experimental h3

src/proxy/proxy_h3.rs

@@ -38,7 +38,7 @@ where
         while let Some((req, stream)) = h3_conn
           .accept()
           .await
-          .map_err(|e| anyhow!("HTTP/3 accept failed (likely timeout): {}", e))?
+          .map_err(|e| anyhow!("HTTP/3 accept failed: {}", e))?
         {
           info!("HTTP/3 new request received");
 

src/proxy/proxy_tls.rs

@@ -79,6 +79,7 @@ where
     #[cfg(feature = "h3")]
     let listener_service_h3 = async {
       // TODO: Work around to initially serve incoming connection
+      // かなり適当。エラーが出たり出なかったり。原因がわからない…
       let tls_app_names: Vec<String> = self
         .backends
         .apps
@@ -95,40 +96,55 @@ where
       let server_crypto = backend_serve.get_tls_server_config().unwrap();
       let server_config_h3 = quinn::ServerConfig::with_crypto(Arc::new(server_crypto));
 
-      let (endpoint, mut incoming) =
+      let (endpoint, incoming) =
         quinn::Endpoint::server(server_config_h3, self.listening_on).unwrap();
       debug!("HTTP/3 UDP listening on {}", endpoint.local_addr().unwrap());
 
-      // let peekable_incoming = incoming.peekable();
-
-      while let Some(mut conn) = incoming.next().await {
-        let hsd = conn.handshake_data().await;
+      let mut p = incoming.peekable();
+      loop {
+        // TODO: Not sure if this properly works to handle multiple "server_name"s to host multiple hosts.
+        // peek() should work for that.
+        if let Some(peeked_conn) = std::pin::Pin::new(&mut p).peek_mut().await {
+          let hsd = peeked_conn.handshake_data().await;
           let hsd_downcast = hsd?
             .downcast::<quinn::crypto::rustls::HandshakeData>()
             .unwrap();
           let svn = if let Some(sni) = hsd_downcast.server_name {
-          info!("HTTP/3 connection incoming (SNI {:?})", sni);
             sni
           } else {
             debug!("HTTP/3 no SNI is given");
             continue;
           };
-
           let new_server_crypto = if let Some(p) = self.fetch_server_crypto(&svn) {
             p
           } else {
             continue;
           };
           // Set ServerConfig::set_server_config for given SNI
-        let new_server_config_h3 = quinn::ServerConfig::with_crypto(Arc::new(new_server_crypto));
+          let mut new_server_config_h3 =
+            quinn::ServerConfig::with_crypto(Arc::new(new_server_crypto));
+          if svn == "localhost" {
+            new_server_config_h3.concurrent_connections(512);
+          }
+          info!(
+            "HTTP/3 connection incoming (SNI {:?}): Overwrite ServerConfig",
+            svn
+          );
           endpoint.set_server_config(Some(new_server_config_h3));
+        }
 
+        // Then acquire actual connection
+        let peekable_incoming = std::pin::Pin::new(&mut p);
+        if let Some(conn) = peekable_incoming.get_mut().next().await {
           let fut = self.clone().client_serve_h3(conn);
           self.globals.runtime_handle.spawn(async {
             if let Err(e) = fut.await {
               warn!("QUIC or HTTP/3 connection failed: {}", e)
             }
           });
+        } else {
+          break;
+        }
       }
       endpoint.wait_idle().await;
       Ok(()) as Result<()>