fix(cli): fail continuous runs on peer closure

Keep PeerClosed as a distinct successful library outcome while treating it as an error at the CLI and TUI boundary for uninterrupted continuous runs.

Track aggregate peer-close outcomes independently of bounded recent history and cover finite, continuous, grouped, mixed-failure, interruption, and TUI status behavior.

crates/irtt-cli/src/cmd/client/run.rs

@@ -23,7 +23,9 @@ use super::{
 #[cfg(feature = "stats")]
 use crate::shared::client::expected_probe_count;
 use crate::shared::client::{
-    is_shutdown_requested, session::should_print_final_summary, ClientSession,
+    is_shutdown_requested,
+    session::{peer_close_run_error, should_print_final_summary},
+    ClientSession,
 };
 
 #[cfg(feature = "stats")]
@@ -152,6 +154,12 @@ pub fn run_stream(
     print_events_with_stats(&mut stream_output, &events, Some(target_label), &mut stats)?;
     #[cfg(not(feature = "stats"))]
     print_events_with_stats(&mut stream_output, &events, Some(target_label))?;
+    interrupted |= is_shutdown_requested(shutdown_requested);
+    let peer_close_error = peer_close_run_error(
+        continuous,
+        interrupted,
+        if session.is_peer_closed() { 1 } else { 0 },
+    );
     let print_final_summary = should_print_final_summary(continuous, interrupted);
     stream_output.print_final_summary = print_final_summary;
     stream_output.show_running_only_summary_note = continuous && interrupted && print_final_summary;
@@ -160,6 +168,9 @@ pub fn run_stream(
     #[cfg(not(feature = "stats"))]
     stream_output.print_summary()?;
     stream_output.out.flush()?;
+    if let Some(error) = peer_close_error {
+        return Err(error.into());
+    }
     Ok(())
 }
 
@@ -403,9 +414,7 @@ fn run_group_stream(
         eprintln!("{warning}");
     }
 
-    if outcome.end_reason == ManagedGroupEndReason::Cancelled && !interrupted {
-        return Err("managed client group was cancelled".into());
-    }
+    interrupted |= is_shutdown_requested(shutdown_requested);
     for target in &outcome.targets {
         if terminal_targets.insert(target.id.as_str().to_owned()) {
             report_target_failure(target);
@@ -413,11 +422,19 @@ fn run_group_stream(
     }
     let successful_targets = outcome.successful_target_outcomes;
     let failed_targets = outcome.failed_target_outcomes;
-    if !interrupted && successful_targets == 0 && failed_targets > 0 {
-        return Err(
-            format!("no managed target completed successfully ({failed_targets} failed)").into(),
-        );
-    }
+    let terminal_error = if outcome.end_reason == ManagedGroupEndReason::Cancelled && !interrupted {
+        Some("managed client group was cancelled".to_owned())
+    } else if let Some(error) =
+        peer_close_run_error(continuous, interrupted, outcome.peer_closed_target_outcomes)
+    {
+        Some(error)
+    } else if !interrupted && successful_targets == 0 && failed_targets > 0 {
+        Some(format!(
+            "no managed target completed successfully ({failed_targets} failed)"
+        ))
+    } else {
+        None
+    };
 
     let print_final_summary = should_print_final_summary(continuous, interrupted);
     stream_output.print_final_summary = print_final_summary;
@@ -437,6 +454,9 @@ fn run_group_stream(
         stream_output.print_summary()?;
     }
     stream_output.out.flush()?;
+    if let Some(error) = terminal_error {
+        return Err(error.into());
+    }
     Ok(())
 }
 

crates/irtt-cli/src/cmd/tui/run.rs

@@ -14,7 +14,7 @@ use irtt_client::{
 
 use crate::{
     cmd::tui::args::{ResolvedTuiTarget, TuiArgs},
-    shared::client::{is_shutdown_requested, ClientSession},
+    shared::client::{is_shutdown_requested, session::peer_close_run_error, ClientSession},
 };
 
 use super::ui::{should_render, TuiConfig, TuiState, TuiStatus, TuiTerminal};
@@ -129,6 +129,16 @@ pub fn run_tui(
 
     let events = session.close()?;
     state.process_events(&events);
+    interrupted |= is_shutdown_requested(shutdown_requested);
+    if let Some(error) = peer_close_run_error(
+        continuous,
+        interrupted,
+        if session.is_peer_closed() { 1 } else { 0 },
+    ) {
+        state.set_run_error(error.clone());
+        render_if_due(&mut terminal, &state, &mut next_render, true)?;
+        return Err(error.into());
+    }
     state.set_status(TuiStatus::Complete);
     render_if_due(&mut terminal, &state, &mut next_render, true)?;
     Ok(())
@@ -249,6 +259,7 @@ fn run_group_tui(
         }
     }
 
+    interrupted |= is_shutdown_requested(shutdown_requested);
     if outcome.end_reason == ManagedGroupEndReason::Cancelled && !interrupted {
         return match exit {
             GroupLoopExit::IdleGraceElapsed => {
@@ -262,6 +273,15 @@ fn run_group_tui(
             }
         };
     }
+    if let Some(error) = peer_close_run_error(
+        args.is_continuous(),
+        interrupted,
+        outcome.peer_closed_target_outcomes,
+    ) {
+        state.set_run_error(error.clone());
+        render_if_due(terminal, state, next_render, true)?;
+        return Err(error.into());
+    }
     let successful_targets = outcome.successful_target_outcomes;
     let failed_targets = outcome.failed_target_outcomes;
     if !interrupted && successful_targets == 0 && failed_targets > 0 {

crates/irtt-cli/src/cmd/tui/ui.rs

@@ -409,6 +409,12 @@ impl TuiState {
         self.push_event(format!("error {message}"));
     }
 
+    pub(super) fn set_run_error(&mut self, message: String) {
+        self.status = TuiStatus::Error;
+        self.last_warning = Some(message.clone());
+        self.push_event(format!("error {message}"));
+    }
+
     pub(super) fn clear_visible_history(&mut self) {
         for target in &mut self.targets {
             target.graph_history.clear();
@@ -2412,6 +2418,23 @@ mod tests {
             .is_some_and(|warning| warning.contains("pending probe limit")));
     }
 
+    #[test]
+    fn run_error_preserves_peer_closed_target_status() {
+        let mut state = TuiState::with_target_labels(TuiConfig::default(), ["a".to_owned()]);
+        state.process_target_outcome(&target_outcome("a", ManagedTargetEndReason::PeerClosed));
+
+        state.set_run_error(
+            "continuous run ended because of peer closure (1 target session)".to_owned(),
+        );
+
+        assert_eq!(state.status, TuiStatus::Error);
+        assert_eq!(state.targets[0].status, TargetStatus::Closed);
+        assert!(state
+            .last_warning
+            .as_deref()
+            .is_some_and(|warning| warning.contains("peer closure")));
+    }
+
     #[test]
     fn all_failed_terminal_outcomes_set_error_status() {
         let mut state =

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

@@ -106,6 +106,10 @@ impl ClientSession {
         self.client.close()
     }
 
+    pub fn is_peer_closed(&self) -> bool {
+        self.client.is_peer_closed()
+    }
+
     pub fn next_send_deadline(&self) -> Option<Instant> {
         self.client.next_send_deadline()
     }
@@ -139,6 +143,25 @@ pub fn should_print_final_summary(continuous: bool, interrupted: bool) -> bool {
     !continuous || interrupted
 }
 
+pub fn peer_close_run_error(
+    continuous: bool,
+    interrupted: bool,
+    peer_closed_target_outcomes: u64,
+) -> Option<String> {
+    if !continuous || interrupted || peer_closed_target_outcomes == 0 {
+        return None;
+    }
+
+    let sessions = if peer_closed_target_outcomes == 1 {
+        "target session"
+    } else {
+        "target sessions"
+    };
+    Some(format!(
+        "continuous run ended because of peer closure ({peer_closed_target_outcomes} {sessions})"
+    ))
+}
+
 pub fn final_drain_duration(probe_timeout: Duration) -> Duration {
     probe_timeout.min(MAX_FINAL_DRAIN)
 }
@@ -201,6 +224,21 @@ mod tests {
         assert!(!should_drain_final(true, false));
     }
 
+    #[test]
+    fn peer_close_run_error_is_run_mode_and_interruption_aware() {
+        assert_eq!(peer_close_run_error(false, false, 1), None);
+        assert_eq!(peer_close_run_error(true, false, 0), None);
+        assert_eq!(peer_close_run_error(true, true, 1), None);
+        assert_eq!(
+            peer_close_run_error(true, false, 1).as_deref(),
+            Some("continuous run ended because of peer closure (1 target session)")
+        );
+        assert_eq!(
+            peer_close_run_error(true, false, 3).as_deref(),
+            Some("continuous run ended because of peer closure (3 target sessions)")
+        );
+    }
+
     #[test]
     fn peer_close_followed_by_session_cleanup_is_successful() {
         let params = test_params(None, Duration::from_millis(10));
@@ -221,6 +259,7 @@ mod tests {
             .iter()
             .any(|event| matches!(event, ClientEvent::SessionClosed { .. })));
         assert!(!session.should_continue(&shutdown_requested));
+        assert!(session.is_peer_closed());
 
         session.drain_final(|_| {}).unwrap();
         assert!(session.poll_timeouts().unwrap().is_empty());

crates/irtt-cli/tests/client_multi_target.rs

@@ -124,6 +124,76 @@ fn single_target_custom_target_column_renders_positional_label() {
     );
 }
 
+#[test]
+fn finite_single_target_peer_close_exits_successfully() {
+    let server = start_peer_close_server(test_params(
+        Some(Duration::from_millis(40)),
+        Duration::from_millis(10),
+    ));
+    let mut command = Command::new(env!("CARGO_BIN_EXE_irtt-cli"));
+    command.args([
+        "--duration",
+        "40ms",
+        "--interval",
+        "10ms",
+        "--format",
+        "csv",
+        "--columns",
+        "seq",
+        "--header",
+        "never",
+        &server.addr.to_string(),
+    ]);
+
+    let output = run_with_timeout(command, Duration::from_secs(3));
+    server.join();
+
+    assert!(
+        output.status.success(),
+        "status={:?}\nstderr={}",
+        output.status.code(),
+        String::from_utf8_lossy(&output.stderr)
+    );
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let stderr = String::from_utf8(output.stderr).unwrap();
+    assert!(!stdout.trim().is_empty(), "{stdout}");
+    assert!(!stderr.contains("peer closure"), "{stderr}");
+}
+
+#[test]
+fn continuous_single_target_peer_close_exits_nonzero() {
+    let server = start_peer_close_server(test_params(None, Duration::from_millis(10)));
+    let mut command = Command::new(env!("CARGO_BIN_EXE_irtt-cli"));
+    command.args([
+        "--duration",
+        "0s",
+        "--interval",
+        "10ms",
+        "--format",
+        "csv",
+        "--columns",
+        "seq",
+        "--header",
+        "never",
+        &server.addr.to_string(),
+    ]);
+
+    let output = run_with_timeout(command, Duration::from_secs(3));
+    server.join();
+
+    assert!(
+        !output.status.success(),
+        "status={:?}\nstdout={}",
+        output.status.code(),
+        String::from_utf8_lossy(&output.stdout)
+    );
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let stderr = String::from_utf8(output.stderr).unwrap();
+    assert!(!stdout.trim().is_empty(), "{stdout}");
+    assert!(stderr.contains("continuous run"), "{stderr}");
+    assert!(stderr.contains("peer closure"), "{stderr}");
+}
+
 #[test]
 fn multi_target_csv_emits_rows_for_both_labels() {
     let params = test_params(Some(Duration::from_millis(40)), Duration::from_millis(10));
@@ -171,9 +241,105 @@ fn multi_target_csv_emits_rows_for_both_labels() {
 }
 
 #[test]
-fn continuous_mixed_success_and_open_failure_exits_and_reports_failure() {
+fn finite_multi_target_peer_close_is_accepted_as_completion() {
+    let params = test_params(Some(Duration::from_millis(40)), Duration::from_millis(10));
+    let a = start_peer_close_server(params.clone());
+    let b = start_peer_close_server(params);
+    let mut command = Command::new(env!("CARGO_BIN_EXE_irtt-cli"));
+    command.args([
+        "--duration",
+        "40ms",
+        "--interval",
+        "10ms",
+        "--format",
+        "csv",
+        "--columns",
+        "target,seq",
+        "--header",
+        "never",
+        "--target",
+        &format!("a={}", a.addr),
+        "--target",
+        &format!("b={}", b.addr),
+    ]);
+
+    let output = run_with_timeout(command, Duration::from_secs(3));
+    a.join();
+    b.join();
+
+    assert!(
+        output.status.success(),
+        "status={:?}\nstderr={}",
+        output.status.code(),
+        String::from_utf8_lossy(&output.stderr)
+    );
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let stderr = String::from_utf8(output.stderr).unwrap();
+    assert!(
+        stdout.lines().any(|line| line.starts_with("a,")),
+        "{stdout}"
+    );
+    assert!(
+        stdout.lines().any(|line| line.starts_with("b,")),
+        "{stdout}"
+    );
+    assert!(!stderr.contains("peer closure"), "{stderr}");
+}
+
+#[test]
+fn continuous_all_peer_closed_targets_exit_nonzero() {
     let params = test_params(None, Duration::from_millis(10));
-    let success = start_peer_close_server(params.clone());
+    let a = start_peer_close_server(params.clone());
+    let b = start_peer_close_server(params);
+    let mut command = Command::new(env!("CARGO_BIN_EXE_irtt-cli"));
+    command.args([
+        "--duration",
+        "0s",
+        "--interval",
+        "10ms",
+        "--format",
+        "csv",
+        "--columns",
+        "target,seq",
+        "--header",
+        "never",
+        "--target",
+        &format!("a={}", a.addr),
+        "--target",
+        &format!("b={}", b.addr),
+    ]);
+
+    let output = run_with_timeout(command, Duration::from_secs(3));
+    a.join();
+    b.join();
+
+    assert!(
+        !output.status.success(),
+        "status={:?}\nstdout={}",
+        output.status.code(),
+        String::from_utf8_lossy(&output.stdout)
+    );
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let stderr = String::from_utf8(output.stderr).unwrap();
+    assert!(
+        stdout.lines().any(|line| line.starts_with("a,")),
+        "{stdout}"
+    );
+    assert!(
+        stdout.lines().any(|line| line.starts_with("b,")),
+        "{stdout}"
+    );
+    assert!(stderr.contains("continuous run"), "{stderr}");
+    assert!(
+        stderr.contains("peer closure (2 target sessions)"),
+        "{stderr}"
+    );
+}
+
+#[test]
+fn continuous_mixed_peer_close_and_open_failure_exits_nonzero() {
+    let params = test_params(None, Duration::from_millis(10));
+    let peer_closed = start_peer_close_server(params.clone());
     let failure = start_open_failure_server(params);
     let mut command = Command::new(env!("CARGO_BIN_EXE_irtt-cli"));
     command.args([
@@ -188,29 +354,33 @@ fn continuous_mixed_success_and_open_failure_exits_and_reports_failure() {
         "--header",
         "never",
         "--target",
-        &format!("success={}", success.addr),
+        &format!("peer={}", peer_closed.addr),
         "--target",
         &format!("failure={}", failure.addr),
     ]);
 
     let output = run_with_timeout(command, Duration::from_secs(3));
-    success.join();
+    peer_closed.join();
     failure.join();
 
     assert!(
-        output.status.success(),
-        "status={:?}\nstderr={}",
+        !output.status.success(),
+        "status={:?}\nstdout={}",
         output.status.code(),
-        String::from_utf8_lossy(&output.stderr)
+        String::from_utf8_lossy(&output.stdout)
     );
     let stdout = String::from_utf8(output.stdout).unwrap();
     let stderr = String::from_utf8(output.stderr).unwrap();
     assert!(
-        stdout.lines().any(|line| line.starts_with("success,")),
+        stdout.lines().any(|line| line.starts_with("peer,")),
         "{stdout}"
     );
     assert!(stderr.contains("target failure failed"), "{stderr}");
     assert!(stderr.contains("zero token without close flag"), "{stderr}");
+    assert!(
+        stderr.contains("peer closure (1 target session)"),
+        "{stderr}"
+    );
 }
 
 #[test]

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

@@ -214,6 +214,12 @@ pub struct ManagedGroupOutcome {
     pub total_target_outcomes: u64,
     /// Number of target outcomes classified as successful.
     pub successful_target_outcomes: u64,
+    /// Number of target outcomes that ended because the peer closed the session.
+    ///
+    /// Peer closure remains a successful library-level outcome and is also
+    /// included in [`Self::successful_target_outcomes`]. This aggregate covers
+    /// outcomes omitted from the bounded [`Self::targets`] snapshot.
+    pub peer_closed_target_outcomes: u64,
     /// Number of target outcomes carrying structured failure details.
     pub failed_target_outcomes: u64,
     /// Number of older outcomes omitted from [`Self::targets`].
@@ -637,6 +643,7 @@ struct TargetOutcomeHistory {
     recent: VecDeque<ManagedTargetOutcome>,
     total: u64,
     successful: u64,
+    peer_closed: u64,
     failed: u64,
     discarded: u64,
 }
@@ -647,6 +654,9 @@ impl TargetOutcomeHistory {
         if outcome.is_success() {
             self.successful = self.successful.saturating_add(1);
         }
+        if matches!(&outcome.end_reason, ManagedTargetEndReason::PeerClosed) {
+            self.peer_closed = self.peer_closed.saturating_add(1);
+        }
         if outcome.end_reason.failure().is_some() {
             self.failed = self.failed.saturating_add(1);
         }
@@ -663,6 +673,7 @@ impl TargetOutcomeHistory {
             targets: self.recent.into_iter().collect(),
             total_target_outcomes: self.total,
             successful_target_outcomes: self.successful,
+            peer_closed_target_outcomes: self.peer_closed,
             failed_target_outcomes: self.failed,
             discarded_target_outcomes: self.discarded,
         }
@@ -2146,6 +2157,51 @@ mod tests {
         assert_eq!(target.end_reason, ManagedTargetEndReason::PeerClosed);
         assert_eq!(target.packets_sent, 1);
         assert_eq!(target.replies_received, 1);
+        assert_eq!(outcome.total_target_outcomes, 1);
+        assert_eq!(outcome.successful_target_outcomes, 1);
+        assert_eq!(outcome.peer_closed_target_outcomes, 1);
+        assert_eq!(outcome.failed_target_outcomes, 0);
+    }
+
+    #[test]
+    fn peer_close_aggregate_survives_bounded_recent_history() {
+        let remote: SocketAddr = "127.0.0.1:2112".parse().unwrap();
+        let mut history = TargetOutcomeHistory::default();
+        history.record(ManagedTargetOutcome {
+            id: TargetId::from("peer"),
+            remote,
+            end_reason: ManagedTargetEndReason::PeerClosed,
+            packets_sent: 1,
+            replies_received: 1,
+            duplicates: 0,
+            late: 0,
+            warning_events: 0,
+        });
+        for index in 0..MANAGED_GROUP_OUTCOME_HISTORY_LIMIT {
+            history.record(ManagedTargetOutcome {
+                id: TargetId::from(format!("removed-{index}")),
+                remote,
+                end_reason: ManagedTargetEndReason::Removed,
+                packets_sent: 0,
+                replies_received: 0,
+                duplicates: 0,
+                late: 0,
+                warning_events: 0,
+            });
+        }
+
+        let outcome = history.into_group_outcome(ManagedGroupEndReason::AllTargetsComplete);
+        let expected_total = u64::try_from(MANAGED_GROUP_OUTCOME_HISTORY_LIMIT + 1).unwrap();
+        assert_eq!(outcome.total_target_outcomes, expected_total);
+        assert_eq!(outcome.successful_target_outcomes, 1);
+        assert_eq!(outcome.peer_closed_target_outcomes, 1);
+        assert_eq!(outcome.failed_target_outcomes, 0);
+        assert_eq!(outcome.targets.len(), MANAGED_GROUP_OUTCOME_HISTORY_LIMIT);
+        assert_eq!(outcome.discarded_target_outcomes, 1);
+        assert!(outcome
+            .targets
+            .iter()
+            .all(|target| target.end_reason == ManagedTargetEndReason::Removed));
     }
 
     #[test]
@@ -2196,6 +2252,10 @@ mod tests {
                     )
         )));
         assert_eq!(outcome.targets.len(), 2);
+        assert_eq!(outcome.total_target_outcomes, 2);
+        assert_eq!(outcome.successful_target_outcomes, 1);
+        assert_eq!(outcome.peer_closed_target_outcomes, 1);
+        assert_eq!(outcome.failed_target_outcomes, 1);
     }
 
     #[test]
@@ -2778,6 +2838,7 @@ mod tests {
         assert_eq!(published, churn_count + 1);
         assert_eq!(outcome.total_target_outcomes, expected_total);
         assert_eq!(outcome.successful_target_outcomes, 0);
+        assert_eq!(outcome.peer_closed_target_outcomes, 0);
         assert_eq!(outcome.failed_target_outcomes, 0);
         assert_eq!(outcome.targets.len(), MANAGED_GROUP_OUTCOME_HISTORY_LIMIT);
         assert_eq!(