Allow naming spawner threads

src/main.rs

@@ -259,8 +259,8 @@ async fn do_server_main(
 
     let keys = config.open_keys()?;
 
-    let spawner = Spawner::build(config.signature_threads())?;
-    let verify_spawner = Spawner::build((config.signature_threads() / 2).max(1))?;
+    let spawner = Spawner::build("signature-thread", config.signature_threads())?;
+    let verify_spawner = Spawner::build("verify-thread", (config.signature_threads() / 8).max(1))?;
 
     let bind_address = config.bind_address();
     let server = HttpServer::new(move || {

src/spawner.rs

@@ -6,18 +6,22 @@ use std::{
     time::{Duration, Instant},
 };
 
-fn signature_thread(receiver: flume::Receiver<Box<dyn FnOnce() + Send>>, id: usize) {
-    let guard = MetricsGuard::guard(id);
+fn spawner_thread(
+    receiver: flume::Receiver<Box<dyn FnOnce() + Send>>,
+    name: &'static str,
+    id: usize,
+) {
+    let guard = MetricsGuard::guard(name, id);
 
     while let Ok(f) = receiver.recv() {
         let start = Instant::now();
-        metrics::increment_counter!("relay.signature-thread.operation.start", "id" => id.to_string());
+        metrics::increment_counter!(format!("relay.{name}.operation.start"), "id" => id.to_string());
         let res = std::panic::catch_unwind(AssertUnwindSafe(f));
-        metrics::increment_counter!("relay.signature-thread.operation.end", "complete" => res.is_ok().to_string(), "id" => id.to_string());
-        metrics::histogram!("relay.signature-thread.operation.duration", start.elapsed().as_secs_f64(), "complete" => res.is_ok().to_string(), "id" => id.to_string());
+        metrics::increment_counter!(format!("relay.{name}.operation.end"), "complete" => res.is_ok().to_string(), "id" => id.to_string());
+        metrics::histogram!(format!("relay.{name}.operation.duration"), start.elapsed().as_secs_f64(), "complete" => res.is_ok().to_string(), "id" => id.to_string());
 
         if let Err(e) = res {
-            tracing::warn!("Signature fn panicked: {e:?}");
+            tracing::warn!("{name} fn panicked: {e:?}");
         }
     }
 
@@ -26,21 +30,24 @@ fn signature_thread(receiver: flume::Receiver<Box<dyn FnOnce() + Send>>, id: usi
 
 #[derive(Clone, Debug)]
 pub(crate) struct Spawner {
+    name: &'static str,
     sender: Option<flume::Sender<Box<dyn FnOnce() + Send>>>,
     threads: Option<Arc<Vec<JoinHandle<()>>>>,
 }
 
 struct MetricsGuard {
+    name: &'static str,
     id: usize,
     start: Instant,
     armed: bool,
 }
 
 impl MetricsGuard {
-    fn guard(id: usize) -> Self {
-        metrics::increment_counter!("relay.signature-thread.launched", "id" => id.to_string());
+    fn guard(name: &'static str, id: usize) -> Self {
+        metrics::increment_counter!(format!("relay.{name}.launched"), "id" => id.to_string());
 
         Self {
+            name,
             id,
             start: Instant::now(),
             armed: true,
@@ -54,30 +61,31 @@ impl MetricsGuard {
 
 impl Drop for MetricsGuard {
     fn drop(&mut self) {
-        metrics::increment_counter!("relay.signature-thread.closed", "clean" => (!self.armed).to_string(), "id" => self.id.to_string());
-        metrics::histogram!("relay.signature-thread.duration", self.start.elapsed().as_secs_f64(), "clean" => (!self.armed).to_string(), "id" => self.id.to_string());
-        tracing::warn!("Stopping signature thread");
+        metrics::increment_counter!(format!("relay.{}.closed", self.name), "clean" => (!self.armed).to_string(), "id" => self.id.to_string());
+        metrics::histogram!(format!("relay.{}.duration", self.name), self.start.elapsed().as_secs_f64(), "clean" => (!self.armed).to_string(), "id" => self.id.to_string());
+        tracing::warn!("Stopping {} - {}", self.name, self.id);
     }
 }
 
 impl Spawner {
-    pub(crate) fn build(threads: usize) -> std::io::Result<Self> {
+    pub(crate) fn build(name: &'static str, threads: usize) -> std::io::Result<Self> {
         let (sender, receiver) = flume::bounded(8);
 
-        tracing::warn!("Launching {threads} signature threads");
+        tracing::warn!("Launching {threads} {name}s");
 
         let threads = (0..threads)
             .map(|i| {
                 let receiver = receiver.clone();
                 std::thread::Builder::new()
-                    .name(format!("signature-thread-{i}"))
+                    .name(format!("{name}-{i}"))
                     .spawn(move || {
-                        signature_thread(receiver, i);
+                        spawner_thread(receiver, name, i);
                     })
             })
             .collect::<Result<Vec<_>, _>>()?;
 
         Ok(Spawner {
+            name,
             sender: Some(sender),
             threads: Some(Arc::new(threads)),
         })
@@ -89,6 +97,7 @@ impl Drop for Spawner {
         self.sender.take();
 
         if let Some(threads) = self.threads.take().and_then(Arc::into_inner) {
+            tracing::warn!("Joining {}s", self.name);
             for thread in threads {
                 let _ = thread.join();
             }