fix(client): handle peer-initiated session closure gracefully

crates/irtt-cli/src/shared/client/session.rs

@@ -40,12 +40,16 @@ impl ClientSession {
             events.extend(self.client.send_probe()?);
         }
         events.extend(self.client.recv_available(RECV_BUDGET)?);
+        if self.client.is_peer_closed() {
+            return Ok(events);
+        }
         events.extend(self.client.poll_timeouts()?);
         Ok(events)
     }
 
     pub fn should_continue(&self, shutdown_requested: &AtomicBool) -> bool {
         !is_shutdown_requested(shutdown_requested)
+            && !self.client.is_peer_closed()
             && (self.continuous || self.client.next_send_deadline().is_some())
     }
 
@@ -59,12 +63,20 @@ impl ClientSession {
     {
         let deadline = Instant::now() + final_drain_duration(self.client.probe_timeout());
         loop {
+            if self.client.is_peer_closed() {
+                break;
+            }
+
             let mut received = false;
 
             let events = self.client.recv_available(RECV_BUDGET)?;
             received |= !events.is_empty();
             on_events(&events);
 
+            if self.client.is_peer_closed() {
+                break;
+            }
+
             let events = self.client.poll_timeouts()?;
             received |= !events.is_empty();
             on_events(&events);
@@ -81,10 +93,16 @@ impl ClientSession {
     }
 
     pub fn poll_timeouts(&mut self) -> Result<Vec<ClientEvent>, irtt_client::ClientError> {
+        if self.client.is_peer_closed() {
+            return Ok(vec![]);
+        }
         self.client.poll_timeouts()
     }
 
     pub fn close(&mut self) -> Result<Vec<ClientEvent>, irtt_client::ClientError> {
+        if self.client.is_peer_closed() {
+            return Ok(vec![]);
+        }
         self.client.close()
     }
 

crates/irtt-client/src/client.rs

@@ -359,6 +359,9 @@ impl Client {
                 break;
             }
             all_events.extend(events);
+            if self.is_peer_closed() {
+                break;
+            }
         }
         Ok(all_events)
     }

crates/irtt-client/src/managed/runner.rs

@@ -224,7 +224,9 @@ fn run_client(
                 &mut counters,
                 client.recv_available(MANAGED_RECV_BUDGET)?,
             );
+            if !client.is_peer_closed() {
                 publish_events(&hub, &mut counters, client.poll_timeouts()?);
+            }
             break;
         }
 
@@ -243,6 +245,9 @@ fn run_client(
             &mut counters,
             client.recv_available(MANAGED_RECV_BUDGET)?,
         );
+        if client.is_peer_closed() {
+            break;
+        }
         publish_events(&hub, &mut counters, client.poll_timeouts()?);
 
         if client.is_run_complete() {
@@ -257,8 +262,10 @@ fn run_client(
     }
 
     let packets_sent = client.packets_sent();
+    if !client.is_peer_closed() {
         let close_events = client.close()?;
         publish_events(&hub, &mut counters, close_events);
+    }
 
     Ok(SessionOutcome {
         end_reason: if cancelled {
@@ -295,12 +302,20 @@ fn drain_final_late_replies(
 
     let deadline = Instant::now() + MANAGED_FINAL_DRAIN;
     while Instant::now() < deadline && client.has_timed_out_metadata() {
+        if client.is_peer_closed() {
+            break;
+        }
+
         let mut published = false;
 
         let events = client.recv_available(MANAGED_RECV_BUDGET)?;
         published |= !events.is_empty();
         publish_events(hub, counters, events);
 
+        if client.is_peer_closed() {
+            break;
+        }
+
         let events = client.poll_timeouts()?;
         published |= !events.is_empty();
         publish_events(hub, counters, events);