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mod conversions;
mod types;
use std::collections::HashMap;
use std::future::Future;
use std::sync::Arc;
use serde_json::Value as JsonValue;
use tokio::sync::mpsc;
use tokio::sync::oneshot;
use tokio::task::JoinSet;
use tokio_util::sync::CancellationToken;
use self::callbacks::CallbackCompletion;
use self::callbacks::finish_callbacks;
use self::callbacks::report_task_result;
use self::callbacks::spawn_notification;
use self::callbacks::spawn_tool;
use self::conversions::cell_tool_kind;
use self::conversions::output_item;
use self::conversions::runtime_request;
use self::types::CellCommand;
pub(crate) use self::types::CellError;
pub(crate) use self::types::CellEventFuture;
pub(crate) use self::types::CellHandle;
pub(crate) use self::types::CellHost;
pub(crate) use self::types::CellState;
pub(crate) use self::types::CellToolCall;
pub(crate) use self::types::CompletionCommit;
use self::types::CompletionDelivery;
use self::types::ObservationDelivery;
use crate::TaskFailureHandler;
use crate::runtime::PendingRuntimeMode;
use crate::runtime::RuntimeCommand;
use crate::runtime::RuntimeControlCommand;
use crate::runtime::RuntimeEvent;
use crate::runtime::spawn_runtime;
use crate::session_runtime::CellEvent;
use crate::session_runtime::CreateCellRequest as CellRequest;
use crate::session_runtime::ObserveMode;
use crate::session_runtime::OutputItem;
use crate::session_runtime::ToolName as CellToolName;
pub(crate) struct CellActor;
impl CellActor {
pub(crate) fn prepare<H: CellHost>(
request: CellRequest,
stored_values: HashMap<String, JsonValue>,
host: Arc<H>,
initial_observe_mode: ObserveMode,
cell_state: Arc<CellState>,
task_failure_handler: Option<TaskFailureHandler>,
) -> Result<
(
CellHandle,
CellEventFuture,
impl Future<Output = ()> + Send + 'static,
),
String,
> {
let (event_tx, event_rx) = mpsc::unbounded_channel();
let (command_tx, command_rx) = mpsc::unbounded_channel();
let (initial_response_tx, initial_response_rx) = oneshot::channel();
let (runtime_tx, runtime_control_tx, runtime_terminate_handle) = spawn_runtime(
stored_values,
runtime_request(request),
event_tx,
PendingRuntimeMode::PauseUntilResumed,
task_failure_handler.clone(),
)?;
let handle = CellHandle::new(command_tx, Arc::clone(&cell_state));
let task = run_cell(
host,
CellContext {
runtime_tx,
runtime_control_tx,
runtime_terminate_handle,
cell_state,
},
event_rx,
command_rx,
Observer {
mode: initial_observe_mode,
response_tx: initial_response_tx,
},
task_failure_handler,
);
let initial_response =
Box::pin(async move { initial_response_rx.await.unwrap_or(Err(CellError::Closed)) });
Ok((handle, initial_response, task))
}
}
struct CellContext {
runtime_tx: std::sync::mpsc::Sender<RuntimeCommand>,
runtime_control_tx: std::sync::mpsc::Sender<RuntimeControlCommand>,
runtime_terminate_handle: v8::IsolateHandle,
cell_state: Arc<CellState>,
}
struct Observer {
mode: ObserveMode,
response_tx: oneshot::Sender<Result<CellEvent, CellError>>,
}
async fn run_cell<H: CellHost>(
host: Arc<H>,
context: CellContext,
mut event_rx: mpsc::UnboundedReceiver<RuntimeEvent>,
command_rx: mpsc::UnboundedReceiver<CellCommand>,
initial_observer: Observer,
task_failure_handler: Option<TaskFailureHandler>,
) {
let CellContext {
runtime_tx,
runtime_control_tx,
runtime_terminate_handle,
cell_state,
} = context;
let cancellation_token = cell_state.cancellation_token();
let callback_cancellation_token = cancellation_token.child_token();
let mut content_items = Vec::new();
let mut pending_tool_call_ids = Vec::new();
let mut pending_frontier_ready = false;
let mut observer = Some(initial_observer);
let mut termination = false;
let mut runtime_closed = false;
let mut runtime_paused = false;
let mut runtime_failure_reported = false;
let mut yield_timer: Option<std::pin::Pin<Box<tokio::time::Sleep>>> = None;
let mut notification_tasks = JoinSet::new();
let mut tool_tasks = JoinSet::new();
let mut command_rx = Some(command_rx);
loop {
let yield_deadline_elapsed = yield_timer
.as_ref()
.is_some_and(|yield_timer| yield_timer.deadline() <= tokio::time::Instant::now());
tokio::select! {
biased;
_ = cancellation_token.cancelled(), if !termination => {
termination = true;
yield_timer = None;
drop(command_rx.take());
begin_termination(
&runtime_tx,
&runtime_control_tx,
&runtime_terminate_handle,
&cancellation_token,
);
if runtime_closed {
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::Cancel,
task_failure_handler.as_ref(),
).await;
finish_termination(
&cell_state,
observer.take().map(|observer| observer.response_tx),
CellEvent::Terminated {
content_items: std::mem::take(&mut content_items),
},
);
break;
}
}
maybe_command = async {
match command_rx.as_mut() {
Some(command_rx) => command_rx.recv().await,
None => std::future::pending::<Option<CellCommand>>().await,
}
} => {
let Some(CellCommand::Observe { mode, response_tx }) = maybe_command else {
cancellation_token.cancel();
continue;
};
if response_tx.is_closed() {
continue;
}
let response_tx = match cell_state.route_observation(mode, response_tx) {
ObservationDelivery::Running(response_tx) => response_tx,
ObservationDelivery::Delivered => break,
ObservationDelivery::Buffered | ObservationDelivery::Closed => continue,
};
if observer
.as_ref()
.is_some_and(|observer| observer.response_tx.is_closed())
{
observer = None;
yield_timer = None;
}
if observer.is_some() || termination {
let _ = response_tx.send(Err(CellError::Busy));
continue;
}
if matches!(mode, ObserveMode::PendingFrontier) && pending_frontier_ready {
pending_frontier_ready = false;
match send_cell_event(
response_tx,
CellEvent::Pending {
content_items: std::mem::take(&mut content_items),
pending_tool_call_ids: std::mem::take(&mut pending_tool_call_ids),
},
) {
Ok(()) => {}
Err(CellEvent::Pending {
content_items: undelivered_items,
pending_tool_call_ids: undelivered_tool_call_ids,
}) => {
content_items = undelivered_items;
pending_tool_call_ids = undelivered_tool_call_ids;
pending_frontier_ready = true;
}
Err(event) => {
panic!("pending delivery returned an unexpected event: {event:?}")
}
}
continue;
}
observer = Some(Observer { mode, response_tx });
yield_timer = observer.as_ref().and_then(observer_timer);
if runtime_paused && matches!(mode, ObserveMode::YieldAfter(_)) {
pending_frontier_ready = false;
pending_tool_call_ids.clear();
}
resume_for_observation(
mode,
&mut runtime_paused,
&runtime_tx,
&runtime_control_tx,
);
}
_ = async {
if let Some(yield_timer) = yield_timer.as_mut() {
yield_timer.await;
} else {
std::future::pending::<()>().await;
}
} => {
yield_timer = None;
restore_undelivered_yield(
send_observer_event(
observer.take(),
CellEvent::Yielded {
content_items: std::mem::take(&mut content_items),
},
),
&mut content_items,
);
}
maybe_event = async {
if runtime_closed {
std::future::pending::<Option<RuntimeEvent>>().await
} else {
event_rx.recv().await
}
}, if !yield_deadline_elapsed => {
let Some(event) = maybe_event else {
runtime_closed = true;
if termination || cancellation_token.is_cancelled() {
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::Cancel,
task_failure_handler.as_ref(),
).await;
finish_termination(
&cell_state,
observer.take().map(|observer| observer.response_tx),
CellEvent::Terminated {
content_items: std::mem::take(&mut content_items),
},
);
break;
}
if !runtime_failure_reported
&& let Some(task_failure_handler) = &task_failure_handler
{
runtime_failure_reported = true;
task_failure_handler(
"code-mode V8 runtime thread ended unexpectedly".to_string(),
);
}
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::DrainNotifications,
task_failure_handler.as_ref(),
)
.await;
let event = CellEvent::Completed {
content_items: std::mem::take(&mut content_items),
error_text: Some("exec runtime ended unexpectedly".to_string()),
};
let rejected_event = match host
.commit_completion(
HashMap::new(),
event,
/*pending_initial_yield_items*/ None,
Arc::clone(&cell_state),
)
.await
{
CompletionCommit::Committed => None,
CompletionCommit::Rejected(event) => Some(event),
};
match cell_state.deliver_completion(
observer.take().map(|observer| observer.response_tx),
) {
CompletionDelivery::Delivered => break,
CompletionDelivery::Buffered => {}
CompletionDelivery::Rejected(response_tx) => {
finish_termination(
&cell_state,
response_tx,
CellEvent::Terminated {
content_items: rejected_completion_content(rejected_event),
},
);
break;
}
}
continue;
};
match event {
RuntimeEvent::Started => {
yield_timer = observer.as_ref().and_then(observer_timer);
}
RuntimeEvent::Pending => {
runtime_paused = true;
if matches!(
observer.as_ref().map(|observer| observer.mode),
Some(ObserveMode::PendingFrontier)
) {
yield_timer = None;
pending_frontier_ready = false;
match send_observer_event(
observer.take(),
CellEvent::Pending {
content_items: std::mem::take(&mut content_items),
pending_tool_call_ids: std::mem::take(
&mut pending_tool_call_ids,
),
},
) {
Ok(()) => {}
Err(CellEvent::Pending {
content_items: undelivered_items,
pending_tool_call_ids: undelivered_tool_call_ids,
}) => {
content_items = undelivered_items;
pending_tool_call_ids = undelivered_tool_call_ids;
pending_frontier_ready = true;
}
Err(event) => {
panic!("pending delivery returned an unexpected event: {event:?}")
}
}
} else {
pending_tool_call_ids.clear();
let _ = runtime_control_tx.send(RuntimeControlCommand::Continue);
runtime_paused = false;
}
}
RuntimeEvent::ContentItem(item) => content_items.push(output_item(item)),
RuntimeEvent::YieldRequested => {
let yield_observer = matches!(
observer.as_ref().map(|observer| observer.mode),
Some(ObserveMode::YieldAfter(_))
);
if yield_observer {
yield_timer = None;
restore_undelivered_yield(
send_observer_event(
observer.take(),
CellEvent::Yielded {
content_items: std::mem::take(&mut content_items),
},
),
&mut content_items,
);
}
}
RuntimeEvent::Notify { call_id, text } => {
spawn_notification(
&mut notification_tasks,
Arc::clone(&host),
call_id,
text,
callback_cancellation_token.child_token(),
task_failure_handler.clone(),
);
}
RuntimeEvent::ToolCall { id, name, kind, input } => {
pending_tool_call_ids.push(id.clone());
spawn_tool(
&mut tool_tasks,
Arc::clone(&host),
CellToolCall {
id,
name: CellToolName {
name: name.name,
namespace: name.namespace,
},
kind: cell_tool_kind(kind),
input,
},
runtime_tx.clone(),
callback_cancellation_token.child_token(),
task_failure_handler.clone(),
);
}
RuntimeEvent::Result { stored_value_writes, error_text } => {
runtime_closed = true;
yield_timer = None;
if termination || cancellation_token.is_cancelled() {
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::Cancel,
task_failure_handler.as_ref(),
).await;
finish_termination(
&cell_state,
observer.take().map(|observer| observer.response_tx),
CellEvent::Terminated {
content_items: std::mem::take(&mut content_items),
},
);
break;
}
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::DrainNotifications,
task_failure_handler.as_ref(),
)
.await;
let event = CellEvent::Completed {
content_items: std::mem::take(&mut content_items),
error_text,
};
let rejected_event = match host
.commit_completion(
stored_value_writes,
event,
/*pending_initial_yield_items*/ None,
Arc::clone(&cell_state),
)
.await
{
CompletionCommit::Committed => None,
CompletionCommit::Rejected(event) => Some(event),
};
match cell_state.deliver_completion(
observer.take().map(|observer| observer.response_tx),
) {
CompletionDelivery::Delivered => break,
CompletionDelivery::Buffered => {}
CompletionDelivery::Rejected(response_tx) => {
finish_termination(
&cell_state,
response_tx,
CellEvent::Terminated {
content_items: rejected_completion_content(rejected_event),
},
);
break;
}
}
}
RuntimeEvent::ThreadPanicked => {
runtime_failure_reported = true;
}
}
}
task_result = notification_tasks.join_next(), if !notification_tasks.is_empty() => {
report_task_result(
task_result,
"notification",
task_failure_handler.as_ref(),
);
}
task_result = tool_tasks.join_next(), if !tool_tasks.is_empty() => {
report_task_result(task_result, "tool", task_failure_handler.as_ref());
}
}
}
// Reject requests that arrive while asynchronous terminal cleanup runs.
cell_state.tombstone();
drop(command_rx.take());
begin_termination(
&runtime_tx,
&runtime_control_tx,
&runtime_terminate_handle,
&cancellation_token,
);
finish_callbacks(
&callback_cancellation_token,
&mut notification_tasks,
&mut tool_tasks,
CallbackCompletion::Cancel,
task_failure_handler.as_ref(),
)
.await;
host.closed().await;
}
fn send_observer_event(observer: Option<Observer>, event: CellEvent) -> Result<(), CellEvent> {
let Some(observer) = observer else {
return Err(event);
};
send_cell_event(observer.response_tx, event)
}
fn send_cell_event(
response_tx: oneshot::Sender<Result<CellEvent, CellError>>,
event: CellEvent,
) -> Result<(), CellEvent> {
match response_tx.send(Ok(event)) {
Ok(()) => Ok(()),
Err(Ok(event)) => Err(event),
Err(Err(error)) => panic!("cell event delivery returned an actor error: {error:?}"),
}
}
fn restore_undelivered_yield(delivery: Result<(), CellEvent>, content_items: &mut Vec<OutputItem>) {
match delivery {
Ok(()) => {}
Err(CellEvent::Yielded {
content_items: mut undelivered_items,
}) => {
undelivered_items.append(content_items);
*content_items = undelivered_items;
}
Err(event) => panic!("yield delivery returned an unexpected event: {event:?}"),
}
}
fn rejected_completion_content(event: Option<CellEvent>) -> Vec<OutputItem> {
match event {
Some(CellEvent::Completed { content_items, .. }) => content_items,
None => Vec::new(),
Some(event) => panic!("completion commit rejected an unexpected event: {event:?}"),
}
}
fn finish_termination(
cell_state: &CellState,
observer_tx: Option<oneshot::Sender<Result<CellEvent, CellError>>>,
event: CellEvent,
) {
if let Some(event) = cell_state.finish_termination(event)
&& let Some(observer_tx) = observer_tx
{
let _ = observer_tx.send(Ok(event));
}
}
fn observer_timer(observer: &Observer) -> Option<std::pin::Pin<Box<tokio::time::Sleep>>> {
match observer.mode {
ObserveMode::YieldAfter(duration) => Some(Box::pin(tokio::time::sleep(duration))),
ObserveMode::PendingFrontier => None,
}
}
fn resume_for_observation(
mode: ObserveMode,
runtime_paused: &mut bool,
runtime_tx: &std::sync::mpsc::Sender<RuntimeCommand>,
runtime_control_tx: &std::sync::mpsc::Sender<RuntimeControlCommand>,
) {
if *runtime_paused {
let control = match mode {
ObserveMode::YieldAfter(_) => RuntimeControlCommand::Continue,
ObserveMode::PendingFrontier => RuntimeControlCommand::Resume,
};
let _ = runtime_control_tx.send(control);
*runtime_paused = false;
} else if matches!(mode, ObserveMode::PendingFrontier) {
let _ = runtime_tx.send(RuntimeCommand::ObservePendingFrontier);
}
}
fn begin_termination(
runtime_tx: &std::sync::mpsc::Sender<RuntimeCommand>,
runtime_control_tx: &std::sync::mpsc::Sender<RuntimeControlCommand>,
runtime_terminate_handle: &v8::IsolateHandle,
cancellation_token: &CancellationToken,
) {
cancellation_token.cancel();
let _ = runtime_tx.send(RuntimeCommand::Terminate);
let _ = runtime_control_tx.send(RuntimeControlCommand::Terminate);
let _ = runtime_terminate_handle.terminate_execution();
}
#[cfg(test)]
#[path = "tests.rs"]
mod tests;
|