockets; can be set to false to disable listening. This
+# option is intended for developer/diagnostic purposes only.
+#
+#listening = true
+
 [global.tls]
 
 # Path to a valid TLS certificate file.

src/core/config/mod.rs

@@ -1710,6 +1710,11 @@ pub struct Config {
 	#[serde(default)]
 	pub sender_workers: usize,
 
+	/// Enables listener sockets; can be set to false to disable listening. This
+	/// option is intended for developer/diagnostic purposes only.
+	#[serde(default = "true_fn")]
+	pub listening: bool,
+
 	#[serde(flatten)]
 	#[allow(clippy::zero_sized_map_values)]
 	// this is a catchall, the map shouldn't be zero at runtime

src/router/serve/mod.rs

@@ -6,7 +6,7 @@ mod unix;
 use std::sync::Arc;
 
 use axum_server::Handle as ServerHandle;
-use conduwuit::Result;
+use conduwuit::{err, Result};
 use conduwuit_service::Services;
 use tokio::sync::broadcast;
 
@@ -16,13 +16,19 @@ use super::layers;
 pub(super) async fn serve(
 	services: Arc<Services>,
 	handle: ServerHandle,
-	shutdown: broadcast::Receiver<()>,
-) -> Result<()> {
+	mut shutdown: broadcast::Receiver<()>,
+) -> Result {
 	let server = &services.server;
 	let config = &server.config;
+	if !config.listening {
+		return shutdown
+			.recv()
+			.await
+			.map_err(|e| err!(error!("channel error: {e}")));
+	}
+
 	let addrs = config.get_bind_addrs();
 	let (app, _guard) = layers::build(&services)?;
-
 	if cfg!(unix) && config.unix_socket_path.is_some() {
 		unix::serve(server, app, shutdown).await
 	} else if config.tls.certs.is_some() {