Reload relay config every minute

src/bin/ptth_relay.rs

@@ -1,5 +1,6 @@
 use std::{
 	error::Error,
+	path::PathBuf,
 	sync::Arc,
 };
 
@@ -21,7 +22,8 @@ async fn main () -> Result <(), Box <dyn Error>> {
 		.init ()
 	;
 	
-	let config_file = ptth::load_toml::load_public ("config/ptth_relay.toml");
+	let config_path = PathBuf::from ("config/ptth_relay.toml");
+	let config_file = ptth::load_toml::load_public (&config_path);
 	
 	info! ("ptth_relay Git version: {:?}", ptth::git_version::GIT_VERSION);
 	
@@ -30,7 +32,8 @@ async fn main () -> Result <(), Box <dyn Error>> {
 	forced_shutdown.wrap_server (
 		relay::run_relay (
 			Arc::new (RelayState::from (&config_file)),
-			shutdown_rx
+			shutdown_rx,
+			Some (config_path)
 		)
 	).await??;
 	

src/lib.rs

@@ -116,7 +116,7 @@ mod tests {
 			let relay_state_2 = relay_state.clone ();
 			let (stop_relay_tx, stop_relay_rx) = oneshot::channel ();
 			let task_relay = spawn (async move {
-				relay::run_relay (relay_state_2, stop_relay_rx).await.unwrap ();
+				relay::run_relay (relay_state_2, stop_relay_rx, None).await.unwrap ();
 			});
 			
 			assert! (relay_state.list_servers ().await.is_empty ());

src/relay/mod.rs

@@ -663,9 +663,35 @@ pub fn load_templates (asset_root: &Path)
 	Ok (handlebars)
 }
 
+async fn reload_config (
+	state: &Arc <RelayState>,
+	config_reload_path: &Path
+) -> Option <()> {
+	use tokio::prelude::*;
+	
+	let mut f = tokio::fs::File::open (config_reload_path).await.ok ()?;
+	
+	let mut buffer = vec! [0u8; 4096];
+	let bytes_read = f.read (&mut buffer).await.ok ()?;
+	buffer.truncate (bytes_read);
+	
+	let config_s = String::from_utf8 (buffer).ok ()?;
+	let new_config: ConfigFile = toml::from_str (&config_s).ok ()?;
+	
+	let new_config = Config::from (&new_config);
+	
+	let mut config = state.config.write ().await;
+	(*config) = new_config;
+	
+	debug! ("Loaded {} server tripcodes", config.server_tripcodes.len ());
+	
+	Some (())
+}
+
 pub async fn run_relay (
 	state: Arc <RelayState>,
-	shutdown_oneshot: oneshot::Receiver <()>
+	shutdown_oneshot: oneshot::Receiver <()>,
+	config_reload_path: Option <PathBuf>
 ) 
 -> Result <(), Box <dyn Error>> 
 {
@@ -674,16 +700,16 @@ pub async fn run_relay (
 		4000,
 	));
 	
-	{
-		let mut tripcode_set = HashSet::new ();
-		let config = state.config.read ().await;
-		for (_, v) in config.server_tripcodes.iter () {
-			if ! tripcode_set.insert (v) {
-				panic! ("Two servers have the same tripcode. That is not allowed.");
+	if let Some (config_reload_path) = config_reload_path {
+		let state_2 = state.clone ();
+		tokio::spawn (async move {
+			let mut reload_interval = tokio::time::interval (Duration::from_secs (60));
+			
+			loop {
+				reload_interval.tick ().await;
+				reload_config (&state_2, &config_reload_path).await;
 			}
-		}
-		
-		info! ("Loaded {} server tripcodes", config.server_tripcodes.len ());
+		});
 	}
 	
 	let make_svc = make_service_fn (|_conn| {
@@ -701,8 +727,6 @@ pub async fn run_relay (
 	let server = Server::bind (&addr)
 	.serve (make_svc);
 	
-	
-	
 	server.with_graceful_shutdown (async {
 		shutdown_oneshot.await.ok ();
 		

todo.md

@@ -1,4 +1,3 @@
-- Reload relay config (or at least tripcodes) without downtime
 - "Preview as" feature for Markdown (It's not threaded through the relay yet)
 - Remote `tail -f` (_Complicated_) (Maybe use chunked encoding or something?)
 - Make a debug client to replicate the issue Firefox is having with turtling