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use codex_code_mode_protocol::host::ClientToHost;
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::RequestId;
use codex_code_mode_protocol::host::WireCellId;
use tokio::sync::oneshot;
use super::ConnectionDriver;
use super::cell_ids::public_runtime_response;
use super::cell_ids::public_wait_outcome;
use super::cell_ids::runtime_response_cell_id;
use super::cell_ids::wait_outcome_cell_id;
use super::request_tracker::CancellationAction;
use super::session_registry::CellAdmissionError;
use super::types::DeliveredExecute;
use super::types::InitialResponse;
use super::types::PendingRequest;
use super::types::RemoteSession;
use super::types::UnclaimedExecute;
impl ConnectionDriver {
pub(super) fn flush_deferred_waits(&mut self) -> bool {
let mut deferred = self.requests.take_deferred_waits();
while let Some(wait) = deferred.pop_front() {
if wait.caller_cancellation.is_cancelled() {
let _ = wait
.response_tx
.send(Err("code-mode request cancelled".to_string()));
continue;
}
if self
.requests
.has_cancelled_wait(&wait.session, &wait.request.cell_id)
{
self.requests.push_deferred_wait(wait);
continue;
}
if !self.start_wait(
wait.session,
wait.request,
wait.caller_cancellation,
wait.response_tx,
) {
for wait in deferred {
let _ = wait
.response_tx
.send(Err("code-mode host connection closed".to_string()));
}
return false;
}
}
true
}
pub(super) fn handle_host_message(&mut self, message: HostToClient) -> bool {
if self.should_defer_host_message(&message) {
if self.deferred_host_messages.len()
>= codex_code_mode_protocol::host::MAX_PENDING_DELEGATE_CALLS
{
self.fail(
"code-mode host exceeded deferred cross-socket message limit".to_string(),
);
return false;
}
self.deferred_host_messages.push_back(message);
return true;
}
if !self.dispatch_host_message(message) {
return false;
}
for _ in 0..self.deferred_host_messages.len() {
let Some(message) = self.deferred_host_messages.pop_front() else {
break;
};
if self.should_defer_host_message(&message) {
self.deferred_host_messages.push_back(message);
} else if !self.dispatch_host_message(message) {
return false;
}
}
true
}
fn should_defer_host_message(&self, message: &HostToClient) -> bool {
match message {
HostToClient::DelegateRequest {
session_id,
request,
..
} => {
let cell_id = match request {
codex_code_mode_protocol::host::DelegateRequest::InvokeTool { invocation } => {
&invocation.cell_id
}
codex_code_mode_protocol::host::DelegateRequest::Notify { cell_id, .. } => {
cell_id
}
};
!self.sessions.contains_cell(session_id, cell_id)
&& self.requests.has_pending_execute_for_session(session_id)
}
HostToClient::Response { .. }
| HostToClient::InitialResponse { .. }
| HostToClient::CellClosed { .. }
| HostToClient::CancelDelegateRequest { .. }
| HostToClient::HostHello(_)
| HostToClient::HandshakeRejected { .. } => false,
}
}
fn dispatch_host_message(&mut self, message: HostToClient) -> bool {
match message {
HostToClient::Response { id, result } => {
self.complete_request(id, result.into_result())
}
HostToClient::InitialResponse { id, result } => {
self.complete_initial_response(id, result.into_result())
}
HostToClient::DelegateRequest {
id,
session_id,
request,
} => self.start_delegate(id, session_id, request),
HostToClient::CancelDelegateRequest { id } => {
self.deferred_host_messages.retain(|message| {
!matches!(
message,
HostToClient::DelegateRequest { id: deferred_id, .. } if *deferred_id == id
)
});
self.delegates.cancel(id);
true
}
HostToClient::CellClosed {
session_id,
cell_id,
} => self.close_cell(session_id, cell_id),
HostToClient::HostHello(_) | HostToClient::HandshakeRejected { .. } => {
self.fail("code-mode host sent a second handshake response".to_string());
false
}
}
}
fn complete_request(&mut self, id: RequestId, result: Result<HostResponse, String>) -> bool {
let Some(pending) = self.requests.remove_pending(id) else {
self.fail(format!("code-mode host returned unknown request ID {id:?}"));
return false;
};
match pending {
PendingRequest::OpenSession {
session,
cleanup,
cancellation,
response_tx,
} => match result {
Ok(HostResponse::SessionReady { session_id }) if session_id == session.id => {
let abandoned = cancellation.is_cancelled() || response_tx.is_closed();
self.sessions.insert_ready(session.clone(), cleanup);
if abandoned || response_tx.send(Ok(())).is_err() {
return self.shutdown_abandoned_session(session);
}
}
Ok(_) => {
let reason =
"code-mode host returned an invalid open-session response".to_string();
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Err(err) => {
let _ = response_tx.send(Err(err));
}
},
PendingRequest::Execute {
session,
delegate,
response_tx,
initial_response_tx,
initial_response_rx,
cancellation,
} => match result {
Ok(HostResponse::ExecutionStarted { cell_id }) => {
// The host owns a checked, never-reused ID sequence. Retain only live
// IDs so client memory scales with concurrency, not session lifetime.
let remote_cell_id = cell_id.clone();
let public_id = match self.sessions.admit_cell(&session, cell_id, delegate) {
Ok(public_id) => public_id,
Err(CellAdmissionError::MissingSession) => {
let _ = response_tx
.send(Err("code-mode session closed during execute".to_string()));
return true;
}
Err(CellAdmissionError::DuplicateCell) => {
let reason = format!(
"code-mode host reused live cell {} in session {}",
remote_cell_id.as_str(),
session.id
);
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
};
self.requests.insert_initial_response(
id,
InitialResponse {
generation: session.generation,
cell_id: remote_cell_id.clone(),
response_tx: initial_response_tx,
},
);
let started = StartedCell::from_result_receiver(public_id, initial_response_rx);
if cancellation.is_cancelled() || response_tx.is_closed() {
return self.terminate_abandoned_cell(session, remote_cell_id);
}
let delivered = DeliveredExecute {
request_id: id,
started,
};
if response_tx.send(Ok(delivered)).is_err() {
return self.terminate_abandoned_cell(session, remote_cell_id);
}
self.requests.insert_unclaimed_execute(
id,
UnclaimedExecute {
session,
cell_id: remote_cell_id,
cancellation,
},
);
}
Ok(_) => {
let reason = "code-mode host returned an invalid execute response".to_string();
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Err(err) => {
let _ = response_tx.send(Err(err));
}
},
PendingRequest::Wait {
session,
cell_id,
cancellation: _,
response_tx,
} => {
let result = match result {
Ok(HostResponse::WaitCompleted { outcome }) => {
if wait_outcome_cell_id(&outcome) != &cell_id {
let reason = format!(
"code-mode host returned cell {} for request targeting {}",
wait_outcome_cell_id(&outcome).as_str(),
cell_id.as_str()
);
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Ok(public_wait_outcome(session.generation, outcome.into()))
}
Ok(_) => {
let reason = "code-mode host returned an invalid cell response".to_string();
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Err(err) => Err(err),
};
let _ = response_tx.send(result);
}
PendingRequest::Terminate {
session,
cell_id,
response_tx,
} => {
let result = match result {
Ok(HostResponse::WaitCompleted { outcome }) => {
if wait_outcome_cell_id(&outcome) != &cell_id {
let reason = format!(
"code-mode host returned cell {} for request targeting {}",
wait_outcome_cell_id(&outcome).as_str(),
cell_id.as_str()
);
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
public_wait_outcome(session.generation, outcome.into())
}
Ok(_) => {
let reason = "code-mode host returned an invalid cell response".to_string();
let _ = response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Err(err) => {
let _ = response_tx.send(Err(err));
return true;
}
};
let _ = response_tx.send(Ok(result));
}
PendingRequest::ShutdownSession {
session,
response_tx,
} => match result {
Ok(HostResponse::SessionClosed { session_id }) if session_id == session.id => {
let effects = self.close_session_locally(&session.id);
if !self.apply_delegate_effects(effects) {
return false;
}
let _ = response_tx.send(Ok(()));
}
Ok(_) => {
let err = "code-mode host returned an invalid shutdown response".to_string();
let _ = response_tx.send(Err(err.clone()));
self.fail(err);
return false;
}
Err(err) => {
let _ = response_tx.send(Err(err.clone()));
self.fail(err);
return false;
}
},
}
true
}
pub(super) fn cancel_dropped_callers(&mut self) -> bool {
for action in self.requests.collect_cancellations() {
if !self.apply_cancellation(action) {
return false;
}
}
true
}
pub(super) fn cancel_request(&mut self, id: RequestId) -> bool {
self.requests
.mark_cancelled(id)
.is_none_or(|action| self.apply_cancellation(action))
}
fn apply_cancellation(&mut self, action: CancellationAction) -> bool {
match action {
CancellationAction::Send(id) => self.send_cancel_request(id),
CancellationAction::Terminate {
request_id,
execute,
} => {
if !self.send_cancel_request(request_id) {
return false;
}
self.terminate_abandoned_cell(execute.session, execute.cell_id)
}
}
}
fn send_cancel_request(&mut self, id: RequestId) -> bool {
let message = ClientToHost::CancelRequest { id };
let frame = match EncodedFrame::encode(&message) {
Ok(frame) => frame,
Err(err) => {
self.fail(format!(
"failed to encode code-mode cancellation request: {err}"
));
return false;
}
};
self.queue_frame(frame)
}
fn shutdown_abandoned_session(&mut self, session: RemoteSession) -> bool {
let Some(should_shutdown) = self.sessions.begin_abandoned_shutdown(&session.id) else {
self.fail(format!(
"code-mode host committed abandoned session {} without local state",
session.id
));
return false;
};
if !should_shutdown {
return true;
}
let (response_tx, response_rx) = oneshot::channel();
drop(response_rx);
self.send_request(
HostRequest::ShutdownSession {
session_id: session.id.clone(),
},
PendingRequest::ShutdownSession {
session,
response_tx,
},
)
}
fn terminate_abandoned_cell(&mut self, session: RemoteSession, cell_id: WireCellId) -> bool {
let Some(is_closing) = self.sessions.is_closing(&session.id) else {
self.fail(format!(
"code-mode host admitted an abandoned cell in unknown session {}",
session.id
));
return false;
};
if is_closing {
return true;
}
let (response_tx, response_rx) = oneshot::channel();
drop(response_rx);
self.send_request(
HostRequest::Terminate {
session_id: session.id.clone(),
cell_id: cell_id.clone(),
},
PendingRequest::Terminate {
session,
cell_id,
response_tx,
},
)
}
fn complete_initial_response(
&mut self,
id: RequestId,
result: Result<codex_code_mode_protocol::host::WireRuntimeResponse, String>,
) -> bool {
let Some(initial) = self.requests.remove_initial_response(id) else {
self.fail(format!(
"code-mode host returned initial response for unknown request ID {id:?}"
));
return false;
};
let response = match result {
Ok(response) if runtime_response_cell_id(&response) == &initial.cell_id => {
Ok(public_runtime_response(initial.generation, response.into()))
}
Ok(response) => {
let reason = format!(
"code-mode host returned initial response for cell {} instead of {}",
runtime_response_cell_id(&response).as_str(),
initial.cell_id.as_str()
);
let _ = initial.response_tx.send(Err(reason.clone()));
self.fail(reason);
return false;
}
Err(err) => Err(err),
};
let _ = initial.response_tx.send(response);
true
}
}
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