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use std::sync::Mutex as StdMutex;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering;
use std::time::Duration;
use codex_code_mode_protocol::CellId;
use codex_code_mode_protocol::CodeModeNestedToolCall;
use codex_code_mode_protocol::CodeModeSessionCellExecutionLimits;
use codex_code_mode_protocol::CodeModeSessionDelegate;
use codex_code_mode_protocol::ExecuteRequest;
use codex_code_mode_protocol::NotificationFuture;
use codex_code_mode_protocol::ToolInvocationFuture;
use codex_code_mode_protocol::WaitRequest;
use codex_code_mode_protocol::host::CapabilitySet;
use codex_code_mode_protocol::host::ClientToHost;
use codex_code_mode_protocol::host::DelegateRequest;
use codex_code_mode_protocol::host::DelegateRequestId;
use codex_code_mode_protocol::host::EncodedFrame;
use codex_code_mode_protocol::host::HostRequest;
use codex_code_mode_protocol::host::HostResponse;
use codex_code_mode_protocol::host::HostToClient;
use codex_code_mode_protocol::host::MAX_PENDING_DELEGATE_CALLS;
use codex_code_mode_protocol::host::RequestId;
use codex_code_mode_protocol::host::SessionId;
use codex_code_mode_protocol::host::WireNestedToolCall;
use codex_code_mode_protocol::host::WireResult;
use codex_code_mode_protocol::host::WireRuntimeResponse;
use codex_code_mode_protocol::host::WireSessionCellExecutionLimits;
use codex_code_mode_protocol::host::WireWaitOutcome;
use codex_protocol::ToolName;
use pretty_assertions::assert_eq;
use tokio::sync::mpsc;
use tokio::sync::oneshot;
use tokio_util::sync::CancellationToken;
use super::super::Connection;
use super::super::DEFAULT_HOST_WAIT_TRANSPORT_TIMEOUT;
use super::ConnectionDriver;
use super::DriverCommand;
use super::DriverEvent;
use super::DriverLifecycle;
use super::RemoteSession;
use super::SessionCleanup;
struct DriverHarness {
command_tx: mpsc::Sender<DriverCommand>,
event_tx: mpsc::Sender<DriverEvent>,
execute_claim_tx: mpsc::UnboundedSender<RequestId>,
outgoing_rx: mpsc::Receiver<codex_code_mode_protocol::host::EncodedFrame>,
cancellation: CancellationToken,
alive: Arc<AtomicBool>,
failure: Arc<StdMutex<Option<String>>>,
driver_task: tokio::task::JoinHandle<()>,
}
impl DriverHarness {
fn start() -> Self {
let (command_tx, command_rx) = mpsc::channel(/*max_capacity*/ 16);
let (event_tx, event_rx) = mpsc::channel(/*max_capacity*/ 16);
let (outgoing_tx, outgoing_rx) = mpsc::channel(/*max_capacity*/ 16);
let cancellation = CancellationToken::new();
let alive = Arc::new(AtomicBool::new(true));
let failure = Arc::new(StdMutex::new(None));
let (driver, execute_claim_tx) = ConnectionDriver::new(
command_rx,
event_rx,
event_tx.clone(),
outgoing_tx,
DriverLifecycle {
alive: Arc::clone(&alive),
failure: Arc::clone(&failure),
cancellation: cancellation.clone(),
},
);
let driver_task = tokio::spawn(driver.run());
Self {
command_tx,
event_tx,
execute_claim_tx,
outgoing_rx,
cancellation,
alive,
failure,
driver_task,
}
}
async fn open(&mut self, session: RemoteSession) -> SessionCleanup {
let cleanup = SessionCleanup::new();
let (response_tx, response_rx) = oneshot::channel();
self.command_tx
.send(DriverCommand::OpenSession {
session: session.clone(),
limits: Default::default(),
cleanup: cleanup.clone(),
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("open command");
self.outgoing_rx.recv().await.expect("open frame");
self.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 1),
result: WireResult::Ok {
value: HostResponse::SessionReady {
session_id: session.id,
},
},
}))
.await
.expect("open response");
response_rx
.await
.expect("open reply")
.expect("open session");
cleanup
}
async fn start_cell(
&mut self,
session: RemoteSession,
request_id: i64,
cell_id: &str,
delegate: Arc<dyn CodeModeSessionDelegate>,
) -> codex_code_mode_protocol::StartedCell {
let (response_tx, response_rx) = oneshot::channel();
self.command_tx
.send(DriverCommand::Execute {
session,
delegate,
request: ExecuteRequest {
tool_call_id: format!("call-{request_id}"),
enabled_tools: Vec::new(),
source: "await new Promise(() => {})".to_string(),
yield_time_ms: Some(1),
max_output_tokens: None,
},
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("execute command");
self.outgoing_rx.recv().await.expect("execute frame");
self.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(request_id),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: CellId::new(cell_id.to_string()).into(),
},
},
}))
.await
.expect("execute response");
let delivered = response_rx
.await
.expect("execute reply")
.expect("execute session");
self.execute_claim_tx
.send(delivered.request_id)
.expect("claim execute");
delivered.started
}
async fn start_tool_delegate(&self, session: &RemoteSession, id: DelegateRequestId) {
self.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id,
session_id: session.id.clone(),
request: DelegateRequest::InvokeTool {
invocation: WireNestedToolCall {
cell_id: CellId::new("1".to_string()).into(),
runtime_tool_call_id: "tool-1".to_string(),
tool_name: ToolName::plain("slow").into(),
tool_kind: codex_code_mode_protocol::CodeModeToolKind::Function.into(),
input: None,
},
},
}))
.await
.expect("delegate request");
}
}
impl Drop for DriverHarness {
fn drop(&mut self) {
self.cancellation.cancel();
}
}
#[tokio::test]
async fn open_session_includes_nondefault_cell_execution_limits() {
let mut harness = DriverHarness::start();
let session = remote_session();
let limits = CodeModeSessionCellExecutionLimits {
max_yield_time_ms: Some(250),
max_heap_size_bytes: Some(16 * 1024 * 1024),
};
let (response_tx, _response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::OpenSession {
session: session.clone(),
limits,
cleanup: SessionCleanup::new(),
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("limited session open command");
let frame = harness
.outgoing_rx
.recv()
.await
.expect("limited session open frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&frame.into_framed_bytes())
.expect("decode limited session open request"),
ClientToHost::Request {
id: RequestId::new(/*value*/ 1),
request: HostRequest::OpenSession {
session_id: session.id,
cell_execution_limits: Some(WireSessionCellExecutionLimits {
max_yield_time_ms: Some(250),
max_heap_size_bytes: Some(16 * 1024 * 1024),
}),
},
}
);
}
#[derive(Default)]
struct RecordingDelegate {
closed_cells: StdMutex<Vec<CellId>>,
invocations: AtomicUsize,
notifications: AtomicUsize,
}
struct PanickingDelegate;
#[derive(Debug, Eq, PartialEq)]
enum HeldDelegateEvent {
Started,
Cancelled,
Finished,
CellClosed(CellId),
}
struct HeldDelegate {
events_tx: mpsc::UnboundedSender<HeldDelegateEvent>,
release: CancellationToken,
}
impl HeldDelegate {
fn new() -> (
Arc<Self>,
mpsc::UnboundedReceiver<HeldDelegateEvent>,
CancellationToken,
) {
let (events_tx, events_rx) = mpsc::unbounded_channel();
let release = CancellationToken::new();
(
Arc::new(Self {
events_tx,
release: release.clone(),
}),
events_rx,
release,
)
}
}
impl CodeModeSessionDelegate for HeldDelegate {
fn invoke_tool<'a>(
&'a self,
_invocation: CodeModeNestedToolCall,
cancellation_token: CancellationToken,
) -> ToolInvocationFuture<'a> {
let events_tx = self.events_tx.clone();
let release = self.release.clone();
Box::pin(async move {
let _ = events_tx.send(HeldDelegateEvent::Started);
cancellation_token.cancelled().await;
let _ = events_tx.send(HeldDelegateEvent::Cancelled);
release.cancelled().await;
let _ = events_tx.send(HeldDelegateEvent::Finished);
Err("cancelled".to_string())
})
}
fn notify<'a>(
&'a self,
_call_id: String,
_cell_id: CellId,
_text: String,
_cancellation_token: CancellationToken,
) -> NotificationFuture<'a> {
Box::pin(async { Ok(()) })
}
fn cell_closed(&self, cell_id: &CellId) {
let _ = self
.events_tx
.send(HeldDelegateEvent::CellClosed(cell_id.clone()));
}
}
impl CodeModeSessionDelegate for PanickingDelegate {
fn invoke_tool<'a>(
&'a self,
_invocation: CodeModeNestedToolCall,
_cancellation_token: CancellationToken,
) -> ToolInvocationFuture<'a> {
Box::pin(async { panic!("delegate panic probe") })
}
fn notify<'a>(
&'a self,
_call_id: String,
_cell_id: CellId,
_text: String,
_cancellation_token: CancellationToken,
) -> NotificationFuture<'a> {
Box::pin(async { Ok(()) })
}
fn cell_closed(&self, _cell_id: &CellId) {}
}
impl CodeModeSessionDelegate for RecordingDelegate {
fn invoke_tool<'a>(
&'a self,
_invocation: CodeModeNestedToolCall,
cancellation_token: CancellationToken,
) -> ToolInvocationFuture<'a> {
self.invocations.fetch_add(1, Ordering::Relaxed);
Box::pin(async move {
cancellation_token.cancelled().await;
Err("cancelled".to_string())
})
}
fn notify<'a>(
&'a self,
_call_id: String,
_cell_id: CellId,
_text: String,
_cancellation_token: CancellationToken,
) -> NotificationFuture<'a> {
self.notifications.fetch_add(1, Ordering::Relaxed);
Box::pin(async { Ok(()) })
}
fn cell_closed(&self, cell_id: &CellId) {
self.closed_cells
.lock()
.expect("closed cells lock")
.push(cell_id.clone());
}
}
fn remote_session() -> RemoteSession {
RemoteSession {
id: SessionId::new("session-1").expect("session ID"),
generation: 1,
}
}
async fn next_held_delegate_event(
events_rx: &mut mpsc::UnboundedReceiver<HeldDelegateEvent>,
) -> HeldDelegateEvent {
tokio::time::timeout(Duration::from_secs(1), events_rx.recv())
.await
.expect("delegate event timeout")
.expect("delegate event stream")
}
#[tokio::test]
async fn deferred_delegates_follow_cell_readiness_and_cancellation() {
let mut harness = DriverHarness::start();
let session = remote_session();
let first_delegate = Arc::new(RecordingDelegate::default());
let second_delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let (first_response_tx, first_response_rx) = oneshot::channel();
let (second_response_tx, second_response_rx) = oneshot::channel();
for (tool_call_id, response_tx, delegate) in [
("first-cell", first_response_tx, first_delegate.clone()),
("second-cell", second_response_tx, second_delegate.clone()),
] {
harness
.command_tx
.send(DriverCommand::Execute {
delegate: delegate.clone(),
session: session.clone(),
request: ExecuteRequest {
tool_call_id: tool_call_id.to_string(),
enabled_tools: Vec::new(),
source: "text('done')".to_string(),
yield_time_ms: Some(/*yield_time_ms*/ 1),
max_output_tokens: None,
},
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("execute command");
harness.outgoing_rx.recv().await.expect("execute frame");
}
let first_cell_id = CellId::new("first-cell".to_string());
let second_cell_id = CellId::new("second-cell".to_string());
let first_delegate_id = DelegateRequestId::new(/*value*/ 7);
let second_delegate_id = DelegateRequestId::new(/*value*/ 8);
let cancelled_delegate_id = DelegateRequestId::new(/*value*/ 9);
for (delegate_id, cell_id) in [
(first_delegate_id, first_cell_id.clone()),
(second_delegate_id, second_cell_id.clone()),
(cancelled_delegate_id, first_cell_id.clone()),
] {
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: delegate_id,
session_id: session.id.clone(),
request: DelegateRequest::Notify {
call_id: format!("notify-{}", cell_id.as_str()),
cell_id: (&cell_id).into(),
text: "hello".to_string(),
},
}))
.await
.expect("early delegate request");
}
harness
.event_tx
.send(DriverEvent::HostMessage(
HostToClient::CancelDelegateRequest {
id: cancelled_delegate_id,
},
))
.await
.expect("deferred delegate cancellation");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: (&second_cell_id).into(),
},
},
}))
.await
.expect("second execution-started response");
let _second_started = second_response_rx
.await
.expect("second execute response")
.expect("second started cell");
let second_response = tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("second delegate response timeout")
.expect("second delegate response frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&second_response.into_framed_bytes())
.expect("decode second delegate response"),
ClientToHost::DelegateResponse {
id: second_delegate_id,
result: WireResult::Ok {
value: codex_code_mode_protocol::host::DelegateResponse::NotificationDelivered,
},
}
);
assert_eq!(
(
first_delegate.notifications.load(Ordering::Relaxed),
second_delegate.notifications.load(Ordering::Relaxed)
),
(0, 1)
);
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: (&first_cell_id).into(),
},
},
}))
.await
.expect("first execution-started response");
let _first_started = first_response_rx
.await
.expect("first execute response")
.expect("first started cell");
let first_response = tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("first delegate response timeout")
.expect("first delegate response frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&first_response.into_framed_bytes())
.expect("decode first delegate response"),
ClientToHost::DelegateResponse {
id: first_delegate_id,
result: WireResult::Ok {
value: codex_code_mode_protocol::host::DelegateResponse::NotificationDelivered,
},
}
);
assert_eq!(
(
first_delegate.notifications.load(Ordering::Relaxed),
second_delegate.notifications.load(Ordering::Relaxed)
),
(1, 1)
);
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
assert!(harness.alive.load(Ordering::Relaxed));
}
#[tokio::test]
async fn dropped_open_waiter_shuts_down_committed_session() {
let mut harness = DriverHarness::start();
let session = remote_session();
let (open_tx, open_rx) = oneshot::channel();
let cleanup = SessionCleanup::new();
harness
.command_tx
.send(DriverCommand::OpenSession {
session: session.clone(),
limits: Default::default(),
cleanup,
caller_cancellation: CancellationToken::new(),
response_tx: open_tx,
})
.await
.expect("open command");
drop(open_rx);
harness.outgoing_rx.recv().await.expect("open frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 1),
result: WireResult::Ok {
value: HostResponse::SessionReady {
session_id: session.id.clone(),
},
},
}))
.await
.expect("open response");
harness
.outgoing_rx
.recv()
.await
.expect("abandoned session shutdown frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::SessionClosed {
session_id: session.id.clone(),
},
},
}))
.await
.expect("shutdown response");
let (execute_tx, execute_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Execute {
delegate: Arc::new(RecordingDelegate::default()),
session: session.clone(),
request: ExecuteRequest {
tool_call_id: "call-1".to_string(),
enabled_tools: Vec::new(),
source: "text('ok')".to_string(),
yield_time_ms: None,
max_output_tokens: None,
},
caller_cancellation: CancellationToken::new(),
response_tx: execute_tx,
})
.await
.expect("execute command");
assert_eq!(
execute_rx
.await
.expect("execute reply")
.err()
.expect("closed session should reject execute"),
"unknown code-mode session session-1"
);
}
#[tokio::test]
async fn delegate_cancel_is_best_effort_and_sends_no_late_response() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let request_id = DelegateRequestId::new(/*value*/ 7);
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: request_id,
session_id: session.id.clone(),
request: DelegateRequest::InvokeTool {
invocation: WireNestedToolCall {
cell_id: CellId::new("1".to_string()).into(),
runtime_tool_call_id: "tool-1".to_string(),
tool_name: ToolName::plain("slow").into(),
tool_kind: codex_code_mode_protocol::CodeModeToolKind::Function.into(),
input: None,
},
},
}))
.await
.expect("delegate request");
harness
.event_tx
.send(DriverEvent::HostMessage(
HostToClient::CancelDelegateRequest { id: request_id },
))
.await
.expect("delegate cancel");
tokio::task::yield_now().await;
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: request_id,
session_id: session.id,
request: DelegateRequest::Notify {
call_id: "notify-reused".to_string(),
cell_id: CellId::new("1".to_string()).into(),
text: "duplicate".to_string(),
},
}))
.await
.expect("reused delegate request");
tokio::task::yield_now().await;
assert!(!harness.alive.load(Ordering::Acquire));
assert_eq!(delegate.invocations.load(Ordering::Relaxed), 1);
assert_eq!(delegate.notifications.load(Ordering::Relaxed), 0);
}
#[tokio::test]
async fn delegate_limit_returns_an_error_without_disconnecting() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
for value in 1..=MAX_PENDING_DELEGATE_CALLS {
harness
.start_tool_delegate(&session, DelegateRequestId::new(value as i64))
.await;
}
let overflow_id = DelegateRequestId::new(MAX_PENDING_DELEGATE_CALLS as i64 + 1);
harness.start_tool_delegate(&session, overflow_id).await;
let response = tokio::time::timeout(Duration::from_secs(5), harness.outgoing_rx.recv())
.await
.expect("delegate overflow response timeout")
.expect("delegate overflow response frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&response.into_framed_bytes())
.expect("decode delegate overflow response"),
ClientToHost::DelegateResponse {
id: overflow_id,
result: WireResult::Err {
message: format!(
"code-mode host exceeded the limit of {MAX_PENDING_DELEGATE_CALLS} pending delegate calls"
),
},
}
);
assert!(harness.alive.load(Ordering::Acquire));
harness
.event_tx
.send(DriverEvent::HostMessage(
HostToClient::CancelDelegateRequest {
id: DelegateRequestId::new(/*value*/ 1),
},
))
.await
.expect("cancel pending delegate");
harness
.start_tool_delegate(
&session,
DelegateRequestId::new(MAX_PENDING_DELEGATE_CALLS as i64 + 2),
)
.await;
tokio::time::timeout(Duration::from_secs(5), async {
while delegate.invocations.load(Ordering::Relaxed) <= MAX_PENDING_DELEGATE_CALLS {
tokio::task::yield_now().await;
}
})
.await
.expect("delegate capacity should be available after cancellation");
assert_eq!(
delegate.invocations.load(Ordering::Relaxed),
MAX_PENDING_DELEGATE_CALLS + 1
);
assert!(harness.alive.load(Ordering::Acquire));
}
#[tokio::test]
async fn terminate_closes_cell_without_waiting_for_delegate_cleanup() {
let mut harness = DriverHarness::start();
let session = remote_session();
let (delegate, mut events_rx, release) = HeldDelegate::new();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let delegate_id = DelegateRequestId::new(/*value*/ 7);
harness.start_tool_delegate(&session, delegate_id).await;
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Started
);
let (response_tx, response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Terminate {
session: session.clone(),
cell_id: CellId::new("1".to_string()),
response_tx,
})
.await
.expect("terminate command");
harness.outgoing_rx.recv().await.expect("terminate frame");
harness
.event_tx
.send(DriverEvent::HostMessage(
HostToClient::CancelDelegateRequest { id: delegate_id },
))
.await
.expect("delegate cancel");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id,
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("terminate response");
let closure_events = [
next_held_delegate_event(&mut events_rx).await,
next_held_delegate_event(&mut events_rx).await,
];
assert!(closure_events.contains(&HeldDelegateEvent::Cancelled));
assert!(closure_events.contains(&HeldDelegateEvent::CellClosed(CellId::new("1".to_string()))));
assert_eq!(
response_rx.await.expect("terminate reply"),
Ok(codex_code_mode_protocol::WaitOutcome::LiveCell(
codex_code_mode_protocol::RuntimeResponse::Terminated {
code_mode_host_duration: Some(Duration::ZERO),
cell_id: CellId::new("1".to_string()),
content_items: Vec::new(),
}
))
);
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty | mpsc::error::TryRecvError::Disconnected)
));
release.cancel();
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Finished
);
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty | mpsc::error::TryRecvError::Disconnected)
));
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
assert!(harness.alive.load(Ordering::Acquire));
}
#[tokio::test]
async fn shutdown_closes_cell_without_waiting_for_delegate_cleanup() {
let mut harness = DriverHarness::start();
let session = remote_session();
let (delegate, mut events_rx, release) = HeldDelegate::new();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let delegate_id = DelegateRequestId::new(/*value*/ 7);
harness.start_tool_delegate(&session, delegate_id).await;
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Started
);
let (response_tx, response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::ShutdownSession {
session: session.clone(),
response_tx,
})
.await
.expect("shutdown command");
harness.outgoing_rx.recv().await.expect("shutdown frame");
harness
.event_tx
.send(DriverEvent::HostMessage(
HostToClient::CancelDelegateRequest { id: delegate_id },
))
.await
.expect("delegate cancel");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id.clone(),
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::SessionClosed {
session_id: session.id,
},
},
}))
.await
.expect("shutdown response");
let closure_events = [
next_held_delegate_event(&mut events_rx).await,
next_held_delegate_event(&mut events_rx).await,
];
assert!(closure_events.contains(&HeldDelegateEvent::Cancelled));
assert!(closure_events.contains(&HeldDelegateEvent::CellClosed(CellId::new("1".to_string()))));
assert_eq!(response_rx.await.expect("shutdown reply"), Ok(()));
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
release.cancel();
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Finished
);
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty | mpsc::error::TryRecvError::Disconnected)
));
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
assert!(harness.alive.load(Ordering::Acquire));
}
#[tokio::test]
async fn completed_delegate_request_id_cannot_be_reused() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let request_id = DelegateRequestId::new(/*value*/ 7);
let request = || DelegateRequest::Notify {
call_id: "notify-1".to_string(),
cell_id: CellId::new("1".to_string()).into(),
text: "once".to_string(),
};
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: request_id,
session_id: session.id.clone(),
request: request(),
}))
.await
.expect("delegate request");
harness
.outgoing_rx
.recv()
.await
.expect("delegate response frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: request_id,
session_id: session.id,
request: request(),
}))
.await
.expect("reused delegate request");
tokio::task::yield_now().await;
assert!(!harness.alive.load(Ordering::Acquire));
assert_eq!(delegate.notifications.load(Ordering::Relaxed), 1);
}
#[tokio::test]
async fn delegate_task_panic_becomes_tool_error_without_killing_connection() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
Arc::new(PanickingDelegate),
)
.await;
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id: DelegateRequestId::new(/*value*/ 7),
session_id: session.id.clone(),
request: DelegateRequest::InvokeTool {
invocation: WireNestedToolCall {
cell_id: CellId::new("1".to_string()).into(),
runtime_tool_call_id: "tool-1".to_string(),
tool_name: ToolName::plain("panic").into(),
tool_kind: codex_code_mode_protocol::CodeModeToolKind::Function.into(),
input: None,
},
},
}))
.await
.expect("delegate request");
tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("delegate response timeout")
.expect("delegate response frame");
assert!(harness.alive.load(Ordering::Acquire));
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id,
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
}
#[tokio::test]
async fn delegate_for_unknown_cell_returns_error_without_invocation() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"known",
delegate.clone(),
)
.await;
let id = DelegateRequestId::new(/*value*/ 7);
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id,
session_id: session.id,
request: DelegateRequest::InvokeTool {
invocation: WireNestedToolCall {
cell_id: CellId::new("missing".to_string()).into(),
runtime_tool_call_id: "tool-1".to_string(),
tool_name: ToolName::plain("slow").into(),
tool_kind: codex_code_mode_protocol::CodeModeToolKind::Function.into(),
input: None,
},
},
}))
.await
.expect("delegate request");
let response = tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("delegate response timeout")
.expect("delegate response frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&response.into_framed_bytes())
.expect("decode delegate response"),
ClientToHost::DelegateResponse {
id,
result: WireResult::Err {
message: "code-mode host delegated for unknown cell missing in session session-1"
.to_string(),
},
}
);
assert!(harness.alive.load(Ordering::Acquire));
assert_eq!(delegate.invocations.load(Ordering::Relaxed), 0);
}
#[tokio::test]
async fn delegate_after_cell_close_returns_error_without_invocation() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id.clone(),
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
let id = DelegateRequestId::new(/*value*/ 7);
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::DelegateRequest {
id,
session_id: session.id,
request: DelegateRequest::Notify {
call_id: "notify-1".to_string(),
cell_id: CellId::new("1".to_string()).into(),
text: "late".to_string(),
},
}))
.await
.expect("delegate request");
let response = tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("delegate response timeout")
.expect("delegate response frame");
assert_eq!(
EncodedFrame::decode_framed::<ClientToHost>(&response.into_framed_bytes())
.expect("decode delegate response"),
ClientToHost::DelegateResponse {
id,
result: WireResult::Err {
message: "code-mode host delegated for unknown cell 1 in session session-1"
.to_string(),
},
}
);
assert!(harness.alive.load(Ordering::Acquire));
assert_eq!(delegate.notifications.load(Ordering::Relaxed), 0);
}
#[tokio::test]
async fn mismatched_initial_response_fails_connection_and_closes_cell_once() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let started = harness
.start_cell(session, /*request_id*/ 2, "1", delegate.clone())
.await;
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::InitialResponse {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: WireRuntimeResponse::Yielded {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("2".to_string()).into(),
content_items: Vec::new(),
},
},
}))
.await
.expect("initial response");
assert!(started.initial_response().await.is_err());
assert!(!harness.alive.load(Ordering::Acquire));
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn mismatched_wait_response_fails_connection() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let (response_tx, response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Wait {
session,
request: WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 1,
},
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("wait command");
harness.outgoing_rx.recv().await.expect("wait frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Yielded {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("2".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("wait response");
assert!(response_rx.await.expect("wait reply").is_err());
assert!(!harness.alive.load(Ordering::Acquire));
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn mismatched_terminate_response_fails_connection() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let (response_tx, response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Terminate {
session,
cell_id: CellId::new("1".to_string()),
response_tx,
})
.await
.expect("terminate command");
harness.outgoing_rx.recv().await.expect("terminate frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::MissingCell(WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("2".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("terminate response");
assert!(response_rx.await.expect("terminate reply").is_err());
assert!(!harness.alive.load(Ordering::Acquire));
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn remote_wait_accepts_durations_longer_than_five_minutes() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
Arc::new(RecordingDelegate::default()),
)
.await;
let (response_tx, response_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Wait {
session,
request: WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 300_001,
},
caller_cancellation: CancellationToken::new(),
response_tx,
})
.await
.expect("wait command");
tokio::time::timeout(Duration::from_secs(1), harness.outgoing_rx.recv())
.await
.expect("wait frame timeout")
.expect("wait frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Yielded {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("wait response");
assert_eq!(
response_rx.await.expect("wait reply"),
Ok(codex_code_mode_protocol::WaitOutcome::LiveCell(
codex_code_mode_protocol::RuntimeResponse::Yielded {
code_mode_host_duration: Some(Duration::ZERO),
cell_id: CellId::new("1".to_string()),
content_items: Vec::new(),
}
))
);
}
/// A stalled remote wait must expire even when its request never reaches the host.
#[tokio::test(start_paused = true)]
async fn queued_remote_wait_times_out_and_invalidates_the_connection() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
Arc::new(RecordingDelegate::default()),
)
.await;
let connection = Connection {
command_tx: harness.command_tx.clone(),
execute_claim_tx: harness.execute_claim_tx.clone(),
alive: Arc::clone(&harness.alive),
failure: Arc::clone(&harness.failure),
cancellation: harness.cancellation.clone(),
capabilities: CapabilitySet::empty(),
};
let response = tokio::spawn(async move {
let result = connection
.wait(
session,
WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 1,
},
)
.await;
(connection, result)
});
while harness.outgoing_rx.is_empty() {
tokio::task::yield_now().await;
}
tokio::time::advance(DEFAULT_HOST_WAIT_TRANSPORT_TIMEOUT + Duration::from_secs(2)).await;
let (connection, result) = response.await.expect("wait task");
assert_eq!(
result,
Err("code-mode host timed out waiting for wait response".to_string())
);
assert!(!harness.alive.load(Ordering::Acquire));
assert!(harness.cancellation.is_cancelled());
drop(connection);
}
/// A stalled termination must expire and invalidate the same connection as a stalled wait.
#[tokio::test(start_paused = true)]
async fn queued_remote_termination_times_out_and_invalidates_the_connection() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
Arc::new(RecordingDelegate::default()),
)
.await;
let connection = Connection {
command_tx: harness.command_tx.clone(),
execute_claim_tx: harness.execute_claim_tx.clone(),
alive: Arc::clone(&harness.alive),
failure: Arc::clone(&harness.failure),
cancellation: harness.cancellation.clone(),
capabilities: CapabilitySet::empty(),
};
let response = tokio::spawn(async move {
let result = connection
.terminate(session, CellId::new("1".to_string()))
.await;
(connection, result)
});
while harness.outgoing_rx.is_empty() {
tokio::task::yield_now().await;
}
tokio::time::advance(DEFAULT_HOST_WAIT_TRANSPORT_TIMEOUT + Duration::from_secs(1)).await;
let (connection, result) = response.await.expect("termination task");
assert_eq!(
result,
Err("code-mode host timed out waiting for terminate response".to_string())
);
assert!(!harness.alive.load(Ordering::Acquire));
assert!(harness.cancellation.is_cancelled());
drop(connection);
}
#[tokio::test]
async fn cancelled_wait_is_retired_before_next_wait_is_sent() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
Arc::new(RecordingDelegate::default()),
)
.await;
let first_cancellation = CancellationToken::new();
let (first_tx, first_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Wait {
session: session.clone(),
request: WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 60_000,
},
caller_cancellation: first_cancellation.clone(),
response_tx: first_tx,
})
.await
.expect("first wait command");
harness.outgoing_rx.recv().await.expect("first wait frame");
first_cancellation.cancel();
drop(first_rx);
let (second_tx, second_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Wait {
session,
request: WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 1,
},
caller_cancellation: CancellationToken::new(),
response_tx: second_tx,
})
.await
.expect("second wait command");
harness
.outgoing_rx
.recv()
.await
.expect("cancel request frame");
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Err {
message: "code-mode request cancelled".to_string(),
},
}))
.await
.expect("cancelled wait response");
harness.outgoing_rx.recv().await.expect("second wait frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 4),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Yielded {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("second wait response");
assert_eq!(
second_rx.await.expect("second wait reply"),
Ok(codex_code_mode_protocol::WaitOutcome::LiveCell(
codex_code_mode_protocol::RuntimeResponse::Yielded {
code_mode_host_duration: Some(Duration::ZERO),
cell_id: CellId::new("1".to_string()),
content_items: Vec::new(),
}
))
);
}
#[tokio::test]
async fn abandoned_execute_is_tracked_and_terminated_after_admission() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let cancellation = CancellationToken::new();
let (execute_tx, execute_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Execute {
delegate: delegate.clone(),
session: session.clone(),
request: ExecuteRequest {
tool_call_id: "call-1".to_string(),
enabled_tools: Vec::new(),
source: "await new Promise(() => {})".to_string(),
yield_time_ms: Some(1),
max_output_tokens: None,
},
caller_cancellation: cancellation.clone(),
response_tx: execute_tx,
})
.await
.expect("execute command");
harness.outgoing_rx.recv().await.expect("execute frame");
cancellation.cancel();
drop(execute_rx);
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: CellId::new("1".to_string()).into(),
},
},
}))
.await
.expect("execute response");
harness
.outgoing_rx
.recv()
.await
.expect("execute cancellation frame");
harness
.outgoing_rx
.recv()
.await
.expect("abandoned cell termination frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::InitialResponse {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
},
},
}))
.await
.expect("initial response");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("terminate response");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id,
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
tokio::task::yield_now().await;
assert!(harness.alive.load(Ordering::Acquire));
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn delivered_but_unclaimed_execute_is_terminated_when_the_caller_is_cancelled() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let cancellation = CancellationToken::new();
let (execute_tx, execute_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Execute {
delegate: delegate.clone(),
session: session.clone(),
request: ExecuteRequest {
tool_call_id: "call-1".to_string(),
enabled_tools: Vec::new(),
source: "await new Promise(() => {})".to_string(),
yield_time_ms: Some(1),
max_output_tokens: None,
},
caller_cancellation: cancellation.clone(),
response_tx: execute_tx,
})
.await
.expect("execute command");
harness.outgoing_rx.recv().await.expect("execute frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: CellId::new("1".to_string()).into(),
},
},
}))
.await
.expect("execute response");
let delivered = execute_rx
.await
.expect("execute reply")
.expect("delivered execute");
assert_eq!(delivered.request_id, RequestId::new(/*value*/ 2));
cancellation.cancel();
harness
.outgoing_rx
.recv()
.await
.expect("execute cancellation frame");
harness
.outgoing_rx
.recv()
.await
.expect("unclaimed cell termination frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::InitialResponse {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
},
},
}))
.await
.expect("initial response");
assert!(delivered.started.initial_response().await.is_ok());
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 3),
result: WireResult::Ok {
value: HostResponse::WaitCompleted {
outcome: WireWaitOutcome::LiveCell(WireRuntimeResponse::Terminated {
code_mode_host_duration_ns: 0,
cell_id: CellId::new("1".to_string()).into(),
content_items: Vec::new(),
}),
},
},
}))
.await
.expect("terminate response");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id,
cell_id: CellId::new("1".to_string()).into(),
}))
.await
.expect("cell close");
tokio::time::timeout(Duration::from_secs(2), async {
while Arc::strong_count(&delegate) > 1 {
tokio::task::yield_now().await;
}
})
.await
.expect("abandoned execution should release its delegate");
assert!(harness.alive.load(Ordering::Acquire));
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn session_accepts_more_than_4096_cells_without_growing_a_tombstone_set() {
const CELL_COUNT: usize = 4097;
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
for sequence in 1..=CELL_COUNT {
let request_id = i64::try_from(sequence).expect("cell sequence fits in i64") + 1;
let cell_id = sequence.to_string();
let started = harness
.start_cell(session.clone(), request_id, &cell_id, delegate.clone())
.await;
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::InitialResponse {
id: RequestId::new(request_id),
result: WireResult::Ok {
value: WireRuntimeResponse::Yielded {
code_mode_host_duration_ns: 0,
cell_id: CellId::new(cell_id.clone()).into(),
content_items: Vec::new(),
},
},
}))
.await
.expect("initial response");
assert!(started.initial_response().await.is_ok());
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::CellClosed {
session_id: session.id.clone(),
cell_id: CellId::new(cell_id).into(),
}))
.await
.expect("cell close");
}
tokio::time::timeout(Duration::from_secs(1), async {
while delegate
.closed_cells
.lock()
.expect("closed cells lock")
.len()
!= CELL_COUNT
{
tokio::task::yield_now().await;
}
})
.await
.expect("cell close callbacks timeout");
assert!(harness.alive.load(Ordering::Acquire));
}
#[tokio::test]
async fn connection_failure_closes_every_live_cell_once() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
let cleanup = harness.open(session.clone()).await;
let (execute_tx, execute_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Execute {
delegate: delegate.clone(),
session,
request: ExecuteRequest {
tool_call_id: "call-1".to_string(),
enabled_tools: Vec::new(),
source: "await new Promise(() => {})".to_string(),
yield_time_ms: Some(1),
max_output_tokens: None,
},
caller_cancellation: CancellationToken::new(),
response_tx: execute_tx,
})
.await
.expect("execute command");
harness.outgoing_rx.recv().await.expect("execute frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::ExecutionStarted {
cell_id: CellId::new("1".to_string()).into(),
},
},
}))
.await
.expect("execute response");
let _started = execute_rx
.await
.expect("execute reply")
.expect("execute session");
harness
.event_tx
.send(DriverEvent::Failed("host crashed".to_string()))
.await
.expect("failure event");
tokio::time::timeout(Duration::from_secs(1), cleanup.wait())
.await
.expect("session cleanup timeout");
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn session_cleanup_does_not_wait_for_delegate_completion() {
let mut harness = DriverHarness::start();
let session = remote_session();
let (delegate, mut events_rx, release) = HeldDelegate::new();
let cleanup = harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
harness
.start_tool_delegate(&session, DelegateRequestId::new(/*value*/ 7))
.await;
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Started
);
harness
.event_tx
.send(DriverEvent::Failed("host crashed".to_string()))
.await
.expect("failure event");
let closure_events = [
next_held_delegate_event(&mut events_rx).await,
next_held_delegate_event(&mut events_rx).await,
];
assert!(closure_events.contains(&HeldDelegateEvent::Cancelled));
assert!(closure_events.contains(&HeldDelegateEvent::CellClosed(CellId::new("1".to_string()))));
tokio::time::timeout(Duration::from_secs(1), cleanup.wait())
.await
.expect("session cleanup timeout");
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
release.cancel();
assert_eq!(
next_held_delegate_event(&mut events_rx).await,
HeldDelegateEvent::Finished
);
assert!(matches!(
events_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty | mpsc::error::TryRecvError::Disconnected)
));
}
#[tokio::test]
async fn aborting_driver_marks_connection_dead_and_closes_cells() {
let mut harness = DriverHarness::start();
let session = remote_session();
let delegate = Arc::new(RecordingDelegate::default());
harness.open(session.clone()).await;
let _started = harness
.start_cell(
session.clone(),
/*request_id*/ 2,
"1",
delegate.clone(),
)
.await;
let (wait_tx, wait_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Wait {
session,
request: WaitRequest {
cell_id: CellId::new("1".to_string()),
yield_time_ms: 60_000,
},
caller_cancellation: CancellationToken::new(),
response_tx: wait_tx,
})
.await
.expect("wait command");
harness.outgoing_rx.recv().await.expect("wait frame");
harness.driver_task.abort();
for _ in 0..10 {
if !harness.alive.load(Ordering::Acquire) {
break;
}
tokio::task::yield_now().await;
}
assert!(!harness.alive.load(Ordering::Acquire));
assert!(harness.cancellation.is_cancelled());
assert!(wait_rx.await.expect("wait failure").is_err());
assert_eq!(
*delegate.closed_cells.lock().expect("closed cells lock"),
vec![CellId::new("1".to_string())]
);
}
#[tokio::test]
async fn dropped_shutdown_waiter_does_not_abort_remote_cleanup() {
let mut harness = DriverHarness::start();
let session = remote_session();
harness.open(session.clone()).await;
let (shutdown_tx, shutdown_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::ShutdownSession {
session: session.clone(),
response_tx: shutdown_tx,
})
.await
.expect("shutdown command");
drop(shutdown_rx);
harness.outgoing_rx.recv().await.expect("shutdown frame");
harness
.event_tx
.send(DriverEvent::HostMessage(HostToClient::Response {
id: RequestId::new(/*value*/ 2),
result: WireResult::Ok {
value: HostResponse::SessionClosed {
session_id: session.id.clone(),
},
},
}))
.await
.expect("shutdown response");
let (execute_tx, execute_rx) = oneshot::channel();
harness
.command_tx
.send(DriverCommand::Execute {
delegate: Arc::new(RecordingDelegate::default()),
session,
request: ExecuteRequest {
tool_call_id: "call-2".to_string(),
enabled_tools: Vec::new(),
source: "text('unreachable')".to_string(),
yield_time_ms: None,
max_output_tokens: None,
},
caller_cancellation: CancellationToken::new(),
response_tx: execute_tx,
})
.await
.expect("execute command");
assert_eq!(
execute_rx
.await
.expect("execute reply")
.err()
.expect("closed session should reject execute"),
"unknown code-mode session session-1"
);
assert!(matches!(
harness.outgoing_rx.try_recv(),
Err(mpsc::error::TryRecvError::Empty)
));
}
|