Implement close notify in server close

Signed-off-by: Eloi DEMOLIS <eloi.demolis@clever-cloud.com>

Author: Wonshtrum

lib/src/protocol/mux/h1.rs

@@ -141,7 +141,7 @@ impl<Front: SocketHandler> ConnectionH1<Front> {
         kawa.prepare(&mut kawa::h1::BlockConverter);
         debug_kawa(kawa);
         let bufs = kawa.as_io_slice();
-        if bufs.is_empty() {
+        if bufs.is_empty() && !self.socket.socket_wants_write() {
             self.readiness.interest.remove(Ready::WRITABLE);
             return MuxResult::Continue;
         }
@@ -157,7 +157,9 @@ impl<Front: SocketHandler> ConnectionH1<Front> {
                 parts.metrics.bout += size;
             }
         }
-        if update_readiness_after_write(size, status, &mut self.readiness) {
+        if update_readiness_after_write(size, status, &mut self.readiness)
+            || self.socket.socket_wants_write()
+        {
             return MuxResult::Continue;
         }
 
@@ -272,7 +274,12 @@ impl<Front: SocketHandler> ConnectionH1<Front> {
             }
             Position::Client(_, _, BackendStatus::Connecting(_))
             | Position::Client(_, _, BackendStatus::Connected) => {}
-            Position::Server => unreachable!(),
+            Position::Server => {
+                println_!("H1 SENDING CLOSE NOTIFY");
+                self.socket.socket_close();
+                let _ = self.socket.socket_write_vectored(&[]);
+                return;
+            }
         }
         // reconnection is handled by the server
         let StreamState::Linked(token) = context.streams[self.stream].state else {

lib/src/protocol/mux/h2.rs

@@ -605,6 +605,7 @@ impl<Front: SocketHandler> ConnectionH2<Front> {
                 priorities.sort();
 
                 println_!("PRIORITIES: {priorities:?}");
+                let mut socket_write = false;
                 'outer: for stream_id in priorities {
                     let global_stream_id = *self.streams.get(stream_id).unwrap();
                     let stream = &mut context.streams[global_stream_id];
@@ -621,6 +622,7 @@ impl<Front: SocketHandler> ConnectionH2<Front> {
                         debug_kawa(kawa);
                     }
                     while !kawa.out.is_empty() {
+                        socket_write = true;
                         let bufs = kawa.as_io_slice();
                         let (size, status) = self.socket.socket_write_vectored(&bufs);
                         kawa.consume(size);
@@ -670,7 +672,11 @@ impl<Front: SocketHandler> ConnectionH2<Front> {
                     self.streams.remove(&stream_id).unwrap();
                 }
 
-                if self.expect_write.is_none() {
+                if self.socket.socket_wants_write() {
+                    if !socket_write {
+                        self.socket.socket_write(&[]);
+                    }
+                } else if self.expect_write.is_none() {
                     // We wrote everything
                     self.readiness.interest.remove(Ready::WRITABLE);
                 }
@@ -1045,7 +1051,12 @@ impl<Front: SocketHandler> ConnectionH2<Front> {
         match self.position {
             Position::Client(_, _, BackendStatus::KeepAlive) => unreachable!(),
             Position::Client(..) => {}
-            Position::Server => unreachable!(),
+            Position::Server => {
+                println_!("H2 SENDING CLOSE NOTIFY");
+                self.socket.socket_close();
+                let _ = self.socket.socket_write_vectored(&[]);
+                return;
+            }
         }
         // reconnection is handled by the server for each stream separately
         for global_stream_id in self.streams.values() {

lib/src/protocol/mux/mod.rs

@@ -151,6 +151,7 @@ fn set_default_answer(stream: &mut Stream, readiness: &mut Readiness, code: u16)
         fill_default_301_answer(kawa, host, uri);
     } else {
         fill_default_answer(kawa, code);
+        context.keep_alive_frontend = false;
     }
     context.status = Some(code);
     stream.state = StreamState::Unlinked;
@@ -450,7 +451,7 @@ impl<Front: SocketHandler> Connection<Front> {
                 );
                 println_!("--------------- CONNECTION CLOSE: {backend_borrow:#?}");
             }
-            Position::Server => todo!(),
+            Position::Server => {}
         }
         match self {
             Connection::H1(c) => c.close(context, endpoint),
@@ -1586,6 +1587,8 @@ impl<Front: SocketHandler + std::fmt::Debug, L: ListenerHandler + L7ListenerHand
         println_!("FRONTEND: {:#?}", self.frontend);
         println_!("BACKENDS: {:#?}", self.router.backends);
 
+        self.frontend.close(&mut self.context, EndpointClient(&mut self.router));
+
         for (token, client) in &mut self.router.backends {
             let proxy_borrow = proxy.borrow();
             client.timeout_container().cancel();